Ultrasonic systems are starting to find application in industrial process control systems. Such systems use conventional linear techniques to analyze and/or characterize a chemical reaction. Here, an active acoustic technique combining both linear and non-linear analysis is used for the characterization of a High Throughput Technology (HTT) product. The ultrasonic monitoring system was configured to detect ultrasonic backscatter from the samples. Both linear and non-linear approaches have been evaluated by changing the operating characteristics of the receiving transducer and implementing matched filtering data processing of the backscattered signals. Results acquired using this system demonstrate compatibility between the linear and non-linear techniques. This has been achieved by using a dual mode transducer, comprising two separate active elements operating at 2MHz and 4MHz.
Experimental configuration used for both the linear and non-linear experiments
Typical processed spectral characteristic showing both fundamental and second harmonic components
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