Liquid suspended matter concentration measuring method and device based on ultrasonic power spectrum estimation

Abstract

The invention discloses a liquid suspended matter concentration measuring method based on ultrasonic power spectrum estimation.The method is characterized by comprising the following steps of obtaining characteristics of a transmitting-receiving probe; sending LFM signals section by section; receiving measuring signals; conducting power spectrum estimation on the received measuring signals; calculating relative size of the suspended solid dimension and relative distribution of SSC.According to the measuring method, wide-frequency-band LFM ultrasonic signals are utilized for constructing measuring signals, the measuring signals are reflected, diffracted and the like by suspended solids when diffused in liquid, the received signals generate frequency spectrum attenuation relative to the measuring signals, spectrum analysis is performed on the received signals through the method based on the power spectrum estimation, and the relative size of the suspended solid dimension in liquid and relative distribution of the concentration are estimated on the basis of the attenuation frequency spectrum.

Description

technical field [0001] The invention relates to the measurement of the concentration of suspended matter in liquid, in particular to a method and device for measuring the concentration of suspended matter in liquid based on ultrasonic power spectrum estimation. Background technique [0002] In recent years, the problem of excessive suspended solids in water bodies has become more and more serious. Since excessive suspended solids will seriously endanger the health of organisms and the development of the ecological environment, people have also paid more attention to the detection and evaluation of water quality, and put forward many measures to measure the concentration of suspended solids (hereinafter referred to as SSC) method. At present, the commonly used methods for measuring SSC include filter gravimetric method, acoustic method, optical method and remote sensing technology. [0003] First, the filter gravimetric method measures SSC through sampling, filtering, drying...

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Problems solved by technology

However, most of this method uses single-frequency signals or narrow pulse signals. Although narrow pulse signals have broadband characteristics, they are not easy to generate, and they are not broadband signals with equal frequency spectrum. In addition, even if broadband signals are used in this method, the measurement devices used are mostly With one transducer, the bandwidth of sending and receiving signals is limited by the transducer

Third, the optical method uses the attenuati

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