Abstract: A light scattering type smoke sensor includes a sensor body, light-emitter for emitting light toward an open smoke-sensing space and outputting a light-received signal according to the amount of scattering light received, and a fire judging unit for judging whether fire occurs or not on the basis of the amount of received light determined on the basis of the outputted light-received signal.

Abstract: A smoke alarm comprises smoke detection circuitry for detecting smoke and generating a detection signal responsive thereto. Proximity detection circuitry generates a proximity detection signal responsive to detection of an object within in a selected distance of the smoke alarm. Alarm generation circuitry generates an audible alarm responsive to the detection signal. The audible alarm may be deactivated for a predetermined period of time responsive to at least one proximity detection signal.

Abstract: This disclosure describes systems, methods, and apparatus for rapidly detecting smoke or other particles or aerosols generated in any one or more compartments of a multi-compartment electronics enclosure. The herein disclosed system includes a particle sensor and an airflow controller that pulls air and particles from the one or more compartments through fluid pathways and into the particle sensor.

Abstract: A device for controlling a driven movement element with an electronic unit is proposed, which comprises a transmitter for electromagnetic radiation, for example, light, in particular infrared light, and a receiver for electromagnetic radiation emitted by a transmitter for the detection of objects on a propagation path between transmitter and receiver. According to the invention, the electronic unit is designed to detect a temporal change in at least one feature derived from the received electromagnetic radiation and, upon a detection of a change in the at least one feature that is comparatively slow over time, to output a signal that is associated with a detection of smoke.

Abstract: A sensor device detects an object, in particular for optically detecting smoke particles. The sensor device contains a transmitting device for emitting transmit radiation, a receiving device for receiving receive radiation having scattering radiation that is generated by an at least partial scattering of the transmit radiation by the object, and for outputting a measurement signal indicative of the receive radiation, a signal modification device for modifying the measurement signal and for outputting a modified measurement signal, a level of the modified measurement signal increasing after the transmitting device has been switched on, and a calibration device for monitoring the modified measurement signal. The calibration device is embodied such that a reaching of a predefined signal level for the modified measurement signal can be detected and that a time interval between the switching on of the transmitting device and the reaching of the predefined signal level can be determined.

Abstract: A smoke detector includes processing circuitry coupled to a camera. The field-of-view of the camera contains one or more targets, each having spatial indicia thereon. At least a portion of one of the targets is coated, at least in part, by an infra-red absorbing dye. The dye produces visually discernable dark areas on the coated target(s).

Abstract: A detector (101) for detecting smoke from a fire and generating an alarm has a detection chamber (105) in which a light source (111) and a light detector (113) are arranged. In normal use, the light detector (113) only receives light from the light source that has been scattered by the presence of smoke in the chamber (105). When testing the detector (101), the light detector (113) receives light from the light source (111) by presenting a reflecting surface (129a) of a rotor member (129) to reflect light from the light source (111) towards the light detector (113). In normal use, the rotor member (129) is positioned so that the reflecting surface (129a) no longer reflects light from the light source (111) towards the light detector (113).

Abstract: The present smoke detection system uses a single sensor to quickly detect both fast flaming fires and smoldering fires while further reducing nuisance and false alarms. In the present detector, the sensor is preferably an ionization sensor. Specifically, a first algorithm is used to detect flaming fires and second algorithm is used to detect smoldering fires. An alarm is sounded when either algorithm generates an alarm condition. In each embodiment, the first algorithm generates an alarm condition when a sensor output signal exceeds a first threshold. The alarm condition is generated for the second algorithm when the sensor output signal: (1) exceeds a second threshold for T time.; (2) rate of change exceeds a predetermined rate of change threshold; (3) change between time Tn and time Tn-1 exceeds a predetermined change threshold; or (4) sensor signal exceeds an historic standard deviation of the signal multiplied by a predetermined constant.

Abstract: Techniques are generally described related to a method and system for monitoring gas concentrations. One example gas monitoring apparatus includes a light source, a MEMS micro-mirror arranged to be in an optical path of a light from the light source that has passed through a sample and configured to direct selected wavelengths of the light to a single detection point, a detector arranged at the single detection point and configured to convert incident light into electrical signals, and a processor programmed to determine a gas concentration of one or more gases in the sample based on the electrical signals.

Abstract: An alarm for detecting radiation and/or pollutants such as smoke, carbon monoxide or the like, the alarm comprises: an alarm circuit (12) including detection means (14) for detecting the radiation and/or pollutants, and an audible alarm (16); a power supply circuit (24) connectable to an external AC power supply for supplying standby power to the alarm circuit (12); and a battery (20) for supplying power to the audible alarm (16) when the alarm is energized. The power supply circuit (20) is configured to supply current to the alarm circuit (12) at a level less than that required to energize the audible alarm (16).

Abstract: [Problem to be Solved] To provide a smoke sensing system, a smoke sensor and a receiver that can accurately determine the type of smoke.

Abstract: A smoke detector is disclosed that comprises a smoke detection chamber comprising: a light source operable to provide radiation to an interior space of the smoke detection chamber, and a light detector operable to receive radiation scattered by one or more radiation scatting particles in the interior of the smoke detection chamber; an alarm control module, in communication with the smoke detection chamber and a processor, operable to produce an alarm indicating a presence of a predetermined threshold of the one or more radiation scattering particles; a computer readable medium comprising instructions that when executed by the processor, cause the detector to perform an alarm compensation threshold method comprising: comparing a calibrated clear air voltage measurement with an average clear air voltage measurement; adjusting an alarm threshold sensitivity, based at least in part, on the comparison of the calibrated clear air voltage measurement and the average clear air voltage measurement.

Abstract: A system detects presence of particles in the air of guest rooms of facilities such as motels and hotels for example that indicate that guests are engaged in recreational smoking. The system provides an indication to the facility manager of such behavior.

Abstract: A photoelectric smoke detector 1 for detecting smoke particles 4 is disclosed, the smoke detector 1 comprising: a light emitting element 5, a light receiving element 6 for receiving light 8 emitted by the light emitting element 5 and scattered by the smoke particles 4 and for outputting a detection signal 12 obtained by photoelectrical converting the received light 10, 11, an amplifier circuit 13 for amplifying the detection signal 12 and providing an amplified output signal 14, wherein the amplified output signal 14 may be divided into an offset-signal 20 and an amplified detection signal 21, whereby the photoelectric smoke detector 1 is adapted to operate in a pulsed mode, so that the detection signal 12 comprises high-frequency components, whereby the amplified detection signal 21 is determined by high-frequency components of the detection signal 12 and that the offset-signal 20 is determined by low-frequency components of the detection signal 12 and/or by low-frequency components of at least an intermedia

Abstract: A smoke detector contains a radiation source for transmitting an illuminating radiation having a time sequence of radiation pulses, a radiation detector for receiving measurement radiation impinging on the radiation detector after at least partial scattering of the illuminating radiation, an amplifier circuit for amplifying an output signal of the radiation detector, an analog to digital converter having a sample and hold circuit for converting an analog output signal of the amplifier circuit into a digital measurement value, and a control device coupled to the radiation source and the sample and hold circuit. The control device is equipped for controlling the radiation source and the sample and hold circuit such that the time of a sampling point in time of the sample and hold circuit relative to a radiation pulse depends on the duration of the radiation pulse. A method for calibrating the described smoke detector is also revealed.

Abstract: A high sensitivity smoke detector includes a housing which defines an internal, closed, scattering region, and an external, open scattering region. A cyclone-type separator draws atmosphere adjacent the external scattering region into the detector and separates the larger, non-smoke related particulate matter which flows into the internal, closed scattering region for sensing and subsequent analysis. An annular inflow pattern can be established with a central exit flow.

Abstract: A smoke alarm has a base element with a flat mounting surface, a light emitter that is attached to the mounting surface and that is configured to issue an illuminating light, and a light receiver that is attached to the mounting surface next to the light emitter and that is configured to receive a measurement light that results from a back-scattering of the illumination light at a measurement object located in a detection space. A data processing device is coupled to an output of the light receiver and configured to evaluate temporal changes of an output signal issued by the light receiver. Also, there is provided a method for checking the functional capability of the smoke alarm.

Abstract: A sensor apparatus for optically detecting an object includes (a) a first emitting device, configured to emit a first emission beam, (b) a first receiving device, configured to receive a first reception beam, (c) a second receiving device, configured to receive a second reception beam, and (d) an evaluation unit connected downstream of the first receiving device and the second receiving device. The first reception beam and/or the second reception beam contains scattered light which is produced when an at least partial scattering of the first transmission beam occurs at the object. The evaluation unit is coupled to the first receiving device and the second receiving device so as to receive a difference signal between a first output signal of the first receiving device and a second output signal of the second receiving device. The sensor apparatus may be incorporated in a proximity sensor and a danger warning system.

Abstract: A danger sensor (100) is described which features a first housing part (110), a second housing part (120), a detector unit (112) for detecting of a danger situation, wherein the detector unit (112) is arranged in or at the first housing part (110), and an electrical connection (114a, 114b) for connecting of at least one supply element (142a, 142b) which provides electric power to the detector unit (112) during operation. The first housing part (110) together with the second housing part (110) is designed so that a holding area is present between the two housing parts (110, 120) for the at least one supply element (142a, 142b), and that the volume of the holding area is variable by means of a volume adjustment element (130). Furthermore, an element (130) is described for adapting a danger sensor to different requirements regarding the power supply; also described is an arrangement for detecting of a danger situation and a method for retrofitting of the power supply to a danger sensor (100).

Abstract: Particles to be detected are irradiated by first wavelength light and second wavelength light. The light that is scattered by the particles is converted into a first and second scattered-light signals. The two scattered-light signals are normalized with respect to one another such that the amplitude profile thereof approximately corresponds to larger particles such as dust and steam. Furthermore, an amplitude ratio is formed between the two scattered-light signals and an amplitude comparison value (90%) is set, which corresponds to a predeterminable particle dimension in the cross-over region between smoke and dust/steam. Mainly the first scattered-light signal is evaluated if the amplitude ratio exceeds the amplitude comparison value (90%) and a dust/steam-density signal is emitted. In the other case, mainly the second scattered-light signal that is evaluated and a smoke-density signal is emitted.

Abstract: A temperature monitoring circuit includes a negative temperature coefficient (NTC) resistor, a zener diode, an alarm, a silicon controlled rectifier. A first terminal of the NTC resistor is connected to a power supply through a first resistor. A second terminal of the NTC resistor is grounded. A cathode of the zener diode is connected to a node between the NTC resistor and the first resistor. An anode is grounded through a second resistor. A first terminal of the alarm is connected to the cathode of the zener diode, and is grounded through a third and fourth resistors in series. A cathode of the silicon controlled rectifier is connected to the anode of the zener diode. An anode of the silicon controlled rectifier is connected to a second terminal of the alarm. A control terminal of the silicon controlled rectifier is connected to a node between the third and fourth resistors.

Abstract: The invention provides use of one or more emitted beams of radiation (16), for example, laser beam(s), in combination with an image capturing means (14), for example, one or more video cameras and/or optical elements to detect particles (30), for example smoke particles, located in an open space (12).

Abstract: The optical scattering-based smoke detector comprises a scattering zone accessible to the smoke, a printed circuit forming a supporting member and a first and second light reflectors mounted on a common supporting member. An electronic smoke detection unit, a light emitter and a light receiver are mounted on the printed circuit. The receiver is sensitive to at least some of the wavelengths of the light rays emitted by the emitter. The first light reflector facing the emitter to direct the emitted light into a detection zone in the scattering zone. The second light reflector facing the receiver to direct, in the presence of smoke in the scattering zone, the scattered light from the detection zone onto the receiver. A single mechanical part comprises the first and second light reflectors and a link resistant to the passage of the light from the first light reflector to the second light reflector.

Abstract: The portable heat and smoke detection system includes a detecting means that is portable and remotely located with respect to an alarming means. The alarming means informs the end user to the detection of smoke, fire, or carbon monoxide via the detecting means. The detecting means may or may not include a light and audible alarm; whereas the alarming means may include a light, audible alarm, cellular telephoning capability, text messaging capability, and/or an e-mail capability.

Abstract: A smoke detector or, more generally, a danger detector, operates in an area with increased radioactive radiation disposition danger detector has at least one detector unit for detecting at least one danger characteristic, a semiconductor component and other electrical components, at least for outputting an alarm signal. The danger detector also has a temperature control circuit. The temperature control circuit is configured to control the temperature of the at least one semiconductor component. The danger detector may be embodied as a linear smoke detector.

Abstract: A fire distinguishing device includes: a detection device which detects an outbreak of a fire; a fire presence/absence distinguishing device which distinguishes the presence or absence of the fire; and a cumulative time determining device which determines the cumulative time required for distinguishing the presence or absence of the fire, in the fire presence/absence distinguishing device. The cumulative time determining device distinguishes an environment type of an environment where the detection device is installed, or a phenomenon type of a phenomenon being detected by the detection device, and further determines the cumulative time according to the distinguished environment type or phenomenon type.

Abstract: A surface mountable radiation guide for a radiation path between a measurement volume (1) and an electro-optical component has a first radiation interface in a radiation path towards the measurement volume, a third radiation interface in a radiation path towards the electro-optical component, and a reflecting portion forming a first radiation path between the first and the third radiation interface, said first radiation path providing a focus region at the measurement volume.

Abstract: An infrared detector comprising a plurality of bolometer detectors, bias circuitry for applying a bias to the bolometer detectors, and connectors for connecting the bolometer detectors together to form a network, wherein the bolometer detectors are arranged in an environment at substantially atmospheric pressure. A method for increasing the sensitivity of an infrared detector, having a plurality of bolometer detectors arranged in an environment at substantially atmospheric pressure so as to at least partly compensate for a reduction in the sensitivity of the infrared detector due to conduction of thermal energy from the bolometer detectors through the environment, the method comprising at least one of the steps of connecting the bolometer detectors together in at least one of series and parallel, and operating the bolometer detectors at a DC bias current.

Abstract: A method and apparatus is provided for activating a carbon monoxide detector. The method includes the steps of the carbon monoxide detector measuring a current carbon monoxide level, the carbon monoxide detector comparing the current carbon monoxide level with a first threshold value, determining whether the current carbon monoxide level exceeds the first threshold value, entering an alarm state upon detecting that the current carbon monoxide level exceeds the first threshold value after a first predetermined time period, determining from memory whether the carbon monoxide detector had previously been in an alarm state before activation and upon detecting that the current carbon dioxide level does not exceed the first threshold and the carbon monoxide detector was previously in the alarm state, resuming the alarm state after a second predetermined time period.

Abstract: Smoke alarm comprising at least one internal chamber, which chamber has at least one opening towards the surroundings, such that air may pass through the chamber, and where means are provided for emitting light and means for detecting said light is provided in or around said chamber, where the change in light intensity registered by the means generates a smoke alarm.

Abstract: A photo-electric smoke detector includes a source of radiant energy and a closed loop control circuit which responds to a radiant energy feedback signal to adjust an output characteristic of the emitted radiant energy and which evaluates a quality characteristic of the emitted radiant energy. The feedback circuit and the source can be intermittently activated. Emitted radiant energy is directed toward a lens. The feedback signal is proportional to radiant energy reflected or scattered off of the lens.

Abstract: A system for analyzing smoke has a plurality of units, wherein each unit includes an optical emitter for alternately directing horizontally and vertically polarized light along a beam path, and into a smoke cloud, to generate scattered light. A horizontally polarized detector and a vertically polarized detector are positioned at different locations, but at a same distance and scattering angle relative to the beam path. Each unit has a different wavelength. A computer receives signals from the detectors of all units, in response to each emitter, for analysis of the smoke.

Abstract: A device for controlling a driven movement element with an electronic unit is proposed, which comprises a transmitter for electromagnetic radiation, for example, light, in particular infrared light, and a receiver for electromagnetic radiation emitted by a transmitter for the detection of objects on a propagation path between transmitter and receiver. According to the invention, the electronic unit is designed to detect a temporal change in at least one feature derived from the received electromagnetic radiation and, upon a detection of a change in the at least one feature that is comparatively slow over time, to output a signal that is associated with a detection of smoke.

Abstract: A high sensitivity smoke detector includes a housing which defines an internal, closed, scattering region, and an external, open scattering region. A cyclone-type separator draws atmosphere adjacent the external scattering region into the detector and separates the larger, non-smoke related particulate matter which flows into the internal, closed scattering region for sensing and subsequent analysis. An annular inflow pattern can be established with a central exit flow.

Abstract: A photoelectric smoke detector is capable of preventing an erroneous alarm from being issued even when steam flows into a smoke detecting unit. The smoke detecting unit includes: an installation section; and a smoke inlet section. The installation section includes: a light emitting element for emitting light to an inside of the installation section; and a light receiving element for receiving the light emitted from the light emitting element. The smoke inlet section includes: a plurality of wall members for preventing external light from entering the smoke inlet section; and a smoke inlet formed between the plurality of wall members. The installation section and the smoke inlet section are arranged so as to overlap each other, with the smoke inlet section being positioned on a lower side of the installation section, and are communicated with each other through an opening.

Abstract: A particle detector has a sample area of cross section no in excess of about 2 mm for containing environmental fluid, a light source on one side of the sample area for directing a collimated or nearly collimated beam of light through the sample air or water so that part of the light beam will be scattered by any particles present in the air or water while the remainder remains unscattered, and a beam diverting device on the opposite side of the sample area for diverting or blocking at least the unscattered portion of the beam of light and directing at least part of the scattered light onto a detector. The detector produces output pulses in which each pulse has a height proportional to particle size and a pulse height discriminator obtains the size distribution of airborne particles detected in the air or water sample at a given time from the detector output. The detector may also include a device for discriminating between biological agents and inorganic particles.

Abstract: A sensor device detects an object, in particular for optically detecting smoke particles. The sensor device contains a transmitting device for emitting transmit radiation, a receiving device for receiving receive radiation having scattering radiation that is generated by an at least partial scattering of the transmit radiation by the object, and for outputting a measurement signal indicative of the receive radiation, a signal modification device for modifying the measurement signal and for outputting a modified measurement signal, a level of the modified measurement signal increasing after the transmitting device has been switched on, and a calibration device for monitoring the modified measurement signal. The calibration device is embodied such that a reaching of a predefined signal level for the modified measurement signal can be detected and that a time interval between the switching on of the transmitting device and the reaching of the predefined signal level can be determined.

Abstract: A detector comprises a detector base (1) and first and second detector elements (2 & 3) each having a respective electronic interface (2a, 3a). The detector base (1) has electronic interfaces (1a) to the electronic interface (2a, 3a) of each of the detector elements (2, 3), wherein at least one of the detector elements is constructed as a replaceable module (11).

Abstract: Systems, methods, and apparatus for automatically disabling an appliance. When a smoke detector/alarm is activated, a signal or message is sent to at least one safety device operatively coupled to at least one appliance. The appliance is disabled in response to receiving the signal or message. The systems, methods, and apparatus are based on the implicit assumption that, if a smoke detector/alarm is activated, the source of the smoke is likely due to a nearby appliance that is in use.

Abstract: A particulate detector system is provided that can sense particulates (such as smoke in the air). The system employs a reflected light system that generally avoids making measurements of light intensity. Instead, coded signals are compared with one another to determine error rates between emitted light and detected light (across a chamber). Based on the error rate, processing circuitry can determine particulate concentration.

Abstract: A window with built-in devices that senses carbon monoxide; powered only by the exterior daylight; that automatically opens by itself and sounds an alarm when a dangerous level of carbon monoxide is sensed to release the accumulated carbon monoxide and let the clean air with fresh oxygen enter the contaminated area to prevent or minimize poisoning and/or death of humans & animals without the need of any human physical action; the provided contacts can be connected to a private alarm station to alert the Fire & Police Departments to provide immediate assistance to the endangered humans & animals and protect the opened residence.

Abstract: A combination smoke and heat detector which allows, in spite of a simple structure, light emitted from an indication lamp to be visually confirmed from a wide range of directions. The combination smoke and heat detector (100) includes a body base (10), a printed circuit board (1), a thermosensitive element (2), a dark chamber (3), an indication lamp (4) mounted to the printed circuit board (1), a protective cover (30), and a bar-like light guide (5) for guiding light emitted from the indication lamp (4) to the outside of the protective cover (30). The light guide (5) passes through a light guide through-hole (35) formed in the protective cover (30) so as to be mounted therein, with one end surface thereof facing the indication lamp (4), and another end surface thereof protruding to the outside of the protective cover (30) by a height substantially equal to or larger than a protruding height of the dark chamber (3).

Abstract: To enable an air velocity of sampling air to be precisely measured, a smoke detector (S) includes: a smoke detection part (22) connected to a sampling pipe (11); a fan (12) that sucks sampling air (SA) into the sampling pipe; and an air velocity sensor (15) that measures an air velocity of the sampling air within the sampling pipe. The air velocity sensor (15) is disposed at a primary side of the fan (12), and a straightening vane (25) is disposed between the air velocity sensor (15) and a suction port (12a) of the fan (12).

Abstract: An aspirated smoke detector includes a smoke sensor, an aspirator and variable speed control circuits. As the concentration of smoke increases, the speed control circuits can increase aspirator speed from a first, nominal value to a second, higher value.

Abstract: To enable an air velocity of sampling air to be precisely measured, a smoke detector (S) includes: a smoke detection part (22) connected to a sampling pipe (11); a fan (12) that sucks sampling air (SA) into the sampling pipe; and an air velocity sensor (15) that measures an air velocity of the sampling air within the sampling pipe. The air velocity sensor (15) is disposed at a primary side of the fan (12), and a straightening vane (25) is disposed between the air velocity sensor (15) and a suction port (12a) of the fan (12).

Abstract: A signal is described that includes one or more LEDs that emit light and a lens that receives and collimates the light from the LED array. A distribution optic receives light from the collimating lens and distributes the light in a predetermined pattern according to a specification. A light absorbing/reflecting element is located in an area proximate the one or more LEDs to minimize light received from an external source from exiting the signal.

Abstract: A multi-frequency photoelectric smoke detector includes a multi-frequency, source and an multi-frequency sensing array. The array can be part of a solid state camera which can be used to sense scattered multi-frequency light. Multiple wavelength signals, red, blue green for example, emitted by the camera can be analyzed to determine a degree of airborne particulate matter in a sensing region between the source and the array.

Abstract: A fire detector and method of using it generate a fire alarm through use of a smoke detector and a carbon monoxide detector once the smoke detector detects a threshold level of light obscuration for greater than a first pre-selected time period or a reduced threshold level of light obscuration for greater than a second pre-selected time period or the CO detector detects a rate of increase in CO concentration which exceeds a first preselected CO rate for a third pre-selected time period and the smoke detector detects the reduced threshold level of light obscuration or the rate of increase in CO concentration exceeds a second preselected CO rate for a fourth pre-selected time period.

Abstract: To enable an air velocity of sampling air to be precisely measured, a smoke detector (S) includes: a smoke detection part (22) connected to a sampling pipe (11); a fan (12) that sucks sampling air (SA) into the sampling pipe; and an air velocity sensor (15) that measures an air velocity of the sampling air within the sampling pipe. The air velocity sensor (15) is disposed at a primary side of the fan (12), and a straightening vane (25) is disposed between the air velocity sensor (15) and a suction port (12a) of the fan (12).

Abstract: A security system for portable articles is provided. The security system includes a central unit and one or more remote units. Each remote unit has a tethering system which attaches one or more portable articles to the remote unit. When a portable article is detached from the remote unit, a remote alarm signal is generated, which is conveyed to the central unit via a radiofrequency transmission. The central unit confirms receipt of an alarm transmission, and activates a dialer, which contacts one or more individuals via telephone.