I. Introduction
Temperature and humidity are two important parameters that require accurate monitoring and precise control in scenarios such as micro-electro-mechanical systems [1], wind tunnel tests [2], indoor air quality [3] and products storage [4]. For the manufacturing of microchips, an excessive humidity would undermine the cleanliness of the photomask and wafer surface. Long time exposure to a high humidity environment would cause haze on the surface, which in turn would reduce the yield. In a wind tunnel, the range of temperature and humidity should be well controlled to ensure accurate calculation of Reynolds and Mach numbers which are essential experimental parameters. For indoor air quality, temperature and humidity are strongly related to viral and bacterial infections. For products storages, precise optoelectronic instruments are sensitive to the variation of temperature and humidity, and drugs are easily contaminated by water vapor. Therefore, accurate knowledge of temperature and humidity is significant for industrial production, environmental monitoring and fundamental research.