산화 알루미늄 및 냉각거울 노점계의 온도 의존성에 관한 연구
The Effect of Temperature on Aluminum Oxide and Chilled Mirror Dew-point Hygrometers
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The measurement of absolute humidity of gases is essential in many industries. The effect of temperature on aluminum oxide and chilled mirror dew-point hygrometers is investigated. The temperature of laboratory, pipe line, and sensor is varied and the dew pointis measured by two different aluminum oxide hygrometers. In all cases, the dew point of hygrometers is increased as the temperatureis elevated. The reason behind this observation is due to desorption of water from the inside of pipe line and/or sensor surroundings at elevated temperature that result in the increase of the absolute humidity. Moreover, the sensor itself shows a certain degree of temperature dependency in sensing the humidity especially at low temperature. It is also studied that chilled mirror dewpoint hygrometer may indicate a higher dew point than the reference at high temperature because the cooling capability of mirror is decreased at high temperature. Our study will provide evidences in the incorporation of the temperature effect as uncertainty factors in the standard calibration procedure for dew point hygrometers.
Abstract
The measurement of absolute humidity of gases is essential in many industries. The effect of temperature on aluminum oxide and chilled mirror dew-point hygrometers is investigated. The temperature of laboratory, pipe line, and sensor is varied and the dew pointis measured by two different aluminum oxide hygrometers. In all cases, the dew point of hygrometers is increased as the temperatureis elevated. The reason behind this observation is due to desorption of water from the inside of pipe line and/or sensor surroundings at elevated temperature that result in the increase of the absolute humidity. Moreover, the sensor itself shows a certain degree of temperature dependency in sensing the humidity especially at low temperature. It is also studied that chilled mirror dewpoint hygrometer may indicate a higher dew point than the reference at high temperature because the cooling capability of mirror is decreased at high temperature. Our study will provide evidences in the incorporation of the temperature effect as uncertainty factors in the standard calibration procedure for dew point hygrometers.
참고문헌 (4)
- Z. Chen, "Humidity sensors : A review of materials and mechanisms", Sensor Letters, 3, pp.274~295 (2005)
- KASTO Standard Calibration Procedure, "Standard calibration procedure of dew-point hygrometers, KASTO 08-50201-370", ~ (2008)
- KASTO Standard Calibration Procedure, "Standard calibration procedure of alumina thin film dew-point hygrometers”, KASTO 08-50203-372", ~ (2008)
- B. I. Choi, "Extension of humidity standards to −105 oC frost point", Int. J. Thermophys, 36, pp.2231~2241 (2015)