Based On Thermal Imaging Temperature Measuring Principle Body Temperature Screening Key Technology Research

In the last 20 years,IR (infrared) thermometer has been widely used in military, industrial and commercial fields because of the non-contact, rapid response, d ynamic t emperature a nd ot her advantages .With th e development o f i nfrared i maging t echnology, especially infrared focal pl an array (IRFPA) solid image detectors, the infrared temperature measurement system h as b een d eveloped, w hich can s how t he i nfrared t hermal i mage. However, t he l ow accuracy of i nfrared t emperature m easurement d irectly limits its application in a wider scope.This t hesis m ainly r eviews t he d evelopment hi story and t rends of Infrared t emperature m easurement t echnology and i nfrared i mager, summarizes and an alyzes the p rinciple of t he i nfrared t emperature measurement and t he i nfrared i maging s ystem; t he t emperature general formulas of i nfrared i mager h ave b een deduced a ccording t o analyzing radiation that is actually received by infrared thermal imager. On the basis of previous c alibration, a n i nfrared hum an-body temperature s creening s ystem based on e xternal bl ackbody is designed, by which, Infrared i maging temperature measurement will be employed effectively in health and epidemic prevention system.In the thesis, primary research consists of the following aspects: Firstly, the requirements of t he s ystem f or i mage pretreatment a nd t he works f or pretreatment part are introduced. A series of image processing methods, like Non-uniformity c orrection, median f ilter pr ocessing a nd ps eudo-color enhancement are present to deal with infrared image with too low in contract and p oor visual e ffects. T hese m ethods give a c learer i mage a nd i mprove visual ability to d istinguish im age d etails. S econdly, M ethod of external blackbody i s p roposed t hrough theoretical i nference and ex perimental demonstrations. Via Standard calibration method using double blackbody, the setting and environmental i mpact o n t emperature-measuring a nd e rror i s reduced, improving its accuracy. Thirdly, based on the research above, a set of imaging a nd te mperature-measuring s oftware s ystem w ith o bject-oriented method is developed to meet requirements of actual imaging and temperature- measuring. T his s ystem p rocesses th e f ollowing f unctions: real-time vi deo, single f rame i mage s toring, m easuring t emperature of point, highest a nd lowest t emperature o f global an d p artial area i n i mage, N on-uniformity correction, median filter processing, pseudo-color enhancement, temperature correction, alarm set and so on.