Suspended sediment concentration analysis device and method based on multi-frequency acoustics

Abstract

The invention discloses a suspended sediment concentration analysis device and method based on multi-frequency acoustics, and the method is characterized in that an FPGA (Field Programmable Gate Array) outputs four paths of ultrasonic alternating current signals which are respectively connected with 500KHZ, 1MHZ, 2MHZ and 4MHZ transmit-receive integrated ultrasonic transducers; the four paths of transmitting circuits are used for sequentially transmitting and outputting measurement signals with different frequencies; according to the receiving circuit, ultrasonic echo signals are received by four ultrasonic transmitting and receiving integrated transducers, then the ultrasonic echo signals are sequentially selected to correspond to output and input signals through four analog selection switches, analog signals with certain waveforms are obtained through analog signal amplification and automatic gain adjustment, the analog signals enter an AD high-speed conversion chip, the analog signals are converted into digital signals, and the digital signals are read by an FPGA. According to the underwater silt concentration measuring device, the multi-frequency sound system and the multi-transmitting and multi-receiving sound system are combined, and the silt concentration in different underwater radial ranges is measured. The functions of water depth measurement, water flow velocity measurement, water temperature measurement and the like can be realized through the pressure sensor and the temperature sensor. The probe adopts a watertight structure, is pressure-resistant and waterproof, and is convenient for long-term underwater monitoring.

Description

technical field [0001] The invention relates to the field of particle measurement, in particular to a device and method for analyzing the concentration of suspended sediment based on multi-frequency acoustics. Background technique [0002] The problem of sediment particles in natural water bodies is related to many aspects such as hydraulic machinery, riparian agriculture, land and sea resources, and ecological environment. Accurate measurement of particle size in liquids is critical in many areas of industrial production, including medical pharmaceuticals, energy transportation, and more. The traditional methods for measuring the particle size of suspended particles include weighing method, particle size meter method, pipette method, sieving method, extinction method and centrifugation method. The currently widely used particle measuring methods are: sieving method, microscope method, sedimentation method, electric induction method (Coult method), light scattering method, ...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the problem that the suspended sediment concentration analysis device in the prior art cannot detect differences in the sediment concentration in different radial ranges underwater, and provides a suspended sediment concentration analysis device based on multi-frequency acoustics and method

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