Method for measuring particle size distribution of discrete state particles based on continuous wave and burst wave

Abstract

The present invention relates to a method for measuring particle size distribution of discrete state particles based on a continuous wave and a burst wave. According to the method, a computer edits a continuous wave and a burst wave; waveform signals are output; an excitation electrical signal is emitted through a signal generator; power amplification and circuit amplification are performed; an excitation transducer emits ultrasonic waves; the ultrasonic waves pass through a sample requiring measurement in a measurement zone, and are captured by a receiving transducer on the opposite side; the captured ultrasonic waves are subjected to signal amplification and analog-to-digital conversion, and transmitted to a computer to be processed, wherein the signal amplification is performed by a signal processing circuit, and the analog-to-digital conversion is performed by a high speed analog-to-digital conversion circuit; a penetrating beam path change method is adopted to measure an acoustic attenuation signal, an acoustic attenuation coefficient of the particle sample is calculated, and particle size distribution and concentration of the high concentration and high attenuation particles are calculated based on the acoustic attenuation spectrum, wherein the measurement signal is clear. With the present invention, rapid measurement of particle size distribution of discrete state particles is achieved.

Description

technical field [0001] The invention relates to an ultrasonic measurement technology, in particular to a method for measuring the size distribution of discrete particles based on continuous waves and burst waves. Background technique [0002] The measurement of particle size and concentration of dispersed particles has a wide application background in the fields of power, chemical industry, medicine, environmental protection, water conservancy, materials and other fields involving two-phase flow. Compared with existing measurement methods such as sieving method, microscope method, holographic method, electric induction method, sedimentation method, etc., ultrasonic method often has a high degree of automation and can perform fast and accurate measurement. At the same time, because ultrasonic has a wide frequency range and strong penetrating ability, it can propagate in colored or even opaque substances and has fast measurement speed. Ultrasonic sensors are low in price and r...

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Problems solved by technology

In the process of measuring high-concentration and high-attenuation substances, the sound path of ultrasonic waves is limited, so that the signal-to-noise ratio of the measurement signal is too small, and even effective acoustic signals cannot be detected, and the measurement process cannot be realized.

[0004] At the same time, most of the existing methods use ultrasonic pulse excitation, which is difficult to obtain effective signals in the case of high concentration and high attenuation, while the ultrasonic transducer under continuous wave and burst wave excitation can emit ultrasonic waves with sufficient sound intensity. signal for particle size measurement in high-concentration samples

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