Ocean carbon sink sensor

Abstract

The utility model relates to an ocean carbon sink sensor which comprises a sensor circuit, and the sensor circuit comprises a photoacoustic sensing module, an induction optical filter module, an LDO chip module, a filter circuit module and a data processing unit. The photoacoustic sensing module detects sound waves generated by a photoacoustic effect, converts the sound waves into electric signals and outputs the electric signals to the data processing unit; the sensing optical filter module detects the concentration of carbon dioxide by utilizing the absorption characteristic of carbon dioxide molecules to infrared rays, converts a spectral signal into an electric signal and outputs the electric signal to the data processing unit; the sensor disclosed by the utility model is based on a photoacoustic effect principle and an infrared absorption spectrum technology, and realizes real-time monitoring on the concentration of carbon dioxide in algae in the ocean in daytime and at night; the assembly and the integration are easy; data acquisition, transmission and processing are realized through the digital monitoring platform, and the monitoring efficiency and accuracy are improved; the method can be widely applied to the fields of marine ecological protection, environmental monitoring and the like, and provides important data support for scientific research and protection.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon sink monitoring, in particular to an ocean carbon sink sensor. Background Art

[0002] Compared with green carbon, blue carbon has the characteristics of great development potential, high carbon fixation efficiency, and lasting carbon fixation effect. 90% of photosynthesis on the earth is completed by marine algae. Seaweed can effectively utilize solar energy, fix carbon dioxide through photosynthesis, dissolve inorganic carbon and convert it into organic carbon, and further reduce the partial pressure of carbon dioxide in the water. Marine carbon sinks play a vital role in absorbing atmospheric carbon dioxide, alleviating global warming, and supporting biodiversity. It is another important path for ecological carbon sinks. However, traditional carbon sink monitoring methods have problems such as insufficient monitoring accuracy, time-consuming and labor-intensive, and high cost. There is an urgent need for a more efficient, accurate and reliable digital monitoring method. Utility Model Content

[0003] The purpose of the utility model is to provide an ocean carbon sink sensor that can monitor carbon storage and carbon flow in an ecosystem in real time, accurately and efficiently, and provide reliable data support for carbon sink measurement and trading.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A marine carbon sink sensor comprises a sensor circuit, wherein the sensor circuit comprises a photoacoustic sensor module, a sensing filter module, an LDO chip module, a filter circuit module and a data processing unit, wherein the LDO module provides a stable operating voltage for the sensor, the photoacoustic sensor module and the sensing filter module are used to measure a carbon dioxide concentration signal and convert the carbon dioxide concentration signal into an electrical signal, the filter circuit filters out interference signals in the electrical signal, the data processing unit converts the input electrical signal into a digital signal, performs data processing based on a calculation model, obtains carbon dioxide concentration data, and can perform data integration with a monitoring platform;

[0006] The photoacoustic sensing module detects the sound waves generated by the pressure change of the carbon dioxide molecules in the sensor cavity after being excited by the infrared light source. The carbon dioxide concentration and the intensity of the sound wave are in a single-valued relationship. The sound wave signal is converted into an electrical signal and output to the data processing unit;

[0007] The sensing filter module includes a dominant sensing plate for detecting the spectrum of the infrared light source after being absorbed by the gas, and a reference sensing plate for detecting the spectrum of the infrared light source not absorbed by the gas. The sensing filter module converts the spectrum signals of the dominant sensing plate and the reference sensing plate into electrical signals, and outputs the electrical signals to the data processing unit;

[0008] The LDO chip module is connected to the entire sensor circuit and is used to adjust the input voltage to the required output voltage;

[0009] The filtering circuit module is a common mode choke or a common mode filter, which filters out mixed high-frequency signals in the signal and amplifies the signal to a suitable size;

[0010] The data processing unit converts the electrical signal output by the photoacoustic sensor module and the electrical signal output by the inductive filter module into carbon dioxide concentration data through data processing, and displays or transmits it to the digital monitoring platform.

[0011] A further solution is that the photoacoustic sensing module includes a circular filter that can tune natural light to the wavelength absorbed by carbon dioxide. After carbon dioxide molecules absorb the filtered light, pressure fluctuations generate sound waves. The photoacoustic sensing module detects the pressure changes generated by carbon dioxide molecules and converts them into electrical signals for output. Its design is as follows:

[0012] When there is sufficient sunlight during the day, a specific carbon dioxide circular filter (25*2mm) is used to tune natural light to the carbon dioxide absorption wavelength (λ=4.2μm) to monitor the carbon dioxide concentration of algae in the ocean. Using the photoacoustic effect, carbon dioxide molecules absorb the filtered light, and the change in the intensity of molecular vibration causes pressure changes, generating sound waves. The acoustic conversion module detects the sound waves generated by the carbon dioxide molecules in the sensor cavity and converts them into electrical signals for output.

[0013] A further solution is that both the dominant sensing sheet and the reference sensing sheet are covered with filter materials; the signal output by the dominant sensing sheet decreases as the measured gas absorbs the infrared spectrum, while the signal level on the reference sensing sheet remains unchanged; the carbon dioxide in the measured gas affects the electrical signal output by the sensing sheet, and its change is proportional to the carbon dioxide concentration. The design is as follows:

[0014] In the dark or when there is insufficient light, in order to provide a light source for measurement, an infrared light source is used to illuminate two circular sensing plates (9.9*2mm), both of which are covered with filter materials. The signal output by the sensing plate changes with the absorption of infrared spectrum by carbon dioxide. One of the sensing plates is designed as a dominant sensing plate to detect the part of the spectrum of the infrared light source that is absorbed by carbon dioxide gas; the other sensing plate is designed as a reference sensing plate to detect the spectrum that is not absorbed by carbon dioxide gas. The signal output by the dominant sensing plate decreases as the measured carbon dioxide gas absorbs the infrared spectrum, while the signal level on the reference sensing plate remains unchanged. The carbon dioxide concentration in the measured gas will affect the electrical signal output by the sensing plate, and its change is proportional to the carbon dioxide concentration.

[0015] A further solution is that in the high-voltage environment of the ocean, the use of a switching regulator may cause electromagnetic interference and noise, which will have an adverse effect on the measurement accuracy. In contrast, the LDO chip module is more widely used in high-voltage environments. The utility model uses a 6203A33M 3.3V LDO chip patch to stably adjust the input voltage to the required output voltage, and can work normally even if the input voltage is slightly lower than the output voltage (low voltage difference). In the circuit of this ocean monitoring sensor, the LDO chip can ensure the stable operation of the sensor circuit and is not affected by power supply voltage fluctuations. Therefore, its main function is to provide a stable power supply to other components, such as sensors, filter amplifiers, etc., to ensure that they can operate normally.

[0016] A further solution is that the useful signal frequency output by the carbon dioxide infrared sensor is very low and the signal amplitude is small, so it needs to be filtered and amplified. The MCZ1210AH201L2TA0G common mode choke / filter is used to filter out the mixed high-frequency signal in the signal and amplify the signal to a suitable size.

[0017] A further solution is that the data processing unit is implemented by a single chip microcomputer, model STM32F373VCH6, and is implemented by algorithm programming; it converts the electrical signals output by the photoacoustic sensor module and the sensing filter module into carbon dioxide concentration data, and realizes data collection, transmission and processing through a digital monitoring platform. The carbon dioxide concentration is calculated based on the electrical signal, and the result is displayed in real time or transmitted to the digital monitoring platform.

[0018] A further solution is that the sensor circuit adopts SMD aluminum alloy package. Aluminum alloy is a lightweight and high-strength material, which is suitable for making lightweight packages. SMD aluminum alloy package can reduce the weight of the overall circuit board, which helps to reduce the load and cost of the equipment. It has good corrosion resistance and wear resistance, can operate stably for a long time under harsh environmental conditions, and improve the reliability and stability of the equipment. At the same time, it is suitable for surface mount technology (SMT), can realize automated production and assembly, and improve production efficiency and production quality. This package is more compact than the traditional plug-in package, can save space on the circuit board, make the circuit board design more flexible, and is suitable for miniaturized and integrated application scenarios.

[0019] The marine carbon sink sensor provided in the above technical solution includes a sensor circuit, which includes a photoacoustic sensor module, a sensing filter module, an LDO chip module, a filter circuit module and a data processing unit; through the connection of each module and the processing of data, the photoacoustic sensor module includes a filter and a sound wave detection unit, which detects the sound waves generated by the photoacoustic effect and converts them into electrical signals to output to the data processing unit; the sensing filter module uses the absorption characteristics of carbon dioxide molecules to infrared rays to detect the concentration of carbon dioxide, including a spectral dominant sensing sheet that detects the infrared light source after being absorbed by carbon dioxide gas and a spectral reference sensing sheet that detects the infrared source not being absorbed by carbon dioxide gas, and converts the spectral signal into an electrical signal to output to the data processing unit; the sensor is based on the principle of photoacoustic effect and infrared absorption spectroscopy technology to realize real-time monitoring of the carbon dioxide concentration of algae in the ocean under day and night conditions; it adopts components such as LDO chip module and low-pass filter module, which is easy to assemble and integrate; the marine carbon sink sensor of the utility model has the following beneficial effects:

[0020] (1) Use natural light, no additional light source equipment is required, saving energy and cost;

[0021] (2) The accuracy and sensitivity of monitoring are improved by tuning the filter to the carbon dioxide absorption wavelength;

[0022] (3) Using the principle of photoacoustic effect, efficient monitoring of carbon dioxide concentration in algae in the ocean is achieved;

[0023] (4) Real-time data collection, transmission and processing are achieved through the digital monitoring platform, which improves monitoring efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a design principle diagram of the ocean carbon sink sensor described in the utility model;

[0025] Figure 2 The working principle of S1 and S2 sensors under infrared light source;

[0026] Figure 3 A schematic diagram of the system topology. DETAILED DESCRIPTION

[0027] In order to make the purpose and advantages of the utility model more clear, the utility model is specifically described in combination with the following embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the utility model, and does not strictly limit the protection scope of the specific request of the utility model.

[0028] The technical solution adopted by the utility model is as follows Figure 1As shown, an ocean carbon sink sensor includes a sensor circuit, which includes a photoacoustic sensor module, a sensing filter module, an LDO chip module, a filter circuit module and a data processing unit; the photoacoustic sensor module detects the sound waves generated by the pressure change of carbon dioxide molecules in the sensor cavity, and converts them into electrical signals and outputs them to the data processing unit;

[0029] like Figure 2 As shown, the inductive filter module includes a dominant inductive plate for detecting the spectrum absorbed by carbon dioxide gas in the infrared light source, and a reference inductive plate for detecting the spectrum not absorbed by carbon dioxide gas. The inductive filter module converts the signals of the dominant inductive plate and the reference inductive plate into electrical signals, and outputs the electrical signals to the data processing unit; the dominant inductive plate and the reference inductive plate are both covered with filter materials; the signal output by the dominant inductive plate decreases as the measured gas absorbs the infrared spectrum, while the signal level on the reference inductive plate remains unchanged; the carbon dioxide in the measured gas affects the electrical signal output by the inductive plate, and its change is proportional to the carbon dioxide concentration. Its design is as follows:

[0030] In the dark or when there is insufficient light, in order to provide a light source for measurement, an infrared light source is used to illuminate two circular sensing plates (9.9*2mm), both of which are covered with filter materials. The signal output by the sensing plate changes as carbon dioxide absorbs the infrared spectrum. One of the sensing plates is designed as a dominant sensing plate to detect the spectral signal of the infrared light source that is absorbed by carbon dioxide gas; the other sensing plate is designed as a reference sensing plate to detect the spectral signal of the infrared light source that is not absorbed by the gas. The signal output by the dominant sensing plate decreases as the measured gas absorbs the infrared spectrum, while the signal level on the reference sensing plate remains unchanged. The carbon dioxide concentration in the measured gas will affect the electrical signal output by the sensing plate, and its change is proportional to the carbon dioxide concentration.

[0031] like Figure 3 As shown, the photoacoustic sensor module and the inductive filter module are used to measure the carbon dioxide concentration signal and convert the carbon dioxide concentration signal into an electrical signal; the LDO chip module is connected to the entire sensor circuit and is used to adjust the input voltage to the required output voltage; the filter circuit module is a common mode choke or a common mode filter, which filters out the mixed high-frequency signal in the signal and amplifies the signal to a suitable size; the data processing unit converts the electrical signal output by the photoacoustic sensor module and the electrical signal output by the inductive filter module into carbon dioxide concentration data, and displays or transmits it to the digital monitoring platform.

[0032] Example 1

[0033] Marine Algae CO2 Monitoring:

[0034] Scenario description: In the marine environment, the photoacoustic sensor module and the inductive filter module are designed to monitor the changes in carbon dioxide concentration produced by algae in the ocean in real time through the photoacoustic effect and infrared absorption spectroscopy technology.

[0035] Implementation plan: Deploy sensors in the marine biosphere and use natural light sources and infrared light sources for monitoring. During the day, the photoacoustic sensing module uses a specific filter to tune the light signal to the wavelength absorbed by carbon dioxide to detect the concentration of carbon dioxide; at night or when there is insufficient light, the infrared light source shines on the sensing filter, and the signal output by the sensing piece changes with the infrared spectrum absorbed by carbon dioxide, thereby measuring the concentration of carbon dioxide.

[0036] Example 2

[0037] Deployment of marine environment monitoring stations:

[0038] Scenario description: Establish a monitoring station in the marine environment to monitor parameters such as carbon dioxide concentration, temperature, and pH value in seawater for scientific research, environmental protection, and other purposes.

[0039] Implementation plan: Deploy ocean monitoring sensors on buoys, ships or submarine equipment, and protect circuit boards from seawater corrosion through SMD aluminum alloy packaging. Use photoacoustic sensing modules and inductive filter modules to monitor carbon dioxide concentration in real time, LDO chips provide stable power, filter circuit modules process signals, and data processing units upload monitoring data to monitoring stations or cloud platforms to achieve remote monitoring and management of the marine environment.

[0040] Example 3

[0041] Marine ecological protection projects:

[0042] Scenario description: In the marine ecological protection project, monitor the changes in carbon dioxide concentration in the marine biosphere and assess the health of the marine ecosystem.

[0043] Implementation plan: Install ocean monitoring sensors in key areas of the marine biosphere, such as coral reefs and seagrass beds, and use photoacoustic sensing modules and inductive filter modules to monitor changes in carbon dioxide concentration in real time. Analyze monitoring data through data processing units to evaluate the stability and sustainability of marine ecosystems, and provide scientific basis and decision-making support for marine ecological protection projects.

[0044] The above describes in detail the implementation modes of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes. For ordinary technicians in this technical field, after knowing the contents recorded in the present invention, they can make several equivalent changes and substitutions thereto without departing from the principle of the present invention. These equivalent changes and substitutions should also be regarded as belonging to the protection scope of the present invention.

Claims

1. An ocean carbon sink sensor, comprising a sensor circuit, characterized in that: The sensor circuit includes a photoacoustic sensor module, a sensing filter module, an LDO chip module, a filter circuit module and a data processing unit; The photoacoustic sensing module detects the acoustic wave signal generated by the pressure change of the carbon dioxide molecules in the sensor cavity after being excited by infrared light. The carbon dioxide concentration and the signal intensity of the acoustic wave signal are in a single-value relationship. The acoustic wave signal is converted into an electrical signal and output to the data processing unit; The sensing filter module includes a dominant sensing sheet for detecting the spectrum absorbed by carbon dioxide gas in the infrared light source, and a reference sensing sheet for detecting the spectrum not absorbed by carbon dioxide gas. The sensing filter module converts the spectrum signals of the dominant sensing sheet and the reference sensing sheet into electrical signals, and outputs the electrical signals to the data processing unit; The LDO chip module is connected to the entire sensor circuit and is used to adjust the input voltage to the required output voltage; The filtering circuit module is a common mode choke or a common mode filter, which filters out mixed high-frequency signals in the signal and amplifies the signal to a suitable size; The data processing unit converts the electrical signal output by the photoacoustic sensor module and the electrical signal output by the inductive filter module into carbon dioxide concentration data through data processing, and displays or transmits the data to the digital monitoring platform.

2. The marine carbon sink sensor according to claim 1, characterized in that: The photoacoustic sensing module includes a circular filter that can tune natural light to the wavelength absorbed by carbon dioxide. Carbon dioxide molecules absorb the filtered light and generate sound waves caused by pressure changes. The sound wave detection unit detects the sound wave changes generated by the carbon dioxide molecules and converts them into electrical signals for output.

3. The marine carbon sink sensor according to claim 1, characterized in that: The dominant sensing sheet and the reference sensing sheet are both covered with filter materials; the signal output by the dominant sensing sheet decreases as the measured gas absorbs the infrared spectrum, while the signal level on the reference sensing sheet remains unchanged; the carbon dioxide concentration in the measured gas affects the electrical signal output by the sensing sheet, and its change is proportional to the carbon dioxide concentration.

4. The marine carbon sink sensor according to claim 1, characterized in that: The LDO chip module is a 6203A33M3.3V LDO chip patch.

5. The marine carbon sink sensor according to claim 1, characterized in that: The filtering circuit module is a MCZ1210AH201L2TA0G common mode choke / filter, which filters out mixed high-frequency signals in the signal and amplifies the signal to a preset size.

6. The marine carbon sink sensor according to claim 1, characterized in that: The sensor circuit is packaged in SMD aluminum alloy.

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