Portable sediment concentration measuring method and device based on optical principle

Abstract

The invention relates to a sediment observation method and device for river engineering model sediment test and onsite river. According to the technical scheme, a portable sediment concentration measuring method based on the optical principle comprises the following steps that (1) a plurality of optical measuring points arranged in the length direction of a rod piece are arranged on at least one measuring rod piece, wherein each optical measuring point comprises a transmitting probe and a receiving probe; 2) a box is also fixed on the measuring rod piece, a control panel, a power supply module, an infrared laser generator, a signal processing module, a data storage module and an inclination sensor are arranged in the box, the receiving probe of each measuring point is communicated with theoptical signal processing module through an optical fiber and then is electrically connected with the control panel; and (3) the measuring rod piece vertically stretches into water flow, and after light reflection signals of all positions of different depths are measured at the same time, processed sediment content data are transmitted to the control panel through the signal processing module. The method and the device have the characteristics of being convenient to operate and accurate in measurement.

Description

Technical field[0001]The invention relates to a river model sediment test and an on-site river sediment observation method and device, in particular to a portable method and device for measuring sediment concentration.Background technique[0002]Sediment research is an important research direction in the study of river and land governance, and it is also a key indicator of offshore marine environmental governance. In sediment research, it is necessary to study the transfer trajectory of sediment and the amount of sediment transport. The specific method of research is to study sediment The concentration change and radiation range in the movement process are used to determine the amount and movement trend of sediment. Therefore, the measurement of sediment concentration is of great significance in sediment research.[0003]At present, the direct weighing method is generally used to measure the sediment concentration. The specific method is: first take a certain amount of sample, and then ...

AI Technical Summary

Problems solved by technology

However, in muddy water with high concentration, the ultrasonic signal attenuates sharply, and the signal is difficult to detect. In addition, in muddy water with complex sediment media, the reflection signal will be greatly enhanced when the ultrasonic encounters larger sediment particles, resulting in inaccurate measurement. , so the Doppler densitometer is generally used in occasions where the concentration is moderate and the sediment particles are relatively uniform

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