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| The Research on Thickness Measurement of Oil-film Using Ultrasound and Experiment |
| SHEN Hong-miao，MA Xi-zhi |
| College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China |
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Abstract According to the related theory of the acoustic propagation in three layers of media,the resonant model and the spring model of oilfilm thickness measurement is given based on ultrasound reflection coefficient.On this basis,the experimental tests have been finished.The hardware circuit of signaling controller adopting STC is designed and made.The control program of waveform,frequency and number is written.The given oil film thickness of the specimen is measured by the developed circuit.The result shows that the thickness measurement of oil-film in mechanical structure can be obtained indirectly by measuring the ultrasonic reflection coefficient.The error of measurement is kept within the range of 5%.
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2014, Vol. 35 
