Method to measure humidity of high temperature air

Based on the energy and mass balance principles， presents a new method to measure the humidity of high temperature air by mixing cold and hot air in which the dry and wet bulb temperature of the cold air and mixed air and the dry bulb temperature of high temperature air are measured by temperature sensors， then the humidity and other parameters of high temperature air can be found by the thermodynamic relationship. And the humidity can also be measured conventionally. The method has the advantages of easy measurement， high precision， low cost and easy realization. Calculates and analyses the integrated error based on the error transfer theory. The result shows that the precision of relative humidity for the high temperature(up to 140 ℃) and low humidity(up to 15%) air is within ±05% by the proposed method.