A system and method for measuring sediment concentration in a water body using an optical fiber sensor

Abstract

The invention provides a system and method for measuring the concentration of sediment in a water body by using an optical fiber sensor, comprising: an ultrasonic transducer, an optical fiber sensor and a data processing module; the ultrasonic transducer is used to emit ultrasonic waves into the water body; the optical fiber sensor is used to receive incident Light and perceive the ultrasonic signal emitted by the ultrasonic transducer after being reflected by the sediment in the water body, and output the optical signal to the data processing module; the data processing module receives the optical signal output by the optical fiber sensor, and compares the optical signal before and after the operation of the ultrasonic transducer The phase and polarization of the signal change, and the sediment concentration in the water body is obtained through processing. The invention can realize the sediment measurement work of the water sample under the condition of high sediment concentration, and the measurement range of the sediment concentration is 10g / l-500g / l.

Description

technical field [0001] The invention belongs to the technical field of hydraulic engineering, and relates to a system and a method for measuring the sediment concentration in a water body by using an optical fiber sensor. Background technique [0002] The problem of sediment content in natural water bodies is related to many aspects such as water conservancy machinery, agricultural irrigation, river channel evolution, navigation and ecological environment. Dynamic measurement and calibration of sediment content is critical. Determination of sediment content in water bodies is one of the important indicators for water quality monitoring. Especially in the northwest region of my country, the high sediment content of the Yellow River has always been the concern of many hydraulic scholars. [0003] At present, the measurement of sediment concentration is mainly divided into three categories. The first is the traditional water sampling method. On several representative vertic...

AI Technical Summary

Problems solved by technology

The focusing performance of this kind of transducer is far inferior to that of optical instruments, and the detection accuracy is small. When imaging sediment particles, the resulting light spots are large, and the resolution of the resulting sediment particle images is low, and it is impossible to identify particles under high sediment concentration conditions. For sediment particles, the color purity of the image is easy to be saturated, and the resulting sediment particles have darker spots, which cannot be accurately distinguished from the background, so most of them can only be used for sediment measurement work under low concentration conditions, and the measurement concentration range is about 5g / l -10g / l, and the test results are greatly affected by the size and speed of sediment particles

Images