摘要
高速光子探头轴温探测器采用HgCdTe(碲镉汞)晶体材料的低阻光导型器件作为探测器的敏感元件,选用锗(Ge)材料制作透镜,并在光学透镜表面镀增透膜,使透过率达到80%以上;光学系统焦距为25mm,相对孔径为F/1.5。为提高探测器的灵敏度和探测率,采用3级热电致冷,元件冷面温度为-65℃±0.02℃。为提高放大器的抗干扰性能,放大器电路采用共模抑制能力很强的差模输入方式。由于探测器箱温的变化会影响对轴温的探测精度,所以在探测器中增加了由可控热源、热源温度传感器(铂电阻)、热靶、控制模板、加热电源模板等构成的温控自适应系统。该探测器经在提速铁路干线上安装运用,取得了满意的效果。
Low resistance photoconductive element made from HgCdTe crystal is the sensor of high-speed photoconductive hotbox detector. The lens is made of Ge, and on the surface of the lens, the film is used to increase the transmissivity over 80%. Focus of the optics system is 25 mm and the relative aperture is F/1.5. In order to increase the sensitivity and detectivity of the detector, a three stage thermoelectric cooling device is adopted, and the temperature on the cool surface can be lowered to -65℃±0. 02℃. For improving the anti-interference ability of the amplifier, the Differential Mode input with high common mode restraining technology is adopted in amplifier circuits. The detecting accuracy of the bearing temperature will be influenced by the changing of detector box temperature, so a temperature self-adapting system which consists of controllable heat source, Pt resistance, hot target, control circuit, heating power circuit, is installed. The detectors have been applied to speed-increase trunk lines in China, and the results are satisfying.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2007年第2期135-138,共4页
China Railway Science
基金
铁道部科技研究开发计划项目(2001J019)
