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中国科学院 长春光学精密机械与物理研究所,吉林 长春,130033
[ "宋宝奇(1985-),男,辽宁抚顺人,硕士,助理研究员,分别于2008年、2011年在北京大学获得学士、硕士,主要从事太阳辐射计量和嵌入式软件开发等方面的研究。E-mail:songbaoqipku04@126.com" ]
[ "方伟(1965-),女,辽宁锦州人,博士,研究员,1997年于中科院长春光机所获得硕士学位,2005年于中科院长春光机所获得博士学位,现为FY-3卫星太阳辐射监测仪主任设计师,主要从事太阳辐射计量研究。E-mail:Fangw@ciomp.ac.cn" ]
[ "叶新(1979-),男,吉林省吉林人,硕士,副研究员,分别于2002年和2005年于中国科技大学获得学士、硕士学位,主要从事太阳辐射计量及电子学系统设计等方面的研究。E-mail:newsyears@ustce.edu" ]
[ "杨东军(1979-),男,山东莱芜人,博士,助理研究员,2005年于大连理工大学获得硕士学位,2012年于中科院长春光机所获得博士学位,主要从事太阳辐射计量及微弱信号监测方面的研究。E-mail:djyang0827@163.com" ]
[ "姜明(1986-),男,黑龙江省哈尔滨市人,硕士,助理研究员,分别与2008年、2011年在北京航空航天大学获得学士、硕士学位,主要从事太阳辐射计量和机械结构设计等方面的研究。E-mail:jiangming8631@126.com" ]
收稿日期:2015-03-12,
修回日期:2015-04-20,
纸质出版日期:2015-07-25
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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.
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
μ
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。
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
μ
V
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.
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