Class / Patent application number | Description | Number of patent applications / Date published |
340630000 | Photoelectric | 30 |
20080218364 | PHOTOELECTRIC SMOKE SENSOR AND LIGHTING EQUIPMENT - The photoelectric smoke sensor includes a casing member | 09-11-2008 |
20080218365 | Smoke detector - Provided is a smoke detector having a structure in which, at a time of performing smoke detection, an S/N ratio of a signal of a light receiving element is improved, to thereby accurately detect occurrence of fire. At both end portions of an inside of an optical case ( | 09-11-2008 |
20080258925 | Fire Detector - A fire detector | 10-23-2008 |
20080297361 | Smoke Detector - A smoke detector having a closed internal optical path can detect airborne particulate matter, such as smoke from a fire, via a light scattering sensor and/or a light absorption sensor. The path can be implemented with a plurality of reflectors, such as piezoelectric minors. Input light can be coupled to the path, on a pulsed basis, for example via one of the minors, in a resonant condition. | 12-04-2008 |
20080316039 | Apparatus and Method For Infrared Beam Smoke Detection - Infra-red beam smoke detection apparatus comprises an infra-red transmitter or detector or both, in which the or each transmitter or detector is mounted in a housing for angular adjustment to vary the beam direction relative to a fixed axis of the housing, comprising an electrically-driven actuator for effecting the angular adjustment of the beam direction. Also, the infra-red beam transmitter has a visible light beam transmitter arranged selectively to transmit a collimated beam of visible light coaxially with the infra-red beam. A remote interface unit (RIU), for an infra-red beam smoke detection system comprising distributed infra-red transmitters and detectors, is formed to be fixed to a wall surface and to be connected to external cables for power and data transfer to and from the transmitters and detectors, and has electronic means for controlling the transmitters and detectors remotely through the external cables to ensure their optical alignment and to determine the presence of smoke so as to trigger an alarm. Also, an infra-red beam smoke detection apparatus comprises a base unit having an internal electrical wiring terminal arrangement for connection to an external electrical cable for power supply and data transfer; connectable by bayonet coupling to a head unit containing optical components and electronic circuitry and an electrical terminal arrangement connected to the electronic circuitry. | 12-25-2008 |
20090009347 | Scattered Light Smoke Detector - A scattered light smoke detector containing an optoelectronical assembly for measuring scatter signals detected below at least one forward scatter angle and at least one backscatter angle and evaluation electronics for determining an alarm value in accordance with the difference between the scatter signals. Smoke signals are produced from the scatter signals by means of a pre-processing step and a measured value is obtained from the smoke signals. The measured value is formed by a linear linking of the sum of the smoke signals to the difference between the smoke signals BW, FW or by establishing the value for the difference between the smoke signals. The linear linking is calculated according to the formula k | 01-08-2009 |
20090009348 | PHOTOELECTRIC SMOKE SENSOR AND ELECTRONIC EQUIPMENT - In a photoelectric smoke sensor, a casing has a bottom cover section in which a plurality of holes are formed. The bottom cover section having the holes has a function of allowing smoke to flow into and out of a smoke detecting section and preventing insects from entering the smoke detecting section from outside of the smoke detecting section. Thus, smoke is smoothly introduced from the lower side of the smoke detecting section into the smoke detecting section and there is no necessity of installing a large insect screen at the entrance of smoke flowing from the outside. | 01-08-2009 |
20090109043 | Smoke Detectors - 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. | 04-30-2009 |
20100039274 | PARTICLE MONITORS AND METHOD(S) THEREFOR - The present invention relates to the field of the detection, analysis and/or determination of matter or particles suspended in fluid. In one particular form, the present invention relates to smoke detectors, which detect unwanted pyrolysis or combustion of material. In another form, the present invention relates to smoke detectors of the early detection type, and which may be applied to ventilation, air-conditioning or duct monitoring of a particular area. In yet another form, the present invention relates to adjusting the sensitivity of particle detectors. | 02-18-2010 |
20100085200 | DETECTOR - A detector comprises a detector base ( | 04-08-2010 |
20100176957 | Photoelectric Smoke Detector - A photoelectric smoke detector may detect presence of smoke by utilizing a light emitting element and a light receiving element whose optical axes intersect with each other. The photoelectric smoke detector may include a casing for storing the light emitting element and the light receiving element. Inlet and outlet ports may be respectively provided in one and the other sides of the casing, the inlet and outlet ports bringing air flow into the casing. Rectifying light blocking means may be provided contiguously with each of the inlet and outlet ports, the rectifying light blocking means preventing entry of disturbance light into an interior space and forming a flow line of smoke extending from one or the other inlet and outlet port to the other or the one inlet and outlet port such that the flow line passes through a detection area by the light emitting element and the light receiving element. | 07-15-2010 |
20100328085 | CIRCUITRY TO MONITOR AND CONTROL SOURCE OF RADIANT ENERGY IN SMOKE DETECTOR - 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. | 12-30-2010 |
20110175741 | Electro/Optical Smoke Analyzer - 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. | 07-21-2011 |
20110260876 | LIGHT RECEIVER DEVICE HAVING A SHIELDING DEVICE EXTENDING ON A BACK SIDE OF A SUBSTRATE - A light receiver device, which is particularly suited for a smoke detector, has a flat substrate, a light receiver mounted on a front side of the substrate, and a shielding device present on at least a back side of the substrate opposite the front side. The shielding device is configured to at least partially shield against electromagnetic interference radiation impinging on the light receiver through the substrate. False alarms are thereby reduced, while the sensitivity of the light receiver is simultaneously increased. The shielding device is formed with a metal strip inserted through the substrate from the front side to the back side, and bent over a recess on the back side provided therefor, so that the light receiver is protected against interference radiation even on the back side. There is also provided an assembly method for producing a light receiver device. | 10-27-2011 |
20120092176 | CALIBRATION OF AN ELECTRO-OPTICAL SIGNAL PATH OF A SENSOR DEVICE BY ONLINE SIGNAL LEVEL MONITORING - 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. | 04-19-2012 |
20120235822 | High Sensitivity and High False Alarm Immunity Optical Smoke Detector - 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. | 09-20-2012 |
20120268281 | Smoke Alarm - 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. | 10-25-2012 |
20130120150 | DANGER DETECTOR FOR OPERATION IN NUCLEAR FIELD, HAVING HEATING SYSTEM FOR HEATING TYPICALLY NON-RADIATION HARDENED SEMICONDUCTOR COMPONENTS TO INCREASE FUNCTIONAL SERVICE LIFE - 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. | 05-16-2013 |
20130176131 | SMOKE DETECTION CIRCUIT, SMOKE DETECTOR COMPRISING SAID CIRCUIT AND ALARM DEVICE COMPRISING BOTH THE CIRCUIT AND THE DETECTOR - 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. | 07-11-2013 |
20130234856 | EVALUATING SCATTERED-LIGHT SIGNALS IN AN OPTICAL HAZARD DETECTOR AND OUTPUTTING A DUST/STEAM WARNING OR A FIRE ALARM - 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. | 09-12-2013 |
20140015680 | PHOTOELECTRIC SMOKE DETECTOR WITH DRIFT COMPENSATION - 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. | 01-16-2014 |
20140015681 | RECREATIONAL SMOKING MONITOR SYSTEM FOR USE IN OCCUPIED SPACES - 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. | 01-16-2014 |
20140197957 | EVALUATION OF SCATTERED-LIGHT SIGNALS IN AN OPTICAL HAZARD ALARM AND OUTPUT BOTH OF A WEIGHTED SMOKE DENSITY SIGNAL AND ALSO OF A WEIGHTED DUST/STEAM DENSITY SIGNAL - A method evaluates two scattered-light signals in a hazard alarm operating in accordance with the scattered light principle. The particles to be detected are irradiated with light in a first wavelength range and with light in a second wavelength range. The light scattered by the particles is converted into a first and second non-normalized scattered light signal. The two scattered light signals are normalized in relation to one another such that their amplitude curve approximately coincides for larger particles such as dust and steam. The two normalized scattered light signals are transformed into a polar angle and a distance as polar coordinates of a polar coordinate system. Finally a respective smoke density signal and a respective dust/steam density signal is formed from a current distance value, wherein for this purpose the respective current distance values, depending on a current polar angle value, are weighted in opposition to one another. | 07-17-2014 |
20140240136 | USE OF OPTICAL REFLECTANCE PROXIMITY DETECTOR FOR NUISANCE MITIGATION IN SMOKE ALARMS - 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. | 08-28-2014 |
20150102934 | SMOKE DETECTOR WITH EXTERNAL SAMPLING VOLUME AND AMBIENT LIGHT REJECTION - In accordance with certain embodiments, a smoke detector determines the presence of smoke particles outside its housing based on measurements of light detected at different wavelengths and corrected based on an ambient light level. | 04-16-2015 |
20150102935 | SMOKE DETECTOR WITH EXTERNAL SAMPLING VOLUME AND AMBIENT LIGHT REJECTION - In accordance with certain embodiments, a smoke detector determines the presence of smoke particles outside its housing based on measurements of light detected at different wavelengths and corrected based on an ambient light level. | 04-16-2015 |
20150123804 | USE OF OPTICAL REFLECTANCE PROXIMITY DETECTOR FOR NUISANCE MITIGATION IN SMOKE ALARMS - Various methods, systems, and devices for identifying a low battery charge of a smoke detector are presented. For example, a device may include a smoke detection sensor that detect smokes and, in response to detecting smoke, generate a smoke detection signal. The device may include battery test circuitry that tests a charge level of a battery installed in the smoke detector device. The device may include an audio output device that outputs a low battery chirp in response to the battery test circuitry determining the charge level of the battery installed in the smoke detector device is low. Also, the device may include a proximity detector that monitors for a wave movement of an object within a distance of the smoke detector device and generates a proximity detection signal when the proximity detector detects the wave movement performed by an object within the distance of the smoke detector device. | 05-07-2015 |
20150371514 | Smoke and Fire Detector - A smoke and/or fire detector for the detection and distance measurement of smoke ( | 12-24-2015 |
20150371515 | CHAMBER-LESS SMOKE SENSOR - A method for detecting smoke via a chamber-less smoke sensor includes applying one or more filters to eliminate a flooding of ambient light upon the smoke sensor and emitting, by a source, light. At least one detector detects at least a portion of the emitted light and a processor processes the detected light to signal an alarm condition when one or more threshold levels are reached. A chamber-less smoke sensor includes a light source configured to emit light and at least one detector configured to detect at least a portion of the emitted light. An electronic filter and/or a processor is configured to apply one or more filters to eliminate a flooding of ambient light upon the smoke sensor and process the detected light to signal an alarm condition when a threshold level is reached. | 12-24-2015 |
20150379846 | Detector With Optical Block - An optical smoke detector includes a radiant energy source and a sensor. The source and sensor are carried by an optical block which provides a fixed orientation therebetween and barriers therebetween. The barriers reduce noise and false alarming due to bugs, dust water vapor and other intrusive elements. The barriers can include V-shaped members at a selective angle relative to center lines of the source and sensor. | 12-31-2015 |