Abstract: A lighting fixture includes a lighting device, a motion sensor, and a wireless transceiver configured to transmit and receive wireless signals. The lighting fixture further includes a controller communicably coupled to the lighting device, to the motion sensor, and to the transceiver. The controller is configured to adjust a light provided by the lighting device based on a motion detection by the motion sensor and based on a wireless input signal received by the transceiver indicating whether a second motion is detected by a second lighting fixture.

Abstract: A system and method for counting persons using passages entering or exiting an area by analyzing vibrations in the floor with sensors and a machine learning system. The machine learning system uses a model, usually implemented as a neural network on a processor. The network is trained in levels and implemented in layers. Different levels classify and analyze vibrations by timing and frequency, by movements of persons, and by identity of persons The same person is identified by patterns in the vibrations and the vibrations are correlated to determine when a person uses a combination of passages and is thereby counted. Location information for the person is used to identify persons in places and doing activities of interest. The model may be trained on one processor and then downloaded to another processor for evaluation. Additional sensors and levels of training may be implemented on the latter processor.

Abstract: An anti-masking device for an intrusion detector and method for detecting a masking substance is disclosed. The device can comprise a cover enclosing an interior area housing an electric light source and a light detecting sensor. The cover can have a light-permeable area having an exterior surface with a jagged array including a plurality of parallel spaced-apart teeth forming a series of alternating channels and projections. A light guide can be provided with opposing first and second ends. The first end can be located within the interior area adjacent the light source and the second end can be located adjacent the exterior surface of the cover. The light guide can be configured to direct light outside the cover and onto the jagged array. The jagged area can be configured to refract light from the light guide through the cover and into the interior.

Abstract: A smart window-based security system is provided. The system includes a plurality of smart windows, each smart window of the plurality of smart windows having at least one electrochromic window and at least one sensor integrated into the smart window. The plurality of smart windows are coupled together in a system having at least one processor configured to detect a personal or property security threat, such as an intruder or fire based, on information from sensors of the plurality of smart windows.

Abstract: Systems and methods for adjusting a focal length of a mirror are provided. Some systems can include an adjustment device having an slot, a mirror that is rotatable about an axis, and a drive coupled to the mirror and configured to engage the slot, wherein movement of the adjustment device can cause the drive to move within the slot upwards or downwards in accordance with a slope of the slot, thereby rotating the mirror about the axis.

Abstract: Systems, devices, and methods for identifying an individual in both cooperative and non-cooperative situations are provided. In one aspect, for example, a system for identifying an individual can include an active light source capable of emitting electromagnetic radiation having at least one wavelength of from about 700 nm to about 1200 nm, and an imager device positioned to receive the electromagnetic radiation upon reflection from an individual to generate an electronic representation of the individual. The system can also include an image processing module functionally coupled to the imager device to receive the electronic representation. The image processing module processes the electronic representation into an individual representation having at least one substantially unique identification trait.

Abstract: According to the invention, a PIR sensor system (100) comprises a first PIR sensor (1) associated with a first sensing region (11) and a second PIR sensor (2) associated with a second sensing region (12). The first and second sensing regions partially overlap and are divided into detection cells (46a-46f) and (45a-45d). Each detection cell is represented by predetermined characteristics of first and second output signals, which signals are based on input signals from first and second sensing elements (4-7) of each PIR sensor. Thereby different detection cells are encoded by a certain combination of signal characteristics (amplitude and sign) of the first and second output signals. Further, the PIR sensor system comprises a processing unit (15) configured to associate the characteristics of the first and second output signals with one of the detection cells for determining in which of the detection cells a heat source is positioned.

Abstract: A security system uses wireless access control readers that determine locations of beacon devices relative to thresholds of access points, a verification system for validating user information for users, and beacon devices that monitor for an activation input from their users and that signal the wireless access control readers when the activation input is received. The access point is then controlled based on the user information and the receipt of the activation input by the beacon devices. This addresses the problem of how the system infers intent at an access point. The security system no longer has to infer intent from possibly poor information concerning the location and movement of the users. Instead, the security system can simply determine gross proximity to the access point and then wait for the activation input.

Abstract: A system and method for securing an edge zone in a space, while not restricting normal activities in the space, is provided. The system and method comprises an infrared detection device and a data processing means. The infrared detection device monitors a space using two or more fields of view. Some of the fields of view cover an edge zone of the space, while the rest of the fields of view cover an adjacent zone to the edge zone. The infrared detection device produces a signal when one or more infrared sources, such as human beings, enter one of its fields of view, in which the signal is unique for identifying the field of view being entered. The data processing means processes the signals from the infrared detection device for securing the edge zone with either intrusion detection or escape detection. The data processing means produces an alarm signal when an intrusion or escape is detected, but does not produce such a signal for normal activities in the monitored space, including the edge zone.

Abstract: An optical element has a first surface and a second surface opposite the first surface. The first surface is subdivided into at least one first segment and a second segment. The segments in each case adjoin a midpoint of the first surface. Each segment has a tooth structure having teeth extending along tooth extension directions. The tooth extension directions have bends at boundaries between the segments.

Abstract: A passive infrared motion detection sensor that includes a Fresnel focusing arrangement that creates at least a first infrared sensing region, a second infrared sensing region, and a third infrared sensing region, in which target detection in one or more infrared sensing regions is weighted to be distinguishable from target detection in remaining infrared sensing regions. The Fresnel focusing arrangement creates the weighted infrared sensing regions using a lenslet region, an optically opaque region and a plurality of extruded cylindrical lenslets that extend across a portion of both the lenslet region and the optically opaque region. The signal detection in at least the second weighted infrared sensing region, for example, an infrared sensing range between 6 and 10 feet, is weighted to easily distinguish between a pet within the second infrared sensing range and a person at any infrared sensing range.

Abstract: A battery pack includes a battery, main switch, controller, and driving voltage supply source. The battery has at least one battery cell. The main switch is connected between a first node and a second node, the battery is connected to the first node and an external terminal, and the external terminal connected to the second node. The controller manages the battery and to control the main switch. The driving voltage supply source generates a driving voltage based on a voltage of a third node and to supply the driving voltage to the controller. The third node is diode-connected to the first node and the second node.

Abstract: A laser detector includes a latch and a semiconductor device including the same. The laser detector includes a latch configured to output an output signal and an inverted output signal and an initial value setting circuit configured to set an initial value of at least one of the output signal and the inverted output signal. The latch includes a first transistor controlled to be initially turned on by the initial value and a second transistor controlled to be initially turned off by the initial value. The second transistor has an active region having a lateral area that is greater than that of the first transistor.

Abstract: A system and method for counting persons using passages entering or exiting an area by analyzing vibrations in the floor with sensors and a machine learning system. The machine learning system uses a model, usually implemented as a neural network on a processor. The network is trained in levels and implemented in layers. Different levels classify and analyze vibrations by timing and frequency, by movements of persons, and by identity of persons The same person is identified by patterns in the vibrations and the vibrations are correlated to determine when a person uses a combination of passages and is thereby counted. Location information for the person is used to identify persons in places and doing activities of interest. The model may be trained on one processor and then downloaded to another processor for evaluation. Additional sensors and levels of training may be implemented on the latter processor.

Abstract: A motion sensor has at least two tiers of monitored volumes that are offset from each other. Electromagnetic radiation, such as infrared light, is directed from the monitored volumes onto at least two sets of detector elements having separate outputs on a pyroelectric substrate of an infrared detector. As a warm object, such as a human or an animal, moves through the monitored volumes, the warmth from the object causes the voltage on the outputs of the infrared detector to change. The resultant waveforms are compared and if the two waveforms have a phase relationship corresponding to a critical phase angle that is based on the pitch of the monitored volumes and the offset between the tiers of monitored volumes, an animal-immune motion indication is generated.

Abstract: An optical scanner includes a light source located within a housing. A reticle having an aperture is positioned within the housing to receive a first light beam emitted from the light source. The reticle is configured to transmit a second light beam through the aperture. A mirror is positioned within the housing to receive the second light beam transmitted from the reticle and reflect the second light beam through a first window in the housing onto a surface of interest of an object. A light receiver is configured to receive a third light beam from the surface of interest of the object through a second window in the housing, wherein the light receiver is configured to obtain one or more light position values to determine a parameter of the surface of interest of the object. Methods for generating three-dimensional images of an object utilizing the optical scanner are also disclosed.

Abstract: To ensure that guest abnormal behavior can be easily found by visual inspection. A security system includes a staff electronic name tag device (SENTD), a guest electronic name tag device (GENTD), a monitoring device, a guest management device, and a gate device. The SENTD displays the face image of the staff who is assigned with the SENTD. The GENTD includes a display unit and a first wireless communication unit. The display unit displays the face image of the guest to which the GENTD is assigned. The photographing unit photographs the face image of the guest in the facility and outside the monitoring area. The second wireless communication unit wirelessly communicates with the first wireless communication unit of the guest electronic tag unit. The holder registration unit transmits the photographed face image of the guest to the GENTD in the second wireless communication unit for display.

Abstract: It is an object to provide an electromagnetic wave measuring apparatus and an electromagnetic wave measuring method that suppress deterioration in sensitivity of electromagnetic noise in electromagnetic wave measurement. An electromagnetic wave measuring apparatus includes a sensor that detects an electromagnetic wave and outputs a detection signal having intensity corresponding to the magnitude of energy of the detected electromagnetic wave, a resistor connected to the sensor, a first variable capacitor connected to the sensor, a voltage detection circuit connected to the sensor, a second variable capacitor connected to a wire between the sensor and the voltage detection circuit, and a capacitance adjusting unit that adjusts capacitance values of the first variable capacitor and the second variable capacitor. The electromagnetic wave measuring apparatus adjusts, in the adjusting unit, the capacitance values of the first and second variable capacitors and performs electromagnetic wave measurement.

Abstract: A sensor control device which controls: a first sensor which detects, based on a captured image, whether a person is present in a first detection range, and detects, for each of regions into which the first detection range is divided, whether a person is present in the region, based on a captured image; and a plurality of second sensors which detect, based on infrared radiation, whether a person is present in respective second detection ranges includes a determiner which matches, for each of the regions, an on or off state of a detection function of the first sensor in the region with an on or off state of a detection function of a second sensor whose second detection range overlaps the region, among the plurality of second sensors, by controlling the first sensor and the plurality of second sensors.

Abstract: Various systems and methods are disclosed for monitoring and controlling using small infrared imaging modules to enhance occupant safety and energy efficiency of buildings and structures. In one example, thermal images captured by infrared imaging modules may be analyzed to detect presence of persons, identify and classify power-consuming objects, and monitor environmental conditions. Based on the processed thermal images, various power-consuming objects (e.g., an HVAC system, lighting, a water heater, and other appliances) may be controlled to increase energy efficiency. In another example, thermal images captured by infrared imaging modules may be analyzed to detect various hazardous conditions, such as a combustible gas leak, a CO gas leak, a water leak, fire, smoke, and, an electrical hotspot. If such hazardous conditions are detected, an appropriate warning may be generated and/or various objects may be controlled to remedy the conditions.

Abstract: In flight vehicles subject to extreme aero-thermal heating of the optical window, the optical system is configured to look through an off-axis segment of the optical window and a polarizer is positioned in the optical path between the off-axis segment and the detector. The polarizer comprises at least one filter pixel that imparts a linear polarization of a certain angular value to filter the incident radiation as a function of its polarization. In the case of a sheet polarizer, the entire polarizer is aligned to the plane of incidence. The sheet polarizer preferentially filters the target radiation to increase the SNR at the detector. In the case of a microgrid polarizer, at least one and preferably multiple filter pixels in each sub-array aligned to the plane of incidence. The microgrid polarizer can produce data products including a radiance image, an AoLP image and a DoLP image, only the AoLP image removes the self-emitted window radiance and an gradient caused by non-uniform aero-thermal heating.

Abstract: A meter reading system for communicating with Automated Meter Reading meters. The system includes an airborne platform and a meter data collection system disposed on the airborne platform. The meter data collection system includes antennas, with each of the antennas pointing in a different direction, one from another, and each antenna generally pointing downward when the airborne platform is airborne. The antennas receive meter data from the meters. The meter data collection system also includes transceivers, one each of the transceivers associated with and in signal communication with one each of the antennas. The transceivers receive the meter data through the antennas. A first computer is in signal communication with the transceivers, and receives the meter data from the transceivers.

Abstract: A system and associated methods of operation for regulating an environmental variable (such as ambient room temperature) within a target zone. The system includes a sensor system configured to monitor the target zone, detect one or more inhabitants present within the zone, and identify an alpha person from the one or more inhabitants. Once the alpha person is identified, a measurement sensor measures a skin parameter from the identified alpha person and generates a sensor signal communicating the measured skin parameter to an environmental control system. Upon receiving the sensor signal, the environmental control system regulates an environmental variable within the zone based on the measured skin parameter from the alpha person.

Abstract: A system is provided that includes a security system that protects a secured area, a passive infrared (PIR) detector of the security system that detects intruders within the secured area, a pyroelectric element carried by the PIR detector, the pyroelectric element being tilted downwards towards a floor within the secured area to receive and detect a predominant portion of energy from an area extending outwards from the PIR detector and directly in front of the PIR detector and a relatively small portion of energy from a floor area directly below the PIR detector, and a pivoting door having first and second positions mounted below and directly adjacent the pyroelectric element, the door pivoting upwards to the first position where the relatively small portion of energy is blocked and pivoting downwards where the relatively small portion of energy is transmitted onto the pyroelectric element.

Abstract: Methods of fabricating tamper-respondent assemblies are provided which include an electronic enclosure, a tamper-respondent electronic circuit structure, and at least one security element. The electronic enclosure encloses, at least in part, at least one electronic component to be protected, and includes an inner surface. The tamper-respondent electronic circuit structure includes a tamper-respondent sensor covering, at least in part, the inner surface of the electronic enclosure, and the at least one security element overlies and physically secures in place, at least in part, the tamper-respondent sensor covering, at least in part, the inner surface of the electronic enclosure.

Abstract: A method for geo-location services is described. In one embodiment, the method includes monitoring a condition of a user at a location, identifying an emergency situation in relation to the user at the location, and upon identifying the emergency situation, sending a notification message to a predetermined contact, the notification message comprising a temporary code to unlock a door lock at the location within a predetermined time period.

Abstract: The invention relates to an apparatus comprising an electromechanical device, a control unit, a main control unit and a motion detector, wherein said control unit is configured to control said electromechanical device. The invention also relates to a method for operating an apparatus with a main control unit, a control unit and an electromechanical device. The technical problem of providing an apparatus with an electromechanical device, the reliability of which is improved, is solved by an apparatus wherein the main control unit is configured to provide information to the control unit. The motion detector and the main control unit are configured such that information about the movement of the electromechanical device is provided by the motion detector at least to the main control unit. The technical problem is also solved by a method for operating an apparatus, in particular an apparatus or medical device according to the invention.

Abstract: A human detection system includes a thermal sensor and an indoor apparatus. The thermal sensor captures a thermal image of an indoor space. The human detection system includes a human entering detection mode, a first human exiting detection mode corresponding to a state of turning off the indoor apparatus and a second human exiting detection mode corresponding to a state of turning on the indoor apparatus, wherein the human detection system executes a human entering detection procedure according to the thermal image under the first human entering detection mode, and executes a human exiting detection procedure according to the thermal image under the first human exiting detection mode or the second human exiting detection mode.

Abstract: An omnidirectional lens is disclosed of the type which captures light from virtually all angles of incidence, and also emits light in all directions. Embodiments are specifically disclosed as a two-way lens that receives light beams from all directions of the compass and directs those light beams to a photosensor. The same two-way lens acts in a “beacon mode” to produce light beams from one or more LEDs, and to emit such light beams (again) in all directions of the compass. The emitted light beams can also be used to signal various functions as visible signals to users on a jobsite.

Abstract: The present invention is directed, in part, to a receiver for an infrared light source. The receiver comprises a substantially transparent body; a sensor for receiving infrared light; and a substantially planar first surface on the transparent body. The first surface is configured to direct light from the infrared light source to the sensor. The substantially planar first surface comprises the end of the substantially transparent body. The substantially planar first surface provides an internally reflective surface that directs light into the interior of the substantially transparent body so it will make contact with the sensor.

Abstract: A system for nondestructive evaluation of railroad rails, includes a carriage including a plurality of wheels movably supporting the carriage on the rails, a source of vibration mounted on the carriage and connected to transmit vibrations of a preselected frequency to test regions on the rails through the wheels to cause an increase in temperature of the rails at locations of flaws in the test regions, an infrared detector for recording thermal images of the test regions to detect the increase in temperature of the location of the flaws, a controller connected to actuate the infrared detector to record the thermal images of the vibrations impacting the test regions, and store the thermal images recorded by the infrared detector.

Abstract: The present invention provides an improved method and apparatus to collect and provide viewer feedback to broadcasts. According to one aspect of the present invention, a rating is generated for a broadcast by a server system. The rating is based at least in part on viewer feedback to the broadcast, and the rating indicates a likelihood of interest in the broadcast for potential subsequent viewers. According to another aspect of the present invention, the rating is provided from the server system to an entertainment system, and the broadcast can be selected for viewing at an entertainment system. In one embodiment, the viewer feedback is received at the entertainment system in response to a feedback questionnaire.

Abstract: Power management circuitry initiates storage of backup energy in an energy storage resource. The backup energy is stored to power an electronic circuitry during a power failure condition in which primary power is unavailable to power the electronic circuit. During a test mode, the power management circuitry selectively discharges the backup energy stored in the energy storage resource at multiple different energy discharge rates to test the energy storage resource.

Abstract: Devices, methods, systems, and computer-readable media for a multiband detector are described herein. One or more embodiments include a multiband detector designed to detect an emission source including a broadband lens, a broadband detector, and a filter that allows electromagnetic radiation entering the system to be filtered into at least two wavelength bands before contacting the broadband detector wherein one or more wavelength bands are used to determine system functionality and wherein one or more other wavelength bands are used to identify the presence of an emission source having a characteristic particular wavelength or wavelength range.

Abstract: A system for distinguishing a first group of persons from a second group of persons among plural persons who are present inside an area, and the system includes processing circuitry that: detects first positions of the plural persons who are present inside the area based on a heat image; detects second positions of the second group of persons who are present inside the area based on identification signals transmitted from portable wireless terminals of the second group of persons; and determines, as the first group of persons, those who are present at positions different from the second positions based on the first and second positions.

Abstract: A system for detecting and tracking motion in a given area, including a first passive motion detection sensor operable for passively detecting motion in any of a first multiplicity of detection zones and, responsive thereto, for providing a first detection output signal including an indication of a first detection zone in which the motion was detected, a second passive motion detection sensor operable for passively detecting motion in any of a second multiplicity of detection zones, each of the second multiplicity of detection zones at least partially overlapping each of the first multiplicity of detection zones, and, responsive thereto, for providing a second detection output signal including an indication of a second detection zone in which the motion was detected, and a processor operable for receiving the first and second detection output signals and, responsive thereto, for providing an indication of a location of the motion.

Abstract: A passive infra red detector comprises a plurality of passive infra red sensors (4, 5) and a lens member (2) arranged to direct radiation from a target area onto the sensors. The lens member (2) forms a substantially hemispherical dome about the infra red sensors (4, 5). The dome has a central axis and a plurality of contiguous facets (2a-2g) distributed about the central axis. Each facet has a flat outer surface and an inner surface that forms a lens to direct radiation onto the sensors. The detector further comprises a first passive infra red sensor (4) aligned with the central axis of the dome and having a sensitive surface substantially normal to the central axis, and a plurality of second passive infra red sensors (5) distributed about the central axis of the dome. The second passive infra red sensors (5) are inclined such that the outward normal from the sensitive surface of each second passive infra red sensor (5) makes an acute angle with the outward direction of the central axis.

Abstract: A measurement object surface is illuminated with a pattern sequence of various patterns using a projector, which is recorded with a camera system, and the 3D coordinates for the measurement points are determined by evaluation of the image sequence. While the image sequence is being recorded translational and/or rotational accelerations of the projector, the camera system and/or the measurement object are measured at least at a measurement rate such that in each case a plurality of values for the accelerations are acquired. It is thus possible, on the basis of the measured accelerations, to take into account algorithmically, when determining the 3D coordinates, movements of the projector, the camera system and/or the measurement object, which movements occur during the illumination times of the respective individual images of the image sequence and provoke unsteadiness and/or motion blur in the respective individual images of the image sequence.

Abstract: Compact thermal sensor modules, which in some implementations can be manufactured in wafer-level fabrication processes, include features composed of or coated with a low-emissivity material to reduce or prevent detection by a sensor of radiation emitted by other parts of the module. For example, spacers that separate an optics substrate and a sensor package from one another can be composed of or coated with such a low emissivity material. In some cases, the low emissivity material has an emissivity of no more than 0.1.

Abstract: A MEMS optical device and an array composed thereof are disclosed herein, wherein the MEMS optical device comprises a light absorbing element, a deforming element, and a magnetic detector, wherein the magnetic detector comprises a magnetic source and a magnetic sensor.

Abstract: An arrangement for implementing an outdoor light enabling motion detection is disclosed. The arrangement comprises a motion detector associated with the outdoor light; and a user interface, separate from the outdoor light, accessible by a user; wherein the user interface enables the operation of the motion detector in a first mode and overrides the operation of the motion detector in a second mode.

Abstract: Methods of processing molten material comprising the step (I) of flowing molten material through an interior of a conduit from a first station to a second station of a glass manufacturing apparatus and the step (II) of cooling the molten material within the interior of the conduit by passing a cooling fluid along an exterior of the conduit. The method further includes the step (III) of directing a travel path of the cooling fluid toward a vertical plane passing through the conduit. In further examples, a glass manufacturing apparatus comprises a first station, a second station, and a conduit configured to provide a travel path for molten material traveling from the first station to the second station. The glass manufacturing apparatus further comprises at least one baffle configured to direct a travel path of cooling fluid toward a vertical plane passing through the conduit.

Abstract: A building comprising a plurality of rooms (10) includes a room occupancy sensing apparatus. A light source (20) emits a series of light pulses (22), a plurality of waveguides deliver light from the light source to output nodes (60) located in the rooms, and a signal capture unit (30) receives output signals resulting from light reflected by objects in the rooms. The apparatus detects movement, of for example a person (40), in a room and ascertains the room concerned by virtue of (i) detecting a difference between the shape of the waveform of the signal (24 i) received at the signal capture unit (30) in response to a first emitted light pulse and the shape of the waveform of the signal (24m) received at the signal capture unit in response to a second emitted light pulse and (ii) relating said reflected light pulses to the appropriate output node and therefore to the room (10) associated with that output node (60).

Abstract: Tamper-respondent assemblies and methods of fabrication are provided which include an electronic enclosure, a tamper-respondent electronic circuit structure, and at least one security element. The electronic enclosure encloses, at least in part, at least one electronic component to be protected, and includes an inner surface. The tamper-respondent electronic circuit structure includes a tamper-respondent sensor covering, at least in part, the inner surface of the electronic enclosure, and the at least one security element overlies and physically secures in place, at least in part, the tamper-respondent sensor covering, at least in part, the inner surface of the electronic enclosure.

Abstract: A passive infrared motion detection sensor that includes a Fresnel focusing arrangement that creates at least a first infrared sensing region, a second infrared sensing region, and a third infrared sensing region, in which target detection in one or more infrared sensing regions is weighted to be distinguishable from target detection in remaining infrared sensing regions. The Fresnel focusing arrangement creates the weighted infrared sensing regions using a lenslet region, an optically opaque region and a plurality of extruded cylindrical lenslets that extend across a portion of both the lenslet region and the optically opaque region. The signal detection in at least the second weighted infrared sensing region, for example, an infrared sensing range between 6 and 10 feet, is weighted to easily distinguish between a pet within the second infrared sensing range and a person at any infrared sensing range.

Abstract: Methods and systems are described for monitoring a monitored space. An example computer-implemented method for monitoring a monitored space includes periodically emitting with an active infrared sensor a modulated infrared signal into a monitored space being monitored by a home automation system, receiving with the active infrared sensor the modulated infrared signals reflected from objects in the monitored space, and determining at least one of whether a number of objects in the monitored space have changed and whether any of the objects are moving.

Abstract: Method, computer storage device, and system that establish communication with at least first and second sensors, receive information from the sensors, and determine whether the information from the first sensor satisfies a first alert threshold. It is also determined whether the information from the second sensor satisfies a second alert threshold. Responsive to a determination that the information from the first sensor satisfies the first alert threshold and that the information from the second sensor does not satisfy the second alert threshold, an alert signal is not generated. On the other hand, responsive to a determination that the information from the first sensor satisfies the first alert threshold and that the information from the second sensor satisfies the second alert threshold, the alert signal is generated for output thereof to a display device.

Abstract: A Fresnel lens and a pyroelectricity sensor module are provided. The Fresnel lens includes unit lens groups having different refractive indexes, and each of the unit lens groups includes unit lenses. Between two unit lenses of the same unit lens group at least one unit lens included in a different lens group is arranged. The pyroelectricity sensor module includes a Fresnel lens which condenses infrared light; a detecting sensor disposed to receive the condensed infrared light and detect the infrared light; and a signal processing board on which the detecting sensor is mounted and configured to control an output signal of the detecting sensor. The Fresnel lens includes unit lens groups having different refractive indexes, and each of the unit lens groups includes unit lenses, and between two unit lenses of the same unit lens group, at least one unit lens included in a different lens group is arranged.

Abstract: The present invention is directed, in part, to a receiver for an infrared light source. The receiver comprises a substantially transparent body; a sensor for receiving infrared light; and a substantially planar first surface on the transparent body. The first surface is configured to direct light from the infrared light source to the sensor. The substantially planar first surface comprises the end of the substantially transparent body. The substantially planar first surface provides an internally reflective surface that directs light into the interior of the substantially transparent body so it will make contact with the sensor.

Abstract: A security device is disclosed, wherein the security device includes a Fresnel lens covering the entire face of the device, a housing, and a pyroelectric detector. The center portion of the Fresnel lens, which contains the Fresnel lens elements, is molded flat, its edges are molded in the final installed form, and its edges contain appendages that secure the lens on the device so there are no gaps between the lens and the device.