Design And Research Of Life Detection Based On Infrared Imaging

Natural disaster occurs frequently in recent years, such as earthquake, mud-rockflow, landslide etc. It always threatens life and property of people continuously. With thedevelopment of sensor technology, new technologies and new methods are used in thefield of life survey constantly. The detector based on the infrared thermal imagingtechnique is used widely in many life searching instruments. Infrared life detectiondistingguishes the different goals by perceiving the difference of temperature, discri-minates the victims and the environment. The optical system sends the human thermalradiation energy received to the infrared dector, the detector converts the temperaturesignal into physical signals measurably and infrared thermal image is displayed on themonitor by the signal processing system, in order to help the rescuers ascertain theposition of victims and determine whether the life existing. Infrared thermal imagingtechnique is a kind of non-contact detection and recognition technique by whichlong-distance thermal target can be tracked with the technology precisely. Moreover, it isnot disturbed by the influence of electromagnetic and glare, smoke, fog. It’s a importanttask in the field of military, industrial process detection and life rescue.In this paper, research on the system principle composition and structure of lifedetector deeply is made based on the number of reading ralated literature. Life detectorof uncooled focal plane infrared thermal imaging system for life rescue is designed. Themain contents are:The characteristics of the body infrared radiation and infrared optical system isanalyzed. The dual field of view of the detection system is proposed, and zoom system isachieved. The optical system image quality and simulation design is evaluated with theOSLO LT6.1 optical design software.The method and model of the uncooled focal plane array detectors is described andthe structure and circuit of uncooled focal plane readout system is designed. Themicrobolometer is chose as the detector and the surmount methods of detector’s noise areproposed. The basic performance parameters of the microbolometer and ascertain the detector’s detection range are defined.By choosing the drive circuit, the temperature control circuit and the A/D dataconversion circuit of the signal processing system, the overall system hardware isdesigned. The image signal processing system based on FPGA&DSP is designed.The work technological-process of life-detection systems is summarized, the generalparameters of the system are listed and the total property of system is evaluated.