JPH1010044A - Gas concentration measuring method by multiple wave length light - Google Patents
Gas concentration measuring method by multiple wave length lightInfo
- Publication number
- JPH1010044A JPH1010044A JP8178705A JP17870596A JPH1010044A JP H1010044 A JPH1010044 A JP H1010044A JP 8178705 A JP8178705 A JP 8178705A JP 17870596 A JP17870596 A JP 17870596A JP H1010044 A JPH1010044 A JP H1010044A
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- Japan
- Prior art keywords
- wavelength
- wavelengths
- light
- gas
- gas concentration
- Prior art date
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Investigating Or Analysing Materials By Optical Means (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、多波長光により大
気中のガス（原子、分子、エアロゾル等）濃度を計測す
る方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the concentration of gas (atoms, molecules, aerosols, etc.) in the atmosphere using multi-wavelength light.
【０００２】[0002]
【従来の技術】大気中のガス濃度を測定する方法とし
て、例えば図 に示すように、単体又は複数の多波長光
照射装置１から多波長の光２を順次に計測対象ガス３に
照射し、その多波長の光を受光装置４により受光し、デ
ータ解析装置５により計測対象ガス３の構成成分の濃度
計測を行う方法がある。この多波長光を用いる従来の計
測方法であるレーザレーダは、計測対象ガスにより吸収
され易い（吸収の大きい）波長と、吸収され難い（吸収
の小さい）波長の２波長を用いた差分吸収レーザレーダ
（ＤＩＡＬ）計測法が用いられている。また、さらに精
度を高めるために、３つ以上の多波長を用いる測定方法
がある。この従来の２波長を用いたＤＩＡＬ計測法にお
ける受信光子数は、式１で現される。2. Description of the Related Art As a method of measuring the concentration of gas in the atmosphere, for example, as shown in FIG. There is a method in which the multi-wavelength light is received by the light receiving device 4 and the concentration of the constituents of the measurement target gas 3 is measured by the data analysis device 5. A laser radar, which is a conventional measurement method using this multi-wavelength light, is a differential absorption laser radar using two wavelengths, a wavelength that is easily absorbed (large absorption) and a wavelength that is hardly absorbed (small absorption) by the gas to be measured. (DIAL) measurement method is used. Further, there is a measurement method using three or more multi-wavelengths to further improve the accuracy. The number of received photons in the conventional DIAL measurement method using two wavelengths is expressed by Equation 1.
【０００３】[0003]
【数１】 ここで、Ｎr は受信光子数，Ｎt は照射光子数，ηは光
学系全効率，ΔＲは距離分解能，βb は後方散乱係数，
Ａは受信面積，Ｒは測定距離，βa は消散係数である。
このＤＩＡＬ計測法では、式１を２波長について記述
し、その差を求めることにより表される。そこで、測定
したいガス濃度ｎ（Ｒ）及び吸収断面積σにより、βa
＝σｎ（Ｒ）と表され、２つの波長に対してσのみが異
なる場合、一般的なＤＩＡＬ計測法の式として、次の式
２で表される。(Equation 1) Here, Nr is the number of received photons, Nt is the number of irradiated photons, η is the overall efficiency of the optical system, ΔR is the distance resolution, βb is the backscattering coefficient,
A is the reception area, R is the measured distance, and βa is the extinction coefficient.
In the DIAL measurement method, Expression 1 is described for two wavelengths, and the difference is obtained. Therefore, βa is determined by the gas concentration n (R) to be measured and the absorption cross section σ.
= Σn (R), and when only σ is different for two wavelengths, it is expressed by the following expression 2 as a general expression of the DIAL measurement method.
【０００４】[0004]
【数２】 σonとσoff は、それぞれ、吸収の大きい波長と吸収の
小さい波長に対する吸収断面積である。(Equation 2) .sigma.on and .sigma.off are absorption cross-sections for wavelengths having large absorption and small absorption, respectively.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、この式
２の場合は、前提条件として測定対象ガス以外のガスに
よる吸収や散乱の影響が、２つの波長に対して同じであ
ると見做せる場合に限られるものである。即ち、２波長
での消散係数βa が測定対象ガスのみで異なる場合に成
り立つものであり、他のガスの影響がある場合は成り立
たないのである。そして、測定対象ガス以外のガスに対
して、消散係数βa が同じ２波長を選ぶことは困難な場
合が多く、２波長を用いるＤＩＡＬ計測法では、測定対
象となるガス以外の消散係数（吸収断面積）が等しくな
い場合は、誤差があるため測定精度が悪いという問題が
ある。また、３つ以上の多波長を用いる測定は、用いる
波長の数に応じた回数の測定を必要とし、計測に長時間
を必要とする問題があった。However, in the case of Equation 2, as a precondition, the influence of absorption and scattering by gases other than the gas to be measured can be considered to be the same for two wavelengths. It is limited. In other words, this holds when the extinction coefficient βa at two wavelengths differs only for the gas to be measured, and does not hold when there is an effect of another gas. In addition, it is often difficult to select two wavelengths having the same extinction coefficient βa for gases other than the gas to be measured, and in the DIAL measurement method using two wavelengths, the extinction coefficient (absorption absorption) other than the gas to be measured is difficult. If the (areas) are not equal, there is a problem that the measurement accuracy is poor due to an error. In addition, the measurement using three or more multi-wavelengths requires the number of measurements according to the number of wavelengths to be used, and has a problem that the measurement requires a long time.
【０００６】[0006]
【課題を解決するための手段】本発明による多波長光に
よるガス濃度計測方法は、大気中の各種測定対象ガス
に、吸収され易い波長の光と吸収され難い波長の光を照
射し、それぞれの照射光の大気からの後方散乱光（反射
光）を望遠鏡で受光して測定する差分吸収レーザーレー
ダー（ＤＩＡＬ）計測法を用いるガス濃度計測方法にお
いて、測定対象ガスに対して、吸収され易い異なる波長
の２波長と、吸収され難い異なる波長の２波長であっ
て、かつ前記吸収され易い２波長の測定誤差対象ガスに
対する消散係数の和と前記吸収され難い２波長の測定誤
差対象ガスに対する消散係数の和とが等しくなるように
４波長をそれぞれ選定し、前記吸収され易い２波長の光
を１組とし、前記吸収され難い２波長の光を１組として
それぞれ前記測定対象ガスに照射し、該照射された２組
の反射光をそれぞれ受光し、該反射光の光子数に基づい
てガス濃度を計測することを特徴とするものである。A gas concentration measuring method using multi-wavelength light according to the present invention irradiates various kinds of gas to be measured in the atmosphere with light having a wavelength which is easily absorbed and light having a wavelength which is hardly absorbed. In a gas concentration measurement method using a differential absorption laser radar (DIAL) measurement method in which the backscattered light (reflected light) of irradiation light from the atmosphere is received by a telescope and measured, different wavelengths are easily absorbed by the gas to be measured. And the sum of the extinction coefficients for the measurement error target gases of the two wavelengths that are easily absorbed and the two wavelengths of different wavelengths that are hardly absorbed, and the extinction coefficient for the measurement error target gas of the two wavelengths that are hardly absorbed. The four wavelengths are respectively selected so that the sum is equal, the two-wavelength light that is easily absorbed is set as one set, and the two-wavelength light that is hardly absorbed is set as one set, and Irradiating the scan, the irradiated two sets of reflected light respectively received, is characterized in that to measure the gas concentration on the basis of the number of photons reflected light.
【０００７】[0007]
【発明の実施の形態】本発明を、４波長を用いた例につ
いて説明する。この４波長のうち２波長は測定対象ガス
に吸収され易い波長で、他の２波長は測定対象ガスに吸
収され難い波長を選定する。また、式１において、消散
係数βa のみが４波長で異なるものとする。そして、測
定対象ガスに吸収され易い２波長での消散係数をそれぞ
れβon1 ，βon2 、また測定対象ガスに吸収され難い２
波長での消散係数をそれぞれβoff1，βoff2とする。そ
して、測定対象ガスをｘ，誤差となるガスを０とする
と、各４波長の消散係数は式３で表される。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an example using four wavelengths. Two of the four wavelengths are wavelengths that are easily absorbed by the gas to be measured, and the other two wavelengths are wavelengths that are hardly absorbed by the gas to be measured. In addition, in Equation 1, it is assumed that only the extinction coefficient βa differs at four wavelengths. The extinction coefficients at two wavelengths, which are easily absorbed by the gas to be measured, are βon1 and βon2, respectively.
Let the extinction coefficients at wavelengths be βoff1 and βoff2, respectively. If the gas to be measured is x and the gas that causes the error is 0, the extinction coefficient for each of the four wavelengths is expressed by Equation 3.
【０００８】[0008]
【数３】 σi はそれぞれの波長に対する吸収断面積である。それ
ぞれの波長での式１を記述して、よく吸収する２波長
（on）での２式から、吸収しにくい２波長（off）の２
式を引くと、次の式４が導かれる。(Equation 3) σi is the absorption cross section for each wavelength. Equation 1 is described at each wavelength, and two equations at two wavelengths (off) that are hardly absorbed are obtained from two equations at two wavelengths (on) that absorb well.
When the equation is subtracted, the following equation 4 is derived.
【０００９】[0009]
【数４】 ここで、式５の(Equation 4) Where:
【数５】 であるような波長を選択すると、式４は次の式６(Equation 5) Equation 4 is given by the following equation 6:
【数６】 となり、誤差となる測定対象ガス以外のガスの影響が含
まれない式となる。(Equation 6) And the equation does not include the influence of gases other than the measurement target gas that cause an error.
【００１０】ここで、Here,
【数７】 とすると、式６の項(Equation 7) Then, the term of equation 6
【数８】 は、(Equation 8) Is
【００１１】[0011]
【数９】 となる。(Equation 9) Becomes
【００１２】同様に、式６の項のSimilarly, in the term of equation 6,
【数１０】 は、次の式１３に変換できる。(Equation 10) Can be converted into the following Expression 13.
【数１１】 [Equation 11]
【００１３】ただし、前述の式１１及び式１３は、次の
式１４又は式１５を条件とする。However, the above equations 11 and 13 are subject to the following equations 14 or 15.
【数１２】 よって、式６はさらに次の式１６のように変形できる。(Equation 12) Therefore, Expression 6 can be further modified as Expression 16 below.
【数１３】 即ち、測定は、４波長すべてを計測する必要がなく、on
（on1 ，on2 ）とoff（off1，off2）の２波長づつまと
めて計測することができるので、２波長を用いたＤＩＡ
Ｌ計測法と同じ時間で計測することが可能である。な
お、前述の式１４と式１５は、式１６に示すガス濃度ｎ
（Ｒ）の精度を高める条件を示すもので、式１４と式１
５の左辺が小さくなるように、波長に対する照射光の強
度を調節することにより、測定精度を向上させることが
可能である。(Equation 13) That is, the measurement does not need to measure all four wavelengths,
Since two wavelengths (on1, on2) and off (off1, off2) can be measured collectively, DIA using two wavelengths can be performed.
Measurement can be performed in the same time as the L measurement method. Equations (14) and (15) are used to calculate the gas concentration n shown in Equation (16).
This shows the condition for improving the accuracy of (R).
By adjusting the intensity of the irradiation light with respect to the wavelength so that the left side of 5 becomes smaller, it is possible to improve the measurement accuracy.
【００１４】[0014]
【実施例】測定対象ガスをＳＯ2 （二酸化硫黄）とし
て、前記計算式１６に、図１に示す公知の特性データに
基づく表１に示した数値（各波長におけるＳＯ2 の吸収
断面積）と、表１のデータにもとづいて算出された表２
に示した受信光子数を、式６および式１６に当てはめて
計算した例を示す。なお、エアロゾルの消散係数を、30
0nm で 2×10-4ｍ-1とし、エアロゾルによる光の消散が
レイリー散乱によると仮定し、 1／λ4 に比例するとす
る。ＳＯ2 の密度は、図１に示した吸収断面積の特性、
及び温度 15℃， 1atm ，単位 1ppb では、ｎ＝2.55×
1016ｍ-3であることにより、吸収の大きい波長を300.0n
m （on1 ）と298.6nm （on2 ）、吸収の小さい波長を29
9.3nm （off1,off2）の３つの波長で計算を行う。ここ
で、[Embodiment] Assuming that the gas to be measured is SO 2 (sulfur dioxide), the above equation (16) shows the numerical values (absorption cross section of SO 2 at each wavelength) shown in Table 1 based on the known characteristic data shown in FIG. , Table 2 calculated based on the data in Table 1
The following shows an example in which the number of received photons shown in FIG. The extinction coefficient of the aerosol is 30
At 0 nm, it is assumed to be 2 × 10 −4 m −1, and it is assumed that the extinction of light by the aerosol is due to Rayleigh scattering, which is proportional to 1 / λ 4 . The density of SO 2 depends on the characteristics of the absorption cross section shown in FIG.
And at temperature 15 ℃, 1atm, unit 1ppb, n = 2.55 ×
10 16 m -3 allows wavelengths with large absorption to be 300.0 n
m (on1) and 298.6 nm (on2), the wavelength of small absorption is 29
Calculation is performed at three wavelengths of 9.3 nm (off1, off2). here,
【数１４】 と仮定する。（光出力10J 、受光望遠鏡の直径50cm、後
方散乱係数 1.0×10-5m-1光学系全効率0.01に相当） また、測定距離Ｒを 3km、距離分解能ΔＲを100mとす
る。[Equation 14] Assume that (The light output is 10J, the diameter of the light receiving telescope is 50 cm, and the back scattering coefficient is 1.0 × 10 −5 m −1 , corresponding to an overall efficiency of the optical system of 0.01.) The measurement distance R is 3 km, and the distance resolution ΔR is 100 m.
【００１５】[0015]
【表１】 このときの受信される光子数を表２に示す。[Table 1] Table 2 shows the number of photons received at this time.
【００１６】[0016]
【表２】 以上により、式１１の左辺と右辺はともに有効数字が３
桁以内で 1.237となり、また式１３の左辺と右辺はとも
に有効数字が３桁以内で 0.808となり一致する。この条
件で、式６の従来の多波長によるＤＩＡＬ計測法で全４
波長を計測し、密度を算出すると2.35×1016cm-3となる
が、本発明の方法で密度を算出した場合においても、そ
の計測値は2.34×1016cm-3となり、２桁の精度で正し
く、誤差は無視できる程度のものである。なお、この実
施例では便宜上吸収され難い波長は１波長として示した
が、前記の式５の条件等を満たす波長の異なる２波長を
用いて、全４波長で計測できることは当然である。ま
た、吸収され難い波長を２波長とし、吸収され易い波長
を１波長として３波長を用いて計測してもよい。また、
式８に表２の計算データを入れてΔＮonを求めると、Δ
Ｎon＝Ｎon1 −Ｎon／2 ＝67.5となるが、298.6 nmの照
射強度を300.0 nmのそれより、9843／9708＝1.0139倍に
することにより、Ｎon1 とＮon2 がほとんど等しくな
り、ΔＮonはほとんど０となり、計算されるガス濃度ｎ
（Ｒ）は、近似式を用いるために生じる誤差はなくな
る。[Table 2] From the above, both the left side and the right side of Equation 11 have significant figures of 3
It is 1.237 within the digits, and both the left and right sides of Equation 13 are 0.808 when the significant digits are within 3 digits, and match. Under these conditions, a total of 4 in the conventional multi-wavelength DIAL measurement method of Equation 6
When the wavelength is measured and the density is calculated, it is 2.35 × 10 16 cm -3 , but even when the density is calculated by the method of the present invention, the measured value is 2.34 × 10 16 cm -3 , which is an accuracy of two digits. And the error is negligible. In this embodiment, the wavelength that is hardly absorbed is shown as one wavelength for convenience, but it is natural that the measurement can be performed at all four wavelengths using two different wavelengths that satisfy the condition of the above-described Expression 5. Alternatively, measurement may be performed using three wavelengths, with two wavelengths that are hardly absorbed and one wavelength that is easily absorbed. Also,
When the calculation data of Table 2 is put into Expression 8, ΔN on is obtained.
Although the N on = N on1 -N on / 2 = 67.5, than the irradiation intensity of the 298.6 nm of 300.0 nm, 9843/9708 = by the 1.0139-fold, N on1 and N on2 becomes almost equal, .DELTA.N on is almost 0, and the calculated gas concentration n
(R) eliminates the error caused by using the approximate expression.
【００１７】[0017]
【発明の効果】以上詳細に説明したように、本発明は所
要の条件に適合する異なる波長の３波長又は４波長を、
測定対象ガスに吸収され易い波長と吸収され難い波長の
２組に分けて順次に測定対象ガスに照射して，その複数
又は単数の波長の反射信号をそれぞれ受信してそのデー
タに基づき演算処理するものであるため、特に測定対象
ガス周辺の誤差となるガスによる光の吸収が大きい場合
には、従来の２波長によるＤＩＡＬ計測法に比較して、
測定精度の向上を図ることができる。また、従来の精度
向上を図るための３波長以上の多波長によるＤＩＡＬ計
測法に比較して、測定時間を短縮することができ、過渡
現象の測定も可能となるなどの効果を奏するものであ
る。As described in detail above, the present invention provides three or four different wavelengths that meet the required conditions.
The target gas is divided into two groups, a wavelength that is easily absorbed by the measurement target gas and a wavelength that is hardly absorbed by the measurement target gas, and is sequentially irradiated on the measurement target gas. In particular, when the absorption of light by the gas which becomes an error around the gas to be measured is large, compared to the conventional two-wavelength DIAL measurement method,
Measurement accuracy can be improved. Further, as compared with the conventional DIAL measurement method using multiple wavelengths of three or more wavelengths for improving accuracy, the measurement time can be shortened, and the effect of measuring a transient phenomenon can be obtained. .
【図１】本発明の一実施例の測定対象ガスＳＯ2 の波長
／吸収断面積の特性図である。FIG. 1 is a characteristic diagram of a wavelength / absorption cross-section of a measurement target gas SO 2 according to an embodiment of the present invention.
【図２】本発明の対象とするＤＩＡＬ計測方法の測定構
成概略図である。FIG. 2 is a schematic diagram of a measurement configuration of a DIAL measurement method according to the present invention.
１ 多波長光照射装置 ２ 多波長の光 ３ 計測対象ガス ４ 受光装置 ５ データ解析装置 1 Multi-wavelength light irradiation device 2 Multi-wavelength light 3 Gas to be measured 4 Light-receiving device 5 Data analysis device
Claims (4)
易い波長の光と吸収され難い波長の光を照射し、それぞ
れの照射光の大気からの後方散乱光（反射光）を望遠鏡
で受光して測定する差分吸収レーザーレーダー（ＤＩＡ
Ｌ）計測法を用いるガス濃度計測方法において、 測定対象ガスに対して、吸収され易い異なる波長の２波
長と、吸収され難い異なる波長の２波長であって、かつ
前記吸収され易い２波長の測定誤差対象ガスに対する消
散係数の和と前記吸収され難い２波長の測定誤差対象ガ
スに対する消散係数の和とが等しくなるように４波長を
それぞれ選定し、 前記吸収され易い２波長の光を１組とし、前記吸収され
難い２波長の光を１組としてそれぞれ前記測定対象ガス
に照射し、 該照射された２組の反射光をそれぞれ受光し、該反射光
の光子数に基づいてガス濃度を計測することを特徴とす
る多波長光によるガス濃度計測方法。1. A variety of gases to be measured in the atmosphere are irradiated with light having a wavelength that is easily absorbed and light having a wavelength that is hardly absorbed, and the backscattered light (reflected light) of each irradiation light from the atmosphere is received by a telescope. Differential absorption laser radar (DIA)
L) In a gas concentration measurement method using a measurement method, two wavelengths of different wavelengths that are easily absorbed and two wavelengths of different wavelengths that are hardly absorbed, and the two wavelengths that are easily absorbed are measured for a gas to be measured. Four wavelengths are respectively selected so that the sum of the extinction coefficient for the error target gas and the sum of the extinction coefficients for the two error wavelength measurement hardly absorbed gases are equal to each other. Irradiating the target gas with the two wavelengths of light that are difficult to be absorbed as one set, receiving the two sets of reflected light, and measuring the gas concentration based on the number of photons of the reflected light. A gas concentration measurement method using multi-wavelength light.
は吸収され難い異なる波長の２波長のうちのいずれか一
方の波長を１波長として、当該波長のデータの演算時に
２倍にして２波長分データとして処理するようにした請
求項１記載の多波長光によるガス濃度計測方法。2. One of the two wavelengths of the different wavelengths that are easily absorbed or the two wavelengths of the different wavelengths that are hardly absorbed is taken as one wavelength, and is doubled at the time of calculating data of the wavelength. 2. The method according to claim 1, wherein the gas concentration is measured as data.
波長をそれぞれ異なる波長の３波長以上をとしてデータ
解析処理するようにした請求項１記載の多波長光による
ガス濃度計測方法。3. The gas concentration measurement method using multi-wavelength light according to claim 1, wherein the wavelength that is easily absorbed and the wavelength that is hardly absorbed are analyzed using three or more different wavelengths.
い多波長の各波長の照射強度を、前記各波長の受信され
る光子数の比率にもとづいて調整するようにした請求項
１乃至３記載の多波長光によるガス濃度計測方法。4. The method according to claim 1, wherein the irradiation intensity of each wavelength of the multi-wavelength that is easily absorbed or the multi-wavelength that is hardly absorbed is adjusted based on a ratio of the number of photons received at each wavelength. Gas concentration measurement method using multi-wavelength light.
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| JP17870596A JP3636829B2 (en) | 1996-06-20 | 1996-06-20 | Gas concentration measurement method using multi-wavelength light |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17870596A JP3636829B2 (en) | 1996-06-20 | 1996-06-20 | Gas concentration measurement method using multi-wavelength light |
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| JP3636829B2 JP3636829B2 (en) | 2005-04-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7349094B2 (en) | 2002-12-11 | 2008-03-25 | Qinetiq Limited | Laser radar apparatus having multiple output wavelengths |
| CN104007088A (en) * | 2014-06-16 | 2014-08-27 | 中国人民解放军陆军军官学院 | Method for measuring geometrical factors of backscattering laser radar |
| KR102139815B1 (en) * | 2020-04-27 | 2020-07-30 | 한밭대학교 산학협력단 | Aerosol fine and coarse particle information extraction methods and system using more than two wavelength extinction |
| CN112268871A (en) * | 2020-11-24 | 2021-01-26 | 西南技术物理研究所 | Method for simultaneously measuring concentration of various polluted gases in atmosphere |
| KR20240018749A (en) * | 2022-08-03 | 2024-02-14 | 국립한밭대학교 산학협력단 | aerosol PM2.5 retrieval method and system from aerosol extinction coefficient Using wavelength dependent aerosol extinction coefficients power exponent |
-
1996
- 1996-06-20 JP JP17870596A patent/JP3636829B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7349094B2 (en) | 2002-12-11 | 2008-03-25 | Qinetiq Limited | Laser radar apparatus having multiple output wavelengths |
| CN104007088A (en) * | 2014-06-16 | 2014-08-27 | 中国人民解放军陆军军官学院 | Method for measuring geometrical factors of backscattering laser radar |
| KR102139815B1 (en) * | 2020-04-27 | 2020-07-30 | 한밭대학교 산학협력단 | Aerosol fine and coarse particle information extraction methods and system using more than two wavelength extinction |
| CN112268871A (en) * | 2020-11-24 | 2021-01-26 | 西南技术物理研究所 | Method for simultaneously measuring concentration of various polluted gases in atmosphere |
| CN112268871B (en) * | 2020-11-24 | 2024-01-26 | 西南技术物理研究所 | Method for simultaneously measuring concentration of various polluted gases in atmosphere |
| KR20240018749A (en) * | 2022-08-03 | 2024-02-14 | 국립한밭대학교 산학협력단 | aerosol PM2.5 retrieval method and system from aerosol extinction coefficient Using wavelength dependent aerosol extinction coefficients power exponent |
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| Publication number | Publication date |
|---|---|
| JP3636829B2 (en) | 2005-04-06 |
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