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4195234 |
Infrared intrusion alarm system with temperature responsive threshold level
Intrusion detector of the type in which the presence of an intruder is detected by infrared heat energy emitted by his body. An alarm signal is delivered when the level of radiation detected rises...
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4179691 |
Infrared intrusion detector circuit
A circuit for an infrared intrusion detector comprising a plurality of receiving directions or regions which are separated from one another and a radiation receiver, at the output of which there...
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4173016 |
Interpersonal-introduction signalling system
An interpersonal-introduction signalling system includes a receiving and transmitting transceiver having a relatively short range response and of such size as to permit convenient carrying by a...
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4159473 |
Charge sensitive switch
A charge-sensitive switch is described sensitive to the adjacency of, or transfer of charge from a person, for controlling lamps, appliances, motors, etc. The switch contains an over-current sensor...
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4057805 |
Radio-controlled machine power cut-off
A pair of battery-powered radio transmitters are individually worn on the wrists of a machine operator, and two radio receivers are tuned to receive the signals broadcast by the radio transmitters,...
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4052716 |
Fire and intruder detection and alarm apparatus
Improved apparatus is provided for monitoring a space under surveillance, for detecting the existence of a fire, the presence of an intruder or the occurrence of other abnormal conditions, and for...
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4038633 |
Detection system for automobiles and other motor-driven objects
A system for detecting the presence of motor-driven vehicles or other objects which are motor-driven includes a sensor for detecting the presence of a changing magnetic field generated by operation...
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3988726 |
Infrared intrusion detection apparatus
The infrared system employs an optical focusing arrangement for collecting radiation from a moving object such as an intruder and directing the energy to a sensing element which may be a thermistor...
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3972598 |
Multifaceted mirror structure for infrared radiation detector
Infrared radiation can be gathered from a number of discrete, spaced apart fields of view and focused on a single sensing element with a multifaceted mirror. Each facet of the mirror is a concave...
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3958118 |
Intrusion detection devices employing multiple scan zones
This invention relates to intrusion detection devices, and in one embodiment includes an array of infra-red detectors with associated means for selectively increasing the number of scan zones which...
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3955184 |
Passive infrared room intrusion detector
An intrusion system detects changes in background radiation received from a plurality of orthogonally arranged fields of view (FOV) which preferably are defined by thin polyhedrons coextensive with...
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3928849 |
Intrusion detector self-test system
An intrusion detection system which automatically makes periodic tests of the operability of the system and provides an alarm in the event of a malfunction during the supervisory self-check regimen...
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3928843 |
Dual channel infrared intrusion alarm system
An infrared intrusion alarm system utilizes two sensing elements and two signal processing channels arranged such that an intruder produces signals of opposite polarities in the two channels. An...
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3924130 |
Body exposure indicator
An infra-red detector is caused to scan a field of view periodically to dct warm bodied intruders or other personnel. Signals from the detector are compared with signals from a scene recorder...
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3812483 |
POINT SOURCE DISCRIMINATOR THERMAL ALARM
An alarm system is provided for a scanning type far infrared system. The eo signal is processed by a gated pulse blanking system which permits automatic surveillance of one or more windows within...
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3766539 |
AUTOMATIC PERSONNEL INTRUSION ALARM
The invention is concerned with infrared viewing systems, particularly th operating in the spectral wavelength regions between 3 to 5 and 8 to 14 microns. An alarm is provided for these systems to...
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3760399 |
INTRUSION DETECTOR
A simple optical system collects and applies radiation from a predetermined field of view onto a thermopile detector. The thermopile detector has a plurality of rows of thermocouples having all...
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3703718 |
INFRARED INTRUSION DETECTOR SYSTEM
Infrared intrusion detector system utilizing a single sensing element and optical means for focusing radiation from one or more discrete fields of view onto the sensing element. An amplifier tuned...
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3656161 |
MAINTAINING A CIRCULARLY POLARIZED MAGNETIC FIELD AT A MOVING POINT
A circularly polarized magnetic field is maintained at the location of a subsoil penetrator traveling beneath a dipole-quadrupole field propagating antenna which serves as a reference frame with...
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3631434 |
PASSIVE INTRUSION DETECTOR
A passive intrusion detector is described with two stationary detectors or detector elements arranged side by side and stationary optics which image a target onto the plane of the detector. The...
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3597680 |
METHOD AND APPARATUS UTILIZING A TRANSMITTER AND RECEIVER FOR DETECTING THE PRESENCE OF A METALLIC OBJECT WITHIN A PIPE
A method and apparatus for exploring an installed, concealed pipe to obtain information such as the location and coarse thereof, and the presence and position of a metallic object lodged therein....
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3577079 |
WATCHMAN'S RADIO LOCATION INDICATING SYSTEM
In a location system a radio transmitter carried by a security guard or watchman has a modulator and an oscillator, but without the frequency determining components. At various points which the...
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3573620 |
SECURITY SYSTEM WITH INDUCTIVE TO RF COMMUNICATIONS LINKS
In a location system a radio transmitter carried by a security guard or watchman includes a loop aerial and a loop demodulator, and loop carrier frequency generators each generating a loop carrier...
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3524180 |
PASSIVE INTRUSION DETECTING SYSTEM
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3480775 |
RADIATION SENSITIVE OMNIDIRECTIONAL MOTION DETECTOR SYSTEM
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3278932 |
Infrared system audio augmentation circuit
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3264646 |
Passive perimeter intrusion detection system
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3192506 |
Electronic indicator system more particularly for use in mines
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3056106 |
Infrared detectors
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2991458 |
Ignition interference alarm
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2908897 |
Intrusion detecting system
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2814032 |
Protective apparatus for materialhandling equipment
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2810902 |
Fire and intrusion detector system
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2795778 |
Tow target
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3560950 |
Title is not available
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