摘要
根据光外差检测原理,分析得到干涉测量适用于信号光强小于参考光强的探测,直接测量适用于信号光强大于参考光强的探测的结论。利用自制的全光纤马赫-曾德尔干涉仪系统,对位移信号进行了测量。实验结果表明:当位移信号较小时,干涉测量的灵敏度分别为62.068μW/mm和9.90mV/mm,而非干涉测量的灵敏度分别为4.30μW/mm和0.35mV/mm;当位移信号较大时,干涉测量的灵敏度分别为2.643mV/mm和0.055mV/mm,非干涉测量的灵敏度分别为12.326mV/mm和4.194mV/mm,测量结果与分析得到的结论一致。对于光纤干涉仪强度调制检测的应用具有参考价值。
According to the principle of optical heterodyne measurement, the interferometry is suitable for the signal whose intensity is weaker than reference signal, while the non-interference survey (direct measurement) is suitable for the signal whose intensity is stronger than reference signal. By using our self-made all optical fiber Mach-Zehnder interferometer, the displacement signal is measured. The experiment results show that the sensitivity of interference measurement is respectively 62. 068 μW/mm and 9.90 mV/mm, and the sensitivity of non-interference measurement is 4. 30 μW/mm and 0. 35 mV/mm when the amount of displacement is lower. When the displacement is larger, the sensitivity of interference measurement is respectively 2. 643 mV/mm and 0. 055 mV/mm and the sensitivity of non-interference measurement is 12. 326 mV/mm and 4. 194 mV/mm. The experiment results are in keeping with the conclusion of our analysis. This work makes reference for the application of the intensity modulation measurement of all optical fiber interferometer.
出处
《光学与光电技术》
2008年第5期42-44,共3页
Optics & Optoelectronic Technology
关键词
光纤马赫-曾德尔干涉仪
干涉探测
强度调制
测量灵敏度
all optical fiber Mach-Zehnder interferometer
interference survey
intensity modulation
measurement sensitivity