| 新型高精度多通道测温系统的研究 |
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| 引用本文： | 高峰,张辉.新型高精度多通道测温系统的研究[J].工具技术,2010,44(9):76-79. |
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| 作者姓名： | 高峰 张辉 |
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| 作者单位： | 合肥工业大学 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 提出一种基于NTC热敏电阻的新型高精度多通道测温方案。采用比较测量法,消除了恒流源的不确定性对测量精度的影响;采用高性能模拟开关进行切换,实现了多通道测温。设计了测量电路,通过采用电流倒向技术和恒流源与ADC共用基准源,提高了测温精度。测试结果表明,该测温系统在18℃-22℃范围内,温度测量精度可达±0.01℃,测量分辨率为0.001℃。
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| 关 键 词： | 多通道测温 比较测量 测量精度 恒流源 ADC 电流倒向 |
Study on New High-precision Multi-channel Temperature Measurement System |
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| Gao Feng,Zhang Hui.Study on New High-precision Multi-channel Temperature Measurement System[J].Tool Engineering(The Magazine for Cutting & Measuring Engineering),2010,44(9):76-79. |
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| Authors: | Gao Feng Zhang Hui |
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| Affiliation: | Gao Feng,Postgraduate,School of Instrument Science ＆ Opto-electronic Engineering,Hefei University of Technology,Hefei 230009,China Zhang Hui |
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| Abstract: | A new type of high-precision multi-channel temperature measurement program based on NTC thermistors was proposed.The uncertainty of constant-current source which affects the measurement accuracy is eliminated by using comparison measurement;the multi-channel temperature measurement is achieved by using high-performance analog multiplexers.A concrete measurement circuit was designed.The measurement accuracy is improved by using current backward technology and making the constant-current source share the same reference voltage source with the ADC.The test results show that the precision can be ±0.01℃ and the measuring resolution is 0.001℃ in the range from 18℃ to 22℃. |
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| Keywords: | ADC |
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