Dew point measurement based on the sensitive circuit
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摘要: 针对大气湿度测量问题,提出一种基于敏感电路的露点测量方法.把考比兹电路中的石英晶体作为湿敏元件,用半导体制冷器对其进行制冷直到有结露产生时使得石英晶体处于液相环境中,整个考比兹电路将停止振动,利用考比兹电路这一敏感特性对露点进行识别,可以得到相应的露点温度.通过理论数据与实验数据对比分析,露点温度的最大误差为1.59℃,此方法可以从定性的角度作为一种湿度快速识别方法,并具有测量方法简单、灵敏度高、可靠性好和成本低等优点.Abstract: According to the problem of atmospheric humidity measurements, the dew point measurement method was proposed based on the sensitive circuit. The quartz crystal as a humidity sensor, when water condensation produced by the Peltier cooling appears on the quartz crystal, the test circuit will stop the vibration. Use this characteristics of colpitts oscillator distinguish the dew point and can get the dew point temperature. The measurement results with the proposed method were compared with the actual data. Though some measurement error was yielded, it is proved that the proposed method is useful for measuring the dew point of moist air and it has some advantages such as simple, high sensitivity, good reliability and low cost.
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Key words:
- colpitts circuit /
- dew point /
- semiconductor cooler /
- quartz crystal microbalance
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