Turbidity transducer

Abstract

The invention discloses a turbidity transducer relating to the technical field of transducer measurement. The turbidity transducer comprises an optimal measurement module, a temperature measurement module, a TEDS (Transducer Electronic Data Sheet) storage and a microprocessor, wherein the optimal measurement module is used for acquiring turbidity signals of water bodies; the temperature measurement module is used for acquiring temperature signals of the water bodies; the TEDS storage is used for storing TEDS parameters, and the TEDS parameters include calibrated compensating parameters of the relationship of reflecting temperature and turbidity; and the microprocessor is connected with the optimal measurement module, the temperature measurement module and the TEDS storage and used for carrying out analog-to-digital conversion treatment on turbidity voltage signals and temperature voltage signals and calculating a turbidity value generated by the analog-to-digital conversion treatment according to the calibrated compensating parameters. The turbidity transducer can realize the temperature compensation of measured turbidity, thereby enhancing the turbidity measuring accuracy; and in addition, the invention has self-cleaning function and can be used for carrying out on-line measurement on water turbidity.

Description

technical field [0001] The invention relates to the technical field of sensor measurement, in particular to a turbidity sensor. Background technique [0002] Turbidity is used to represent the effect of impurities such as suspended solids, colloidal substances, and microorganisms in water of different sizes, shapes, and specific gravity on light. Turbidity is not only the most important physical appearance index of water quality, the level of turbidity also means the content of various toxic and harmful substances in water. Due to the existence of suspended solids and other substances in the water, the water body presents an opaque state, and turbidity measurement is to measure the degree of turbidity of the water body. When a beam of incident light is shot into the water, due to the existence of suspended matter in the water, optical scattering occurs on the suspended matter, and the value of turbidity is determined according to the intensity of the scattered light in the ...

AI Technical Summary

Problems solved by technology

[0004] Existing turbidity sensors are equipped with light emitters and photoelectric receivers, and the photoelectric characteristics of the light emitters and photoelectric receivers have a great relationship with temperature. When the temperature changes, the measurement results of turbidity will deviate.

In addition, in the turbidity sensor, the light emitted by the light transmitter and the light received by the photoelectric receiver must pass through the window glass. During long-term use, the window glass will inevitably be polluted by suspended solids, which will seriously affect the measurement results. accuracy, so the turbidity sensor must have the function of removing these dirt

Existing methods for removing dirt include mechanical removal. For example, Chinese patent document CN2694263Y discloses a seawater on-site monitoring turbidity sensor, which uses a mechanical brush to remove dirt on the window glass. During long-term use, the mechanical brush will inevitably Abrasion of the window glass will affect the light transmission effect of the window glass, so as to affect the accuracy of the measurement results

In addition, there is a method of ultrasonic cleaning of window glass. For example, Chinese patent document CN2472225Y discloses a kind of online turbidimeter detector, which makes the dirt on the window glass come off by ultrasonic vibration and is taken out of the detector with the flowing water sample. It is only suitable for flowing water bodies. For non-flowing water bodies (such as aquaculture waters), the shed dirt will accumulate at the bottom of the detector, which will affect the use of the detector and the accuracy of measurement.

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