Precise measurement of voltages in space cryogenic radiation temperature system

SONG Bao-qi; YE Xin; YANG Dong-jun; JIANG Ming; FANG Wei

doi:10.3788/OPE.20152307.1903

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Precise measurement of voltages in space cryogenic radiation temperature system

更新时间：2020-08-12

- Precise measurement of voltages in space cryogenic radiation temperature system
- Optics and Precision Engineering Vol. 23, Issue 7, Pages: 1903-1910(2015)
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所,吉林长春,130033
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152307.1903
  CLC： TM933.2;TP732
- Received：12 March 2015，
  
  Revised：20 April 2015，
  
  Published：25 July 2015
- 稿件说明：
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宋宝奇, 叶新, 杨东军等. 空间低温辐射计中的精密电压测量系统[J]. 光学精密工程, 2015,23(7): 1903-1910

SONG Bao-qi, YE Xin, YANG Dong-jun etc. Precise measurement of voltages in space cryogenic radiation temperature system[J]. Editorial Office of Optics and Precision Engineering, 2015,23(7): 1903-1910
宋宝奇, 叶新, 杨东军等. 空间低温辐射计中的精密电压测量系统[J]. 光学精密工程, 2015,23(7): 1903-1910 DOI： 10.3788/OPE.20152307.1903.

SONG Bao-qi, YE Xin, YANG Dong-jun etc. Precise measurement of voltages in space cryogenic radiation temperature system[J]. Editorial Office of Optics and Precision Engineering, 2015,23(7): 1903-1910 DOI： 10.3788/OPE.20152307.1903.

摘要

为了基于测温电阻实现空间低温辐射计的腔温测量

研究了系统的电子学测量精度和测量稳定度。结合实际电子学需求

进行方案设计和器件选型

提出了一种新型的基于超低噪基准源LTZ1000ACH

四线制柱状锗电阻GR1400-AA和24位模数转换器LTC2400的对偶相消式精密电压测量系统。对于整个链路信噪比进行了逐级理论计算和分析

并通过电路仿真软件TINA-TI对系统幅频特性和温度响应特性进行了仿真分析

最后在77K液氮环境下对该系统进行了测温精度和长期稳定性测试。实验结果表明:锗电阻实际采样电压值在100

V内波动

长期测量稳定度达到1×10

-5

;在77 K液氮环境下

系统测温精度达到4 mK

长期稳定性达到1×10

-5

。得到的结果基本满足空间低温辐射计电子学部分的设计指标要求。

Abstract

To implement the temperature measurement of a cavity in the space cryogenic radiometer based on a temperature resistance

the measuring accuracy and measuring stability of the electronic system in the radiometer was researched. By taking the scheme design and device selection into account

a new precise voltage measuring system was proposed based on an ultralow noise accuracy voltage reference source(LTZ1000)

a four wire germanium resistance(GR1400-AA)and a 24 bit analog to digital converter(24 bit AD). Then

the noise ratio for the entire system was calculated in theory

and the temperature characteristics and the amplitude frequency response of the system were simulated by using TINA-TI. Finally

the experiment on measuring temperature accuracy and long-term stability for this system was performed at the 77 K constant temperature environment. The experimental results show that the actual sampling voltage of germanium resistance is within 100

and the long-term stability is lowered to 1×10

-5

. Moreover

the temperature measurement accuracy of system is less than 4 mK

meanwhile

the temperature stability is up to 1×10

-5

. So

the proposed precise temperature measurement system basically meets the needs of space cryogenic radiometer for long-term stability and measurement accuracy.

关键词

Keywords

references

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