自外差 meaning in Chinese

self heterodyne

More , this paper discusses some important performance parameters of the coherent self - heterodyne botdr system , such as dynamic ranges , spatial resolution , minimum detectable change
在此系统基础上,本文讨论分析了相干自外差探测系统以及该botdr系统的动态范围、空间分辨率、最小可探测温度/应变变化量等重要性能参数。
Based on this , we bring forward a availability and viable distributed fiber sensing for temperature and strain system that based on spontaneous brillouin scattering , coherent self - heterodyne botdr , and done part experimental study
在此基础上,提出了一种有效可行的基于布里渊散射的分布式光纤温度/应变传感系统? ?相干自外差的布里渊散射分布式光纤传感系统,并完成了部分实验研究。
At the same time , it uses a frequency translator to obtain a frequency shift , which is equal to the brillouin frequency in fiber . then the detecting pulsed light and the cw reference light can coherent . this method greatly improved the system ’ s sensitive and signal to noise ratio ( snr )
同时在探测光路中引入一个光移频环路,使探测光移频后再经光纤中布里渊频移,其后向布里渊散射光频率与参考光束大致相当,可进行相干自外差探测,大大提高了系统的探测灵敏度以及系统的信噪比。