CN103278472B - A kind of Fourier infrared spectrograph and sample gas absorption cell - Google Patents
A kind of Fourier infrared spectrograph and sample gas absorption cell Download PDFInfo
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- CN103278472B CN103278472B CN201310166591.5A CN201310166591A CN103278472B CN 103278472 B CN103278472 B CN 103278472B CN 201310166591 A CN201310166591 A CN 201310166591A CN 103278472 B CN103278472 B CN 103278472B
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Abstract
A kind of Fourier infrared spectrum pick-up unit, comprise the sample gas absorption cell absorbing sample gas, light beam through the sample gas in sample gas absorption cell is produced to the interferometer of interference light signal, interference light signal is transformed into the photoconductive detector of voltage signal, Fourier transform is carried out interferogram to be converted to the computer for controlling of spectrogram to voltage signal, computer for controlling inversion solution calculates the concentration information of sample gas, in described sample gas absorption cell, pH effect eyeglass is set, can light path be increased.The present invention, by increasing pH effect eyeglass in sample gas absorption cell, changes propagation path, increases optical path length, and then improves the Monitoring lower-cut of signal concentration.
Description
Technical field
The present invention relates to infrared spectrum to learn a skill, particularly relate to for Fourier infrared spectrograph and the sample gas absorption cell for Fourier infrared spectrograph.
Background technology
Infrared spectrum belongs to molecular vibration spectrum, by carrying out spectrum elucidation to the spectrum of molecular vibration, can obtain the information of molecular structure.Compared with other analytical instrument, infrared spectrum can detect any gaseous state, liquid state and solid sample, and other analytical instrument limits in this to some extent.Special in organic compound, because often kind of compound all has infrared absorption, especially the infrared spectrum energy of organic compound provides abundant structural information, thus special in organic compound, and infrared spectrum instrument is a kind of considerable structure detection analyzing device.Infra-red sepectrometry, as the useful means of detect analytes matter structure, is mainly used in Qualitative Identification and the quantitative test of various material, and between analyzing molecules and intramolecular interaction, thus can be widely used in chemical analysis field.Infrared spectrum instrument have also been obtained strong development.From lens type color dispersion-type infrared spectrometer the earliest, to grating type dispersion formula infrared spectrometer, then to interfere type infrared spectrometer, along with the fast development of computer technology, there is Fourier infrared spectrograph.Fourier infrared spectrograph can as a representative of interfere type infrared spectrum instrument, and signal to noise ratio (S/N ratio) is higher, and resolution is also higher.Fourier infrared spectrograph also possesses computer disposal function usually, can be applied to various different sample, can easily and effectively for the quality monitoring of sample.
Fourier infrared spectrograph, mainly based on fourier transform infrared spectroscopy ultimate principle, utilizes infrared radiation to enter interferometer, produces interferogram, then carry out Fourier transform to the interferogram measured and obtain infrared radiating light spectrogram after interferometer modulation light splitting.Ftir Spectroscopy, as a kind of spectroscopy technology, can be specifically designed to the infrared absorption of measurement of species, transmit.
When Fourier infrared spectrograph measures the concentration information of gas to be measured, the infrared beam that infrared light supply is launched is through dusty gas absorption of sample pond to be measured, interference light signal is produced after entering interferometer, interference light signal becomes voltage signal after photodetector conversion, the voltage signal that capture card collection produces, and controlled by computing machine, Fourier transform is carried out to the voltage signal received, by Fourier transform, interferogram is converted to spectrogram, inversion solution calculates the concentration information of gas to be measured.Wherein, dusty gas absorption of sample pond to be measured is once be provided with, and the Monitoring lower-cut of the gas concentration signal that can measure just has had restriction.If gas concentration to be measured is beyond the Monitoring lower-cut of the gas concentration signal that can measure, need the Monitoring lower-cut changing the gas concentration signal that can measure, this just needs again to change whole Fourier infrared spectrograph.This measures the rising of cost by causing, more therefore may cannot complete measurement task.
Therefore, need to propose a kind of Fourier infrared spectrograph, there is the Monitoring lower-cut of the gas concentration signal that can expand.
Summary of the invention
For solving problem proposed by the invention, the object of this invention is to provide a kind of sample gas absorption cell for Fourier infrared spectrum pick-up unit, pH effect eyeglass is set in sample gas absorption cell, can light path be increased, improve the concentration signal Monitoring lower-cut of Fourier infrared spectrum device.
Described pH effect eyeglass comprises the principal reflection mirror being arranged on sample gas absorption cell second side and the secondary mirror being arranged on first side relative with principal reflection mirror.
Described pH effect eyeglass also comprises the fine motion adjustment mirror being arranged on first side relative with principal reflection mirror, is positioned at the below of secondary mirror.
Described sample gas absorption cell comprises the entrance window mouth mirror being arranged on sample gas absorption cell first side and the exit window mouth mirror being arranged on sample gas absorption cell second side relative with entrance window mouth mirror, entrance window mouth mirror is used for the incident sample gas absorption cell of incident beam, and exit window mouth mirror is used for outgoing beam outgoing sample gas absorption cell.
Incident beam is parallel with the bottom surface of described sample gas absorption cell with outgoing beam, and the bottom surface of described entrance window mouth mirror and described exit window mouth mirror and described sample gas absorption cell is angled, and incident beam and outgoing beam avoid vertical incidence and vertical exit.
The bottom surface that described principal reflection mirror, secondary mirror and fine motion adjust mirror and sample gas absorption cell is angled.
Described fine motion adjustment mirror can adjust by trace, makes outgoing beam and incident beam keeping parallelism.
The inside plating that the interior surface plating of the seal chamber of described sample gas absorption cell scribbles low-refraction, adsorption coefficient little is coated with material.
It is Teflon material that the plating of described inside is coated with material.
Another object of the present invention is to provide a kind of Fourier infrared spectrum pick-up unit, comprise the sample gas absorption cell absorbing sample gas, light beam through the sample gas in sample gas absorption cell is produced to the interferometer of interference light signal, interference light signal is transformed into the photoconductive detector of voltage signal, Fourier transform is carried out interferogram to be converted to the computer for controlling of spectrogram to voltage signal, computer for controlling inversion solution calculates the concentration information of sample gas, in described sample gas absorption cell, pH effect eyeglass is set, can light path be increased.
The present invention, by increasing pH effect eyeglass in sample gas absorption cell cavity, changes propagation path, reaches the object increasing optical path length, thus improves the concentration signal Monitoring lower-cut of Fourier infrared spectrograph, improves the sensitivity detected.
Accompanying drawing explanation
Fig. 1 is Fourier infrared spectrograph theory of constitution schematic diagram according to an embodiment of the invention;
Fig. 2 is sample gas absorption cell according to an embodiment of the invention.
Embodiment
Fig. 1 is Fourier infrared spectrograph theory of constitution schematic diagram according to an embodiment of the invention.As shown in Figure 1, the infrared beam 101 that infrared light supply is launched passes sample gas absorption cell 103.According to one embodiment of present invention, the infrared beam 101 that infrared light supply is launched passes sample gas absorption cell 103 after collimation.Sample gas absorption cell 103 is provided with the sample gas inlet 102 entered for sample gas and the sample gas outlet 104 of discharging for sample gas.When sample gas enters sample gas absorption cell 103 from sample gas inlet 102, infrared beam is through the sample gas entered in sample gas absorption cell 103.Sample gas discharges sample gas absorption cell 103 by sample gas outlet 104.Infrared beam 101, through after the sample gas in sample gas absorption cell 103, is incident on the first paraboloidal mirror 105.Then interferometer 109 is entered by the first paraboloidal mirror 105 focussing force.The composition structure of interferometer 109 is current industry common type, no longer adds to describe at this.Infrared beam generates interference light signal by interferometer 109.The interference light signal generated is incident on plane mirror 108, through the reflection of plane mirror 108, is radiated on the second parabolic lens 107.Through the focussing force of the second parabolic lens 107, enter photodetector.Photodetector is changed the beam signal entered, coating-forming voltage signal.The voltage signal obtained gather by the capture card of control circuit 110, the voltage signal that computer for controlling 111 pairs of capture cards collect carries out Fourier transform.By Fourier transform, optical interference is converted to the spectrogram that can show on absorption spectrum display terminal 112.To utilize on absorption spectrum display terminal 112 spectrogram of display, inversion solution can calculate the concentration information of the sample gas entering sample gas absorption cell 103, thus the concentration information of gas to be measured can be obtained.
When gas concentration to be measured is beyond the Monitoring lower-cut of the gas concentration signal that can measure, then the concentration information of gas to be measured cannot be measured exactly.In order to expand the Monitoring lower-cut of the gas concentration signal that can measure, the present invention is by improving sample gas absorption cell, and achieving light path increases, thus improves the Monitoring lower-cut of concentration information, enhances the sensitivity that concentration signal detects.Sample gas absorption cell is arranged for sealing, and steam can be avoided to disturb.According to one embodiment of present invention, see accompanying drawing 2, sample gas absorption cell comprises seal chamber 8, and sample gas inlet 6 and sample gas outlet 7 are separately positioned on seal chamber 8 top, is respectively used to sample gas and enters seal chamber 8 and sample gas discharge seal chamber 8.Entrance window mouth mirror is contained in the first side of seal chamber 8, according to one embodiment of the invention, entrance window mouth mirror 4 is arranged on seal chamber 8 by first window gland 3, and first window gland 3 tightened by gland screw 2, is pressed on first window gland 3 by entrance window mouth mirror 4.One O type circle 5 is arranged between entrance window mouth mirror 4 and first window gland 3, can strengthen sealing effect.Be understandable that, entrance window mouth mirror 4 also can be arranged on seal chamber 8 by alternate manner.Principal reflection mirror 9 is arranged on the second side relative with first side at entrance window mouth mirror 4 place on seal chamber 8.Secondary mirror 21 is arranged on the first side of seal chamber 8, is positioned at the below of entrance window mouth mirror 4.Exit window mouth mirror 11 is arranged on the second side with principal reflection mirror 9 same side on seal chamber 8, and is positioned at the below of principal reflection mirror 9.According to one embodiment of present invention, exit window mouth mirror 11 is arranged on seal chamber 8 by Second Window gland 12.2nd O type circle 10 is arranged between exit window mouth mirror 11 and Second Window gland 12, can strengthen sealing effect.Be understandable that, exit window mouth mirror 11 also can be arranged on seal chamber 8 by alternate manner.Fine motion adjustment mirror 18 is arranged on the first side with entrance window mouth mirror 4 and secondary mirror 21 same side, is positioned at the below of secondary mirror 21.
According to one embodiment of present invention, sample gas absorption cell 103 also comprises fine motion adjustment mirror 18.Described fine motion adjustment mirror is arranged on the first side of seal chamber 8, is in same side, and is positioned at the below of secondary mirror 21 with entrance window mouth mirror 4 and secondary mirror 21.As shown in Figure 2, fine motion adjustment mirror 18 is arranged on bearing 17, and index glass trim ring 19 is arranged between fine motion adjustment mirror 18 and bearing 17, increases sealing and tight effect.Index glass adjustment bolt 16 coordinates index glass gland 20, bearing 17 and fine motion adjustment mirror 18 is arranged on the first side of seal chamber 8.
The both sides arranged outside of seal chamber 8 first fixed orifice 14 and the second fixed orifice 15, can utilize bolt etc. to be fixedly mounted by sample gas absorption cell.
The inside plating that the interior surface plating of seal chamber 8 scribbles low-refraction, adsorption coefficient little is coated with material 22, according to one embodiment of present invention, it is Teflon material that the plating of described inside is coated with material, inner plating is coated with material 22 makes the light beam getting to seal chamber internal side wall no longer be coupled to main beam, and does not adsorb sample gas.
Incident beam 1 enters sample gas absorption cell 103 by entrance window mouth mirror 4, directive principal reflection mirror 9.Through the reflection of principal reflection mirror 9, light beam is penetrated in secondary mirror 21.Through the reflection of secondary mirror 21, light beam is penetrated again on principal reflection mirror 9.Second time through principal reflection mirror 9 reflects, and light beam is penetrated on fine motion adjustment mirror 18.Through the reflection of fine motion adjustment mirror 18, light beam, by exit window mouth mirror 11, penetrates from sample gas absorption cell 103, forms outgoing beam 13.By the reflection of fine motion adjustment mirror 18, outgoing beam 13 keeping parallelism relative to incident beam 1.
By increasing pH effect eyeglass in the seal chamber of sample gas absorption cell, according to one embodiment of present invention, comprise principal reflection mirror 9, secondary mirror 21 and fine motion adjustment mirror 18, the travel path of light beam in sample gas absorption cell 103 creates change, reach the object increasing optical path length, the Monitoring lower-cut of Fourier infrared spectrograph concentration signal can be improved.
According to one embodiment of present invention, incident beam 1 is parallel with outgoing beam 13, and incident beam 1 is parallel relative to the bottom surface of the seal chamber 8 of sample gas absorption cell 103 with outgoing beam 13.As shown in Figure 2, entrance window mouth mirror 4 is angled with the bottom surface of exit window mouth mirror 11 opposing seal cavity body.First side of seal chamber 8 and the second side also can be angled with bottom surface.Because incident beam 1 is parallel relative to the bottom surface of seal chamber 8 with outgoing beam 13, and entrance window mouth mirror 4 is angled with the bottom surface of exit window mouth mirror 11 opposing seal cavity body, make incident beam 1 entrance window mouth mirror 4 relative to outgoing beam 13 and exit window mouth mirror 11 out of plumb, namely realize out of plumb incidence, outgoing, avoid mirror-reflection to form interference fringe interference.Principal reflection mirror 9 and secondary mirror 21 angled with seal chamber 8, and fine motion adjustment mirror 18 is also angled with seal chamber 8, incident beam 1 can be kept so parallel with outgoing beam 13, incident beam 1 and outgoing beam 13 are respectively from the first side and second side of seal chamber 8, namely sample gas absorption cell 103 two ends, incident sample gas absorption cell 103 and outgoing sample gas absorption cell 103.Index glass adjustment bolt 16 can be adjusted pine or tighten, and fine can adjust the position of fine motion adjustment mirror 18, make outgoing beam parallel relative to the bottom surface of the seal chamber 8 of sample gas absorption cell 103, can avoid vertical exit with this.
According to above, sample gas enters sample gas absorption cell by sample gas inlet, and leaves absorption of sample pond from the outlet of sample gas.Infrared beam light source, through sample gas absorption cell, enters interferometer, and generate interference light signal in interferometer.Interference light signal becomes the collected card of voltage signal and gathered after photodetector conversion, and interferogram is converted to spectrogram by Fourier transform by computer for controlling, and inversion solution calculates the concentration information of gas to be measured.Here, sample gas absorption cell can increase optical path length, thus can be described as extended range model sample gas absorption cell.
Extended range model sample gas absorption cell of the present invention is according to Beer – Lambert law, and namely the concentration of target components is amassed with optical path length and equaled peak absorbance area ratio.Usually, the absorption of sample gas cell of Fourier infrared spectrograph adopts direct-injection type to penetrate, and namely light path does not do any conversion, directly through gas cell.Absorption of sample gas cell of the present invention as shown in Figure 2, by increasing pH effect eyeglass in sealing gas cell cavity body, changes propagation path, to reach the object increasing optical path length L, and then improves the sensitivity of signal Concentration Testing.
According to one embodiment of present invention, for avoiding steam to disturb, Fourier infrared spectrograph adopts sealed construction design, the theory of constitution schematic diagram of Fig. 1 Fourier infrared spectrograph.When adopting Fourier infrared spectrograph of the present invention to work, first the infrared beam of infrared light supply transmitting is after collimation, through sample gas absorption cell, converge in interferometric cavity after paraboloidal mirror focuses on, interference light again through paraboloidal mirror assemble laggard enter photodetector, enter capture card after carrying out opto-electronic conversion by photodetector, the interferogram collected is sent to control and anacom.Interferogram is converted to spectrum by Fourier transform by computing machine, obtains the absorption spectrum in whole absorption of sample pond thus, calculates by retrieving concentration the concentration information that sample gas is also gas to be measured.
Test findings and analysis:
Extended range model sample gas absorption cell of the present invention and the sample gas absorption cell before improving are applied to same Fourier infrared spectrograph, utilize 15 kinds of gases to carry out contrast test.Test findings can see table 1.Test findings shows: the Monitoring lower-cut of Fourier infrared spectrograph is improved about 5 times by extended range model sample gas absorption cell.
Table 1 journey type sample gas absorption cell absorption cell contrast test result front with improvement
。
Claims (7)
1. the sample gas absorption cell for Fourier infrared spectrum pick-up unit, it is characterized in that: being included in sample gas absorption cell to arrange increases light path to improve the pH effect eyeglass of the concentration signal Monitoring lower-cut of Fourier infrared spectrum device, described pH effect eyeglass comprises principal reflection mirror, secondary mirror and fine motion adjustment mirror, described principal reflection mirror is arranged on sample gas absorption cell second side, secondary mirror is arranged on first side relative with principal reflection mirror, and fine motion adjustment mirror is arranged on the below of the secondary mirror of described first side; Also comprise the entrance window mouth mirror being arranged on sample gas absorption cell first side and the exit window mouth mirror being arranged on sample gas absorption cell second side relative with entrance window mouth mirror, entrance window mouth mirror is used for the incident sample gas absorption cell of incident beam, and exit window mouth mirror is used for outgoing beam outgoing sample gas absorption cell.
2. sample gas absorption cell according to claim 1, it is characterized in that, incident beam is parallel with the bottom surface of sample gas absorption cell with outgoing beam, the bottom surface of entrance window mouth mirror and exit window mouth mirror and sample gas absorption cell is angled, and incident beam and outgoing beam avoid vertical incidence and vertical exit.
3. sample gas absorption cell according to claim 2, it is characterized in that described pH effect eyeglass comprises principal reflection mirror, secondary mirror and fine motion adjustment mirror, the bottom surface that principal reflection mirror, secondary mirror and fine motion adjust mirror and sample gas absorption cell is angled.
4. sample gas absorption cell according to claim 1, is characterized in that, the fine motion adjustment mirror in described pH effect eyeglass can adjust by trace, makes outgoing beam and incident beam keeping parallelism.
5. sample gas absorption cell according to claim 1, is characterized in that, the plating of the interior surface of the seal chamber of described sample gas absorption cell scribbles low-refraction, inside plating that adsorption coefficient is little is coated with material.
6. sample gas absorption cell according to claim 5, is characterized in that, it is Teflon material that the plating of described inside is coated with material.
7. one kind adopts the Fourier infrared spectrum pick-up unit of sample gas absorption cell described in claim 1, comprise the sample gas absorption cell absorbing sample gas, light beam through the sample gas in sample gas absorption cell is produced to the interferometer of interference light signal, interference light signal is transformed into the photoconductive detector of voltage signal, Fourier transform is carried out interferogram to be converted to the computer for controlling of spectrogram to voltage signal, computer for controlling inversion solution calculates the concentration information of sample gas, in described sample gas absorption cell, pH effect eyeglass is set, light path can be increased.
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| CN106018276A (en) * | 2016-06-30 | 2016-10-12 | 杭州泽天科技有限公司 | Optical absorption cell |
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| CN107870148B (en) * | 2017-10-13 | 2020-01-14 | 中国科学院上海光学精密机械研究所 | Compact long-optical-path high-sealing-degree gas absorption pool for space environment |
| KR102662656B1 (en) * | 2018-03-12 | 2024-05-03 | 칸토 덴카 코교 가부시키가이샤 | Gas analysis methods and devices |
| CN108844918A (en) * | 2018-06-08 | 2018-11-20 | 哈尔滨工程大学 | A kind of TDLAS measurement gas cell device for simulating internal combustion engine situation |
| CN109470643A (en) * | 2018-11-21 | 2019-03-15 | 中国科学院上海技术物理研究所 | A kind of infrared spectroscopy scaler based on gas sorption features spectrum |
| CN113390812B (en) * | 2021-06-01 | 2022-07-12 | 天津同阳科技发展有限公司 | Fourier transform infrared spectrometer and gas concentration detection method |
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