激光与光电子学进展, 2016, 53 (7): 070401, 网络出版: 2016-07-08
气体拉曼光谱检测系统中热电制冷CCD研究 下载: 823次
Study on Thermoelectrically Cooled CCD in Raman Spectrum Detection System for Gas Analysis
探测器 暗电流噪声 热模拟 真空 热电制冷 detectors CCD CCD dark current noise thermal simulation vacuum thermoelectric cooling
摘要
拉曼光谱检测中常用的CCD对温度较为敏感,降温可以有效降低其暗电流噪声。基于此,设计了一套制冷系统,采用有限元分析软件ANSYS分别模拟散热模块的导热情况及真空室内低、中真空度下气体流动热交换情况;实验测量了低、中真空度范围内不同真空度下温度随制冷时间变化的特性曲线,以及真空室内充入氩气、氖气、氮气作为保护气体时温度随制冷时间变化的特性曲线。结果表明氮气效果较好,并非真空度越高制冷效果越好,这与热模拟结果相符。测量了CCD在不同温度下的暗电流噪声,结果显示CCD温度对暗电流噪声影响较大,制冷可以有效减小暗电流噪声,且暗电流噪声变化与温度变化呈类指数关系。
Abstract
The commonly used CCD in Raman spectroscopy is sensitive to temperature, and cooling can effectively reduce its dark current noise. A cooling system is designed, and the finite element analysis software ANSYS is used to simulate the heat conduction of the heat sink and the heat exchange of gas flow in the vacuum chamber. The temperature change with the cooling time is measured at different vacuum degrees and with different buffer gas including Ar, Ne, N2 and air. The experimental results show that better cooling effect can be realized when N2 is used as buffer gas, and higher vacuum degree does not guarantee better cooling effect, which is consistent with the thermal simulation result. The measured dark current noise of CCD at different temperatures shows that CCD temperature has strong impact on its dark current noise, cooling can reduce the noise effectively, and the noise varies with temperature exponentially.
赵俊, 左都罗, 王新兵. 气体拉曼光谱检测系统中热电制冷CCD研究[J]. 激光与光电子学进展, 2016, 53(7): 070401. Zhao Jun, Zuo Duluo, Wang Xinbing. Study on Thermoelectrically Cooled CCD in Raman Spectrum Detection System for Gas Analysis[J]. Laser & Optoelectronics Progress, 2016, 53(7): 070401.