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4752768 Intruder detector with anti-obscuring means  
An apparatus for detecting intruders comprising a housing provided with at least one window, a passive infrared detector (for detecting the radiation emitted by an intruder around a wavelength...
4752769 Infrared motion alarm  
The invention is directed to an infrared motion alarm characterized by an infrared detector and an optical arrangement before the detector in the radiation direction for focussing the infrared...
4751388 Sensor element in a retaining frame for a pyrodetector and method for the manufacture thereof  
A sensor element arrangement for a pyrodetector has a concave mirror with a sensor element arranged at a focus of the concave mirror and further sensor elements arranged laterally therefrom....
4749862 Scanning fire-monitoring system  
A scanning fire-monitoring system comprising a fire source detecting apparatus including a detecting head having a small field of vision and adapted to detect heat radiant energy from a monitoring...
4745284 Infrared ray detector  
A pyroelectric infrared ray detector of the so-called dual structure for detecting an intruder or the like through differential output of two pyroelectric infrared ray detecting elements connected...
4740701 Infrared intrusion detector  
An intrusion detector evaluates the infrared radiation emitted by an intruder within a closely defined zone or area by means of a virtual protective curtain. Uniform sensitivity independent of...
4737028 Target loop active boresighting device  
The invention disclosed here is a sensor comprised of a laser designator, a and block filter and a two-dimensional sensor that can "see" the target in one band and the designator in another band,...
4734585 Passive infra-red sensor  
A passive infra-red sensor includes a window in a housing which also houses an infra-red detector. The window defines a plurality of infra-red transmitting strips which are separated by Fresnel...
4733961 Amplifier for integrated laser/FLIR rangefinder  
An integrated laser/FLIR rangefinder has a laser energy detector generating an electrical signal in response to impinging laser energy, a preamplifier for amplifying the signal and a post...
4730113 Safety system for a laser-utility facility  
A safety system for a laser-beam utilizing facility incorporates a safety enclosure (24) and an infra-red monitoring system (32) for detecting the development of hot spots at internal surfaces of...
4728794 Radiation sensing arrangements  
A fire or explosion detection arrangement has a housing with first and second adjacent radiation-transmitting windows. The first window includes a filter having a passband corresponding to a...
4728795 Optical target detection systems  
The invention provides an infra-red target detection system in which an array of infra-red detectors is scanned vertically in swathes and horizontal scanning is effected by sampling the output of...
4717821 Flat wide-angle lens array with a common focus  
Array of Fresnel lenses moulded in a single sheet of plastic 29 are used in conjunction with a thermal radiation detector 1 to provide intruder alarm apparatus. Each lens defines one detection...
4716294 Pyrodetector for the detection of a body entering into its detection area  
A pyrodetector having a concave mirror containing a sensor element arranged in a focus thereof. The sensor element is on a film and is distinguished by a compact structure. The concave mirror is...
4713544 Optical system for the simultaneous reception of thermal and laser radiation  
An optical receiving system for thermal radiation is useable, with slight modification, for the simultaneous, low-loss reception of laser radiation and is nevertheless still composed of standard,...
4710629 Infrared intrusion detector  
In an infrared intrusion detector which evaluates the body radiation of an intruder by means of a dual radiation sensor having two sensor elements arranged in a differential circuit for emitting...
4709151 Steerable mirror assembly and cooperative housing for a passive infrared intrusion detection system  
The disclosed steerable mirror assembly and cooperative housing for a ceiling mountable passive infrared intrusion detection system of the present invention includes first and second relatively...
4709153 Intruder detector  
To monitor that infra-red radiation element 22 within housing 10 has not been disarmed, for instance by rendering opaque an infra-red transparent element 16 masking a window 12, in the housing 10,...
4707604 Ceiling mountable passive infrared intrusion detection system  
The disclosed ceiling mountable passive infrared intrusion detection system includes a field forming mirror assembly and a focusing mirror assembly cooperative to provide a field of view having...
4705946 Infrared sensor comprising improved feedback limited amplifier and associated method for amplifying electronic signals  
An improved infrared sensor is provided which is of the type which scans across a spatial region and detects infrared energy radiating from a celestial body and in which an input electronic signal...
4704533 Infrared intruder detection system  
An infrared intruder detection system has two separate channels A and B. Each channel has its own pyroelectric detector device and threshold level comparator. The comparator is responsive to dual...
4697081 Infra-red radiation detector devices  
An infrared radiation detector device, for example, for an intruder alarm, comprises two dual detectors. Each dual detector constitutes a separate detection channel and has two pyroelectric...
4694172 Detection of fires and explosions  
A radiation-responsive system is described for measuring the distance to a fire. A radiation detector produces an output I1 dependent on the intensity of radiation received in a narrow wavelength...
4692619 Pyroelectric type detecting device  
A pyroelectric type detecting device including a converging mirror, a pyroelectric type sensor element for detecting light converged by the converging mirror, an amplifier for amplifying an output...
4691104 One-dimensional pyroelectric sensor array  
A one-dimensional pyroelectric sensor array comprises (1) a base plate made of a pyroelectric material; a plurality of strip elements made of pyroelectric material having a heat-sensitive region...
4691105 Thermal energy proximity detector  
A proximity sensor comprising a thermal detector responding to the rate of change of a thermal input and connected to circuitry for performing a control function when the detector output becomes...
4689486 Folded optical system for radiation detection device  
A folded modular optical system adapted for use, for example, in a passive infrared intruder detection device for directing radiation from a plurality of discrete fields of view onto a...
4684804 Method and apparatus for processing the output signals of an optical earth-horizon sensor operating in the infrared range of an orbiting earth satellite  
A method and an apparatus for processing the output signals of an optical rth-horizon sensor (1) operating in the infrared range of an orbiting, e.g. stationary earth satellite with respect to...
4677294 Self-calibrating radiation sensors and control for radiation sensors  
Self-calibrating radiation detection apparatus comprising a detector element and calibration apparatus for maintaining a generally constant response of the detector element to a predetermined...
4671362 Automatic fire extinguisher with infrared ray responsive type fire detector  
An automatic fire extinguisher wherein a fire detector receives infrared rays from started fire flame in detecting area at one of many light receiving elements which corresponds to the ray's...
4672205 Method of processing the output signals of an optical earth-horizon sensor  
The invention is directed to a method for determining the anomaly portion the output signal of a zero-seeking earth-horizon sensor for a geostationary satellite. The horizon sensor comprises a...
4672206 Passive infrared detector  
A passive infrared detector including an optical collector releasably attached to a base with a sensor on which incident infrared radiation directed through the optical collector is focused. The...
4670655 Alarm apparatus for spatial surveillance  
An alarm system for the surveillance of space, with at least one sensor of electromagnetic, in particular infrared radiation, located on the closed inner frontal surface of a rectangular tube...
4667104 Method and apparatus for deriving an off-course signal for an orbiting earth seatellite by means of an earth-horizon sensor  
A method and apparatus for deriving an off-course signal for an orbiting th satellite, preferably a geostationary satellite, by an earth-horizon sensor. The earth-horizon sensor operates in the...
4665314 Method and circuit for processing the signals of an earth-horizon sensor in an earth satellite  
A method and a circuit for processing the signals of an earth-horizon sen of a circularly orbiting earth satellite. The earth-horizon sensor operates in the infrared range and includes, in the...
4655607 High speed hot air leak sensor  
A hot air leak sensor for sensing jet engine bleed air leaks in an aircraft. Infrared detectors are combined with thermal re-radiating elements which are installed in air passages adjacent to the...
4647776 Discriminating fire sensor with thermal override capability  
A fire sensor apparatus of the type having a discriminating fire sensor portion for detecting radiation in at least two different spectral bands associated with a fire and for providing an output...
4645930 Motion detector  
A motion detector of the space surveillance type wherein an elongate box has parallel walls and an aperture opening toward sensors, and a pair of upwardly divergent reflectors is provided for at...
4644164 Compact passive infrared intrusion sensor  
A compact passive infrared detector is provided with a plane mirror which reflects infrared radiation focused by a lens onto a detector arranged between the lens and the reflector.
4644147 Method for deflection of optical rays and an optical arrangement therefor  
A method and apparatus is shown for receiving optical rays with a maximum angle of sensitivity so that a single detector can monitor a wide, spherical angle. This method is used with infrared...
4642454 Infrared intrusion detector with field of view locator  
Passive infrared intrusion detector with means for determining the location of the fields of view covered by the system. In one disclosed embodiment, a small mirror is positioned near the sensing...
4640627 Apparatus for monitoring a plasma torch  
An apparatus for monitoring a plasma torch includes a dedicated photometer which produces a signal representative of the temperature of a quartz tube of the torch, which signal can be used to...
4636091 Radiation detector having temperature readout  
A hand held radiation detector may be used for scanning of a surface from a distance to obtain a gross indication of temperature variations in the surface. The radiation detector is provided with...
4627724 Radiation scanning and detection system  
A source of radiation is detected by an optical scanning system including a otating mirror and an array of V-shaped detector elements. The detectors are arranged in vertically stacked pairs in a...
4626685 Multispectral collimator with built-in-test  
A multispectral collimator for testing and verifying electro-optical and opto-mechanical parameters of a forward looking infrared receiver, laser receiver, laser transmitter and the like. The...
4626686 Variable field of view heat scanner  
A hand held radiation detector is adapted for scanning the subject while a bar graph at one end of the detector is observed. The field of view of the radiation detector is variable by means of...
4625113 Motion detector having sensing means which determine the shape of the field of sensitivity  
A motion detector with at least one sensor to receive electromagnetic radiation, in particular in the infrared range, from a radiation receiver surrounding a monitored object at least partially,...
4618854 Double eye type crime preventing sensor system  
A double eye type crime preventing sensor system comprising a pair of detection axes (6) substantially horizontally spaced apart and extending in substantially the same direction in a...
4618770 Electrical controller having a window discriminator  
An electrical control has a detector which senses the infrared radiation within a given area. A pair of comparators function as a window discriminator. A voltage divider provides reference bias...
4617463 Segmented optical system for an alarm system  
A segmented optical system for use in an alarm system. A plurality of optical elements such as mirrors are arranged so that each of them directs radiation from a predetermined direction towards a...