Solid rocket motor propellant gain thickness measurement method based on ultrasonic nonlinearity
In order to expand the thickness measurement range of the propellant gain of high-attenuation solid rocket motor,the theory of static component(SC)generated by ultrasonic longitudinal wave in solid propagation is used in this paper.Through the combination of reflective ultrasonic transducers with one transmitter and two receivers,the working frequency of the ultrasonic transducer at the transmitter is 500 kHz,and the working frequency of the ultrasonic transducer at the receiving end is 50 and 500 kHz respectively,to complete the static measurement of a variety of thickness of propellant gain.The measurement results show that the 50 kHz ultrasonic transducer can amplify and receive the low-frequency SC signal excited by the 500 kHz ultrasonic longitudinal wave for the larger thickness of the propellant gain,and the 500 kHz can receive the 500 kHz fundamental signal and the low-frequency SC signal at the same time for the smaller thickness of the propellant gain.Compared with the traditional transducer combination of the same frequency transceiver,the transducer combination of one transmitter and two receivers improves the measurable thickness range without increasing the blind area of thickness measurement.And it can complete the measurement in the thickness range of 20～200 mm,which has a certain degree of innovation and good practical value.
solid rocket motor propellant gainultrasonic transducerstatic component SCone transmitter and two re-ceivers
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