A Modulation Depth Calibration in Orthogonal Demodulation for Optical Fiber Interferometric Sensor
In orthogonal demodulation,it is important to keep the modulation depth on z. The real modulation depth always has deviation which affects the sampling off the peak point. A calibration method is proposed. By choosing suitable sampling points and using the orthogonal property of two components,an approximate offset can be calculated by selecting different formula from different case,which is,when the sine of the phase related to measured parameters is small,the even component sampling points are combined to calculate the offset,otherwise,the odd component sampling points are combined. The formula for the calibration is linear relation with the sampling values,and just reuse the existed values. With an iterative calibration process,the modulation depth can be controlled near to n within a certain error degree. After this process,all the sampling points keep near to the peaks and sampling values are insensitive to small shift of the sampling time.
optical fiber interferometric sensor modulation depth.
Ge Yunsheng
Department of Electricity and Computer Science,Guilin University of Technology Guilin,541004 Guangxi,China
国际会议
2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)
北京
英文
1931-1935
2009-08-16（万方平台首次上网日期，不代表论文的发表时间）