摘要
文中从空间光学遥感相机控温系统对宽温度场、高精度的温度测量需求出发,分析了基于NTC型热敏电阻测温电路的测温精度。当温差范围为120℃,在12bit量化的条件下,该电路无法全程满足测温精度要求。在此基础上,本文提出了一种基于NTC型热敏电阻和压控放大器的变增益测温电路,并对该电路的工作原理以及达到的测量效果进行了分析,在120℃温差范围内,该电路的测温精度均能满足±0.1℃,结果表明该方法能够有效的提高系统测温精度。
In this paper, the temperature measurement accuracy of the NTC （Negative temperature coefficient） thermistor circuit is analyzed which is based on the requirements of wide temperature-field and high precision space optics remote sensing camera. When the temperature difference range is 120 ℃, the circuit can not meet the requirements of the whole process in the quantization condition of 12 bit. On this basis, this paper presents a variable-gain temperature measurement circuit based on NTC thermistor and VCA （voltage controlled amplifier）. The principle of the circuit and the improvement of the measurement results are analyzed, in 120 ℃ difference range, the measurement precision of the circuit can meet ±0.1℃. The results show that the method can effectively improve the accuracy of temperature measurement.
出处
《电子设计工程》
2017年第8期46-49,共4页
Electronic Design Engineering
基金
国家自然科学基金面上项目(61573197)
关键词
空间遥感
测温精度
宽温度场
变增益控制
space remote-sensing
temperature measurement
wide temperature-field
variable gain control
