Water quality detection system based on AC detection

A water quality detection and wave detection technology, which is applied in the water quality detection system and the signal processing field of water quality detection, can solve the problems of poor accuracy of detection results, achieve high accuracy and improve the effect of signal detection ability

Inactive Publication Date: 2014-09-10
苏州威阳环保科技有限公司
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the light source generally adopts a DC drive mode, and the light intensity detector is mostly a simple filter. This method of measuring the concentration of the target substance in water by detecting the change of the DC signal is easily affected by the background light and the dark current of the photoelectric converter. The influence of DC and low-frequency interference signals such as the bias signal of the circuit itself and the bias signal of the circuit itself, the accuracy of the detection results is poor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Water quality detection system based on AC detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0020] Embodiment: a kind of water quality detection method based on AC wave detection, its steps are as follows:

[0021] (1) The light source controller 1 outputs an alternating voltage or current driving signal;

[0022] (2) Under the action of the driving signal, the light source 2 sends out an initial optical signal with the same frequency and constant amplitude as the driving signal;

[0023] (3) The absorption amplitude of the initial optical signal passing through the sample cell 3 becomes smaller, and the remaining optical signal is obtained;

[0024] (4) The remaining optical signal is converted into a corresponding electrical signal by the photoelectric converter 4, the frequency of this electrical signal is the same as the frequency of the initial optical signal, and the amplitude becomes smaller due to the absorption of the sample cell 3;

[0025] (5) The electrical signal passes through the AC wave detector 5, and the background light signal output by the sample...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a water quality detection system based on AC detection. The water quality detection system is characterized by comprising a light source controller, a light source, a sample cell, a photoelectric converter, an AC detector and an MCU, wherein the light source controller outputs an alternating voltage or current driving signal to drive the light source to work, the light source emits an initial AC optical signal with an amplitude consistent with the driving signal under the driving of the light source controller, the photoelectric converter can convert a residual optical signal absorbed by the sample cell into an electric signal consistent with residual light intensity, the AC detector is used for filtering an interference signal, detecting a useful electric signal and outputting detection results to the MCU, and the MCU calculates the concentration of a target substance in the sample cell through operation. The water quality detection system is not influenced by backlight, the dark current of the photoelectric converter and bias of a circuit, can effectively improve signal detection capability and has detection accuracy far higher than that of a common DC detection system.

Description

technical field [0001] The invention belongs to the field of water quality detection and relates to a signal processing method for water quality detection, in particular to a system for realizing water quality detection by detecting light intensity changes through AC detection. Background technique [0002] Under different conditions, the wavelength, intensity, and polarization state of the absorption or emission spectra of material molecules are different, which has an inherent relationship with the structural characteristics of the material. The molecular structures of different substances are different, and the intensities corresponding to the absorption and emission spectra are different; when the concentration of the same substance is different, the absorption intensity at the same absorption peak position will also be different. Therefore, by detecting the absorption degree of a certain substance in water to light of a specific wavelength, the composition and concentra...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 谢明明李伟沈建强李红丽
Owner 苏州威阳环保科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap