A small light-weight in-house made miniature chilled-mirror hygrometer (CMH) for fixed wing UAS (unmanned aircraft system) is presented, with its features and limitations. Therefore, first measurements of the CMH equipped on the small research UAS of type MASC‑3 (multi-purpose airborne sensor carrier) operated by the University of Tübingen are shown. A comparison against a very accurate state of the art capacitive industrial humidity sensor (SHT31) is done. The sensor consists of a TEC (thermoelectric cooler) covered by a gold mirror. The TEC is controlled by a commercially available microprocessor with an on-board PID (proportional-integral-derivative) controller. The results of the CMH measurements are in good agreement with the industrial-made capacitive sensor. The absolute accuracy of the measured dew point temperature by the CMH is in the range of ±0.2 K. Spectra show evidence that the CMH is capable to measure turbulent humidity fluctuations in the atmosphere with a temporal resolution of up to 10 Hz. Such a fast humidity sensor aboard a small UAS has the potential to study humidity fluxes in the surface layer over complex terrain, behind wind energy converters and humidity variations over land and sea surfaces in general.

中文翻译：

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固定翼UAS上用于大气测量的微型高频冷镜湿度计

提出了一种用于固定翼UAS（无人飞机系统）的小型轻量级内部制造的微型冷镜湿度计（CMH），并具有其功能和局限性。因此，显示了在蒂宾根大学操作的小型研究型UAS MASC-3（多功能机载传感器载体）上配备的CMH的首次测量结果。与非常精确的现有电容式工业湿度传感器（SHT31）进行了比较。传感器由被金镜覆盖的TEC（热电冷却器）组成。TEC由带有板载PID（比例积分微分）控制器的市售微处理器控制。CMH测量的结果与工业制造的电容传感器非常吻合。CMH测得的露点温度的绝对精度在±0.2 K范围内。光谱表明，CMH能够以最高10 Hz的时间分辨率测量大气中的湍流湿度波动。这种小型UAS上的快速湿度传感器有潜力研究复杂地形，风能转换器后面的表层湿度通量以及陆地和海表总体的湿度变化。