CN110951603A

CN110951603A - A rapid detection device for water quality

Info

Publication number: CN110951603A
Application number: CN201911314024.3A
Authority: CN
Inventors: 孙吉勇; 梁凤飞; 沈玮栋
Original assignee: Sujing Group Automation Instrument Equipment Corp; Jiangsu Sujing Group Co Ltd
Current assignee: Sujing Group Automation Instrument Equipment Corp; Jiangsu Sujing Group Co Ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-04-03

Abstract

The invention discloses a water quality rapid detection device, which comprises a flow cell, a liquid channel which is positioned in the flow cell and is used for liquid to pass through, a light source for generating light, a collimating lens for converging the light to the liquid channel and a photoelectric detector, wherein the photoelectric detector comprises a first detection unit for collecting the light penetrating through a detection light spot and generating a first electric signal, a second detection unit for collecting the light scattered by the detection light spot and generating a second electric signal and a detection circuit for analyzing the first electric signal and the second electric signal respectively and calculating the concentration and the particle size of particles in the liquid at the light spot, when water flows through the flow cell, the invention can continuously detect the concentration of real-time microorganisms, and when the number of certain microorganisms in water is suddenly increased, the number of the particles in the corresponding particle size range is also suddenly increased, therefore, can detect and early warning control the microorganism quantity in the aquatic through this practicality.

Description

Quick water quality detection device

Technical Field

The invention relates to the field of water quality monitoring, in particular to a water quality rapid detection device based on a particle counting principle.

Background

Water pollution and water quality detection are important contents for environmental management. The parameter factors of water pollution are many, and the microbial pollution is a very key index. The number of microorganisms such as cryptosporidium, giardia, escherichia coli and the like in the self-contained water is usually required to be controlled to eliminate potential harm and ensure the safety of drinking water.

Typically cryptosporidium has a size of around 5 microns and giardia has a size of around 10 microns, whereas most bacteria typically have a size between 0.5 and 5 microns and cannot be observed by the naked eye.

The existing bacteria detection is generally performed by culturing bacteria and then counting cultured colonies. This method is very time consuming and not suitable for rapid detection on site. When a sudden bacterial contamination accident occurs, the method is useless. Real-time rapid and low-cost detection schemes for bacteria have been the direction of continuous efforts of researchers.

Therefore, there is a need for a water quality monitoring device that can quickly monitor the condition of microorganisms in water.

Disclosure of Invention

The invention aims to provide a water quality detection device capable of rapidly monitoring the condition of microorganisms in water.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a quality of water short-term test device, its includes the flow cell, is located be the liquid channel that supplies liquid to pass through in the flow cell, produce the light source of light, will light assembles to liquid channel's collimating lens and photoelectric detector, collimating lens assembles the light that the light source produced to liquid channel, liquid in the liquid channel is in form a detection facula under the shining of light, photoelectric detector pierces through including the collection detect the light of facula and produce the first detecting element of first signal of telecommunication, collect detect facula scattered light and produce the second detecting element of the second signal of telecommunication and analyze respectively first signal of telecommunication with the second signal of telecommunication calculates particulate matter concentration and particle size's detection circuitry in the liquid of facula department.

Preferably, the photodetector is an array detector, and the first detection unit and the second detection unit are part of pixels of the array detector.

Further preferably, the flow cell has a flat first outer wall, the first outer wall is perpendicular to the liquid channel, and the photodetector is attached and fixed to the first outer wall.

Further preferably, the first detection unit and the first detection unit are both rectangular pixels, and two pixels of the second detection unit are respectively arranged on the side edges of the two opposite sides of the first detection unit.

Further preferably, a longitudinal direction of the first detection unit and a longitudinal direction of the liquid passage are perpendicular to each other.

Further preferably, the flow cell further has a second outer wall parallel to the first outer wall, and the light passes through the collimating lens and then enters the flow cell perpendicularly to the second outer wall.

Further preferably, the light passes through the liquid channel and then enters the first detection unit.

Further preferably, part of the scattered light generated after the light is incident into the liquid channel is incident into the second detection unit.

Preferably, the first detection unit has a measurement range of 5 to 100 micrometers.

Preferably, the second detection unit has a measurement range of 0.3 to 5 micrometers.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

1. according to the invention, the first detection unit and the second detection unit are arranged, so that the concentration of microorganisms with larger diameters is monitored by the first detection unit, and the concentration of microorganisms with smaller diameters is monitored by the second detection unit, thereby covering the range of the sizes of microorganisms to be detected in tap water detection.

2. When water flows through the flow-through cell, the invention can continuously detect the concentration of real-time microorganisms, and when the quantity of certain microorganisms in water is increased suddenly, the quantity of particles in the corresponding particle size range is increased suddenly, so that the quantity of microorganisms in water can be detected and early-warning monitored by the utility model.

3. The invention directly and closely attaches the array detector on the surface of the flow cell, has simple structure, convenient realization and low cost.

Drawings

FIG. 1 is a schematic diagram of the principle of the present invention;

FIG. 2 is a schematic diagram of the detection principle of the present invention;

FIG. 3 is a surface pixel distribution diagram of an array detector;

fig. 4 is a schematic diagram of pixel connection and signal output.

In the above drawings: 1. a light source; 2. a collimating lens; 3. a flow-through cell; 401. a first detection unit; 402. a second detection unit; 5. a detection circuit.

Detailed Description

The invention will be further described with reference to examples of embodiments shown in the drawings to which:

referring to fig. 1 and 2, a rapid water quality detection device includes a flow cell 3, a liquid channel 301 located in the flow cell 3 for liquid to pass through, a light source 1 for generating light, a collimating lens 2 for converging the light to the liquid channel 301, and a photodetector, wherein the collimating lens 2 converges the light generated by the light source 1 to the liquid channel 301, and the liquid in the liquid channel 301 forms a detection light spot under the irradiation of the light. The photodetector is an array detector and has a first detecting unit 401 and a second detecting unit 402, and the first detecting unit 401 and the second detecting unit 402 are part of pixels of the array detector.

The first detecting unit 401 receives light penetrating through the detecting light spot and generates a first electric signal, the second detecting unit 402 receives light spot scattered light and generates a second electric signal, the photoelectric detector further comprises a detecting circuit 5 which respectively analyzes the first electric signal and the second electric signal and calculates the concentration and the size of particles in liquid at the light spot, and an alarm circuit (not shown) which gives an alarm when the concentration of the particles in the liquid detected by the detecting circuit 5 is stirred. The first detection unit 401, the second detection unit 402, the detection circuit 5 and the alarm circuit are all in the prior art, and those skilled in the art can purchase appropriate accessories according to the content of the embodiment to implement the method specifically.

Referring to fig. 4, the first detection unit 401 transmits a first electrical signal to the detection circuit 5 through the first port 403a, and the detection circuit 5 calculates the concentration and size of the particulate matter through a second electrical signal; the two parts of the second detection unit 402 combine the second electrical signals and transmit the combined second electrical signals to the detection circuit 5 through the second port 403b, and the detection circuit 5 calculates the concentration and size of the particulate matters through the second electrical signals. The first detection unit 401 and the second detection unit 402 share one detection circuit 5 to save the cost of the apparatus.

In the present embodiment, the measurement range of the first detection unit 401 is 5 micrometers to 100 micrometers. The second sensing unit 402 measures in the range of 0.3 microns to 5 microns. Thereby covering the range of the size of the microorganism to be detected in tap water detection. Can ensure that all microorganisms are detected by military equipment.

When rivers pass through flow-through cell 3, this embodiment can continuously detect real-time microorganism concentration, when the quantity of certain microorganism of aquatic increases suddenly, and the particulate matter quantity in its particle size range that corresponds also can increase suddenly thereupon, consequently, can detect and the early warning control the microorganism quantity in the aquatic through this practicality.

In this embodiment, referring to fig. 2 and 3, the flow cell 3 has a flat first outer wall, the first outer wall is perpendicular to the liquid channel 301, and the photodetector is attached and fixed to the first outer wall. The first detection unit 401 and the first detection unit 401 are both rectangular pixels, and two pixels of the second detection unit 402 are arranged and respectively arranged on the sides of two opposite sides of the first detection unit 401. Because this embodiment is direct with the surface of closely laminating at flow-through cell 3 of array detector, simple structure, convenient, the with low costs of realization.

Wherein the length direction of the first detection unit 401 and the length direction of the liquid channel 301 are perpendicular to each other. The flow cell 3 also has a second outer wall parallel to the first outer wall, and light rays pass through the collimating lens 2 and then enter the flow cell 3 perpendicularly to the second outer wall. To ensure that the light penetrating the liquid channel 301 falls within the range of the first detection unit 401, increasing the accuracy of detection.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A rapid detection device for water quality, comprising a flow cell, a liquid channel for liquid to pass through in the flow cell, a light source for generating light, a collimating lens and a photodetector for converging the light into the liquid channel, so The collimating lens gathers the light generated by the light source into the liquid channel, and the liquid in the liquid channel forms a detection spot under the illumination of the light, and it is characterized in that: the photodetector includes a collection of light that penetrates the detection spot. a first detection unit that collects the light scattered by the detection spot and generates a first electrical signal, a second detection unit that collects the scattered light from the detection spot and generates a second electrical signal, and analyzes the first electrical signal and the second electrical signal respectively and calculates A detection circuit for particle concentration and particle size in the liquid at the light spot is output.

2 . The device for rapid water quality detection according to claim 1 , wherein the photodetector is an array detector, and both the first detection unit and the second detection unit are the array detector. 3 . part of the pixels.

3 . The device for rapid water quality detection according to claim 2 , wherein the flow cell has a flat first outer wall, the first outer wall and the liquid channel are perpendicular to each other, and the photodetector It is fitted and fixed on the first outer wall.

4 . The device for rapid detection of water quality according to claim 3 , wherein the first detection unit and the first detection unit are both rectangular pixels, and the pixel of the second detection unit is set to There are two, which are respectively arranged on the sides of the two opposite sides of the first detection unit.

5 . The device for rapid water quality detection according to claim 4 , wherein the length direction of the first detection unit and the length direction of the liquid channel are perpendicular to each other. 6 .

6 . The device for rapid detection of water quality according to claim 5 , wherein the flow cell further has a second outer wall parallel to the first outer wall, and the light passes through the collimating lens and is perpendicular to the The second outer wall projects into the flow cell.

7 . The device for rapid detection of water quality according to claim 6 , wherein the light enters the first detection unit after passing through the liquid channel. 8 .

8 . The device for rapid detection of water quality according to claim 6 , wherein part of the scattered light generated after the light enters the liquid channel enters the second detection unit. 9 .

9 . The device for rapid detection of water quality according to claim 1 , wherein the measurement range of the first detection unit is 5 microns to 100 microns. 10 .

10 . The device for rapid detection of water quality according to claim 1 , wherein the measurement range of the second detection unit is 0.3 microns to 5 microns. 11 .