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Non-contact, continuous measurement method for determining the temperature of gases

Dominik Exel M.Sc.

Dominik Exel M.Sc.

Non-contact, continuous measurement methods for determining the temperature of gases are used to automate industrial processes. There are many requirements for a universally applicable temperature measurement system. For example, the functional guarantee in a dusty, smoky and aggressive industrial air, accuracy, safety and last but not least a cost-effective realization.
The basic concept of RASS is to measure the speed of sound by Doppler radar. The measurement method is based on the effect that an acoustic wave modulates the density of the air. When an electromagnetic wave passes through the air, in which these acoustically induced changes in density occur, a small fraction of the signal will be reflected at each of the transitions.

Thus, the ultimate goal of the research project is to utilize a radio-acoustic sounding system (RASS) combined with a sound detecting and ranging system (SODAR) as it is used already for the measurement of velocity and temperature profiles of the lower to upper atmosphere.

Figure 1: left: basic concept RASS, right: Temperature - profile

Figure 1: left: basic concept RASS, right: Temperature - profile