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本文叙述为光时域反射计(OTDR)的信号处理所研制的取样积分器。利用OTDR来测试光纤特性时,用取样积分器来处理测得的光纤衰减特性曲线,既可以改善信噪比,又可使系统与X-Y记录仪等适配。取样积分器利用取样原理,对含有随机噪声的周期信号多次重复取样,由于取样脉冲与信号之间的相关性,从而使信噪比改善。本组根据一些国外资料,结合OTDR的特点,研制了电路简单、成本不高、性能符合使用要求的取样积分器,既可以装在OTDR内部,也可以自成一简单的仪表,用于类似的周期性信号的处理。如加以改进还可更臻完善和多用化。目前达到的指标是:最小取样门宽20ns,触发信号重复频率1～5kHz(也可低于1kHz),分析时间1～500秒,双通道,可单点分析或扫描分析,信噪比改善度视所选参数而定。
This article describes a sampling integrator developed for the signal processing of optical time domain reflectometry (OTDR). When using OTDRs to test fiber characteristics, the sampled integrator can be used to process the measured fiber attenuation characteristics to improve the signal-to-noise ratio and adapt the system to the X-Y recorder. The sampling integrator uses the sampling principle to sample the periodic signal containing random noise several times and to improve the signal-to-noise ratio due to the correlation between the sampling pulse and the signal. This group based on some foreign information, combined with the characteristics of OTDR, developed a simple circuit, the cost is not high, the performance meets the requirements of the sampling integrator, either inside the OTDR can also be a simple instrument, for a similar Periodic signal processing. If you can improve more perfect and versatile. Currently reached the following indicators: the minimum sampling gate width of 20ns, the trigger signal repetition frequency 1 ~ 5kHz (also can be less than 1kHz), analysis time 1 ~ 500 seconds, dual channel, single point analysis or scan analysis, signal to noise ratio improvement Depending on the selected parameters.