Signal compensation circuit of pipeline corrosion degree measuring instrument

Abstract

The invention discloses a signal compensation circuit of a pipeline corrosion degree measuring instrument. The signal compensation circuit comprises a frequency collecting circuit, a push-pull buffercircuit and a compensation output circuit; the frequency collecting circuit collects analog signal frequencies when the pipeline corrosion degree measuring instrument works; the push-pull buffer circuit applies a push-pull circuit composed of a triode Q3, a triode Q4, a triode Q5, a diode D4 and a diode D3 to process the signals, meanwhile applies a buffer circuit composed of a resistor R8, a capacitor C4 and a triode Q6 to buffer the signals, and applies a triode Q7 to feed operational amplifier AR1 output signals back to an emitting electrode of the triode Q5, finally, an operational amplifier AR2 amplifies the signals in a noninverting mode and then inputs the signals into the compensation output circuit, finally, the compensation output circuit applies a power supply +10 V and is subjected to pressure dividing through a variable resistor RW2 to compensate operational amplifier AR2 output signals, and applies a resistor R16, a resistor R17, a capacitor C5 and a capacitor C6 to constitute a RC circuit to filter the signals and then output the signals, and the analog signal frequencies can be converted to compensating signals of analog signals of the pipeline corrosion degree measuring instrument.

Description

technical field [0001] The invention relates to the technical field of signal calibration, in particular to a signal compensation circuit of a pipeline corrosion degree measuring instrument. Background technique [0002] Pipeline corrosion detection refers to the in-pipeline inspection for the purpose of detecting metal loss such as pipe wall corrosion. The signal compensation circuit of the corrosion degree measuring instrument is to calibrate the collected signal and improve the measurement accuracy of the pipeline corrosion degree measuring instrument. However, in practice, the working environment of the pipeline corrosion measuring instrument is uncontrollable. The analog signal received by the instrument control terminal will hop frequency, and even the signal will be distorted due to insufficient signal power during transmission, which seriously affects the measurement accuracy of the pipeline corrosion degree measuring instrument. [0003] So the present invention pr...

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Problems solved by technology

[0002] Pipeline corrosion detection refers to the in-pipeline inspection for the purpose of detecting metal loss such as pipe wall corrosion. The signal compensation circuit of the corrosion degree measuring instrument is to calibrate the collected signal and improve the measurement accuracy of the pipeline corrosion degree measuring instrument. However, in practice,

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