论文部分内容阅读
为了消除光源强度波动对测量结果的影响 ,根据溶液浓度与其折射率的关系和光纤法布里 -珀罗 (F- P)干涉仪透射光谱中心波长与干涉仪腔内介质折射率之间的关系 ,利用其透射光谱的中心波长进行透明溶液浓度的精确测量 ,开发出测量实验系统。采用可调光学滤波器对传感信号进行采集。对浓度为 5 %～ 80 %的酒精进行了实际测量实验 ,浓度最大测量偏差为 0 .0 0 3%。该系统具有如下特点 :1)与 CCD测量技术相比 ,采用法布里 -珀罗干涉系统透射光谱的波长信号进行溶液浓度测量 ,可实现连续大范围、高精度测量 ;2 )消除了光源波动对测量结果的影响 ,可实现连续高精度测量 ,且测量范围宽 ;3)直接利用光电探测器 PIN进行传感信号的检测 ,使系统计算简单 ;4 )便于实现分布式遥测系统 ;5 )直接拟合出 F- P干涉波长与溶液浓度之间的关系 ,使其更适合于工程实际的应用。
In order to eliminate the influence of the intensity fluctuation of the light source on the measurement results, according to the relationship between the solution concentration and its refractive index and the relationship between the center wavelength of the transmission spectrum of the Fabry-Perot (F-P) interferometer and the refractive index of the cavity in the interferometer , Using the center wavelength of its transmission spectrum for precise measurement of the concentration of the transparent solution, a measurement experiment system was developed. Sensing signal acquisition using adjustable optical filters. The actual measurement experiment was conducted on the alcohol concentration of 5% ~ 80%, the maximum measurement deviation was 0.003%. The system has the following features: 1) Compared with the CCD measurement technology, using the Fabry-Perot interference spectrometer wavelength signal of the transmission spectrum for solution concentration measurement, to achieve continuous large-scale, high-precision measurement; 2) Elimination of light source fluctuations 3) Directly detect the sensor signal with the photo detector pin PIN, make the system calculation simple; 4) Facilitate the realization of distributed telemetry system; 5) Directly The relationship between F-P interference wavelength and solution concentration is fitted to make it more suitable for engineering application.