作者：白雪, 李卢丹, 孙娟萍

作者单位：中国飞行试验研究院, 陕西 西安 710089

关键词：机载测试;热电偶;冷端补偿;校准

摘要：

某型直升机试飞测试改装工作因飞机结构特殊性而改进，导致采用常规热电偶校准方法无法实现校准过程的冷端补偿。针对这一问题，该文通过对热电偶测温原理及PT100冷端补偿方法进行研究，提出一种新的热电偶测温校准方法。为验证该方法在飞行试验数据测试工作中的准确性及实用性，在该型试验机新旧改装方法基础上分别采用传统方法与新方法对机载热电偶测试通道进行校准。结果对比表明：两种方法所得校准曲线基本一致，相同参数最大偏差与量程比值小于0.1%。新校准方法准确可靠，满足飞行试验测试数据误差要求，可为机载热电偶参数校准提供新思路。

Research on the cold end compensation and calibration method of airborne thermocouple

BAI Xue, LI Ludan, SUN Juanping

Chinese Flight Test Establishment, Xi'an 710089, China

Abstract: Due to structural particularities, a certain type of helicopter should have its flight test and refit improved. As a result, the conventional thermocouple calibration method fails to realize the cold end compensation in the calibration process. To solve the problem, a new thermocouple temperature measurement and calibration method is put forward according to the study of thermocouple temperature measurement principle and PT100 cold end compensation method. To verify the practicability and accuracy of the method in flight test data testing, in the aspect of old and new refit methods of the helicopter, both the conventional and new methods are used for the calibration of test channel of airborne thermocouple. The comparison results show that the two methods have basically the same calibration curve and the ratio of maximum deviation to the measuring range under same parameters is less than 0.1%. The results show that the new calibration method is accurate and reliable and can satisfy the precision requirement of flight test data, providing a new idea for parameter calibration of airborne thermocouple.

Keywords: airborne test;thermocouple;cold end compensation;calibration

2017, 43(9): 18-23  收稿日期: 2017-01-18;收到修改稿日期: 2017-03-05

基金项目: 

作者简介: 白雪(1989-),女,陕西延安市人,硕士,主要从事机载测试校准研究。

参考文献

[1] 樊尚春,吕俊芳,张庆荣. 航空测试系统[M]. 北京:北京航空航天大学出社,2005:157-160.
[2] 葛纪全,刘红,孟繁伟,等. 一种短型热电偶校准装置[J]. 计量与测试技术,2016,43(10):93-94.
[3] 付志勇,韩志鑫. 工作用贵金属热电偶校准能力验证[J]. 中国测试,2015,41(12):17-20.
[4] MORICE R, EDLER F, PEARCE J, et al. High-tem- perature fixed-point facilities for improved thermocouple calibration[J]. International Journal of Thermophysics,2008,29(1):231-240.
[5] 王化祥,张淑英. 传感器器原理及应用[M]. 天津:天津大学出版社,2004:140-146.
[6] 施建政,林松. 如何正确使用热电偶补偿导线[J]. 现代计量通讯,2007,34(1):23-25.
[7] 刘夫亮. 热电偶冷端补偿的实验与研究[D]. 北京:华北电力大学,2009.
[8] 刘希民.热电偶线性温度测量装置[J].仪器仪表学报,2007(增刊1):53-56,59.
[9] 张海涛,罗珊,郭涛. 热电偶冷端补偿改进研究[J]. 仪表技术与传感器,2011(7):11-14.
[10] 徐士良.数值分析与算法[M].2版.北京:机械工业出版社,2007:90-96.
[11] 李勃波. 热电偶常见测温误差分析[J]. 中国仪器仪表,2016(7):62-64.
[12] 张根甫,郝晓剑,桑涛,等. 热电偶温度传感器动态响应特性研究[J]. 中国测试,2015,41(10):68-72.
[13] 泰勒. 误差分析导论[M]. 王中宇,译. 2版. 北京:高等教育出版社,2015:171-186.