Active Infrared Detection Alarm System In Prison Security Design

The main aspect of thesis research is a infrared alarm the design that the machine is used for a jail safety. Active infrared detector is shot a infrared tranmister,receiver and the infrared alarm controller to constitute.It is placed to receive and tranmist of optical system generally adopt of is optics lens, there is the function to focuse infrared ray beam into thinner parallel light beam to make energy can concentrate transmission.Infrared ray is the unseen spectrum scope of person’s eye, someone passes by this invisible of blockader line, by all means all or part cover infrared ray. the strength of the output’s signal of the receiver will consequently produce variety, so the alarm send out to alarm.Active infrared alarm laying a finger on little animal, leaf, sand dust and rain, snow and fog to cover should not alarm, person or the product of equal physical volume covers to alarm.Because the lay is narrow, receiver and transmiter must be installed to firm and credibility, don’t deserve vibration influence in the ground, otherwise, alarm arouse misinformation.Therefore what active detector probes into is to order a point, not a scope of side.The locator of this way is suitable to become longer to hallways and passage place, and the safe guard of the door, prison bars and high wall of blockader.Initiative infrared alarm technique at the safety in the jail work in of usage mainly in the particular district install on initiative inrfrared invade locator, in order to prevent the person gets into or is forbidden of district.This topic emphases is the design to the infrared alarm detecter, mainly made use of infrared ray to stretch forward, amplifier circuit, voltage compdarator.monostable trigger and alarm circuit etc. Each circuit of design according to the in brief practical principle. All electric circuits design is adopted digital circuit and IC, and the circuit is also more simple in the aspects of creating, the cost is low, s power dissipation is small. The main problem of initiative infrared detector can not identify the living creature body and non-living creature body exercising, as long as we differentiate infrared lay or area coved. It can’t trigger misinformation.