Intelligent turbidity instrument

Abstract

The invention discloses an intelligent turbidimeter which connects the light signal to a silicon photocell and then serially connects to the input of a single-chip microcomputer to process the signal; the output of the single-chip microcomputer is connected with an LCD screen and a field bus; the field bus sends the processed signal to the host of the turbidimeter; a conditioning circuit is serially connected between the silicon photocell and the single-chip microcomputer; the conditioning circuit is a matching circuit consisting of an amplifying circuit and a voltage follower which are connected by a resistor; the input and the output of an amplifier are parallely connected with a first feedback resistor; an adjustable resistor is connected between two legs of the amplifier; the input and the output of the voltage follower are parallely connected with a second feedback resistor; the input of the voltage follower is connected with a slide rheostat (P201); the slide rheostat (P201), a capacitor (C201), an electrolytic capacitor (E201) and a three-terminal voltage stabilizer are connected parallely; the voltage follower makes the output resistance close to zero and the output voltage stable, to provide a static working point for transporting and placing an internal transistor; the output signal is not distorted; the anti-interference capability is strong; the current offset is low; and the noise is low.

Description

technical field [0001] The invention relates to a turbidity detection device, which is mainly used in the fields of water environment monitoring, aquaculture, biological fermentation engineering and the like. Background technique [0002] At present, there are two kinds of turbidity detection devices that are widely used. One is the scattered light online turbidimeter, which is an instrument that compares scattering and transmission with multiple optical paths to measure the color and turbidity of liquids. Its working principle is to make use of the scattered light of suspended particles in the liquid without being affected by the chromaticity of the liquid, and let the photocell receive the scattered light and transmitted light of the liquid to be measured for comparison and measurement, and obtain the chromaticity value and turbidity value of the liquid to be measured respectively. The scattered light signal obtained by the sensing part is comprehensively processed by the ...

AI Technical Summary

Problems solved by technology

However, these two turbidimeters have defects in detection. First, because the detected signal is only relatively weak at the μA level, the entire instrument has poor anti-interference ability and poor measurement accuracy.

Second, most of them are desktop turbidimeters, which can only be used for sampling measurement, and cannot continuously measure the turbidity of flowing liquids.

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