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5308985 Wide-angle passive infrared radiation detector  
An infrared radiation detector using a reflector comprising a mirrored conic section or faceted reflector to increase the field of view of a sensor. The reflector is mounted in the normal field of...
5308984 Method of operating a dual mode tracking system  
A method of processing IR signals from a repetitively scanned array of photovoltaic cells is shown to consist of the steps of: (a) subtracting IR signals received on successive scans to produce...
5302830 Method for measuring thermal differences in infrared emissions from micro devices  
A method for measuring thermal differences in infrared emissions from semiconductors, the method utilizing an image sensor including an array detector having a plurality of detector elements which...
5300780 Missile surveillance method and apparatus  
Multispectral signature analysis techniques are used to reliably separate a missile electro-optical signal from a background. The system provides higher reliability and reduced complexity when...
5296707 Apparatus for detecting movement of heat source  
In order to detect the movement of a heat source over a widened range by using a reduced number of pyroelectric type infrared sensors, a sensor section includes two infrared detecting means X and...
5291020 Method and apparatus for detecting direction and speed using PIR sensor  
A dual pyroelectric-effect sensor having the sensing elements aligned in a motion plane permits direction determinations to be made for moving IR sources. Dual sensing-element PIR sensors provide...
5283551 Intrusion alarm system  
A passive intrusion alarm system having an array of infrared sensing elements arranged and sampled so as to provide a two dimensional thermographic image of an intruder.
5282013 Passive ranging technique for infrared search and track (IRST) systems  
In an IRST system, a determination of the range and type of a detected target may be made as follows. Atmospheric transmittance and background spectral radiance is estimated from available...
5266807 Passive infrared detection system  
The present invention teaches an improved passive infrared detection system for use in controlling electrical wiring devices and systems in residential, commercial and industrial environments....
5262647 Infrared detector with pyroelectric detector element and chopper control circuit  
An infrared detector with a pyroelectric detector element and an AC amplifier has a chopper control circuit that enables the detector to sense either a moving person or temperature. When used to...
5258824 In-situ measurement of a thin film deposited on a wafer  
A method and apparatus is used to determine the thickness of a layer deposited on a specimen. For example, the thickness of a layer of polycrystalline may be measured as it is deposited over...
5250809 Method and device for checking joint of electronic component  
A method and device for checking a joint of an electronic component is arranged to apply heat energy to a joint containing a heat conductive material and receive the infrared ray radiated from...
5243326 Device for protecting components of security systems against obstruction  
An element of an intrusion-alarm system, for example a passive infra-red sensor, has two subsystems which protect it against obstruction. The first subsystem can detect attempts at obstruction by...
5239860 Sensor for measuring alcohol content of alcohol/gasoline fuel mixtures  
An alcohol sensing device is provided for determination of the alcohol content within an alcohol/gasoline fuel mixture which is being provided for the operation of an internal combustion engine....
5227632 Optical radiation detector with wide field-of-view  
An optical radiation detector utilizes a unitary V-shaped or conical reflector element located within an internal cavity of an optically transmissive capped housing to provide a 180° cylindrical...
5221919 Room occupancy sensor, lens and method of lens fabrication  
Apparatus for sensing occupancy of a room detects the infrared energy that is radiated by persons and may be used actuate any of a variety of devices such as electric lights, heating systems, air...
5218345 Apparatus for wide-area fire detection  
In fire detector apparatus for monitoring an extended area from an elevated location, and especially for detecting forest fires, a scanning assembly (1) has azimuthal freedom of movement. A row of...
5212384 System for detecting a hot spot in an infra-red detected landscape  
A system for detecting a hot spot in an infra-red detected landscape and which co-operates with a landscape scan system for converging towards an infra-red detector circuit a main beam emanating...
5208528 Method for inspecting a populated printed circuit board, particularly for inspecting solder joints on the board and a system for working this method  
The invention relates to a method for inspecting a populated printed circuit board, particularly for inspecting the solder joints on the board, and advantageously usable for boards populated with...
5200624 Wide-angle radiant energy detector  
A wide angle passive infrared energy sensor includes an infrared transducer. Energy in the field of view which is essentially normal to the transducer impinges directly on the transducer which can...
5178023 Method and apparatus for sealing a packaging container overpressure valve  
For sealing off overpressure valves of packaging containers, a small quantity of liquid sealant is introduced into a valve. To check whether such valve has been equipped with sealant, the sealant...
5168321 Doped-germanium sensor for use in a system to control the alignment of a CO2 laser beam  
A photoconductive sensor responsive to a CO2 laser beam. The sensor comprises a silver-doped germanium semiconductor. The silver dopant changes the conductive characteristics of the semiconductor...
5162658 Thermal detection arrangement having a plurality of optical filter devices  
A thermal detector arrangement includes a number of channels, each including a collimator for collimating incident radiation to a respective optical filter. Each optical filter has a respective...
5160842 Infrared fire-perimeter mapping  
A fire-perimeter, temperature-differentiating mapping system for creating a temperature-level-differentiated, visually readable outline of a ground fire, which outline is suitable for in-scale...
5159200 Detector for sensing hot spots and fires in a region  
A detector for detecting hot spots that includes an infrared sensor and a scanning component. The infrared sensor is fixedly mounted on a housing and is oriented to have a field of view of at...
5149025 Detection of overheated railroad wheel and axle components  
Overheated railroad journal bearings, wheels, and other wheel components on a moving or stationary railroad train are detected by amplifying the current signal from an infrared radiation sensor...
5142150 Horizon sensor for satellites using superconductor(s) having a high critical temperature  
A horizon sensor for spaced-based satellites consisting of a high critical temperature superconductor which changes temperature based upon its exposure to space-based radiation. The horizon sensor...
5134292 Moving object detector and moving object detecting system  
Infrared rays radiated from a moving object is converged into a plurality of infrared ray detectors by optical system. Detecting area is instituted by the optical system so as to put the infrared...
5130543 Direction sensitive energy detecting apparatus  
A direction sensitive energy detecting apparatus characterized by having a pair of energy receiving and transmitting devices of different polar characteristics and so disposed that they define...
5127604 Optical system  
An optical system focuses a portion of electromagnetic energy into a spot on a focal plane and rotates the focused spot about an optic axis. A plurality of detectors is disposed in a detector...
5128654 Preset light controller including infrared sensor operable in multiple modes  
A junction box mounted infrared motion detector is set forth. It incorporates push button controls mounted on a box which has a Fresnel lens looking into the immediate vicinity and which encloses...
5126718 Intrusion detection system  
An intrusion detection system includes an array of infrared radiation-sensitive elements, each element comprises first and second spaced electrodes between which pyroelectric material is...
5124546 Method and apparatus for refracting light to an optical detector  
A method and apparatus for refracting light into the field of view of an optical detector without the use of mirrors. The invention avoids an out-of-focus problem caused by the increase in the...
5119069 Apparatus and method for locating boundaries of detection zones covered by a passive infrared detection system  
An audio indicator apparatus for locating boundaries of optically divided detection zones covered by a passive infrared detection system having a collector for collecting infrared rays from the...
5110365 Control of furnace cleaning for reflective ash using infrared imaging  
A method and apparatus for monitoring reflective ash deposited on a furnace wall to be cleaned, comprises an infrared video camera or other mechanism for taking an infrared image of the furnace...
5111048 Apparatus and method for detecting fatigue cracks using infrared thermography  
A method and apparatus for detecting a defect in a workpiece are disclosed. The workpiece is positioned with a surface of the workpiece to be inspected in an optical path of an infrared radiation...
5107120 Passive infrared detector  
A passive infrared detector, including a pyroelectric sensor with three pairs of contiguous, active elements and a Fresnel lens with a plurality of segments each of which has an optical center and...
5107117 Optoelectronic viewing system  
An optoelectronic viewing system for imaging a field of view on a monitor includes a telescope for generating an optical image of the field of view, a scanning device for electronically scanning...
RE33857 Imaging of hot infrared emitting surfaces obscured by particulate fume and hot gases  
An apparatus is described which is capable of producing an image of a smelt bed of inorganic chemicals collected at the bottom of a kraft pulp recovery boiler. The image produced is free of...
5096502 Advanced water lance control system based on peak furnace wall emissivity  
A method and apparatus for controlling the operation of a water lance for water cleaning a furnace wall comprises a sensor or calculation equipment to derive the furnace wall emissivity and...
5094695 Furnace cleanliness monitor for high reflectivity ash  
A method and apparatus of initiating and terminating the cleaning of a furnace wall to remove reflective ash which been deposited thereon, comprises a video or infrared monitor which monitors the...
5093574 Infrared sensor for short range detection wherein the sun may be in the field of view of the detector  
An infrared sensor for short range detection of aircraft wherein the sensor is designed to operate with the sun in the field of view yet still be able to track its target. The sensor operates on a...
5091637 Noise reducing infrared reticle/detector arrangement  
The electronic simplicity of a rotating-telescope target acquisition device and the noise immunity and wide field of view of a non-rotating array device are combined in an assembly (10) using a...
5091648 Radiation detection arrangements and methods  
An intruder detection system employs two infra-red sensors 5,60 within the same housing 4. Both sensors have substantially the same field of view 6 and one 5 of the sensors detects an intruder by...
5089704 Wide angle ceiling mounted passive infrared intrusion detection system  
A ceiling mounted infrared intrusion detection system achieves 360-degree viewing capability by employing concentric rings of mirrors arranged to view multiple segments within an annular volume of...
5089700 Apparatus for infrared imaging inspections  
A method of nondestructively identifying regions "R" of high density in a substrate (10) of a bonded matrix of carbon fibers by resistively heating the substrate and taking an infrared image of...
5083025 Passive infrared motion indicator  
A passive infrared motion indicator installed at a distance above the ground includes a housing having at least one housing recess formed therein. A Fresnel lens system is disposed in the at least...
5079419 Horizon sensor compensation for radiance variations  
A horizon sensor scans an infrared detector over the earth's horizon generating first (A) and second (B) signals of finite pulse width representing radiation from the fields of view of the...
5077549 Integrating passive infrared intrusion detector  
In a passive infrared intrusion detection system, a signal responsive to infrared radiation received from optically divided zones of an area to be monitored is integrated to produce an integral...
5068537 Passenger number sensor system  
A passenger-number sensor system wherein a plurality of infrared ray sensors are disposed on a straight line to detect temperature changes in their light reception zones, a plurality of optical...