Humidity measurement

Humidity measurement using the piezoelectric sensor

Principle of measuring humidity: The oscillation frequency of a quartz crystal coated with hygroscopic material is a very sensitive detector of the weight of absorbed water because very small changes in frequency can be measured. Working of Piezoelectric meter: Two quartz crystal oscillators are used, alternating between moist and dry gas, generally for 30 seconds …

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Hair hygrometer, principle operation and application

Hygrometers are humidity sensors, The hair hydrometer is a type of absorption hydrometer and uses the technique of mechanical moisture detection. Principle of Hair hygrometer Due to humidity, several materials undergo a change in physical, chemical and electrical properties. This property is used in a transducer designed and calibrated to directly read the relative humidity. …

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Humidity Measuring Devices – Psychrometers & Hygrometers

Humidity can be measured using materials that absorb water vapor, giving a change in their characteristics that can be measured; by measuring the latent heat of evaporation; by dew point measurement; or by microwave absorption. There are two types of meters, Psychrometers & Hygrometers. Psychrometers: A psychrometer uses the latent heat of vaporization to determine relative …

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