An Echo Signal Processing Circuit of Ultrasonic Level Meter

Abstract

The invention discloses an echo signal processing circuit of an ultrasonic level meter. The echo signal processing circuit includes a clamping amplitude limiting and oscillation damping circuit, an ultrasonic echo pre-amplification circuit, a time gain compensation circuit, a logarithmic amplification circuit and a signal filtering and shaping circuit; an input end of the clamping amplitude limiting and oscillation damping circuit receives a differential signal received by an ultrasonic transducer, and an output end of the clamping amplitude limiting and oscillation damping circuit is connected to an input end of the ultrasonic echo pre-amplification circuit; an output end of the ultrasonic echo pre-amplification circuit is connected to an input end of the time gain compensation circuit; an output end of the time gain compensation circuit is connected to an input end of the logarithmic amplification circuit; an output end of the logarithmic amplification circuit is connected to an input end of the signal filtering and shaping circuit; and an output end of the signal filtering and shaping circuit outputs a transformed AD sampling signal. The echo signal processing circuit can achieve real-time online measurement, is fast in response speed, is high in resolution ratio, is good in noise suppression ability, and is stable and reliable in detection performance.

Description

technical field [0001] The invention belongs to a signal processing circuit, in particular to an echo signal processing circuit of an ultrasonic level meter. Background technique [0002] One of the most commonly used level measurement methods is the use of ultrasonic level gauges for non-contact detection. Compared with other methods, the ultrasonic level meter has the advantages of simple structure, convenient installation, good real-time performance, strong adaptability to harsh environments, and less susceptible to light, dust, smoke and electromagnetic interference. However, the measurement resolution of the existing ultrasonic liquid level gauge is relatively low, the general resolution is 3.5mm ~ 5mm, although it can meet the general requirements of industrial automatic control, it cannot meet the requirements of other systems that have higher requirements for measuring material level. . [0003] The obvious disadvantage of the existing technology is that the ultras...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an echo signal processing circuit of an ultrasonic level meter with real-time online measurement, fast response speed, high resolution, good noise suppression ability, and stable and reliable detection performance, so as to solve the problem of large errors in the prior art. , low resolution and poor reliability

Images