CN117110229A - Carbon dioxide concentration measuring method - Google Patents
Carbon dioxide concentration measuring method Download PDFInfo
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- CN117110229A CN117110229A CN202310895282.5A CN202310895282A CN117110229A CN 117110229 A CN117110229 A CN 117110229A CN 202310895282 A CN202310895282 A CN 202310895282A CN 117110229 A CN117110229 A CN 117110229A
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- carbon dioxide
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- dioxide concentration
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- infrared light
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 51
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 26
- 238000011088 calibration curve Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 238000013508 migration Methods 0.000 abstract description 7
- 230000005012 migration Effects 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 7
- 230000031700 light absorption Effects 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a carbon dioxide concentration measuring method, and provides a carbon dioxide concentration measuring method based on infrared light absorption aiming at the requirement of indoor air quality monitoring. Conventional chemical sensors and ion migration methods suffer from drawbacks such as short lifetime, instability, and high cost. Through adopting infrared light source and sensor, this scheme can realize high accuracy, stable carbon dioxide concentration measurement to possess real-time supervision ability. The measurement result is accurate and reliable through calibration and a data processing algorithm. The invention has the advantages of long service life, low maintenance cost and wide applicability, and can be flexibly customized to meet the requirements of different application scenes. The technical scheme provides a reliable, accurate and real-time solution for measuring the concentration of carbon dioxide for monitoring the indoor air quality.
Description
Technical Field
The invention relates to a method for measuring carbon dioxide concentration.
Background
In the field of indoor air quality monitoring, common carbon dioxide concentration measurement methods include infrared light absorption, chemical sensors, ion migration and the like. However, these methods have some drawbacks, as follows:
1. defects of chemical sensors: short life and instability: some chemical sensors require frequent replacement and calibration and are susceptible to environmental conditions, resulting in instability of the measurement results. Infectivity and cross-talk: some chemical sensors are sensitive to cross-interference by other gases, resulting in deviations in measurement results and possible contamination. Not suitable for real-time monitoring: chemical sensors typically respond slowly and real-time monitoring is difficult to achieve.
2. Defects of ion migration method: complicated operations and maintenance: the ion migration method requires complicated equipment and a high-precision measurement system, and has high operation and maintenance requirements. Expensive cost: ion migration methods involve high cost ion migration equipment, which can be too expensive for general applications. Unsuitable for mobile applications: ion migration methods generally require a stable power supply and a large space, and are not suitable for mobile applications or portable devices.
Disclosure of Invention
The invention aims to provide a carbon dioxide concentration measuring method.
In order to achieve the above purpose, the invention is implemented according to the following technical scheme:
the invention comprises the following steps:
s1: determining a carbon dioxide concentration range to be measured and a required measurement accuracy;
s2: selecting a proper infrared light source and a proper sensor according to measurement requirements;
s3: the infrared light source and sensor are combined in a suitable measuring system;
s4: using a carbon dioxide sample with known concentration to calibrate a sensor, placing the sensor in carbon dioxide environments with different concentrations, recording corresponding sensor output data, and establishing a calibration curve or equation between the sensor output and the carbon dioxide concentration according to the data;
s5: placing a sample to be measured in a measurement system, enabling infrared light to pass through the sample, and enabling a sensor to detect the intensity change of the light passing through the sample, wherein the intensity change of the light is used for converting the light into a corresponding carbon dioxide concentration value;
s6: the sensor output signal is processed and interpreted using a signal processor, converted to a carbon dioxide concentration value according to a previous calibration curve or equation, and the measurement is displayed on a display or recorded in a computer or recorder.
The measuring system consists of a sample chamber, a signal processor and a control system, wherein the sample chamber is a space made of transparent materials, and the signal processor amplifies, filters and processes signals output by the sensor; the control system is used for controlling the infrared light source and the signal processor, the air to be detected is stored in the sample chamber, the infrared light source and the sensor are respectively positioned at two sides of the sample chamber, and the signal output end of the signal processor is connected with the display, the computer or the recorder.
In the step S6, a linear relationship is established between the sensor output signal and the carbon dioxide sample with a known concentration, and then, a corresponding carbon dioxide concentration value is calculated by using a linear interpolation or fitting method according to the signal output by the sensor during measurement.
The beneficial effects of the invention are as follows:
compared with the prior art, the invention has the following technical effects:
1. high precision and stability: the infrared light absorption method has high selectivity to carbon dioxide and can provide accurate and stable measurement results.
2. Real-time monitoring capability: the infrared light absorption method has high response speed, can realize real-time monitoring of the carbon dioxide concentration, and provides timely data feedback.
3. Long life and low maintenance cost: the infrared light absorbing method sensor has a longer lifetime and lower maintenance requirements than chemical sensors, reducing the frequency of replacement and calibration.
4. Reliability and accuracy: through calibration and data processing algorithms, the infrared light absorption method can provide accurate carbon dioxide concentration measurements.
5. The applicability is wide: the infrared light absorption-based measurement method can be suitable for various application scenes, such as indoor air quality monitoring, industrial emission control and the like.
6. Flexibility and customizable: the method can be customized and optimized according to specific requirements so as to adapt to different environments and application requirements.
By the technical scheme, the method can overcome some defects of the traditional method and provide more reliable, accurate and real-time carbon dioxide concentration measuring capability.
Detailed Description
The invention is further described below in the following description of specific embodiments, which are presented for purposes of illustration and description, but are not intended to be limiting.
The invention comprises the following steps:
s1: determining a carbon dioxide concentration range to be measured and a required measurement accuracy;
s2: selecting a proper infrared light source and a proper sensor according to measurement requirements;
s3: the infrared light source and sensor are combined in a suitable measuring system;
s4: using a carbon dioxide sample with known concentration to calibrate a sensor, placing the sensor in carbon dioxide environments with different concentrations, recording corresponding sensor output data, and establishing a calibration curve or equation between the sensor output and the carbon dioxide concentration according to the data;
s5: placing a sample to be measured in a measurement system, enabling infrared light to pass through the sample, and enabling a sensor to detect the intensity change of the light passing through the sample, wherein the intensity change of the light is used for converting the light into a corresponding carbon dioxide concentration value;
s6: the sensor output signal is processed and interpreted using a signal processor, converted to a carbon dioxide concentration value according to a previous calibration curve or equation, and the measurement is displayed on a display or recorded in a computer or recorder.
The measuring system consists of a sample chamber, a signal processor and a control system, wherein the sample chamber is a space made of transparent materials, and the signal processor amplifies, filters and processes signals output by the sensor; the control system is used for controlling the infrared light source and the signal processor, the air to be detected is stored in the sample chamber, the infrared light source and the sensor are respectively positioned at two sides of the sample chamber, and the signal output end of the signal processor is connected with the display, the computer or the recorder.
In the step S6, a linear relationship is established between the sensor output signal and the carbon dioxide sample with a known concentration, and then, a corresponding carbon dioxide concentration value is calculated by using a linear interpolation or fitting method according to the signal output by the sensor during measurement.
Examples:
a carbon dioxide concentration measuring system is designed for monitoring the indoor air quality of an office. The following components and settings were selected:
and (3) an infrared light source: an infrared diode with a wavelength of 4.26 microns was chosen as the light source.
An infrared light sensor: an infrared photodiode having high sensitivity and quick response is used as a sensor.
Sample chamber design: a small sample cell is designed, using a transparent organic glass material, to hold an air sample and to ensure light transmission.
Signal processing and control system: the sensor output signal is amplified and filtered by an amplifier, and a microprocessor is adopted as the core of a signal processor and a control system.
Calibration and algorithm: sensor calibration is performed using a known concentration of carbon dioxide sample, establishing a linear relationship between carbon dioxide concentration and sensor output signal.
Results display and communication: and the liquid crystal display screen is used for displaying the measurement result in real time, and the system and the network module are connected, so that the measurement result can be accessed remotely.
Reference experimental data:
three samples of carbon dioxide of known concentration were used for the measurement and the sensor output signal and corresponding concentration values were recorded. The following are experimental data:
carbon dioxide sample 1: sensor output signal = 2.14V, concentration = 400ppm
Carbon dioxide sample 2: sensor output signal = 2.73V, concentration = 800ppm
Carbon dioxide sample 3: sensor output signal = 3.31V, concentration = 1200ppm
A simple linear relation equation is established according to the data, and the sensor output signal is converted into a carbon dioxide concentration value. In this example, it is assumed that the linear relationship is CO2 concentration=a×sensor output signal+b.
By linear fitting calculation, the following referenced relational equation is obtained:
CO2 concentration = 324.22 x sensor output signal-51.59
Using this equation, when measured, a corresponding carbon dioxide concentration value can be calculated from the sensor output signal.
In practical applications, specific calculations and adjustments are required based on the characteristics of the actual sensor and calibration data. Meanwhile, more experiments and data acquisition are helpful for improving the accuracy and reliability of the measurement result.
The technical scheme of the invention is not limited to the specific embodiment, and all technical modifications made according to the technical scheme of the invention fall within the protection scope of the invention.
Claims (3)
1. A method for measuring carbon dioxide concentration, comprising the steps of:
s1: determining a carbon dioxide concentration range to be measured and a required measurement accuracy;
s2: selecting a proper infrared light source and a proper sensor according to measurement requirements;
s3: the infrared light source and sensor are combined in a suitable measuring system;
s4: using a carbon dioxide sample with known concentration to calibrate a sensor, placing the sensor in carbon dioxide environments with different concentrations, recording corresponding sensor output data, and establishing a calibration curve or equation between the sensor output and the carbon dioxide concentration according to the data;
s5: placing a sample to be measured in a measurement system, enabling infrared light to pass through the sample, and enabling a sensor to detect the intensity change of the light passing through the sample, wherein the intensity change of the light is used for converting the light into a corresponding carbon dioxide concentration value;
s6: the sensor output signal is processed and interpreted using a signal processor, converted to a carbon dioxide concentration value according to a previous calibration curve or equation, and the measurement is displayed on a display or recorded in a computer or recorder.
2. The carbon dioxide concentration measuring method according to claim 1, characterized in that: the measuring system consists of a sample chamber, a signal processor and a control system, wherein the sample chamber is a space made of transparent materials, and the signal processor amplifies, filters and processes signals output by the sensor; the control system is used for controlling the infrared light source and the signal processor, the air to be detected is stored in the sample chamber, the infrared light source and the sensor are respectively positioned at two sides of the sample chamber, and the signal output end of the signal processor is connected with the display, the computer or the recorder.
3. The carbon dioxide concentration measuring method according to claim 1, characterized in that: in the step S6, a linear relationship is established between the sensor output signal and the carbon dioxide sample with a known concentration, and then, a corresponding carbon dioxide concentration value is calculated by using a linear interpolation or fitting method according to the signal output by the sensor during measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310895282.5A CN117110229A (en) | 2023-07-20 | 2023-07-20 | Carbon dioxide concentration measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310895282.5A CN117110229A (en) | 2023-07-20 | 2023-07-20 | Carbon dioxide concentration measuring method |
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| Publication Number | Publication Date |
|---|---|
| CN117110229A true CN117110229A (en) | 2023-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310895282.5A Pending CN117110229A (en) | 2023-07-20 | 2023-07-20 | Carbon dioxide concentration measuring method |
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| Country | Link |
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| CN (1) | CN117110229A (en) |
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2023
- 2023-07-20 CN CN202310895282.5A patent/CN117110229A/en active Pending
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