Special ultrasonic liquid level measuring device and method for inspection well

Abstract

The invention discloses a special ultrasonic liquid level measuring device and method for an inspection well. The special ultrasonic liquid level measuring device specifically comprises a control module, an ultrasonic probe, an amplitude limiting circuit, a passive filter circuit, a multi-stage band-pass filter circuit and a power detection circuit. The control module is used for generating a frequency signal corresponding to a frequency of an ultrasonic probe according to a control instruction; calculating is performed according to an effective detection signal to obtain a measurement result;the ultrasonic probe is used for transmitting an ultrasonic detection signal with the corresponding frequency to a detected area according to the amplified frequency signal and receiving a feedback ultrasonic feedback signal; the amplitude limiting circuit is used for carrying out amplitude limiting processing on the ultrasonic feedback signal; the passive filter circuit is used for filtering a source end noise in the ultrasonic feedback signal; the multi-stage band-pass filter circuit is used for carrying out amplification and noise filtering processing with a preset frequency on the ultrasonic feedback signal subjected to source end noise filtering; and the power detection circuit is used for analyzing the ultrasonic feedback signal amplified and filtered by the multi-stage band-pass filter circuit to obtain an effective detection signal.

Description

technical field [0001] The invention relates to the field of measurement, in particular to a special ultrasonic liquid level measuring device and method for a manhole. Background technique [0002] At present, ultrasonic level gauges are generally used for liquid level measurement in inspection wells, and ultrasonic level meters are generally used in solid, stable surfaces, and stable environments. There are many problems in the application of liquid level measurement in inspection wells. Specifically, the control center generally uses microcontrollers such as single-chip microcomputers or DSPs as the core, and circuits such as related drivers and filters are added to the periphery. Power management generally uses LDO or DCDC. The pulse amplification circuit often adopts a transformer with a higher transformation ratio or transforms it into a high-voltage source (generally nearly 1K volts) through a flyback converter to achieve pulse amplification through a high-voltage MOS...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a special ultrasonic liquid level measuring device and method for inspection wells, which can solve the EMI problem, reduce hardware costs, and overcome problems such as inability to measure and measurement value errors caused by civil structures in the inspection well.

Images