CN104865207A - Optical cavity ring-down spectrograph based haze detection system - Google Patents
Optical cavity ring-down spectrograph based haze detection system Download PDFInfo
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- CN104865207A CN104865207A CN201510222882.0A CN201510222882A CN104865207A CN 104865207 A CN104865207 A CN 104865207A CN 201510222882 A CN201510222882 A CN 201510222882A CN 104865207 A CN104865207 A CN 104865207A
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Abstract
The invention discloses an optical cavity ring-down spectrograph based haze detection system. The system comprises a haze air inlet and pre-processing system, a haze information detection system, a data processing unit and a control system. The haze air inlet and pre-processing system provides sample air and background air in different relative humidity for the haze information detection system through an optical cavity ring-down spectroscopic method to acquire and process data obtained by the haze information detection system. According to the system, aerosol extinction coefficients in different relative humidity conditions are measured simultaneously through a different humidity observation method, parameter gamma values are obtained through calculation, extinction coefficients of atmospheric aerosols when the relative humidity is set are obtained through calculation, the contribution condition of the humidity to atmospheric extinction is obtained, and aerosol categories are represented through the parameter gamma values by combining with weather information and component analysis. The system has the advantages that the measuring accuracy is high, the detection error is small, and the system can be applied to online analysis detection of effects of atmosphere haze optical properties and relative humidity on haze optical properties.
Description
Technical field
The present invention relates to a kind of atmospheric optics detection system, particularly relate to a kind of optical property detection system of atmosphere pollution, be applied to atmospheric physics chemical property pick-up unit technical field.
Background technology
According to the definition of American National Environmental Protection Administration EPA, gray haze refers to that dust, sulfuric acid and sulfate in air, nitric acid and the particle such as nitrate, organic hydrocarbon compounds are by photoextinction, makes that air is muddy, the visual field is fuzzy and causes the weather phenomenon of visibility deterioration.Because aerocolloidal optical characteristics is determined by aerocolloidal chemical composition, particle size, shape and admixture, and these character are all relevant with the relative humidity of air, when relative humidity reaches more than 60%, relative humidity itself, the controlling factor that the moisture that gasoloid absorbs in other words just becomes to take as the leading factor, when relative humidity reaches 70% ~ 80%, moisture usually to the contribution of gasoloid gross mass up to 50%, even more.Therefore, accurately and reliably the impact of humidity on gray haze optical property is measured and studied to gray haze optical property, be extremely important.
At present, the domestic research for haze weather mainly concentrates on judgement to gray haze, climate characteristic, level of pollution, spatial and temporal distributions, the aspect such as aerosol chemistry and source resolution, but is not also very comprehensive for the research of the relation of relative humidity and gray haze optical property.The instruments and methods measuring atmospheric aerosol optical property is a lot, and such as integration turbidimeter, black carbon instrument, Research on Cavity Ring Down Spectroscopy etc., the wherein aerocolloidal extinction coefficient of cavity ring down spectroscopy technology energy Measurement accuracy, uncertainty is less than 3%.But these surveying instruments and method can only record the single optical property of gray haze, the impact of humidity on gray haze optical property accurately cannot be recorded.
Summary of the invention
In order to solve prior art problem, the object of the invention is to the deficiency overcoming prior art existence, a kind of gray haze detection system based on cavity ring-down spectroscopy instrument is provided, accurately can record the extinction coefficient of atmospheric aerosol under different relative humidity, obtain the extinction coefficient of gray haze under EPA standard and humidity to the impact of gray haze extinction coefficient.
Create object for reaching foregoing invention, the present invention adopts following technical proposals:
A kind of gray haze detection system based on cavity ring-down spectroscopy instrument, comprise gray haze air inlet and pretreatment system, gray haze information detecting system, data processing equipment and control system, gray haze air to be measured is after gray haze air inlet and pretreatment system, formed and there is sample air under different relative humidity and background air, carry to gray haze information detecting system respectively by different air supply systems again, gray haze information detecting system detects the sample air under different relative humidity and background air respectively, gray haze information detecting system adopts cavity ring-down spectroscopy detection method, the extinction coefficient of the gray haze under different relative humidity is detected, obtain the extinction coefficient of the sample air containing gray haze when the different relative humidity of correspondence, data processing equipment carries out computing to the data that gray haze information detecting system obtains, finally obtain relative humidity to the contribution coefficient of atmospheric aerosol delustring character and factor of influence, control system is to gray haze sample introduction and pretreatment system, gray haze information detecting system and data processing equipment carry out Power supply and control respectively.
As the preferred technical scheme of the present invention, data processing equipment carries out to the data that gray haze information detecting system obtains the relative humidity that computing obtains and adopts dimensionless group γ value to the contribution coefficient of atmospheric aerosol delustring character and factor of influence, control system built-in γ value computing module, γ value specifically represents the extinction coefficient of atmospheric aerosol and the relation of relative humidity, and its relation formula is:
In above-mentioned formula,
α epRH for extinction coefficient aerocolloidal under envionmental humidity,
α epRHref for aerocolloidal extinction coefficient under reference relative humidity,
rH ref for reference relative humidity,
rHfor envionmental humidity.Aerocolloidal kind, source difference, its γ value is also different.To a certain extent, this parameter characterization gasoloid classification can be passed through.
As technical scheme preferred in the invention described above technical scheme, gray haze air inlet and pretreatment system are primarily of the first Temperature Humidity Sensor, electric T-shaped valve, filtrator, gas drier, the second Temperature Humidity Sensor, first flow control device, second amount control device and aspiration pump, filtrator filters initial sample introduction air, the first Temperature Humidity Sensor testing environment relative humidity
rH, the second Temperature Humidity Sensor detects the reference relative humidity of relative humidity as sample air of the setting of sample air
rH ref gray haze information detecting system is made up of the first cavity ring-down spectroscopy instrument and the second cavity ring-down spectroscopy instrument, the extinction coefficient of extinction coefficient as the gray haze with reference to sample air under relative humidity of the gray haze of the sample air under setting damp condition measured by first cavity ring-down spectroscopy instrument, the extinction coefficient of the gray haze of the background air of the second cavity ring-down spectroscopy instrument under ambient relative humidity
α epRH , formation background air detection pipeline between the initial air intake opening and the air entry of aspiration pump of gray haze air inlet and pretreatment system, background air signal piping sets gradually the first Temperature Humidity Sensor, electric T-shaped valve, filtrator, second cavity ring-down spectroscopy instrument and second amount control device, between the initial air intake opening that first Temperature Humidity Sensor is arranged at gray haze air inlet and pretreatment system and the air intake opening of electric T-shaped valve, filtrator is arranged between the first gas outlet of electric T-shaped valve and the injection port of the second cavity ring-down spectroscopy instrument, second gas outlet of electric T-shaped valve is also by being directly communicated with the injection port of the second cavity ring-down spectroscopy instrument a communicating pipe, second amount control device is arranged on the air entry pipeline of aspiration pump, the outlet connecting pipe road of filtrator, second gas outlet connecting line of electric T-shaped valve is communicated with the injection port connecting line of the second cavity ring-down spectroscopy instrument and intersects at sample feeding pipe circuit node, sample air signal piping is also provided with between sample feeding pipe circuit node and the air entry of aspiration pump, sample air signal piping sets gradually gas drier, second Temperature Humidity Sensor, first cavity ring-down spectroscopy instrument and first flow control device, the inlet end of gas drier and outlet side are connected respectively on sample feeding pipe circuit node and the second Temperature Humidity Sensor pipeline, first flow control device is also arranged on the air entry pipeline of aspiration pump, after gas to be measured enters gray haze air inlet and pretreatment system by initial air intake opening, control aspiration pump by control system and power is provided, sample air and background air are imported respectively the first cavity ring-down spectroscopy instrument and the second cavity ring-down spectroscopy instrument, thus the sample air remained in the first cavity ring-down spectroscopy instrument is consistent with the particulate component in the background air in the second cavity ring-down spectroscopy instrument, by controlling electric T-shaped valve, make in the second cavity ring-down spectroscopy instrument and in the first cavity ring-down spectroscopy instrument and respectively sample introduction background air and the sample air under set environment relative humidity, control system controls the sample introduction air-flow velocity of the first cavity ring-down spectroscopy instrument and the second cavity ring-down spectroscopy instrument respectively respectively by first flow control device and second amount control device, keep consistance and the stability of sample air flow velocity and background air flow velocity, control system respectively with the first Temperature Humidity Sensor, electric T-shaped valve, second Temperature Humidity Sensor, gas drier, first cavity ring-down spectroscopy instrument is connected with the second cavity ring-down spectroscopy instrument signal and powers.
As the technical scheme improved in technique scheme of the present invention, the outside of gray haze sample introduction and pretreatment system and gray haze information detecting system is all enclosed with heat preserving and insulating material.
The present invention compared with prior art, has following apparent outstanding substantive distinguishing features and remarkable advantage:
1. the gray haze detection system that the present invention is based on cavity ring-down spectroscopy instrument periodically passes into two cavity ring-down spectroscopy instrument by the background gas under different humidity condition with the sample gas of particle by gray haze sample introduction process air-channel system, by the method that differentiation humidity is observed, aerocolloidal extinction coefficient under simultaneously recording different relative humidities, by calculating parameter γ value, the extinction coefficient of the atmospheric aerosol when relative humidity is zero can be obtained, the i.e. extinction coefficient of gray haze under EPA standard, and the impact of humidity on atmospheric extinction can be obtained;
2. the gray haze detection system that the present invention is based on cavity ring-down spectroscopy instrument, can be characterized aerocolloidal classification in conjunction with weather information and constituent analysis by detection computations parameter γ value;
3. the gray haze detection system energy Measurement accuracy gray haze extinction coefficient and the relative humidity that the present invention is based on cavity ring-down spectroscopy instrument affect gray haze optical property, the on-line checkingi analysis that gray haze optical property and relative humidity affect gray haze optical property can be realized, on research humidity on the impact of gray haze, be extremely important;
4. the present invention is based on the gray haze detection system of cavity ring-down spectroscopy instrument based on cavity ring down spectroscopy technology, measuring accuracy is high, metrical error is little, can be applicable to Brownish haze optical property and relative humidity and detects the on-line analysis that gray haze optical property affects.
Accompanying drawing explanation
Fig. 1 is the gray haze detection system structural representation that the present invention is based on cavity ring-down spectroscopy instrument.
Embodiment
Details are as follows for the preferred embodiments of the present invention:
In the present embodiment, see Fig. 1, based on the gray haze detection system of cavity ring-down spectroscopy instrument, comprise gray haze air inlet and pretreatment system, gray haze information detecting system, data processing equipment 11 and control system 12, gray haze air inlet and pretreatment system are primarily of the first Temperature Humidity Sensor 1, electric T-shaped valve 2, filtrator 3, gas drier 5, second Temperature Humidity Sensor 4, first flow control device 9, second amount control device 10 and aspiration pump 8, filtrator 3 filters initial sample introduction air, the first Temperature Humidity Sensor 1 testing environment relative humidity
rH, the second Temperature Humidity Sensor 4 detects the reference relative humidity of the dried sample air of sample air
rH ref gray haze information detecting system is made up of the first cavity ring-down spectroscopy instrument 6 and the second cavity ring-down spectroscopy instrument 7, the extinction coefficient of extinction coefficient as the gray haze with reference to sample air under relative humidity of the gray haze of sample air after the drying measured by first cavity ring-down spectroscopy instrument 6, the extinction coefficient of the gray haze of the background air of the second cavity ring-down spectroscopy instrument 7 under ambient relative humidity
α epRH , formation background air detection pipeline between the initial air intake opening and the air entry of aspiration pump 8 of gray haze air inlet and pretreatment system, background air signal piping sets gradually the first Temperature Humidity Sensor 1, electric T-shaped valve 2, filtrator 3, second cavity ring-down spectroscopy instrument 7 and second amount control device 10, between the initial air intake opening that first Temperature Humidity Sensor 1 is arranged at gray haze air inlet and pretreatment system and the air intake opening A of electric T-shaped valve 2, filtrator 3 is arranged between the first gas outlet C of electric T-shaped valve 2 and the injection port of the second cavity ring-down spectroscopy instrument 7, second gas outlet B of electric T-shaped valve 2 is also by being directly communicated with the injection port of the second cavity ring-down spectroscopy instrument 7 communicating pipe, second amount control device 10 is arranged on the air entry pipeline of aspiration pump 8, the outlet connecting pipe road of filtrator 3, second gas outlet B connecting line of electric T-shaped valve 2 is communicated with the injection port connecting line of the second cavity ring-down spectroscopy instrument 7 and intersects at sample feeding pipe circuit node, sample air signal piping is also provided with between sample feeding pipe circuit node and the air entry of aspiration pump 8, sample air signal piping sets gradually gas drier 5, second Temperature Humidity Sensor 4, first cavity ring-down spectroscopy instrument 6 and first flow control device 9, the inlet end of gas drier 5 and outlet side are connected respectively on sample feeding pipe circuit node and the second Temperature Humidity Sensor 4 pipeline, first flow control device 9 is also arranged on the air entry pipeline of aspiration pump 8, after gas to be measured enters gray haze air inlet and pretreatment system by initial air intake opening, control aspiration pump 8 by control system 12 and power is provided, sample air and background air are imported respectively the first cavity ring-down spectroscopy instrument 6 and the second cavity ring-down spectroscopy instrument 7, thus the sample air remained in the first cavity ring-down spectroscopy instrument 6 is consistent with the particulate component in the background air in the second cavity ring-down spectroscopy instrument 7, by controlling electric T-shaped valve 2, to make in the second cavity ring-down spectroscopy instrument 7 and in the first cavity ring-down spectroscopy instrument 6 and respectively sample introduction background air and sample air after the drying, control system 12 controls the sample introduction air-flow velocity of the first cavity ring-down spectroscopy instrument 6 and the second cavity ring-down spectroscopy instrument 7 respectively respectively by first flow control device 9 and second amount control device 10, keep consistance and the stability of sample air flow velocity and background air flow velocity, control system 12 respectively with the first Temperature Humidity Sensor 1, electric T-shaped valve 2, second Temperature Humidity Sensor 4, gas drier 5, first cavity ring-down spectroscopy instrument 6 is connected with the second cavity ring-down spectroscopy instrument 7 signal and powers.The present embodiment, by detecting the extinction coefficient of the gray haze under different relative humidity, can obtain the extinction coefficient of gray haze when relative humidity is zero, and humidity is on the impact of gray haze delustring character.
In the present embodiment, see Fig. 1, gray haze air to be measured is after gray haze air inlet and pretreatment system, formed and there is sample air under different relative humidity and background air, carry to gray haze information detecting system respectively by different air supply systems again, gray haze information detecting system detects the sample air under different relative humidity and background air respectively, gray haze information detecting system adopts cavity ring-down spectroscopy detection method, have highly sensitive, the feature that detectability is low, the extinction coefficient of the gray haze under different relative humidity is detected, obtain the extinction coefficient of the sample air containing gray haze when the different relative humidity of correspondence, the data that data processing equipment 11 pairs of gray haze information detecting systems obtain carry out computing, finally obtain relative humidity to the contribution coefficient of atmospheric aerosol delustring character and factor of influence, control system 12 pairs of gray haze sample introductions and pretreatment system, gray haze information detecting system and data processing equipment 11 carry out Power supply and control respectively, the outside of gray haze sample introduction and pretreatment system and gray haze information detecting system is all enclosed with insulation cotton, during to ensure to measure, gas to be measured is not by the impact of surrounding environment, in order to avoid cause volatile ingredient to lose or condensation vapor.
In the present embodiment, see Fig. 1, the data that data processing equipment 11 pairs of gray haze information detecting systems obtain are carried out the relative humidity that computing obtains and are adopted dimensionless group γ value to the contribution coefficient of atmospheric aerosol delustring character and factor of influence, control system 12 built-in γ value computing module, γ value specifically represents the extinction coefficient of atmospheric aerosol and the relation of relative humidity, and its relation formula is:
In above-mentioned formula,
α epRH for extinction coefficient aerocolloidal under envionmental humidity,
α epRHref for aerocolloidal extinction coefficient under reference relative humidity,
rH ref for reference relative humidity,
rHfor envionmental humidity.
the present embodiment is based on the principle of work of the gray haze detection system of cavity ring-down spectroscopy instrument:
After testing sample enters gray haze air inlet and pretreatment system, background gas circuit and sample gas gas circuit is divided into after electric T-shaped valve 2, be further divided into two-way, one tunnel enters the first cavity ring-down spectroscopy instrument 6 after gas drier 5, another road directly enters the second cavity ring-down spectroscopy instrument 7, the stroke of two-way gas is identical, first two-chamber ring-down spectrometer 6 records the ring-down time of dried sample gas and background gas, second cavity ring-down spectroscopy instrument 7 records the ring-down time of the sample gas under envionmental humidity humidity, the extinction coefficient of testing sample under two kinds of humidity can be calculated thus, thus calculate parameter γ value, obtain Dry aerosol extinction coefficient when relative humidity is zero, and the extinction coefficient of steam contribution, further by both ratio, obtain the contribution ratio of steam to Aerosol Extinction, the i.e. ratio of the extinction coefficient that causes of steam and Dry aerosol extinction coefficient.In real work, two are declined by aspiration pump 8 simultaneously and swing chamber gas circuit power is provided, order about testing sample gas and constantly enter into instrument, measure.In process, control system 12 controls each device device and powers, first cavity ring-down spectroscopy instrument 6 and the second cavity ring-down spectroscopy instrument 7 detect that the electric signal that obtains is undertaken gathering by data processing equipment 11, be transferred to host computer again after digitizing, carry out data processing.
In the present embodiment, first cavity ring-down spectroscopy instrument 6 and the second cavity ring-down spectroscopy instrument 7 form two detection zones, first cavity ring-down spectroscopy instrument 6 is for measuring the extinction coefficient of dried gray haze, second cavity ring-down spectroscopy instrument 7 is for the extinction coefficient of the gray haze under measurement environment relative humidity, utilize two cavity ring-down spectroscopy instrument, by the method that differentiation humidity is observed, aerocolloidal extinction coefficient under simultaneously recording different relative humidities, by calculating parameter γ value, obtain the extinction coefficient of the atmospheric aerosol when relative humidity is zero, and the impact of humidity on atmospheric extinction can be obtained.In addition, also by parameter γ value in conjunction with weather information and constituent analysis, aerocolloidal classification is characterized.What the present embodiment adopted based on the gray haze detection system of cavity ring-down spectroscopy instrument is cavity ring down spectroscopy technology and equipment, due to the impact not by the intensity of light source, and equivalent optical path length, there is highly sensitive, that detectability is low feature, adopt the structure of two-chamber, accuracy and the reliability of the gray haze extinction coefficient under the different relative humidity recorded can be ensured.
By reference to the accompanying drawings the embodiment of the present invention is illustrated above; but the invention is not restricted to above-described embodiment; multiple change can also be made according to the object of innovation and creation of the present invention; change, the modification made under all Spirit Essences according to technical solution of the present invention and principle, substitute, combination or simplify; all should be the substitute mode of equivalence; as long as goal of the invention according to the invention; only otherwise deviate from know-why and the inventive concept of the gray haze detection system that the present invention is based on cavity ring-down spectroscopy instrument, all protection scope of the present invention is belonged to.
Claims (4)
1. the gray haze detection system based on cavity ring-down spectroscopy instrument, comprise gray haze air inlet and pretreatment system, gray haze information detecting system, data processing equipment (11) and control system (12), it is characterized in that: gray haze air to be measured is after described gray haze air inlet and pretreatment system, formed and there is sample air under different relative humidity and background air, carry to described gray haze information detecting system respectively by different air supply systems again, described gray haze information detecting system detects the sample air under different relative humidity and background air respectively, described gray haze information detecting system adopts cavity ring-down spectroscopy detection method, the extinction coefficient of the gray haze under different relative humidity is detected, obtain the extinction coefficient of the sample air containing gray haze when the different relative humidity of correspondence, described data processing equipment (11) carries out computing to the data that described gray haze information detecting system obtains, finally obtain relative humidity to the contribution coefficient of atmospheric aerosol delustring character and factor of influence, described control system (12) is to described gray haze sample introduction and pretreatment system, described gray haze information detecting system and described data processing equipment (11) carry out Power supply and control respectively.
2. according to claim 1 based on the gray haze detection system of cavity ring-down spectroscopy instrument, it is characterized in that: described data processing equipment (11) carries out to the data that described gray haze information detecting system obtains the relative humidity that computing obtains and adopts dimensionless group γ value to the contribution coefficient of atmospheric aerosol delustring character and factor of influence, described control system (12) built-in γ value computing module, γ value specifically represents the extinction coefficient of atmospheric aerosol and the relation of relative humidity, and its relation formula is:
In above-mentioned formula,
α epRH for extinction coefficient aerocolloidal under envionmental humidity,
α epRHref for aerocolloidal extinction coefficient under reference relative humidity,
rH ref for reference relative humidity,
rHfor envionmental humidity.
3. according to claim 2 based on the gray haze detection system of cavity ring-down spectroscopy instrument, it is characterized in that: described gray haze air inlet and pretreatment system are primarily of the first Temperature Humidity Sensor (1), electric T-shaped valve (2), filtrator (3), gas drier (5), the second Temperature Humidity Sensor (4), first flow control device (9), second amount control device (10) and aspiration pump (8), described filtrator (3) filters initial sample introduction air, described first Temperature Humidity Sensor (1) testing environment relative humidity
rH, described second Temperature Humidity Sensor (4) detects the reference relative humidity of relative humidity as sample air of the setting of sample air
rH ref described gray haze information detecting system is made up of the first cavity ring-down spectroscopy instrument (6) and the second cavity ring-down spectroscopy instrument (7), the extinction coefficient of extinction coefficient as the gray haze with reference to sample air under relative humidity of the gray haze of the sample air under setting damp condition measured by described first cavity ring-down spectroscopy instrument (6), the extinction coefficient of the gray haze of described second cavity ring-down spectroscopy instrument (7) background air under ambient relative humidity
α epRH formation background air detection pipeline between the initial air intake opening and the air entry of described aspiration pump (8) of described gray haze air inlet and pretreatment system, background air signal piping sets gradually described first Temperature Humidity Sensor (1), electric T-shaped valve (2), described filtrator (3), described second cavity ring-down spectroscopy instrument (7) and described second amount control device (10), described first Temperature Humidity Sensor (1) is arranged between the initial air intake opening of described gray haze air inlet and pretreatment system and the air intake opening (A) of described electric T-shaped valve (2), described filtrator (3) is arranged between first gas outlet (C) of described electric T-shaped valve (2) and the injection port of described second cavity ring-down spectroscopy instrument (7), second gas outlet (B) of described electric T-shaped valve (2) is also by being directly communicated with the injection port of described second cavity ring-down spectroscopy instrument (7) communicating pipe, described second amount control device (10) is arranged on the air entry pipeline of described aspiration pump (8), the outlet connecting pipe road of described filtrator (3), second gas outlet (B) connecting line of described electric T-shaped valve (2) is communicated with the injection port connecting line of described second cavity ring-down spectroscopy instrument (7) and intersects at sample feeding pipe circuit node, sample air signal piping is also provided with between described sample feeding pipe circuit node and the air entry of described aspiration pump (8), described sample air signal piping sets gradually described gas drier (5), described second Temperature Humidity Sensor (4), described first cavity ring-down spectroscopy instrument (6) and described first flow control device (9), the inlet end of described gas drier (5) and outlet side are connected respectively on described sample feeding pipe circuit node and described second Temperature Humidity Sensor (4) pipeline, described first flow control device (9) is also arranged on the air entry pipeline of described aspiration pump (8), after gas to be measured enters described gray haze air inlet and pretreatment system by initial air intake opening, control described aspiration pump (8) by described control system (12) and power is provided, sample air and background air are imported respectively described first cavity ring-down spectroscopy instrument (6) and described second cavity ring-down spectroscopy instrument (7), thus the sample air remained in described first cavity ring-down spectroscopy instrument (6) is consistent with the particulate component in the background air in described second cavity ring-down spectroscopy instrument (7), by controlling described electric T-shaped valve (2), make in described second cavity ring-down spectroscopy instrument (7) and in the first cavity ring-down spectroscopy instrument (6) and respectively sample introduction background air and the sample air under set environment relative humidity, described control system (12) controls the sample introduction air-flow velocity of described first cavity ring-down spectroscopy instrument (6) and described second cavity ring-down spectroscopy instrument (7) respectively respectively by described first flow control device (9) and described second amount control device (10), keep consistance and the stability of sample air flow velocity and background air flow velocity, described control system (12) respectively with described first Temperature Humidity Sensor (1), described electric T-shaped valve (2), described second Temperature Humidity Sensor (4), described gas drier (5), described first cavity ring-down spectroscopy instrument (6) is connected with described second cavity ring-down spectroscopy instrument (7) signal and powers.
4. according to the gray haze detection system based on cavity ring-down spectroscopy instrument described in any one in claims 1 to 3, it is characterized in that: the outside of gray haze sample introduction and pretreatment system and gray haze information detecting system is all enclosed with heat preserving and insulating material.
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