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Development of Highly Sensitive Infrared Laser Image Sensing Technique and its Application

高灵敏红外激光图像传感技术的发展及其应用

基本信息

批准号：
16360201
负责人：
KOBAYASHI Takao
金额：
$ 9.47万
依托单位：
University of Fukui
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

The purpose of the research is to design and develop a highly sensitive infrared remote imaging system for detecting concentration and distribution profile of air pollution and hazard leak gases using the infrared tunable parametric oscillator. We have achieved several major results for realizing high sensitive imaging performance of the system.(1)The optical parametric oscillator has been developed using the ring cavity resonator and infrared output was generated at 3.39μm infrared wavelength for matching to the absorption lines of methane gas. Tunable single frequency output was obtained by injection seeding the 1.55 μm signal wave with the tunable laser diode and the infrared idler spectrum width was narrowed to 1/300 of the free running oscillation width. High resolution absorption spectrum has been obtained for the methane molecule and realized minimum detectable density and column length product of 20 ppm・m.(2)The frequency upconverter has been designed using the periodically pol … More ed PPMgLN crystal with the intense pump beam and the infrared signal is converted to near infrared wavelength at 810nm and detected by a sensitive photomultiplier. The conversion efficiency of the upconverter was 40% for the backscatter signal and the detection sensitivity was 11 times higher than the cooled InAs detector.(3)By raster scanning the infrared beam with two scanner mirrors, imaging was realized for the methane gas plume with accuracy of 20 ppm・m at range of 〜2m. The infrared beam wavelength was alternately modulated to on and off absorption line of the methane gas and the differential absorption technique was used to obtain pure methane gas image.From these results, we could realize highly sensitive imaging system of distribution profile of methane leak gas. By further reducing the size and improving the pulse repetition frequency of the pump laser, the system can be used for practical application of remote detection of several pollution gases and hazard leak gases in the atmosphere. Less

本课题的研究目的是利用红外可调谐参量振荡器设计和研制一种高灵敏度的红外遥感系统，用于探测大气污染和危险泄漏气体的浓度和分布轮廓。我们已经取得了几个主要成果，实现高灵敏度的成像性能的系统。（1）利用环形腔谐振器研制了光学参量振荡器，并在3.39μm红外波段产生了与甲烷气体吸收谱线匹配的红外输出。用可调谐半导体激光器注入1.55 μm信号波，获得了可调谐单频输出，红外闲频谱宽度被压缩到自由振荡宽度的1/300。获得了甲烷分子的高分辨吸收光谱，实现了最小可探测密度和柱长积为20 ppm·m。（2）采用周期性极化设计了上变频器 ...更多信息艾德对PPMgLN晶体进行强泵浦，将红外信号转换为810 nm的近红外波长，用灵敏的光电倍增管检测。上转换器的转换效率为40%的反向散射信号和检测灵敏度是11倍以上的冷却InAs探测器。(3)By采用两个扫描镜对红外光束进行光栅扫描，实现了对甲烷羽流的成像，成像精度为20 ppm·m，距离为0.2m。将红外光束波长交替调制到甲烷气体的通、断吸收线上，利用差分吸收技术获得纯甲烷气体图像，实现了甲烷泄漏气体分布轮廓的高灵敏度成像系统。通过进一步减小泵浦激光器的尺寸和提高泵浦激光器的脉冲重复频率，该系统可用于大气中多种污染气体和危险泄漏气体的远程检测的实际应用。少