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False alarms from flying birds, leaves and the like, are thereby minimized. The circuitry also discriminates with respect to man parameters, such as man''s usual forward velocity, namely, approximately 1/2 feet per second to 10 feet per second. Detection of animals, such as dogs, is negated by logic circuitry affording height discrimination. The two line of sight beams are displaced horizontally and vertically from each other and by orienting the beams along a perimeter to be protected, any invasion of the perimeter is sensed by interruption of the beams. The (laser) beams are intercepted by corresponding receiving stations. G08B13/183- Actuation by interference with heat, light, or radiation of shorter wavelength Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrierįirst and second transmitting stations provide two, parallel, line-of-sight, pulsed beams of infrared energy generated from a solid state source.G08B13/181- Actuation by interference with heat, light, or radiation of shorter wavelength Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems.G08B13/18- Actuation by interference with heat, light, or radiation of shorter wavelength Actuation by intruding sources of heat, light, or radiation of shorter wavelength.G08B13/00- Burglar, theft or intruder alarms.
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230000029578 entry into host Effects 0.000 claims abstract description 6.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by California Crime Technological Research Foundation filed Critical California Crime Technological Research Foundation Priority to US00299456A priority Critical patent/US3825916A/en Application granted granted Critical Publication of US3825916A publication Critical patent/US3825916A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Original Assignee California Crime Technological Research Foundation Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)Ĭalifornia Crime Technological Research Foundation Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US00299456A Inventor R Steele D Roudabush Current Assignee (The listed assignees may be inaccurate.
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Google Patents US3825916A - Laser fenceĭownload PDF Info Publication number US3825916A US3825916A US00299456A US29945672A US3825916A US 3825916 A US3825916 A US 3825916A US 00299456 A US00299456 A US 00299456A US 29945672 A US29945672 A US 29945672A US 3825916 A US3825916 A US 3825916A Authority US United States Prior art keywords line sight laser beam beams man Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.