Abstract: A movement detector for detecting movement of a body includes a light sensor, a kaleidoscopic mirror and a lens for projecting a multiple image of the space onto the sensor. The movement detector is very sensitive and has a very small diameter.

Abstract: To provide an anti-thief security sensor assembly wherein an optical axis adjustment of a beam projector can be accurately achieved merely by physically opening a cover of a beam projecting unit while a cover of a beam receiving unit is not opened physically, the anti-thief security sensor assembly includes a beam projecting unit (1) for emitting an infrared beam IR and having a projector cover (21A) mounted on a projector base (20A) so as to cover and protect a sensor circuit. This beam projecting unit (1) includes an opening detecting switch (7) for detecting the physical opening of the projector cover (21A) and a transmission request generating circuit (8) operable in response to the detection by the opening detecting switch (7) to output a received beam level transmission request signal B to the beam receiving unit (2).

Abstract: A pest deterrent device attracts the attention of a pest with ultrasonic noise and then produces a series of flashes to drive off the pest. In one embodiment, the device continuously produces ultrasound, changing the ultrasound when a pest is detected. In another embodiment, the device does not produce ultrasound until a pest is detected. In a further embodiment, the flash charging circuit is used to modulate the ultrasound while the flash is operated. In a particular embodiment, four ultrasonic speakers are arranged in a series-parallel configuration with a total capacitance of about 0.2 micro-Farads achieve 120 dB of sound output with a supply voltage of about 12-18 V.

Abstract: A warning system comprises a piezo-electric ceramic capable of resonating with an ultrasonic wave having a frequency within a predetermined frequency band and thus outputting an electric signal, a resonator capable of detecting only a signal component having a specific frequency from the electric signal output from the piezo-electric ceramic. When the resonator has detected a signal component having a specific frequency, an alarm signal is continuously generated for a predetermined time set by a timer, so that a warning notice is produced by an alarm device in accordance with the alarm signal.

Abstract: An anti-thief security sensor assembly wherein the alignment of the respective optical axes of the beam projecting unit and receiving unit with each other can be performed continuously over a required length of time is provided which includes a beam projecting unit (1) for emitting an infrared beam (IR), and a beam receiving unit (2) for receiving the infrared beam (IR) emitted from the beam projecting unit (1). The beam projecting unit (1) includes a first switch (16) adapted to be activated when a cover (10) protecting the beam projecting unit (1) is removed and for outputting a discriminative signal (B) descriptive of removal of such cover, and a transmitting circuit (17) for transmitting the discriminative signal (B) from the beam projecting unit (1) to the beam receiving unit (2), and a recognizing circuit (28) for receiving the discriminative signal (B) and outputting a notifying signal necessary to generate an alarm indicative of the removal of the cover (10).

Abstract: A sensing edge for controlling movement of a door by actuation of a device upon an external force being applied to the sensing edge includes an elongated generally flexible tubular sheath secured to the leading edge of the door. The sheath has a longitudinal axis generally parallel to a leading edge of the door and includes an elongated hollow cavity extending generally parallel to the longitudinal axis, a first open end and a second open end. The sensor system includes a transmitter near the first end of the sheath for transmitting a signal through the cavity toward the second end of the sheath. The sensor system also includes a receiver near the second end of the sheath in alignment with the transmitter for detecting a signal at the second end and for generating an output signal upon detection of an absence of the signal when the passage of the signal through the cavity is blocked.

Abstract: A method and apparatus for an event detector using an array of passive infrared detector elements, which uses interchangeable spectral filters and lenses to permit detection of a range of event types, which normally each require individual detectors with specific spectral/optical designs.

Abstract: An intrusion detector for detecting an intrusion into a protected space overlying a predetermined surface is provided. In one embodiment, the intrusion detector includes a housing to be mounted over the surface and including an infrared radiation sensor for sensing moving infrared radiation sources, and a transparent window thereover, a plurality of lens elements formed in the transparent window each oriented to receive infrared radiation from a moving infrared radiation source within a predetermined viewing zone of the protected space and to transmit infrared radiation from said source to the sensor; an alarm; and a control system for receiving the electrical output of the sensor and for outputting an alarm signal to the alarm when an infrared radiation source is detected simultaneously within at least two of the predetermined viewing zones.

Abstract: An improved hoistway access detection system including three safety chains, one for monitoring door position on the even numbered floors, one for monitoring door position on the odd numbered floors, and one for monitoring the position of the pit door, wherein an elevator car is slowly moved to the alternate floor upon detection and subsequent closure of an open pit door and any landing door.

Abstract: The invention is in a device for monitoring the position of a swinging door that is mounted on a stationary frame, the device essentially comprises a magnet and magnetic proximity sensor which are mounted in coaxially aligned relation on a pair of opposing leafs of a hinge. Means are provided for moving the magnet to and from the sensor to correspondingly vary the gap or spacing between them.

Abstract: A security sensor 1 having a disturbance detecting capability capable of detecting the presence of an obstacle purposefully applied to the sensor 1 in an attempt to fool or tamper the sensor 1 includes a carrier body A having an infrared sensor element 4, an incident side enclosure 5 mounted on the carrier body A, a light projecting element 11 for projecting a disturbance detecting beam L1, a light receiving element 12 for receiving disturbance detecting beam L1, first and second light guide members 8, 9 operatively associated with the light projecting element 11 and the light receiving element 12, respectively, said first and second light guide members 8, 9 being cooperative with each other to define an optical path L along and adjacent an outer surface of the incident side enclosure 5 or an outer surface of the carrier body A adjacent the incident side enclosure 5, a detecting circuit 15 for detecting a presence or absence of an obstacle, applied to at least one of the first and second light guide members 8

Abstract: Book Organizing Device with A flat, horizontally disposed shelf like member, a fixed, vertical end panel attached to one end of the shelf member, a slidable vertical panel having a constant force spring centrally attached under the shelf member, the slidable vertical panel exerting approximately one pound of force inwardly towards the fixed end panel, the constant force spring having an encoder ring mounted to the spring reel, a photo diode placed to read said encoder ring that provides a signal any time said ring is rotated, said signal triggering one of a plurality of short recorded messages to be broadcast from a speaker located on the underside of said book shelf, said messages being stored and selected by a digital programmable microprocessor designed for such purposes, and Said shelf member also having a rear book retaining bracket to prevent books from being pushed too far to the rear of the shelf.

Abstract: A tracking and monitoring system directs an infrared sensor toward a heat source such as a human body, and three-dimensionally tracks the heat source, wherein the infrared sensor has four infrared detecting elements appropriately located with respect to a reference point in the field of view for producing respective detecting signals varied in magnitude depending upon the parts of the image of heat source incident on the four infrared detecting elements so that a wired logic circuit controls the attitude of the infrared sensor in such a manner as catch the image of the heat source at the reference point.

Abstract: Inductive safety sensor for monitoring the condition of doors and gates, particularly of elevators, having a sensor device for sensing a target which is designed such that it emits a signal only when sensing a target made of a defined material and switches from a first constant current to another constant current when the target is sensed.

Abstract: A security sensor 1 having a disturbance detecting capability capable of detecting the presence of an obstacle 8 purposefully applied to the sensor 1 in an attempt to fool or tamper the sensor 1 includes a carrier body A having an infrared sensor element 4, an incident side enclosure 5, such as a lens defining a detection area B, mounted on the carrier body A, a light projecting element 11 for projecting a disturbance detecting beam L1 from inside of the incident side enclosure 5 towards the incident side enclosure 5, a light receiving element 12 for receiving the disturbance detecting beam L1 reflected from the incident side enclosure 5, and a detecting circuit 15 for detecting a presence or absence of the obstacle 8 on the incident side enclosure 5, based on an amount of light received by the light receiving element 12.

Abstract: An apparatus for the detection of any intruder passing through an electronic fence is disclosed. The electronic fence is formed by a millimeter wave radar positioned at one end of the fence and a plurality of reflectors placed along the floor of the fence as well as on a structure at its far end. The fence is formed of a plurality of electromagnetic beams traversing between the radar antenna or antennas and each of the reflectors. A sufficient number of beams inhabit the fence volume to make traversing the fence by an intruder without detection essentially impossible. The radar reflection from the intruder's person is used to report the location of an intruder attempting to traverse the electronic fence near the radar end and is the secondary means of detection at greater ranges where breaking of one or more electromagnetic beams constitutes the primary means of detection.

Abstract: A demodulator of an evaluating unit for a device for detecting objects derives a useful signal from a supplied input signal with the aid of a carrier signal. The demodulator further derives a test signal with the aid of a modulated carrier signal. An evaluator detects as a function of the useful signal whether an object is being detected and, as a function of the test signal the functionality of the device.

Abstract: Methods for remotely detecting whether a specific object is in a specific position or state. For example, to detect a desired condition, such as; that a residential sliding door is both fully closed and also locked, or a stove element is turned off, or that a window's pane of glass is intact. Optical methods are used, and in one embodiment a retroreflective surface is affixed to the door's locking handle, or the control dial for the stove element, or the glass surface, respectively, for this example. A narrow light beam illuminates the location where the retroreflective surface would be if; the door is closed and its lock handle is in the locked position, the control dial for the stove element is in the off position, or the window's glass is intact. If a monitoring device senses the retroreflected beam of light, then the retroreflective surface must be in the desired position, and the desired condition has been confirmed.

Abstract: A safety system for a vehicle including at least one sensor (20) viewing at least one region (22) in an interior portion of a vehicle defining a protected volume at least partially in front of the vehicle airbag, and logic circuitry responsive to the at least one sensor (20) for determining geometric data of objects (151) in the protected volume.

Abstract: The chamber (3) of the sensor (1) comprises a first and a second passage (16, 17) that communicate with the outside; a source of visible light (11) outside the chamber, through the first of the said passages (16), illuminates the interior of the chamber (3) and the spherical body (7) arranged inside it; an element sensitive to the quantity of light (9) outside the chamber to receive, through the second of the said passages (17), the light reflected from inside the chamber and electronic circuit that analyzes the electric signals correlated with the quantity of light seen by the said light-sensitive element (9) to generate at least one pulse that activates a movement control system of the means in which the sensor (1) is installed and an alarm system.

Abstract: An outdoor microwave transceiver intrusion detector that alternately transmits pulses of RF energy at two different frequencies and uses range and direction of travel information derived from the phase of the two Doppler responses to optimize the signal processing and apply range dependent thresholds. The time delay between the onset of the transmitted pulse and the sample of the Doppler response is controlled to provide an accurate range cutoff. The two frequencies are selected so that the difference in phase of the Doppler response at the two frequencies increases from zero to ninety degrees as the target goes from the Transceiver to the maximum range. Digital signal processing is used to measure the difference in phase of the two Doppler responses and translate this information into location of the target. The location information is used to create a number of range bins.

Abstract: A motion detection system for detecting an object's movement through a threshold in a selected direction comprises first and second transmitters for producing respective broadcast signals across the threshold along respective transmission paths, a receiver circuitry operative in an absence of movement through the threshold to receive the broadcast signals and generate a receiver circuitry reference signal, and operative upon interruption of both broadcast signals within a selected period of time to generate receiver circuitry interrupted output corresponding to movement of the object, respectively, through first and second transmission paths. Processing circuitry monitors the receiver circuitry and operates upon detection of the receiver circuitry interrupted output to produce an event detection signal, and output circuitry responds to generate selected output, thereby indicating movement of the object through the threshold in one of two movement directions.

Abstract: An automatic laser detecting surveyor's rod includes a normal surveyor's rod with an automatic laser beam search unit included. When the device is activated, the search unit moves up and down the surveyor's rod until the unit detects the level of the laser beam. When the beam is detected, an alarm sounds and a digital display shows the height of the beam at the detection point. The device can be made to include a limit means for the number of passes the search unit makes without detecting the beam. If the number of passes is exceeded, the device is deactivated to save power. The user may also choose to slow the travel speed of the search unit by moving it manually.

Abstract: A movement sensor has a spherical body freely movable within a chamber. Radiation is passed through the chamber from at least two different sources. Detectors opposite the radiation sources produce signals responsive to the amount of detected radiation which is dependent on the position of the spherical body relative to the chamber.

Abstract: A method and apparatus for detecting movement of an infrared-radiating object within a monitored space is provided. The method of includes exposing the monitored space to a passive infrared sensor having a first sensor element generating a first polarity signal when its field of view senses an infrared-radiating moving object, and a second sensor element generating a second polarity signal when its field of view senses an infrared-radiating moving object and determining the direction of movement of the detected object from the relative sequential order of the first and second polarity signals, for example for detecting intrusions in the monitored space to determine whether the movement direction is a hostile direction or a friendly direction.

Abstract: The invention concerns a method for discriminating between signals generated by means sensitive to variations in the pressure of a gaseous fluid. This method is characterized in that, in order to discriminate between electrical signals, it operates as follows: when a means (5) sensitive to pressure variations generates an electrical signal, the evolution of the amplitude of at least one characteristic of this signal is monitored and, when two successive amplitude variations (A1, A2) substantially opposite relative to a median value (M) are detected, a means (6) for informing people is inhibited, whereas when amplitude variations of a different type are detected, the means (6) for informing people is activated.

Abstract: A shutter assembly includes a structure which surrounds an opening and a shutter including a plurality of laths hingedly connected together at their longitudinal edges and moveable across the opening in a direction substantially normal to those longitudinal edges between an opened position and a closed position to respectively open and close the opening. A latch mechanism is operable to retain the shutter in the closed position. The latch mechanism includes at least one latch member mounted on the shutter and, for each latch member, at least one keeper mounted on the structure and which has a portion with which the respective latch member may be engaged to latch the shutter in the closed position.

Abstract: A method and a device for detecting the breakage of glass. The glass breakage detector comprises an acoustic transducer, an analog-to-digital converter, and a processing means which uses software algorithms to determine if a signal received by the acoustic transducer is a result of glass breaking. The glass breakage detector further comprises amplifiers which have a greater gain response for higher frequency components in the received signal. The glass breakage detector is also able to correct the offset error generated by the amplifiers. The processing means or digital signal processor (DSP) uses a feature extraction software algorithm that extracts characteristics of the received sound using a plurality of filters centered at different frequencies and a rules analysis software algorithm to compare the extracted features to features from glass breakage and false alarms. The DSP is also capable of transmitting the extracted features to an external computing device for further analysis.

Abstract: An automatic sliding door system especially well suited for use in walk-in freezer or refrigerator units includes an exterior sensor unit for detecting opening conditions on the exterior of a freezer or refrigerator unit, and an interior sensor unit for detecting opening conditions in the interior of the freezer or refrigerator unit. Each sensor unit comprises both a motion sensor and a presence detector. The motion sensor detects motion towards the sliding doors, and opens the doors as they are approached. Once motion is detected, the motion sensor tracks the motion no matter whether towards or away from the door, and keep the doors open so long as the motion is present. The presence detector of each sensor unit detects a change in the ambient conditions directly underneath the doorway, and keeps the door open when the ambient conditions change. The right and left side doors that are opened and closed simultaneously and in synchronism using a pulley mechanism connected to both the right and left side doors.

Abstract: An improved battery operated combination burglar alarm and door chime mounted to the inside of a door from where the alarm and chime modes are selected. A dead bolt slide cooperates with a jamb plate fastened to the door frame to manually arm the device from the inside with the door closed. Opening the door activates the dead bolt and sounds the alarm. A magnetically sensitive switch within the device cooperates with a magnet fastened to the jamb plate and further cooperates with a mode selection switch to effect either the chime mode or delayed alarm mode when the door is opened. The delayed alarm mode is activated with the door open to permit pre-arming the device followed by automatic arming of the device when the door is closed.

Abstract: An occupant position measuring system (10) comprising: a transmitter for generating a pulse modulated transmitter signal; a receiver for receiving a reflection of the transmitter signal, the receiver being characterized as having a relatively low Q factor; a controller, responsive to the receipt of the reflected signal and for generating an indication of the distance between an occupant the transmitter.

Abstract: A door warning system comprising a sensor adapted to sense the presence of persons immediately adjacent a first side of a swinging door; an audio or visual alarm responsive to the sensor adapted to advise a person on a second side of the door being opposite the first side of the presence of a person on the first side of the door.

Abstract: An automated and seemingly animated door knocker is disclosed that includes a housing with a pivotably connected knocking member, the housing being releasably supported on the door by an over-the-door hanger or other similarly satisfactory attachment device, and the knocking member being reciprocated by a battery-powered, motor-driven linkage that is controlled by an integrated circuit and activated by a difference in light intensity as sensed by a photocell when someone approaches the door. A sound generator controlled from the circuit board is also desirably activated contemporaneously with the motor-driven linkage to play a prerecorded sound sequence.

Abstract: An intrusion detection system for detecting objects entering a particular region is comprised of a transmitter, receiver and cable assembly, wherein the transmitter and receiver are connected at opposite ends of the cable assembly. In a first embodiment, the cable assembly is comprised of a transmit and receive cable pair that are aligned at each end and positioned at a constant distance from each other along the length. The transmitter is connected to the transmit cable at one end of the cable assembly, and the receiver is connected to the receive cable at the opposite end of the assembly, with a uniform electromagnetic field established between the cables. An intrusion perturbs the field, which causes a change in the magnitude and/or phase of the received signal. In a second embodiment, the cable assembly is comprised of a single detection cable with the transmitter and receiver connected to opposite ends.

Abstract: A passive infrared sensor uses a modified lens or mirror to vertically elongate the detection zones in regions close to the sensor. This vertical elongation reduces the signal produced by a small pet, such as a cat, while the greater height of a human intruder produces a larger signal.

Abstract: A laser security fence apparatus is disclosed for providing a warning signal in response to an intrusion by an intruder of a restricted area. The apparatus includes a laser generator for generating a laser beam and a first mirror aligned with the laser beam for reflecting the beam. A second mirror is aligned with the first mirror for reflecting the beam reflected by the first mirror and a collector is aligned with the second mirror for collecting the beam reflected by the second mirror. A microprocessor is associated with the collector and the generator for sensing when the beam is broken by the intruder so that the beam is not received by the collector. An alarm is connected to the microprocessor for actuation by the microprocessor when the microprocessor senses that the beam is broken so that the alarm provides the warning signal.

Abstract: A device for finding a position of a human comprises a micro controller, a pyro-electrical infrared sensing unit, a first motor, a rotating speed feed back unit, an ultrasonic sensing unit and a second motor. The infrared sensing unit is fitted to an edge of a disc coupled to the shaft of the first motor. The rotating speed feed back unit has a rotating disc which is also coupled to the shaft of the first motor. The ultrasonic sensing unit is fitted to an edge of a second disc coupled to the shaft of the second motor such that it can move with rotating of the second disc. The micro controller activates the first motor and the infrared sensing unit to search for a human, and figures out the direction of that human by means of the rotating speed feed back unit. At the same time, the controller activates the second motor for the ultrasonic unit to be directed to the found human; thus, the distance from that human to the device is available.

Abstract: A safety device for externally driven systems for protecting the movement of a system component against undesired collision with an object lying in the movement path of the system component is described, the system component to be monitored being capable of being moved in a guided fashion along a predetermined path (door plane ET). The movement path of a leading edge of a system component is preferably monitored by an optical beam protection, preferably on the basis of infrared beams, which protection has at least two, preferably at least three or a plurality of preferably parallel beams which are arranged staggered in the direction of movement of the system component and which are emitted on one side of the system component and received or reflected on the other side. The safety device has a safety circuit with which the movement of the system component is stopped or reversed if an obstacle is sensed in the movement path of the system component.

Abstract: An automatic sliding door system especially well suited for use in walk-in freezer or refrigerator units includes an exterior sensor unit for detecting opening conditions on the exterior of a freezer or refrigerator unit, and an interior sensor unit for detecting opening conditions in the interior of the freezer or refrigerator unit. Each sensor unit comprises both a motion sensor and a presence detector. The motion sensor detects motion towards the sliding doors, and opens the doors as they are approached. Once motion is detected, the motion sensor tracks the motion no matter whether towards or away from the door, and keep the doors open so long as the motion is present. The presence detector of each sensor unit detects a change in the ambient conditions directly underneath the doorway, and keeps the door open when the ambient conditions change. The right and left side doors that are opened and closed simultaneously and in synchronism using a pulley mechanism connected to both the right and left side doors.

Abstract: A probe for measuring an electromagnetic field is described. A sensing element senses the electromagnetic field and generates a sensing signal indicative thereof. The sensing signal is characterized by a first modality. First conversion circuitry coupled to the sensing element converts the sensing signal to a second modality. A transmission medium coupled to the first conversion circuitry transmits the sensing signal in the second modality. Measurement circuitry coupled to the transmission medium receives the sensing signal in the second modality and generates measurement data corresponding to the electromagnetic field.

Abstract: A dual-sensing intrusion detection device for detecting an intruder comprising a PIR sensor and a microwave sensor. The device comprises PIR processing means and microwave processing means, means for summing the processed PIR signal with the processed microwave signal to generate a summed signal, and means for comparing the summed signal to a sum threshold value to determine if an alarm condition exists. The sum threshold value is selected for optimal discrimination between a human intruder and an animal presence. An additional feature of the intrusion detection device is the generation of a PIR difference signal. This feature allows the device to compensate for the limited bandwidth of the PIR sensor and to be more sensitive to a human intruder. The processing of the sensor signals includes an integration technique that sums the amplitude values of the signal and causes the sum to decay at a slow rate.

Abstract: The present invention concerns a motion sensor for use with a light. The device includes a housing having an outer edge and an interior space in which a plurality of sensors are located. The sensors convert infrared into an electronic signal that is processed to detect motion. A lens located is also used which is located on an outer edge of the housing for directing infrared to the sensors which may be generally arranged in a U-shaped pattern to promote a 270 degree motion detection zone. The ends of the lens are recessed into and held in the interior of the housing a spaced distance from the outer edge of said housing so as to detect motion occurring rearward of the sensors.

Abstract: To generate an alert signal indicating that an unauthorized subject is in a first region within seven feet of a passageway, a radio transmitter is worn by the subject and received by a receiver at the passageway. A second signal is generated upon satisfaction of a second condition, such as an open door at the passageway, which second signal indicates the likelihood of the subject passing through the passageway. A first display indicates if the first signal is present and a second signal if the second condition occurs.