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Compensation for temperature variation in ultrasonic chemical process monitoring

Chemical processes often involve heat exchange that causes changes in the temperature of the reactor. These temperature changes could affect ultrasonic monitoring of the processes to the same extent as changes in chemical composition. Discrimination between these two factors requires separate monitoring of the temperature. An ultrasonic reflector for pulse-echo monitoring of aqueous solutions with integrated temperature sensing was developed, implemented and experimentally tested. It contains a water filled cavity isolated from the test medium that is used as a reference. A compact 3 mm wide cavity provides changes in propagation delay of about 1 sample per 0.05 o C at a sampling frequency of 2430 MHz. The possibility of achieving even finer resolution is demonstrated.