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4614426 Passive target detector  
Passive target detectors which employ infra-red sensors may have difficulty in distinguishing between a cool target near the detector and a warmer one further away.A detector detects a source of...
4612442 Passive infrared intrusion detection system  
A passive infrared intrusion detector has: a multi-faceted parabolic reflector for dividing a target controlled area into a plurality of optically divided detection zones, for collecting infrared...
4612441 Moving object detection system using infrared scanning  
An infrared moving object detection system comprising first and second inred detectors and an optical scanning system mounted in an aircraft for scanning along first and second paths on the...
4606600 Passive infrared movement detector  
In a passive infrared movement detector having a reflector which directs the radiation from a plurality of fields of vision to an infrared detector arrangement and for this purpose consists of a...
4603255 Fire and explosion protection system  
A fire or explosion detection system is disclosed for reliably discriminating between a hydrocarbon fire in an armored vehicle and other sources of radiant energy including explosion of an...
4580908 Thermometer for coke oven chamber walls  
Optical quotient thermometers are disposed on the operative end of pusher rods used to push coke from coke oven chambers. The actual value of the optical quotient temperature is measured by the...
4575633 Pyroelectric infrared radiation detector  
An infrared radiation detector for an intruder alarm has a pyroelectric element comprising a pyroelectric body sandwiched between two electrodes. The element is supported above a header by two...
4566808 Scanning radiation detector  
A radiation detector includes a flat housing 14 having a radiation sensor 16 at one end thereof and a bar graph display 18 at the other end thereof. The bar graph display provides an indication of...
4564761 Method and apparatus for the enhanced detection of a component of a material  
A method and apparatus for the enhanced detection of a component in the base material of a sample, particularly of a semiconducting base material having traces of at least one dopant therein to be...
4560874 Reference channel for sensing optical contamination  
A simple lightweight apparatus for sensing excessive contamination on the faces of an array of light or infrared detectors comprises mounting a light or infrared-emitting diode near one or more of...
4559819 Selecting the cut-off end portion of rolled sheet stock  
The method as described is an attempt to minimize the length of the sheet stock to be cut off at the end of rolled stock as waste. This minimizing should be carried out on-line, and it is...
4551711 Infrared-type intrusion detector  
An infrared-type intrusion detector for monitoring the presence of a person is disclosed. The detector has a plurality of concave reflector segments for defining separate fields of view. Infrared...
4549078 Automatic tracking system with infrared and ultraviolet detection  
An automatic tracking system for tracking the sun on a path across the sky, comprising a reflector, a pre-programmed, automatic timed drive mechanism connected to the reflector for driving it on a...
4535240 Intruder detection  
The invention relates to an intruder detector for use in a burglary in which infra-red radiation is imaged onto a sensor 16. The imaging system, which serves to divide the area of surveillance...
4523095 Radiation detector with asymmetrical pattern  
A radiation detector having a plurality of discrete fields of view with respect to a plurality of sensing elements. The sensing elements are connected such that their output signals are summed to...
4516027 Infrared detector  
Contactlessly operating detectors which are accommodated in a casing provided with a window and which exploit the pyroelectric effect (FIG. 1) are being increasingly used for radiation and...
4515471 Scanning laser radar  
In an optical radar system a coherent signal is transmitted at a variable position and the return signal, that is, the reflected portion of the coherent signal is received and coherently detected....
4515472 Agile receiver for a scanning laser radar  
In an optical radar system a coherent signal is transmitted at a variable position and the return signal, that is, the reflected portion of the coherent signal is received and coherently detected....
4514631 Optical system for ceiling mounted passive infrared sensor  
A ceiling mountable passive infrared intrusion detection system is disclosed having a mirror assembly providing a first protective curtain which is relatively narrow in the horizontal plane and...
4514630 Optical system for intruder detecting device  
An optical system for an intruder detector which employs an infrared ray detecting element and a parabolic mirror above the infrared detecting element for collecting infrared rays from a detection...
4513201 Thermocouple detector  
An apparatus for determining the direction of orientation of pulsed sources includes a detector having two rectangular arrays of thermocouple strips fixed to opposite surfaces of a substrate....
4497373 Fire and explosion detection and suppression  
The invention discriminates between the explosion of an ammunition round itself and the fire or explosion (e.g. a hydrocarbon fire) which may then take place in the object (e.g. a vehicle) struck...
4496833 Detection process and apparatus  
1. Apparatus for locating a target which radiates or reflects electromagnetic energy comprising a circular-scan cathode-ray tube including a screen and an electron beam moving over said screen,...
4495416 Remote sensing instrument  
A hand-held, battery powered instrument for the determination and recording of the intensity of radiation emitted or reflected by a target in the field in spectral bands from 400 nm to 12...
4491290 Train defect detecting and enunciating system  
A train monitoring system for detecting hot boxes, dragging equipment and the like at the rail site, determining the location on the train of a monitored defect and annunciating the defect and...
4486662 Switch-while-scan optical system  
An optical system produces sensor data from at least two fields of view (which may be centered differently) in a sequence selected to satisfy two simultaneous functions of the sensor.
4486661 Wall mountable modular snap-together passive infrared detector assembly  
A snap-together, passive infrared detector assembly includes a modular passive infrared detector sub-assembly defining an optical cavity. In one embodiment, the passive infrared detector...
4485305 Infrared detector with vibrating chopper  
An infrared ray detector comprising an infrared ray detecting body, a pair of opposing portions, a bimorph vibrator connected to the pair of opposing portions for intermitting infrared rays...
4481418 Fiber optic scanning system for laser/thermal inspection  
An apparatus for inspecting a device made up of a plurality of different infrared radiating elements includes an optical head which is moveable along X-Y coordinates above the fixed device to...
4470151 Image motion and distortion stabilization for predetection scene information processing sensors  
The specification discloses a method and apparatus for stabilizing images in the reference frame of a forward or down looking infrared receiver moving relative to the scene. An infrared modulator...
4467202 Photoelectric detector  
The photoelectric detector contains a photosensor or light-sensing element of a pyroelectric polymer film interposed by two disturbance-preventive chambers such that the two disturbance-preventive...
4460829 Infrared intrusion detector with response indicator light  
In a passive infrared intrusion detector there is provided an alarm indicator light with a light conduit for providing the emitted light to an opening on the wall of the detector. The end of the...
4451733 Infrared intrusion detector with optical pattern locators  
A passive infrared intrusion sensor is provided with a cover which can be mounted in a closed or partially open position. In the partially open position a tamper switch is activated to illuminate...
4451734 Infrared intrusion sensor with selectable radiation patterns  
A passive infrared intrusion detector is provided with a lens having selectable patterns of sensitivity. The lens unit can be mounted to the detector in two orientations to provide two different...
4448661 Device for measuring the bath temperature in a fused salt electrolytic cell used for the production of aluminum  
The temperature measuring device comprises a rod which passes approximately vertically through the anode block and terminates at the level of the working face of the anode. Fitted over the rod at...
4447726 Passive infrared intrusion detector  
A passive infrared intrusion detector is provided of the type having an infrared sensor for detecting a change in temperature in the field of view of the sensor caused by an intruder moving...
4445034 Compound infrared detector  
A compound infrared detector, having a thermopile detector which is constructed on one face of a pyroelectric insulating thin film and a pyroelectric detector which is constructed by installing...
4442359 Multiple field-of-view optical system  
Disclosed herein is a multiple field-of-view optical system which is adapted for use in electromagnetic radiation-responsive systems, e.g. in passive infrared intruder detection systems. The...
4441023 High output differential pyroelectric sensor  
A dual pyroelectric crystal sensor suitable for infrared intruder alarms and the like having two separate closely spaced identical pyroelectric crystal detectors connected in parallel opposition....
4437003 Differential pyroelectric sensor with static discharge  
A dual pyroelectric crystal sensor, connected electrically in series opposition to provide ambient temperature compensation, drives a single ended amplifier. The load resistor for the sensor is a...
4437002 Pyroelectric infrared sensor  
A pyroelectric infrared sensor for use in intrusion alarm systems, including a pyroelectric ceramic element provided with two pairs of electrodes, of which the front electrodes are so configured...
4435093 Pyrometer with sighting window cleanliness monitor  
Coke guide and coke oven infrared pyrometer degrading is minimized to continuously permit better accuracy and reliability in hostile environment of coke mass and heat, dust and/or dirt present in...
4434368 Method of measuring the reducing power of gases over the charge in a blast furnace  
The reducing power of gases liberated at the top of the charge of an industrial furnace is determined by a method wherein the energy radiated from the charge in the range, for example between 1...
4429224 Optical arrangement for an infrared intrusion detector  
The optical arrangement for an infrared intrusion detector containing a plurality of separate radiation receiving regions or fields of view is provided with a first focussing optic or optical...
4429223 Infrared intrusion detector  
An infrared intrusion detector wherein a plurality of separate radiation receiving regions or fields of view are focused by a single focusing optic, for instance a reflector or a Fresnel lens upon...
4421981 Method and apparatus for conducting remote surveys of the earth's crust  
The present invention concerns a method for remotely surveying the earth's surface. The method comprises the steps of advancing a plurality of electromagnetic scanning devices (3) along a known...
4404468 Pyrodetector  
A pyrodetector is disclosed which has a sharply limited directional range of detection sensitivity for the detection of a body entering into its directional range at a distance from the detector,...
4386275 Apparatus and method for detecting the presence of a heat-emitting body  
An apparatus and method for detecting the presence of a heat emitting body within a region provides for the mounting of a cylindrical shroud having an apertured circumference within the fields of...
4379971 Pyroelectric sensor  
An improved, selective, radiation sensing device is provided which includes a thin strip of pyroelectric material. One side of the material is coated with a continuous layer of metallic material...
4375034 Passive infrared intrusion detection system  
A passive infrared intrusion detection system having a mirror assembly providing a protective curtain which is relatively narrow in the horizontal plane and which substantially encompasses the...