CN101907563B - Sulfur dioxide analyzer based on ultraviolet light-emitting diode and analysis method - Google Patents
Sulfur dioxide analyzer based on ultraviolet light-emitting diode and analysis method Download PDFInfo
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- CN101907563B CN101907563B CN2010102344462A CN201010234446A CN101907563B CN 101907563 B CN101907563 B CN 101907563B CN 2010102344462 A CN2010102344462 A CN 2010102344462A CN 201010234446 A CN201010234446 A CN 201010234446A CN 101907563 B CN101907563 B CN 101907563B
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Abstract
The invention discloses a sulfur dioxide analyzer based on an ultraviolet light-emitting diode, which comprises the ultraviolet light-emitting diode, an absorption cell, a spectrometer and a computer connected to the spectrometer, wherein an incident window and an emergent window which correspond to each other and are transparent to ultraviolet light are respectively arranged on two sides of the absorption cell, and an air inlet and an air outlet are also arranged on the absorption cell; an incident optical fiber is connected between the ultraviolet light-emitting diode and the incident window of the absorption cell, and two collimators are respectively arranged at two ends of the incident optical fiber; an emergent optical fiber is connected between the emergent window of the absorption cell and the spectrometer, and two collimators are respectively arranged at two ends of the emergent optical fiber; the included angle between the incident window and the ultraviolet light path and the included angle between the incident window and the ultraviolet light path are acute angles or obtuse angles close to right angles. The invention also discloses a sulfur dioxide analysis method based on the ultraviolet light-emitting diode. The invention has the advantages of accurate measurement, large measurement range and short measurement time.
Description
Technical field
The present invention relates to a kind of gas analyzing apparatus, especially relate to a kind of concentration that is used for measurement gas sulphuric dioxide based on the ultraviolet absorption method flue gas analyser, the invention still further relates to sulfur dioxide analyzing method based on UV LED.
Background technology
Sulphuric dioxide is a kind of important environmental pollution gas, has been classified as the routine measurement project, and declares one of content as environmental statistics.The concentration that detects sulphuric dioxide accurately and rapidly has vital role in environmental protection, environmental monitoring, environmental warning, pollution source control, evaluation of flue gas desulfurizer performance.
But because shortcoming such as current flue gas analyser commonly exists cross interference, Measuring Time is long and measuring accuracy is relatively poor, can not well satisfy the needs of on-line monitoring.It is low that the non-dispersion infrared absorption process is measured the sulphuric dioxide cost, but measuring accuracy is not high, only is fit to measure the sulphuric dioxide of high concentration; Ultraviolet fluorescence method measures that the sulphuric dioxide cost is very high, and measurement range is little, can not widespread use; And that the laboratory chemical method is measured the sulphuric dioxide time is long, can not be used for on-line monitoring, sulphuric dioxide situation that can not the current discharging of rapid reaction.
Summary of the invention
To problem set forth above, the sulphuric dioxide in-line analyzer that the object of the invention is to provide a kind of to be measured accurately, measurement range is big, Measuring Time is short.
The present invention realizes through following technical measures; A kind of flue gas analyser based on UV LED; Comprise UV LED, absorption cell, spectrometer and be connected the computing machine on the spectrometer; Said absorption cell both sides are respectively arranged with injecting window and penetrating window of corresponding and penetrating ultraviolet light, also are provided with air intake opening and exhausr port on the absorption cell; The injecting of said UV LED and absorption cell be connected with between the window one with the ultraviolet light of UV LED emission from injecting the incident optical that window imports absorption cell, the two ends of this incident optical are respectively arranged with a collimating apparatus; Be connected with between the ejaculation window of said absorption cell and the spectrometer one will penetrate the ultraviolet photo-sensitive cell in the ultraviolet photoconduction directive spectrometer that window penetrates outgoing optical fiber, the two ends of this outgoing optical fiber also are respectively arranged with a collimating apparatus; Wherein, inject window and to penetrate the angle that angle between the ultraviolet light path of window and transmission injects between the ultraviolet light path of window and ejaculation window and transmission be acute angle or obtuse angle near the right angle.
UV LED preferably can send the UV LED that wavelength coverage is the connection ultraviolet light of 290-320nm.
As a kind of optimal way, the spectral range of said optical fiber is 200-1100nm, and core diameter is 900um.
As a kind of optimal way, the measurement range of said spectrometer is 200-340nm, and grating indentation density is 2400mm
-1, resolution is 0.29nm.
As a kind of optimal way, said ultraviolet photo-sensitive cell is the linear CCD array, totally 3648 pixels, and each pixel is that 8um is wide, 200um is long.
As a kind of optimal way, the window of injecting of said absorption cell is a quartz material with penetrating window, and absorption cell side diameter is 22mm, and length is 102.5mm, and logical optical range is 200-2700nm.
Wherein, inject window and penetrate angle between the ultraviolet light path of window and transmission and inject window and penetrate preferred 75 degree of angle to 85 degree or 95 between the ultraviolet light path of window and transmission and spend to 105 and spend.
The invention also discloses a kind of sulfur dioxide analyzing method based on UV LED, its analytical procedure is:
One, detects SO
2The peak wavelength of gas and peak valley wavelength:
(1), elder generation charges into N from the air intake opening of absorption cell to absorption cell
2Gas;
(2), then open UV LED, by incident optical guiding absorption cell, ultraviolet light is penetrated by injecting window entering absorption cell by the collimating apparatus of the incident optical other end ultraviolet light after collimating apparatus becomes directional light at this moment;
(3), the N of ultraviolet light in absorption cell
2Aspiration receive the back by penetrate window through collimating apparatus by outgoing optical fiber direct light spectrometer, ultraviolet light is injected spectrometer by the collimating apparatus of the outgoing optical fiber other end;
(4), ultraviolet light in spectrometer inside through shining behind collimation, focal length, the diffraction on the ultraviolet photo-sensitive cell; Regulate the ultraviolet light of the emission 290-320nm wavelength of UV LED; And the absorption cross section that writes down each wavelength gives computing machine as blank correlation data, discharges N from the gas outlet of absorption cell
2Gas;
(5), charge into the SO of 500ppm again to absorption cell from the air intake opening of absorption cell
2Calibrating gas;
(6), then open UV LED, by incident optical guiding absorption cell, ultraviolet light is penetrated by injecting window entering absorption cell by the collimating apparatus of the incident optical other end ultraviolet light after collimating apparatus becomes directional light at this moment;
(7), the SO of ultraviolet light in absorption cell
2Gas absorption decay back by penetrate window through collimating apparatus by outgoing optical fiber direct light spectrometer, ultraviolet light is injected spectrometer by the collimating apparatus of the outgoing optical fiber other end;
(8), ultraviolet light through shining behind collimation, focal length, the diffraction on the ultraviolet photo-sensitive cell, regulates the ultraviolet light of the emission 290-320nm wavelength of UV LED in spectrometer inside, and writes down the absorption cross section of each wavelength, as SO
2The data of calibrating gas are given computing machine, discharge SO from the gas outlet of absorption cell
2Gas;
(9), computing machine passes through SO
2The data of calibrating gas and blank correlation data calculate the peaked emission wavelength of absorption cross section and count λ
1, this wavelength is called peak wavelength, and near the emission wavelength in minimal absorption cross section is counted λ
2, this wavelength is called the peak valley wavelength;
Two, carry out SO
2The detection of gas concentration:
(10), elder generation charges into SO to be measured from the air intake opening of absorption cell to absorption cell
2Gas;
(11), then open UV LED, by incident optical guiding absorption cell, ultraviolet light is penetrated by injecting window entering absorption cell by the collimating apparatus of the incident optical other end ultraviolet light after collimating apparatus becomes directional light at this moment;
(12), the SO of ultraviolet light in absorption cell
2Gas absorption decay back by penetrate window through collimating apparatus by outgoing optical fiber direct light spectrometer, ultraviolet light is injected spectrometer by the collimating apparatus of the outgoing optical fiber other end;
(13), ultraviolet light through shining behind collimation, focal length, the diffraction on the ultraviolet photo-sensitive cell, regulates the emission wavelength of UV LED in spectrometer inside, and detection peak wavelength X
1With the peak valley wavelength X
2Ultraviolet light SO to be measured in absorption cell
2The peak wavelength after the gas absorption decay and the absorption cross section of peak valley wavelength are counted σ (λ
1) and σ (λ
2) and be transferred to computing machine;
(14), the computing machine that is connected with spectrometer calculates SO to be measured through following formula
2The concentration of gas:
Wherein, C is a sulfur dioxide concentration; R is constant=8.314J/molK; T is a kelvin degree; P is a pressure, and unit is a handkerchief; N
ABe avogadros constant=6.022*10
23Mol
-1λ
1And λ
2Be respectively peak wavelength and peak valley wavelength; σ (λ
1) and σ (λ
2) be respectively the absorption cross section of peak wavelength and peak valley wavelength; L is a light path.
Through detecting SO
2The peak wavelength λ of gas
1Be 300.09nm, the peak valley wavelength X
2Be 301.47nm.
In water treatment system, use the present invention, can open rapidly, close and between different analytical approachs, change. it pumps into sampling valve with sample from sample pot through getting liquid pump; Simultaneously reagent is pumped into system; Sample gets into the sample loop of one or more sampling valves, and sampling valve is brought the sample of sample loop into pipe system through conversion with carrier fluid, and sample and reagent meet in spiral reaction coil pipe; Sample is able to mix in narrow spiral reaction coil pipe under laminar flow condition; Automatically accomplish the The whole analytical process of each sample by computer software control, eliminated the cross pollution of sample, also avoided artificial error.Thereby the efficient that improves whole water quality monitoring system with reduce cost.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 utilizes the present invention to detect the measurement data tabulation of variable concentrations sulphuric dioxide.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention is done further explain.
As shown in Figure 1; A kind of flue gas analyser based on UV LED; Comprise UV LED 1, absorption cell 3, spectrometer 5 and the computing machine 6 that is connected spectrometer 5 through USB; Said absorption cell 3 both sides are respectively arranged with injecting window 304 and penetrating window 302 of corresponding and penetrating ultraviolet light, also are provided with air intake opening 301 and exhausr port 303 on the absorption cell 3; The injecting of said UV LED 1 and absorption cell 3 be connected with between the window 304 one with the ultraviolet light of UV LED 1 emission from injecting the incident optical 2 that window 304 imports absorption cells 3, the two ends of this incident optical 2 are respectively arranged with a collimating apparatus 201 and 202; Be connected with between the ejaculation window 302 of said absorption cell 3 and the spectrometer 5 one will penetrate the linear CCD array 501 in the ultraviolet photoconduction directive spectrometer 5 that window 302 penetrates outgoing optical fiber 4, the two ends of this outgoing optical fiber 4 also are respectively arranged with a collimating apparatus 401 and 402; Wherein, inject window 304 and penetrate angle person between the ultraviolet light path of window 302 and transmission and 85 spend.
Wherein, the wavelength coverage that can send of UV LED 1 is 290-320nm; The spectral range of incident optical 2 and outgoing optical fiber 4 is 200-1100nm, and core diameter is 900um; The measurement range of spectrometer 5 is 200-340nm, and grating indentation density is 2400mm
-1, resolution is 0.29nm; Have 3648 pixels on the linear CCD array 501, each pixel is that 8um is wide, and 200um is long; The window 304 of injecting of absorption cell 3 is quartz materials with penetrating window 302, and the side diameter of absorption cell 3 is 22mm, and length is 102.5mm, and logical optical range is 200-2700nm.
Based on the sulfur dioxide analyzing method of UV LED, its analytical procedure is:
One, detects SO
2The peak wavelength of gas and peak valley wavelength:
(1), elder generation charges into N from the air intake opening 301 of absorption cell 3 to absorption cell 3
2Gas;
(2), then open UV LED 1, by incident optical 2 guiding absorption cells 3, ultraviolet light is penetrated by injecting window 304 entering absorption cells 3 by the collimating apparatus 202 of incident optical 2 other ends ultraviolet light after collimating apparatus 201 becomes directional light at this moment;
(3), the N of ultraviolet light in absorption cell 3
2Aspiration receive the back by penetrate window 302 through collimating apparatus 401 by outgoing optical fiber 4 direct light spectrometers 5, ultraviolet light is injected spectrometer 5 by the collimating apparatus 402 of outgoing optical fiber 4 other ends;
(4), ultraviolet light in spectrometer 5 inside through shining behind collimation, focal length, the diffraction on the linear CCD array 501; Regulate the ultraviolet light of UV LED 1 emission 290-320nm wavelength; And the absorption cross section that writes down each wavelength gives computing machine 6 as blank correlation data, discharges N from the gas outlet 303 of absorption cell 3
2Gas;
(5), charge into the SO of 500ppm again to absorption cell 3 from the air intake opening 301 of absorption cell 3
2Calibrating gas;
(6), then open UV LED 1, by incident optical 2 guiding absorption cells 3, ultraviolet light is penetrated by injecting window 304 entering absorption cells 3 by the collimating apparatus 202 of incident optical 2 other ends ultraviolet light after collimating apparatus 201 becomes directional light at this moment;
(7), the SO of ultraviolet light in absorption cell 3
2Aspiration receive the decay back by penetrate window 302 through collimating apparatus 401 by outgoing optical fiber 4 direct light spectrometers 5, ultraviolet light is injected spectrometer 5 by the collimating apparatus 402 of outgoing optical fiber 4 other ends;
(8), ultraviolet light through shining behind collimation, focal length, the diffraction on the linear CCD array 501, regulates the ultraviolet light of UV LED 1 emission 290-320nm wavelength in spectrometer 5 inside, and the absorption cross section that writes down each wavelength is as SO
2The data of calibrating gas are given computing machine 6, discharge SO from the gas outlet 303 of absorption cell 3
2Gas;
(9), computing machine 6 passes through SO
2The data of calibrating gas and blank correlation data calculate the peaked emission wavelength 300.09nm of absorption cross section, and this wavelength is called peak wavelength, near the emission wavelength 301.47nm in minimal absorption cross section, and this wavelength is called the peak valley wavelength;
Two, carry out SO
2The detection of gas concentration:
(10), elder generation charges into SO to be measured from the air intake opening 301 of absorption cell 3 to absorption cell 3
2Gas;
(11), then open UV LED 1, by incident optical 2 guiding absorption cells 3, ultraviolet light is penetrated by injecting window 304 entering absorption cells 3 by the collimating apparatus 202 of incident optical 2 other ends ultraviolet light after collimating apparatus 201 becomes directional light at this moment;
(12), the SO of ultraviolet light in absorption cell 3
2Aspiration receive the decay back by penetrate window 302 through collimating apparatus 401 by outgoing optical fiber 4 direct light spectrometers 5, ultraviolet light is injected spectrometer 5 by the collimating apparatus 402 of outgoing optical fiber 4 other ends;
(13), ultraviolet light through shining behind collimation, focal length, the diffraction on the ultraviolet photo-sensitive cell, regulates the emission wavelength of UV LED in spectrometer inside, and ultraviolet light SO to be measured in absorption cell of detection peak wavelength 300.09nm and peak valley wavelength 301.47nm
2The peak wavelength after the gas absorption decay and the absorption cross section of peak valley wavelength are counted σ (λ
1) and σ (λ
2) and be transferred to computing machine;
(14), the computing machine that is connected with spectrometer calculates SO to be measured through following formula
2The concentration of gas:
Wherein, C is a sulfur dioxide concentration; R is constant=8.314J/molK; T is a kelvin degree; P is a pressure, and unit is a handkerchief; N
ABe avogadros constant=6.022*10
23Mol
-1λ
1And λ
2Be respectively peak wavelength 300.09nm and peak valley wavelength 301.47nm; σ (λ
1) and σ (λ
2) be respectively the absorption cross section of peak wavelength and peak valley wavelength; L is a light path.
Fig. 2 utilizes the present invention to detect the measurement data tabulation of variable concentrations sulphuric dioxide, can find out that the present invention has good rectilinearity, and rectilinearity is 0.999.
More than be that the flue gas analyser that the present invention is based on UV LED is set forth with its course of work; Be used for helping to understand the present invention; But embodiment of the present invention is not restricted to the described embodiments; Any change that does not deviate under the principle of the invention to be done, modification, substitute, combination, simplify, all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. sulfur dioxide analyzing method based on UV LED is characterized in that analytical procedure is:
One, detects SO
2The peak wavelength of gas and peak valley wavelength:
(1), elder generation charges into N from the air intake opening of absorption cell to absorption cell
2Gas;
(2), then open UV LED, by incident optical guiding absorption cell, ultraviolet light is penetrated by injecting window entering absorption cell by the collimating apparatus of the incident optical other end ultraviolet light after collimating apparatus becomes directional light at this moment;
(3), the N of ultraviolet light in absorption cell
2Aspiration receive the back by penetrate window through collimating apparatus by outgoing optical fiber direct light spectrometer, ultraviolet light is injected spectrometer by the collimating apparatus of the outgoing optical fiber other end;
(4), ultraviolet light in spectrometer inside through shining behind collimation, focal length, the diffraction on the ultraviolet photo-sensitive cell; Regulate the ultraviolet light of the emission 290-320nm wavelength of UV LED; And the absorption cross section that writes down each wavelength gives computing machine as blank correlation data, discharges N from the gas outlet of absorption cell
2Gas;
(5), charge into the SO of 500ppm again to absorption cell from the air intake opening of absorption cell
2Calibrating gas;
(6), then open UV LED, by incident optical guiding absorption cell, ultraviolet light is penetrated by injecting window entering absorption cell by the collimating apparatus of the incident optical other end ultraviolet light after collimating apparatus becomes directional light at this moment;
(7), the SO of ultraviolet light in absorption cell
2Gas absorption decay back by penetrate window through collimating apparatus by outgoing optical fiber direct light spectrometer, ultraviolet light is injected spectrometer by the collimating apparatus of the outgoing optical fiber other end;
(8), ultraviolet light through shining behind collimation, focal length, the diffraction on the ultraviolet photo-sensitive cell, regulates the ultraviolet light of the emission 290-320nm wavelength of UV LED in spectrometer inside, and writes down the absorption cross section of each wavelength, as SO
2The data of calibrating gas are given computing machine, discharge SO from the gas outlet of absorption cell
2Gas;
(9), computing machine passes through SO
2The data of calibrating gas and blank correlation data calculate the peaked emission wavelength of absorption cross section and count λ
1, this wavelength is called peak wavelength, and near the emission wavelength in minimal absorption cross section is counted λ
2, this wavelength is called the peak valley wavelength;
Two, carry out SO
2The detection of gas concentration:
(10), elder generation charges into SO to be measured from the air intake opening of absorption cell to absorption cell
2Gas;
(11), then open UV LED, by incident optical guiding absorption cell, ultraviolet light is penetrated by injecting window entering absorption cell by the collimating apparatus of the incident optical other end ultraviolet light after collimating apparatus becomes directional light at this moment;
(12), the SO of ultraviolet light in absorption cell
2Gas absorption decay back by penetrate window through collimating apparatus by outgoing optical fiber direct light spectrometer, ultraviolet light is injected spectrometer by the collimating apparatus of the outgoing optical fiber other end;
(13), ultraviolet light through shining behind collimation, focal length, the diffraction on the ultraviolet photo-sensitive cell, regulates the emission wavelength of UV LED in spectrometer inside, and detection peak wavelength X
1With the peak valley wavelength X
2Ultraviolet light SO to be measured in absorption cell
2The peak wavelength after the gas absorption decay and the absorption cross section of peak valley wavelength are counted σ (λ
1) and σ (λ
2) and be transferred to computing machine;
(14), the computing machine that is connected with spectrometer calculates SO to be measured through following formula
2The concentration of gas:
Wherein, C is a sulfur dioxide concentration; R is constant=8.314J/molK; T is a kelvin degree; P (λ
1) and P (λ
2) be respectively the light intensity of peak wavelength and peak valley wavelength; P is a pressure, and unit is a handkerchief; N
ABe avogadros constant=6.022*10
23Mol
-1λ
1And λ
2Be respectively peak wavelength and peak valley wavelength; σ (λ
1) and σ (λ
2) be respectively the absorption cross section of peak wavelength and peak valley wavelength; L is a light path.
2. the sulfur dioxide analyzing method based on UV LED according to claim 1 is characterized in that: the spectral range of said optical fiber is 200-1100nm, and core diameter is 900um.
3. the flue gas analyser based on UV LED according to claim 1 is characterized in that: the measurement range of said spectrometer is 200-340nm, and grating indentation density is 2400mm
-1, resolution is 0.29nm.
4. the sulfur dioxide analyzing method based on UV LED according to claim 1 is characterized in that: said ultraviolet photo-sensitive cell is the linear CCD array, totally 3648 pixels, and each pixel is that 8um is wide, 200um is long.
5. the sulfur dioxide analyzing method based on UV LED according to claim 1; It is characterized in that: the window of injecting of said absorption cell is a quartz material with penetrating window; Absorption cell side diameter is 22mm, and length is 102.5mm, and logical optical range is 200-2700nm.
6. the sulfur dioxide analyzing method based on UV LED according to claim 1 is characterized in that: saidly inject window and penetrate angle between the ultraviolet light path of window and transmission that all to be 75 degree to 85 degree or 95 degree spend to 105.
7. the sulfur dioxide analyzing method based on UV LED according to claim 1 is characterized in that: said peak wavelength λ
1Be 300.09nm, the peak valley wavelength X
2Be 301.47nm.
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| CN2010102344462A CN101907563B (en) | 2010-07-21 | 2010-07-21 | Sulfur dioxide analyzer based on ultraviolet light-emitting diode and analysis method |
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| CN110658145B (en) * | 2019-09-26 | 2021-08-17 | 中国科学院武汉物理与数学研究所 | Device and method for UV imaging calibration of ship exhaust sulfur dioxide based on spectroscopy |
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Effective date of registration: 20220506 Address after: 528000 No.8, Huishang Road, Jiangcun village, Leliu street, Shunde District, Foshan City, Guangdong Province Patentee after: Guangdong Yingfeng Technology Co.,Ltd. Address before: 518000 No. 301, block B, R & D building, Tsinghua hi tech Industrial Park, Nanshan District, Guangdong, Shenzhen Patentee before: UNIVERSTAR SCIENCE & TECHNOLOGY (SHENZHEN) Co.,Ltd. |