DEVICE FOR LEAKAGE DETECTION Russian patent published in 1998 - IPC

FIELD: non-destructive flaw detection using acoustic methods. SUBSTANCE: device has serial circuit of microphone 1, amplifier 2, band-pass filter unit 3, threshold gate 9 and indicator 10. Goal of invention is achieved by introduced serial circuit of minimal-amplitude clipper 4 with controlled clipping unit, pulse duration selector 7 and frequency- pulse detector 8 which are inserted between output of band-pass filter unit 3 and input of threshold gate. In addition device has amplitude detector 6 and low-pass filter 5. Input of amplitude 6 is connected to output of band-pass filter unit 3. Output of amplitude detector 6 is connected to input of low-pass filter 5, which output is connected to control input of amplitude clipper 4. EFFECT: increased functional capabilities. 1 dwg