Reagent metering device for ammonia nitrogen detection based on machine vision

Abstract

The invention discloses a reagent metering device for ammonia nitrogen detection based on machine vision. The device comprises an ARM embedded system, a peristaltic pump, a camera obscura, a metering pipe, a machine vision light source, a macroshot camera, a video capture module, a plurality of reagents and a water sample storage tank, wherein the reagents and the water sample storage tank are connected with the metering pipe through the peristaltic pump, the metering pipe is installed in the camera obscura, the machine vision light source and the macroshot camera are installed in the camera obscura, the macroshot camera is connected with the video capture module, and the ARM embedded system is connected with the peristaltic pump and the video capture module. The system structure is simplified, the influence of bubbles, stray light, heavily polluted water samples and turbid water samples on metering accuracy can be effectively avoided, the device is also suitable for the situation that multiple volumes need to be metered, the metering accuracy of the device is improved, later-stage maintenance amount is reduced, and the device is suitable for long-term online automatic ammonia nitrogen detection.

Description

technical field [0001] The invention relates to water quality ammonia nitrogen content detection technology in the field of industrial technology, in particular to a machine vision-based reagent metering device for ammonia nitrogen detection. Background technique [0002] With the development of society and the prosperity of economy, computer technology has been more and more widely used. One of the key indicators for evaluating water pollution status is to detect the ammonia nitrogen content of water quality. Nitrogen is one of the main nutrients for water eutrophication, and the ammonia nitrogen content reflects the degree of water eutrophication. The commonly used automatic online detection technology for ammonia nitrogen is the spectrophotometric method based on the Nessler reaction. Nessler's spectrophotometry is based on Nessler's reaction. Nessler's reagent reacts with ammonia nitrogen in the water sample to generate a brown-red compound, which can be used to calcula...

AI Technical Summary

Problems solved by technology

In the Nessler reaction, the ratio of the measured water sample to the reagent is very important, which affects the chromaticity of the reaction compound. The commonly used reagent metering device adopts a photoelectric detection device. Infrared receiving tube, when the liquid level of the reagent passes through its detection position, the photoelectric circuit can detect the signal formed by the liquid level blocking the infrared rays, and judge the capacity of the reagent in the measuring tube based on this, but this detection device is susceptible to external infrared stray light More seriously, when the metering tube has air bubbles, the photoelectric detection device will generate a malfunction signal, seriously affecting the reliability and accuracy of the entire system

In addition, when the system needs to detect and measure multiple capacities, it is necessary to add photoelectric detection circuits in groups accordingly, the system is complex, and it is not easy to calibrate each measurement unit

If the water sample to be tested is highly polluted or the water sample is turbid, the photoelectric detection device may fail, and the reagent measurement test cannot be completed.

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