Suspension particle concentration detection system based on ultrasonic waves

Abstract

The invention discloses a suspension particle concentration detection system based on ultrasonic waves. The system comprises an ultrasonic wave sensor, a power amplification circuit, an ultrasonic wave transducer, an analog-digital conversion unit and a micro-controller module which are sequentially connected, wherein the micro-controller module is further connected with a button input unit and a display unit; the ultrasonic wave sensor comprises an ultrasonic wave transmitting circuit and an ultrasonic wave receiving circuit; the ultrasonic wave transmitting circuit comprises an oscillator, a constant current transmitting path, a first command transmitting circuit and an ultrasonic wave transmitting probe which are sequentially connected; the ultrasonic wave receiving circuit comprises an ultrasonic wave receiving head, an amplification circuit, a shaping circuit and a second command transmitting circuit which are sequentially connected. The system disclosed by the invention is relatively strong in anti-interference performance, and can accurately acquire related detection data and analyze and operate the data through a microprocessor to obtain the suspension particle concentration. A digital frequency synthesis technique is directly introduced to the ultrasonic wave transmitting circuit, so that the measuring stability and the measuring precision are greatly improved.

Description

Technical field [0001] The invention relates to an automatic detection system, in particular to an ultrasonic-based suspension particle concentration detection system, belonging to the field of automatic detection. Background technique [0002] The concentration of suspension is an important process control parameter in the operation of water supply plants and sewage plants. The traditional manual sampling chemical drying analysis method has low efficiency and long measurement period, and it is difficult to play a role in process control. For this reason, people have developed sludge concentration measuring instruments based on optical, ray, vibration, and ultrasonic methods. Especially the ultrasonic attenuation method sludge concentration measuring instrument is widely used in the field of sewage treatment. Due to the large changes in environmental conditions in practical applications and the wide range of temperature of the measured sludge, it is difficult for the existing sl...

AI Technical Summary

Problems solved by technology

But a key factor is that temperature has a great influence on the speed of sound, which will directly affect the measurement accuracy of liquid concentration

In order to overcome the influence of temperature on the measurement accuracy, the method of directly comparing the data at different temperatures is often used to reduce the measurement error. However, this method not only has a large amount of data storage, the calculation process is complicated, and it is impossible to establish the relationship between sound velocity and temperature. Corresponding relationship, the external interference is often misdetected and cannot be ruled out

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