微型高分辨大量程的时差测量方案

doi:10.19665/j.issn1001-2400.2020.04.004

摘要/Abstract

摘要：

针对高精度时间间隔测量仪的高分辨和大量程矛盾、精度受温度的影响较大、可靠性不高以及体积和功耗较大等问题,利用参考信号生成校准信号来对受温度影响较大的模拟电路进行自动校准,大大降低了温度对仪器精度的影响;采用了双计数器同步测量技术并利用逻辑算法来分析和修正得到的测量结果,解决了由于计数器部分的误触发而导致测量结果存在粗大误差的问题;采用了电子计数法和时间电压转换法相结合的设计方案来兼顾仪器的测量范围和测量分辨率。实现的样机的电路板面积只有10cm²,其有效分辨率优于10ps,均方差小于15ps,量程大于20000s,且测量结果具有很高的可靠性。

关键词: 时间间隔测量, 时间电压转换, 可编程逻辑器件, 分辨率, 量程

Abstract:

This paper presents some solutions to the problems in the precise time interval measuring instrument such as the contradiction between high resolution and wide measurement range, the high temperature sensitivity, the low reliability and the big volume and power consumption. The reference signal is used to generate calibration signals to automatically calibrate the analog circuits which are greatly affected by the temperature. The calibration data are used to amend the conversion coefficient between voltage and time interval and the temperature sensitivity of the instrument is greatly reduced. To avoid the gross error in the measurement result caused by the false trigger of the counter, the double counter synchronous measurement technique is adopted and the logic algorithm is used for analyzing and correcting the measured results. Electronic counting method and time-to-voltage converter method are combined together to meet the requirements of the measurement range and resolution of the instrument. The circuit board’s area of the prototype is only 10cm². The prototype’s effective resolution is above 10ps and the standard deviation of multiple measurement results is below 15ps, the measurement range is wider than 20, 000 seconds, and its measurement results are highly reliable.

Key words: time interval measurement, time-to-voltage, field programmable gate array, high precision, measurement range

中图分类号:

TM935.12

屈八一,刘烨豪,张桃靖,刘威,俞东松,周渭. 微型高分辨大量程的时差测量方案[J]. 西安电子科技大学学报, 2020, 47(4): 24-30.

QU Bayi,LIU Yehao,ZHANG Taojing,LIU Wei,YU Dongsong,ZHOU Wei. Scheme for miniature time difference measurement with a high resolution and a large range[J]. Journal of Xidian University, 2020, 47(4): 24-30.

图/表 6

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