CN-121978003-A - Non-contact algae online detection system and method thereof

CN121978003ACN 121978003 ACN121978003 ACN 121978003ACN-121978003-A

Abstract

The invention relates to a non-contact algae online detection system and a method thereof, wherein the system comprises a shell; the light source emission assembly is positioned at the upper side of the measuring opening, the light source driving plate is electrically connected with the light source, the glass sheet and the emission optical axis of the light source emission assembly are arranged at an included angle of 45 degrees, the reference light detector is arranged at one side of the glass sheet reflecting light, the emission lens is arranged at one side of the glass sheet refracting light, the focus of the light source converged through the emission lens is positioned at the lower side of the liquid surface of the measuring opening, the fluorescent detection assembly is positioned at the upper side of the measuring opening, the receiving circuit board is electrically connected with the receiving detector, the receiving diaphragm and the receiving lens are sequentially arranged at one side of the receiving detector close to the measuring opening, the emission optical axis of the light source emission assembly and the receiving optical axis of the fluorescent detection assembly are vertically arranged, and the intersection point is positioned at the lower side of the liquid surface of the measuring opening, so that non-contact algae detection is realized.

Inventors

JIN YONGXUAN
WU XIAOWEN
ZHANG SHAOHUA
LI CHAO
Qiu Fangbo
CHEN GUANG
WANG YIANG
ZHOU YILUN
GU CHAOGUANG
YAO JUN

Assignees

北控(杭州)环境工程有限公司
苏州奥特福环境科技有限公司

Dates

Publication Date: 20260505
Application Date: 20251212

Claims (10)

1. A non-contact algae online detection system, comprising: a housing (1); a measuring cylinder (2) which is obliquely arranged in the shell (1), wherein the measuring cylinder (2) is provided with a measuring opening (21) which is horizontally arranged; The light source emission assembly (3) is positioned on the upper side of the measurement opening (21) and comprises a light source driving plate (31), a light source (32), a reference light detector (33), a glass sheet (34) and an emission lens (35), wherein the light source driving plate (31) is electrically connected with the light source (32), the glass sheet (34) and an emission optical axis of the light source emission assembly (3) are arranged at an included angle of 45 degrees, the reference light detector (33) is arranged on one side of the glass sheet (34) for reflecting light, the emission lens (35) is arranged on one side of the glass sheet (34) for refracting light, and a focus of a light beam of the light source (32) converged through the emission lens (35) is positioned on the lower side of the liquid level of the measurement opening (21); Fluorescence detection subassembly (4) are located the upside of measuring opening (21), including receiving circuit board (41), receiving detector (42), receiving diaphragm (43), receiving lens (44), receiving circuit board (41) with receiving detector (42) electricity is connected, receiving diaphragm (43) receiving lens (44) set gradually in receiving detector (42) be close to one side of measuring opening (21), the emission optical axis of light source emission subassembly (3) with the receiving optical axis of fluorescence detection subassembly (4) is perpendicular setting, and the intersection is located the liquid level downside of measuring opening (21).
2. The non-contact algae online detection system as claimed in claim 1, wherein the light source emission assembly (3) further comprises an emission diaphragm (36), an emission quartz glass plate (37), an emission heating plate (38), the emission diaphragm (36) being arranged between the light source (32) and the glass sheet (34), the emission quartz glass plate (37) being arranged at a side of the emission lens (35) facing the measurement opening (21), the emission heating plate (38) being fixed with the emission quartz glass plate (37).
3. The non-contact algae online detection system as claimed in claim 1, wherein the fluorescence detection assembly (4) further comprises a light filter (45), a receiving quartz glass plate (46) and a receiving heating plate (47), the light filter (45) is arranged between the receiving detector (42) and the receiving diaphragm (43), the receiving quartz glass plate (46) is arranged on one side of the receiving lens (44) facing the measuring opening (21), the receiving heating plate (47) is fixed with the receiving quartz glass plate (46), and the light sources (32) are arranged in two and symmetrically arranged on the light source driving plate (31).
4. The non-contact algae online detection system according to claim 1, wherein the measuring cylinder (2) comprises a cylinder body (22) and an overflow cylinder (23), the measuring opening (21) is formed on the upper side surface of the cylinder body (22), the overflow cylinder (23) is sleeved outside the cylinder body (22), and an overflow cavity (24) is arranged between the overflow cylinder (23) and the cylinder body (22).
5. A method for online detection of non-contact algae, characterized by using the non-contact algae online detection system as recited in any one of claims 1 to 4, comprising the steps of: S1, exploration is carried out on a target detection water area, point position deployment planning data are generated, a non-contact algae online detection system is installed according to the point position deployment planning data, a self-cleaning measurement waterway is constructed by adjusting the angle of a measuring cylinder, and component calibration is completed, and system deployment parameter data and measurement waterway steady-state data are generated; s2, driving double light sources to generate multi-wavelength modulation pulse impulse light according to data such as system deployment and the like, processing and converging the multi-wavelength modulation pulse impulse light to detection points, acquiring a reference signal by utilizing the characteristics of a glass sheet, and generating light source excitation parameter data and emission stability monitoring data by combining a water mist removal state; S3, based on the light source excitation parameter data, the fluorescence detection assembly gathers fluorescence signals, and the fluorescence signals are converted into electric signals through screening and amplified to generate noise reduction fluorescence electric signal data; S4, extracting effective signals according to data such as emission stability and the like, converting the effective signals into digital signals, calling a formula, combining light source attenuation data to automatically compensate, calculating concentration values of various algae, and generating multidimensional algae concentration initial measurement data; S5, verifying the self-cleaning effectiveness of the measuring cylinder, correcting the multi-dimensional algae concentration initial measurement data through the turbidity data, and judging algae proliferation and risk level by combining the historical data to generate final algae concentration detection data, classification duty ratio data and water quality safety early warning data.
6. The method of online detection of non-contact algae of claim 5, wherein S1 comprises: Based on the hydrologic characteristic data of the water area and the distribution diagram of the potential algae outbreak area, a differential point location deployment scheme is formulated by combining the application scene of the detection system, and point location deployment planning data is generated; Starting a water inlet loop, an overflow loop and a mud discharging loop of the measuring cylinder, constructing a dynamic self-cleaning measuring waterway, monitoring the flow and the stability of the waterway in real time, generating waterway operation initial data, synchronously calibrating the positions of the light source transmitting assembly and the fluorescent detecting assembly, ensuring that the transmitting optical axis is vertical to the receiving optical axis through a laser positioning technology, ensuring that the intersection point accurately falls in a preset detection area below the liquid level, and recording calibration parameters; And continuously monitoring the running state of the self-cleaning measuring waterway, and generating steady-state data of the measuring waterway after the flow and the liquid level are stable.
7. The method of online detection of non-contact algae of claim 5, wherein S2 comprises: The single chip microcomputer outputs PWM modulation signals to drive the light source to generate multi-wavelength modulation pulse impulse light so as to generate light source modulation control data; The light beam with multiple wavelengths after refraction is converged into a focused light beam by the transmitting lens, and the focused light beam is projected to a preset detection point below the liquid level to generate focused excitation light data; At the same time, the reflection characteristic of the glass sheet is utilized to reflect part of excitation light to a reference light detector, and a light source intensity reference signal is collected to generate light source original intensity data; And integrating the light source modulation control data, the focusing excitation light data, the light source original intensity data and the water mist removal state data to generate light source excitation parameter data and emission stability monitoring data.
8. The method of online detection of non-contact algae of claim 5, wherein S3 comprises: the fluorescence signals of the detection points are precisely converged through a receiving lens of the fluorescence detection assembly to generate converged fluorescence signal data, and the converged fluorescence signals are screened by a receiving diaphragm to filter out stray light rays of non-target angles and generate directional fluorescence signal data; the directional fluorescent signals sequentially penetrate through the quartz glass sheet and the red cut-off filter, interference signals are further filtered, and pure fluorescent signal data are generated; Transmitting the original fluorescence electric signal data to a receiving circuit board, removing high-frequency noise through a primary filtering amplifying circuit, enhancing the signal intensity and generating primary amplified fluorescence electric signal data; and performing deep gain processing on the primary amplified fluorescent electric signal data through a secondary amplifying circuit to generate noise-reduced fluorescent electric signal data.
9. The method of online detection of non-contact algae of claim 5, wherein S4 comprises: Based on PWM waveform parameters in the light source modulation control data, synchronous demodulation is carried out on the noise reduction fluorescent electric signal data, and an effective electric signal matched with the modulation excitation light frequency is extracted to generate synchronous effective electric signal data; Converting synchronous effective electric signal data from analog signals to digital signals through an analog-to-digital conversion module to generate fluorescent digital signal data, and converting original intensity data of a light source into digital intensity data of the light source by a reference detector according to the same processing flow to generate emission light source attenuation monitoring data; Calling a preset algae concentration calibration formula, namely, chl=a×VR+b, inputting a voltage value VR corresponding to fluorescent digital signal data, and primarily calculating an algae concentration value by combining a slope a and an intercept b calibrated by standard algae liquid in the early stage; According to the attenuation monitoring data of the emission light source, automatically compensating and correcting the preliminarily calculated algae concentration value, respectively calculating the concentration value of various algae, and generating multidimensional algae concentration initial measurement data.
10. The method of online detection of non-contact algae of claim 5, wherein S5 comprises: analyzing the related parameters, judging whether pollution residues exist on the inner wall of the measuring cylinder and the measuring opening, and generating self-cleaning effectiveness verification data; If the verification data show that the pollution risk exists, starting an emergency cleaning program to eliminate measurement deviation caused by waterway pollution; Starting an infrared LED light source, emitting infrared light to a detection water area, receiving scattered light signals generated by particles in the water body, and generating scattered light detection data; The method comprises the steps of firstly measuring algae concentration data of a water body, secondly correcting the algae concentration data of the multidimensional degree by utilizing water body turbidity correction parameters to generate corrected algae concentration data, retrieving historical monitoring data stored in a memory arranged in a system, carrying out time sequence trend analysis on the corrected algae concentration data, and calculating algae proliferation rate and change slope; And integrating the corrected algae concentration data, the algae classification duty ratio data and the risk level judgment result to generate final algae concentration detection data, classification duty ratio data and water quality safety early warning data, and uploading the final algae concentration detection data, the classification duty ratio data and the water quality safety early warning data to a monitoring platform.

Description

Non-contact algae online detection system and method thereof Technical Field The invention relates to the field of algae detection equipment, in particular to a non-contact algae online detection system and a non-contact algae online detection method. Background Algae have a dual effect on water quality. Under photosynthesis, the dissolved oxygen is improved, the circulation of water body substances is promoted, food sources are provided for zooplankton, and an appropriate amount of food sources can maintain ecological balance, but when the water body is polluted, the environment conditions such as excessive nitrogen and phosphorus, high-temperature strong light and the like promote the explosive proliferation of algae. Therefore, algae are monitored in real time, the current algae condition is mastered in time, and the current fluorescence detection method is the most commonly used method in algae monitoring. There are two methods of using algae detection instruments manufactured based on the fluorescent properties of algae. The method is time-consuming and labor-consuming, and has the risk of drowning. And the other is to put the instrument into the water body of the test point to perform real-time on-line detection and upload data in real time. However, the on-line monitoring instrument has the condition that the detector is immersed in water and is easy to be polluted by algae and microorganism adhesion, and the detector needs to be cleaned frequently. If the cleaning is not in place in time, the detection data is unstable and unreliable. Therefore, both methods cannot meet the current need for daily monitoring of algae. Disclosure of Invention The invention aims to provide a non-contact algae online detection system and a non-contact algae online detection method. In order to achieve the above purpose, the invention adopts the following technical scheme: a non-contact algae online detection system comprises a housing; the measuring cylinder is obliquely arranged in the shell and is provided with a measuring opening which is horizontally arranged; The light source emission assembly is positioned at the upper side of the measuring opening and comprises a light source driving plate, a light source, a reference light detector, a glass sheet and an emission lens, wherein the light source driving plate is electrically connected with the light source, the glass sheet and an emission optical axis of the light source emission assembly are arranged at an included angle of 45 degrees, the reference light detector is arranged at one side of the glass sheet for reflecting light, the emission lens is arranged at one side of the glass sheet for refracting light, and a focus of a light beam of the light source converged through the emission lens is positioned at the lower side of the liquid level of the measuring opening; The fluorescence detection assembly is located the upside of measuring the opening, including receiving circuit board, receiving detector, receiving diaphragm, receiving lens, receiving circuit board with the receiving detector electricity is connected, receiving diaphragm in receiving lens set gradually in receiving detector is close to one side of measuring the opening, the emission optical axis of light source emission assembly with the receiving optical axis of fluorescence detection assembly is perpendicular setting, and the intersection is located measuring the open-ended liquid level downside. Preferably, the light source emission component further comprises an emission diaphragm, an emission quartz glass sheet and an emission heating sheet, wherein the emission diaphragm is arranged between the light source and the glass sheet, the emission quartz glass sheet is arranged on one side of the emission lens, which faces the measurement opening, and the emission heating sheet is fixed with the emission quartz glass sheet. Preferably, the fluorescence detection assembly further comprises an optical filter, a receiving quartz glass sheet and a receiving heating sheet, the optical filter is arranged between the receiving detector and the receiving diaphragm, the receiving quartz glass sheet is arranged on one side of the receiving lens, which faces the measuring opening, and the receiving heating sheet is fixed with the receiving quartz glass sheet. Preferably, the number of the light sources is two, and the light sources are symmetrically arranged on the light source driving plate. Preferably, the measuring cylinder comprises a cylinder body and an overflow cylinder, the upper side surface of the cylinder body is provided with the measuring opening, the overflow cylinder is sleeved outside the cylinder body, and an overflow cavity is formed between the overflow cylinder and the cylinder body in a surrounding mode. Preferably, a non-contact algae online detection method comprises the following steps: S1, performing monitoring point position investigation on a target detection water area, generating p