CN103760136A - Online monitoring system of greenhouse gas and stable isotope thereof - Google Patents
Online monitoring system of greenhouse gas and stable isotope thereof Download PDFInfo
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- CN103760136A CN103760136A CN201410027323.XA CN201410027323A CN103760136A CN 103760136 A CN103760136 A CN 103760136A CN 201410027323 A CN201410027323 A CN 201410027323A CN 103760136 A CN103760136 A CN 103760136A
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Abstract
The invention relates to an online monitoring system of a greenhouse gas and a stable isotope of the greenhouse gas. The online monitoring system comprises a measurement module and a data acquisition and control module. The online monitoring system is characterized by further comprising an automatic sample feeding module and a power device, wherein an outlet of the automatic sample feeding module is connected with an inlet of the measurement module, the power device is connected with an outlet of the measurement module to provide power to the sampling, and the output end of the data acquisition and control module is connected with the automatic sample feeding module, the measurement module and the power device and the data acquisition and control module controls all the modules to cooperatively and synchronously work. The online monitoring system has the beneficial effects that the automatic sample feeding module and the power device continuously suck air to an optical attenuation cavity for performing automatic and continuous measurement, a tunable laser generates light with a plurality of specific wavelengths, multiple components can be measured; the wavelength resolution can reach 0.0001 cm<-1>, the anti-interference capacity is strong; and by adopting an optical cavity attenuation detection technology, a gas concentration is in direct proportion to an attenuation time, the influence by light source fluctuation and a light intensity attenuation factor is small, the stability is good, and the measurement value is accurate.
Description
Technical field
The present invention relates to gas and detect and technical field of automatic control, especially a kind of greenhouse gases and stable isotope on-line monitoring system thereof.
Background technology
Greenhouse gases refer to the gas componant that can produce greenhouse effect in atmosphere.6 kinds of main greenhouse gas of < < Kyoto Protocol > > regulation limit row are CO
2, CH
4, N
2o, HFCs, PFCs and SF
6, its spatial and temporal distributions and change in the radiation budget of ground vapour system and energy equilibrium and play decisive role.Greenhouse is the basis of formation, character and the intensity etc. of research greenhouse gas concentration variation tendency and source and remittance, is also the important topic of atmospheric environment science, significant to greenhouse gases distribution assessment and reply climate change.
Stable isotope refers to isotope highly stable and that do not decay,
2h,
13c,
17o,
18o etc. are stable isotopes common in the ecosystem.In different emission sources, the content of stable isotope is different, represents with the isotopic ratio of sample with respect to thousand points of poor δ of standard substance isotopic ratio.To with
13c, the δ of the atmospheric background, C3 plant, C4 and phytolite fuel is respectively: approximately-8, approximately-25 to-28, approximately-12 to-15, approximately-24 to-44.By monitoring greenhouse gases stable isotope concentration and variation tendency thereof, can identify atmosphere greenhouse gases source, assess the contribution of different pollution source to greenhouse gas emission, for Global Carbon, change with Carbon balance research significant.
Existing Greenhouse technology mainly comprises Ftir Spectroscopy, non-dispersion infrared absorption spectroscopy techniques and tunable diode laser absorption spectroscopy technology etc., and no matter they are the demands of trace Greenhouse in the aspects such as sensitivity, minimum detectability, long-time stability all can not meet atmosphere; Simultaneously, current isotope monitoring technology mainly adopts the Stable isotope ratio mass spectrometer of use for laboratory, bulky, running program complexity, can not meet the demand of tubularpH sensor, and need to dewater to gas, the multiple operation such as organic matter removal, otherwise can cause the relatively large deviation of measurement result.
Summary of the invention
The object of this invention is to provide a kind of can measure simultaneously multiple trace gas, simple in structure, measure greenhouse gases and stable isotope on-line monitoring system thereof accurately.
In order to complete above-mentioned purpose, the technical solution used in the present invention is:
A kind of greenhouse gases and stable isotope on-line monitoring system thereof, comprise measurement module and data acquisition and control module, also comprise auto injection module and propulsion system, the outlet of described auto injection module connects the entrance of measurement module, described propulsion system are connected with the outlet of measurement module for its sampling provides power, and described data acquisition is connected with auto injection module, measurement module and propulsion system with the output terminal of control module and controls the work of modules coordinate synchronization.
Described auto injection module comprises coarse filter, solenoid valve group and fine filtrator, described solenoid valve group is connected with control module with data acquisition, the opening and closing of data acquisition and control module control solenoid valve group, coarse filter and fine filtrator are assemblied in respectively the entrance and exit place of solenoid valve group, and the outlet of fine filtrator is connected with the entrance of measurement module.
Described solenoid valve group is comprised of multiple solenoid valves, and the entrance of solenoid valve is corresponding one by one with coarse filter.
The order number of the screen pack of described coarse filter is less than the order number of the screen pack of fine filtrator, described coarse filter is greater than the filtration efficiency > 95% of the particle of 0.3 μ m to particle diameter, described fine filtrator is greater than the filtration efficiency > 99.5% of the particle of 0.1 μ m to particle diameter.
Described measurement module comprises tunable laser, Wavelength monitor, optics declines and swings chamber, photodetector, laser control module and temperature and pressure control module, the output terminal of tunable laser is connected with the input end of Wavelength monitor, the output terminal of Wavelength monitor and the optics optics entrance that swings chamber that declines is connected with the input end of laser control module, the output terminal of laser control module is connected with the input end of tunable laser, the optics optics outlet of swinging chamber that declines is connected with the input end of photodetector, the output terminal of photodetector is connected with the input end of control module with data acquisition, temperature and pressure control module and optics decline and swing chamber and be connected and control optics and decline and swing the temperature and pressure in chamber.
Described temperature and pressure control module control optics declines and swings the temperature and pressure in chamber, temperature control precision < ± 0.005 ℃, pressure controling precision < ± 0.02kPa.
Described optics declines and swings chamber and comprise cavity, incident lens, catoptron, exit lens, temperature sensor and pressure transducer, incident lens, catoptron and exit lens are arranged on inside cavity, temperature sensor and pressure transducer are arranged on chamber outer wall and with inside cavity and are communicated with, and temperature sensor is connected with temperature and pressure control module with pressure transducer.
Described incident lens and exit lens are high mirror lens, and described catoptron is spherical reflector, and described incident lens, catoptron and exit lens is isosceles triangle arranges, incident lens and exit lens are arranged symmetrically in the both sides of catoptron.
The wavelength coverage of the laser that described tunable laser produces is 1510-1640nm.
The invention has the beneficial effects as follows: due to auto injection module and propulsion system continuously extracting air to optics, decline to swing in chamber and carry out Automatic continuous measurement, tunable laser produces the light of multiple wavelength of specific wavelength, can measure various ingredients simultaneously; Wavelength resolution can arrive 0.0001cm
-1, antijamming capability is strong; Adopt optical cavity ring-down detection technique, gas concentration is directly proportional to ring-down time, affected by the factors such as light source fluctuation, light intensity attenuation little, and long-time stability are good and measurement numerical value is more accurate.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Fig. 2 is the structural representation block diagram of auto injection module in figure.
Fig. 3 is that in Fig. 1, optics declines and swings the structural representation in chamber.
In figure, 1, auto injection module, 2, measurement module, 3, propulsion system, 4, data acquisition and control module, 5, optics declines and swing chamber, 6, tunable laser, 7, Wavelength monitor, 8, laser control module, 9, photodetector, 10, temperature and pressure control module, 11, coarse filter, 12, solenoid valve, 13, fine filtrator, 14, cavity, 15, incident lens, 16, exit lens, 17, catoptron, 18, temperature sensor, 19, pressure transducer.
Embodiment
The present invention is a kind of greenhouse gases and stable isotope on-line monitoring system thereof, due to auto injection module and propulsion system continuously extracting air to optics, decline to swing and in chamber, carry out Automatic continuous measurement, tunable laser produces the light of multiple wavelength of specific wavelength, can measure various ingredients simultaneously; Wavelength resolution can arrive 0.0001cm
-1, antijamming capability is strong; Adopt optical cavity ring-down detection technique, gas concentration is directly proportional to ring-down time, affected by the factors such as light source fluctuation, light intensity attenuation little, and long-time stability are good and measurement numerical value is more accurate.
Below in conjunction with accompanying drawing, the present invention will be further described.
Specific embodiment, as shown in Figure 1 to Figure 3, a kind of greenhouse gases and stable isotope on-line monitoring system thereof, comprise measurement module 2 and data acquisition and control module 4, also comprise auto injection module 1 and propulsion system 3, the outlet of described auto injection module 1 connects the entrance of measurement module 2, described propulsion system 3 are connected with the outlet of measurement module 2 for its sampling provides power, and described data acquisition is connected with auto injection module 1, measurement module 2 and propulsion system 3 with the output terminal of control module 4 and controls the work of modules coordinate synchronization.
Described auto injection module 1 comprises coarse filter 11, solenoid valve group and fine filtrator 13, described solenoid valve group is connected with control module 4 with data acquisition, data acquisition and control module 4 are controlled opening and closing of solenoid valve group, coarse filter 11 and fine filtrator 13 are assemblied in respectively the entrance and exit place of solenoid valve group, and the outlet of fine filtrator 13 is connected with the entrance of measurement module 2.Solenoid valve group is comprised of multiple solenoid valves 12, and by the different changeable sample air-flow of solenoid valve 12 road of switch, the entrance of solenoid valve 12 is corresponding one by one with coarse filter 11.The order number of the screen pack of coarse filter 11 is less than the order number of the screen pack of fine filtrator 13, coarse filter 11 is greater than the filtration efficiency > 95% of the particle of 0.3 μ m to particle diameter, fine filtrator 13 is greater than the filtration efficiency > 99.5% of the particle of 0.1 μ m to particle diameter, assurance enters the gas of measurement module 2 and avoids Particulate Pollution.
Described measurement module 2 comprises tunable laser 6, Wavelength monitor 7, optics declines and swings chamber 5, photodetector 9, laser control module 8 and temperature and pressure control module 10, the output terminal of tunable laser 6 is connected with the input end of Wavelength monitor 7, the wavelength coverage of the laser that tunable laser 6 produces is 1510-1640nm, the output terminal of Wavelength monitor 7 and the optics optics entrance that swings chamber 5 that declines is connected with the input end of laser control module 8, the output terminal of laser control module 8 is connected with the input end of tunable laser 6, the optics optics outlet of swinging chamber 5 that declines is connected with the input end of photodetector 9, the output terminal of photodetector 9 is connected with the input end of control module 4 with data acquisition, temperature and pressure control module 10 and optics decline and swing chamber 5 and be connected and control optics and decline and swing the temperature and pressure in chamber 5.
Described optics declines and swings chamber 5 and comprise cavity 14, incident lens 15, catoptron 17, exit lens 16, temperature sensor 18 and pressure transducer 19, incident lens 15, catoptron 17 and exit lens 16 are arranged on cavity 14 inside, temperature sensor 18 and pressure transducer 19 be arranged on cavity 14 outer walls and with cavity 14 internal communication, temperature sensor 18 is connected with temperature and pressure control module 10 with pressure transducer 19.
Described incident lens 15 and exit lens 16 are high mirror lens, described catoptron 17 is spherical reflector, described incident lens 15, catoptron 17 and exit lens 16 is isosceles triangle arranges, incident lens 15 and exit lens 16 are arranged symmetrically in the both sides of catoptron 17.
The course of work of the present invention is: sample gas is after the coarse filter 11 and fine filtrator 13 two-stage filtrations of auto injection module 1, and clean air enters measurement module 2; Sampling power is provided by propulsion system 3, by the changeable sample air-flow of solenoid valve group road, realizes the measurement of different sources of the gas (as gas, zero gas or air) and different location gas.Under the control of laser control module 8, tunable laser 6 scans in the wavelength coverage of 1510-1640nm, and its part emergent light enters its wavelength of Wavelength monitor 7 monitoring, and another part enters optics and declines and swing chamber 5.Wavelength monitor 7 feeds back to laser control module 8 by testing result, and laser control module 8, according to the length scanning of feedback result control tunable laser 6, has so just realized the closed-loop control of optical maser wavelength, guarantees the accuracy of system laser wavelength measurement.Enter the optics laser that swings chamber 5 that declines and first see through incident lens 15, and arrive exit lens 16; Exit lens 16 is high mirror lens, from the laser of incident lens 15, sub-fraction sees through exit lens 16, arrives photodetector 9, major part is reflected on exit lens 16 surfaces, reflected light is reflected by spherical reflector catoptron 17 again, and arrives incident lens 15, on incident lens 15, is again reflected, enter exit lens 16, so reflection projection, goes round and begins again, until light all disappears.Photodetector 9 detects to such an extent that signal is the light signal of decaying in time, optics declines and swings when chamber 5 is interior misfits without absorption absorbing wavelength gas or sharp light wavelength and gas, affected by reflection, the projection coefficient of incident lens 15, exit lens 16 and catoptron 17, is fixed constant; Optics decline swing in chamber 5, have absorb gas or sharp light wavelength while equating with the absorbing wavelength that absorbs gas, shortening die-away time, and being directly proportional to gas concentration die-away time, just can record the concentration of object gas in this way.Optics declines to swing on the outer wall in chamber 5 temperature sensor 18 and pressure transducer 19 is housed, and by measurement feedback to temperature and pressure control module 10, temperature and pressure control module 10 declines optics to swing temperature and pressure control in chamber 5 within the specific limits, under normal running (operation) conditions, for guaranteeing < ± 0.005 ℃ of temperature control precision accurately and reliably of measurement result, pressure controling precision < ± 0.02kPa, data acquisition and control module 4 are controlled operation, data acquisition, the concentration of whole system and are calculated and result output.Due to auto injection module and propulsion system continuously extracting air to optics, decline to swing in chamber and carry out Automatic continuous measurement, tunable laser produces the light of multiple wavelength of specific wavelength, can measure various ingredients simultaneously; Wavelength resolution can arrive 0.0001cm
-1, antijamming capability is strong; Adopt optical cavity ring-down detection technique, gas concentration is directly proportional to ring-down time, affected by the factors such as light source fluctuation, light intensity attenuation little, and long-time stability are good and measurement numerical value is more accurate.
Claims (9)
1. greenhouse gases and stable isotope on-line monitoring system thereof, comprise measurement module (2) and data acquisition and control module (4), it is characterized in that: also comprise auto injection module (1) and propulsion system (3), the outlet of described auto injection module (1) connects the entrance of measurement module (2), described propulsion system (3) are connected with the outlet of measurement module (2) provides power for its sampling, the output terminal of described data acquisition and control module (4) and auto injection module (1), measurement module (2) is connected with propulsion system (3) and controls the work of modules coordinate synchronization.
2. a kind of greenhouse gases according to claim 1 and stable isotope on-line monitoring system thereof, it is characterized in that: described auto injection module (1) comprises coarse filter (11), solenoid valve group and fine filtrator (13), described solenoid valve group is connected with control module (4) with data acquisition, data acquisition and control module (4) are controlled opening and closing of solenoid valve group, coarse filter (11) and fine filtrator (13) are assemblied in respectively the entrance and exit place of solenoid valve group, the outlet of fine filtrator (13) is connected with the entrance of measurement module (2).
3. a kind of greenhouse gases according to claim 2 and stable isotope on-line monitoring system thereof, is characterized in that: described solenoid valve group is comprised of multiple solenoid valves (12), and the entrance of solenoid valve (12) is corresponding one by one with coarse filter (11).
4. a kind of greenhouse gases according to claim 2 and stable isotope on-line monitoring system thereof, it is characterized in that: the order number of the screen pack of described coarse filter (11) is less than the order number of the screen pack of fine filtrator (13), described coarse filter (11) is greater than the filtration efficiency > 95% of the particle of 0.3 μ m to particle diameter, described fine filtrator (13) is greater than the filtration efficiency > 99.5% of the particle of 0.1 μ m to particle diameter.
5. a kind of greenhouse gases according to claim 1 and stable isotope on-line monitoring system thereof, it is characterized in that: described measurement module (2) comprises tunable laser (6), Wavelength monitor (7), optics declines and swings chamber (5), photodetector (9), laser control module (8) and temperature and pressure control module (10), the output terminal of tunable laser (6) is connected with the input end of Wavelength monitor (7), the output terminal of Wavelength monitor (7) and the optics optics entrance that swings chamber (5) that declines is connected with the input end of laser control module (8), the output terminal of laser control module (8) is connected with the input end of tunable laser (6), the optics optics outlet of swinging chamber (5) that declines is connected with the input end of photodetector (9), the output terminal of photodetector (9) is connected with the input end of control module (4) with data acquisition, temperature and pressure control module (10) and optics decline and swing chamber (5) and be connected and control optics and decline and swing the temperature and pressure of chamber (5).
6. a kind of greenhouse gases according to claim 5 and stable isotope on-line monitoring system thereof, it is characterized in that: described temperature and pressure control module (10) control optics declines and swings the temperature and pressure in chamber (5), temperature control precision < ± 0.005 ℃, pressure controling precision < ± 0.02kPa.
7. a kind of greenhouse gases according to claim 5 and stable isotope on-line monitoring system thereof, it is characterized in that: described optics declines and swings chamber (5) and comprise cavity (14), incident lens (15), catoptron (17), exit lens (16), temperature sensor (18) and pressure transducer (19), incident lens (15), catoptron (17) and exit lens (16) are arranged on cavity (14) inside, temperature sensor (18) and pressure transducer (19) be arranged on cavity (14) outer wall and with cavity (14) internal communication, temperature sensor (18) is connected with temperature and pressure control module (10) with pressure transducer (19).
8. a kind of greenhouse gases according to claim 7 and stable isotope on-line monitoring system thereof, it is characterized in that: described incident lens (15) and exit lens (16) are high mirror lens, described catoptron (17) is spherical reflector, described incident lens (15), catoptron (17) and exit lens (16) is isosceles triangle arranges, incident lens (15) and exit lens (16) are arranged symmetrically in the both sides of catoptron (17).
9. a kind of greenhouse gases according to claim 5 and stable isotope on-line monitoring system thereof, is characterized in that: the wavelength coverage of the laser that described tunable laser (6) produces is 1510-1640nm.
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| CN104819957A (en) * | 2015-02-11 | 2015-08-05 | 中国科学院长春光学精密机械与物理研究所 | CRDS principle-based gas concentration measurement system of continuously adjustable laser light source |
| CN105911020A (en) * | 2016-04-15 | 2016-08-31 | 中国科学院光电技术研究所 | Method for simultaneously measuring multi-component gas based on cavity ring-down spectroscopy |
| CN106483069A (en) * | 2015-08-26 | 2017-03-08 | 西安泰戈分析仪器有限责任公司 | Trace gas on-line analyses device based on cavity attenuation and vibration technique |
| CN108562550A (en) * | 2018-04-04 | 2018-09-21 | 中国计量科学研究院 | A kind of frequency stabilization cavity ring-down spectroscopy instrument of absolute measurement carbon in atmosphere isotopic content |
| CN109238975A (en) * | 2018-09-04 | 2019-01-18 | 深圳市卡普瑞环境科技有限公司 | The compatible gas circuit structure for flowing backward zero gas in a kind of atmospheric molecule detection system |
| CN109459396A (en) * | 2018-12-04 | 2019-03-12 | 南京信息工程大学 | The online laser acquisition analyzer of Atmospheric particulates carbon isotope and its application method |
| CN109580541A (en) * | 2018-12-07 | 2019-04-05 | 中国科学院长春光学精密机械与物理研究所 | A kind of optical heterodyne cavity ring-down spectroscopy measuring device and method |
| CN111366543A (en) * | 2018-12-26 | 2020-07-03 | 中石化石油工程技术服务有限公司 | Gas delta with multi-alkane component13C isotope logging method and device |
| CN112691627A (en) * | 2020-12-14 | 2021-04-23 | 浙江华电器材检测研究所有限公司 | CRDS-based product sampling device, product detection system and product detection method |
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| CN104819957A (en) * | 2015-02-11 | 2015-08-05 | 中国科学院长春光学精密机械与物理研究所 | CRDS principle-based gas concentration measurement system of continuously adjustable laser light source |
| CN106483069A (en) * | 2015-08-26 | 2017-03-08 | 西安泰戈分析仪器有限责任公司 | Trace gas on-line analyses device based on cavity attenuation and vibration technique |
| CN105911020A (en) * | 2016-04-15 | 2016-08-31 | 中国科学院光电技术研究所 | Method for simultaneously measuring multi-component gas based on cavity ring-down spectroscopy |
| CN105911020B (en) * | 2016-04-15 | 2018-11-30 | 中国科学院光电技术研究所 | Method for simultaneously measuring multi-component gas based on cavity ring-down spectroscopy |
| CN108562550A (en) * | 2018-04-04 | 2018-09-21 | 中国计量科学研究院 | A kind of frequency stabilization cavity ring-down spectroscopy instrument of absolute measurement carbon in atmosphere isotopic content |
| CN109238975A (en) * | 2018-09-04 | 2019-01-18 | 深圳市卡普瑞环境科技有限公司 | The compatible gas circuit structure for flowing backward zero gas in a kind of atmospheric molecule detection system |
| CN109459396A (en) * | 2018-12-04 | 2019-03-12 | 南京信息工程大学 | The online laser acquisition analyzer of Atmospheric particulates carbon isotope and its application method |
| CN109459396B (en) * | 2018-12-04 | 2023-08-25 | 南京信息工程大学 | Online laser detection analyzer for carbon isotopes of atmospheric particulates and application method thereof |
| CN109580541A (en) * | 2018-12-07 | 2019-04-05 | 中国科学院长春光学精密机械与物理研究所 | A kind of optical heterodyne cavity ring-down spectroscopy measuring device and method |
| CN111366543A (en) * | 2018-12-26 | 2020-07-03 | 中石化石油工程技术服务有限公司 | Gas delta with multi-alkane component13C isotope logging method and device |
| CN112691627A (en) * | 2020-12-14 | 2021-04-23 | 浙江华电器材检测研究所有限公司 | CRDS-based product sampling device, product detection system and product detection method |
| CN112691627B (en) * | 2020-12-14 | 2024-09-13 | 浙江华电器材检测研究院有限公司 | CRDS-based product sampling device, product detection system and product detection method |
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Application publication date: 20140430 |