Acoustic leak detector. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Acoustic leak detector. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Consumer electronics

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An acoustic leak detector will help determine the location of damage in pipes of heating networks, water pipes, gas pipelines, etc.

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The main parameters:

Maximum damage detection depth, m.......3
Detection accuracy, m.......1
Operating frequency range, Hz.......100...5000
Operating temperature range, °С.......-20...+30
Relative humidity, %.......98
Supply voltage, V ......., 5 and 3
Operating time with one set of power supply (five elements 332), h.......100

Acoustic vibrations that occur at the site of damage are perceived by the piezoelectric transducer B1, which is included in the gate circuit of the field-effect transistor V1 of the preamplifier, which has three stages on transistors V1-V3 with a direct connection between them. From the collector of transistor V3, the signal goes to the gain controller R10, and then to the output amplifier, assembled on transistors V4 and V5, also with a direct connection between the cascades. The output stage of the amplifier is loaded on high-impedance telephones B2 and a measuring device P1 with a diode rectifier V6 - V9.

The gain of the amplifier is 15...20 thousand. To reduce the level of intrinsic noise, the preliminary and output amplifiers are fed separately. The inherent noise voltage of the entire amplifier, reduced to the input, does not exceed 1 ... 2 μV.

The leak detector uses an M261M device with a total deflection current of 50 μA, Ton-2 head phones and a PE-ET piezoelectric element.

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