Simultaneous measurement of atmospheric moisture and temperature in the presence of suspended particulates using ultrasonic technique

Simultaneous measurement of atmospheric moisture and temperature in the presence of airborne particulates over an extended region using a single sensor is very important for the prediction of fog in an open environment. Here, we have developed an ultrasonic technique to measure relative humidity and temperature of open-air containing suspended particulate matter in a controlled environment. We achieved an accuracy within 0.9 K for a temperature range of 297-302 K, and within 2.68% for relative humidity in the range of 60%-100%. We also characterized laboratory-generated fog using ultrasound and found our results to be in agreement with the conventional optical method. At higher concentrations, our technique appears to be a better means of characterizing atmospheric moisture content compared to light.