A non-destructive testing method for tunnel lining based on audio frequency analysis
A non-destructive testing and lining technology, which is applied in analyzing materials, analyzing solids using sonic/ultrasonic/infrasonic waves, and using sonic/ultrasonic/infrasonic waves for material analysis. Accurate, test the effect of science
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[0027] A tunnel lining non-destructive testing technology based on audio frequency analysis, comprising the following steps:
[0028] A smart phone with audio signal processing software is used to sample the percussion audio frequency generated by the exciter hammer striking the tunnel lining at a given sampling frequency to obtain the tunnel lining percussion audio signal; the percussion audio signal includes the exciter The ambient audio signal before the vibrating hammer is struck, and the audio signal after the vibrating hammer is struck. It should be noted that the mobile terminal with the recording function can be a mobile phone, a tablet computer, a tape recorder, a microphone with a storage function, etc., and this embodiment preferably adopts a mobile phone commonly used at present, and loads a simple APP (application software) to It is convenient to record the percussion audio signal, and can convert the percussion audio signal into a digital signal for interception ...
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