CN106053428B - A kind of petrochemical industry based on the enhancing of F-P optical signallings carries the sensing device of hydrogen pipeline gas content on-line measurement - Google Patents
A kind of petrochemical industry based on the enhancing of F-P optical signallings carries the sensing device of hydrogen pipeline gas content on-line measurement Download PDFInfo
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- 239000007789 gas Substances 0.000 title claims abstract description 70
- 230000003287 optical effect Effects 0.000 title claims abstract description 42
- 239000001257 hydrogen Substances 0.000 title claims abstract description 29
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 29
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 title claims abstract description 22
- 230000002708 enhancing effect Effects 0.000 title abstract 2
- 230000011664 signaling Effects 0.000 title 1
- 238000001069 Raman spectroscopy Methods 0.000 claims abstract description 60
- 239000000523 sample Substances 0.000 claims description 41
- 238000002310 reflectometry Methods 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 9
- 239000005357 flat glass Substances 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000005284 excitation Effects 0.000 abstract 1
- 238000005070 sampling Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 16
- 210000004027 cell Anatomy 0.000 description 14
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 11
- 239000005977 Ethylene Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 11
- 238000005984 hydrogenation reaction Methods 0.000 description 8
- 238000001237 Raman spectrum Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000002360 explosive Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 238000000862 absorption spectrum Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004517 catalytic hydrocracking Methods 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 210000002230 centromere Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
- G01N21/658—Raman scattering enhancement Raman, e.g. surface plasmons
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Abstract
The present invention provides a kind of optical enhancement cavity and sensing device carrying hydrogen pipeline gas content on-line measurement for petrochemical industry, including sample cell, and sample cell is equipped with air inlet and gas outlet；The left and right ends of sample cell are respectively equipped with the first speculum and the second speculum；Wherein the first speculum and the second speculum include spherical surface, and the middle part of spherical surface is disk；First speculum is equipped with the laser entrance for incident laser；The lateral of sample cell is equipped with the window slide that light transmission is connect with Raman signal collector unit.Optical enhancement cavity using special speculum group at, constitute the double F-P chambers structure of spherical surface and disk, greatly strengthen excitation light power, this is that other devices are not achieved, the enhancing of the several orders of magnitude of Raman signal light is realized, to have very high sensitivity and accuracy, while Full-optical is realized in pipelines and petrochemical pipelines and measuring operation, essential safety, and On-line sampling system may be implemented.
Description
Technical Field
The invention relates to the field of petrochemical gas content measurement, in particular to a sensing device for online measurement of petrochemical hydrogen-carrying pipeline gas content based on F-P optical signal enhancement.
Background
Carrying hydrogenThe process is widely applied in the petrochemical industry, and under the conditions of proper temperature, hydrogen concentration, air pressure and the like, chemical products such as hydrocarbons or alcohols with certain molecular weight are generated. The ethylene hydrogen is used in a hydrocracking device, a wax oil hydrogenation device and other devices, if the purity of the ethylene hydrogen is reduced, the system hydrogen partial pressure of the hydrogenation device is reduced, the hydrogenation reaction is not facilitated, and the product quality is influenced. In order to maintain a sufficient hydrogen partial pressure, the hydrogenation apparatus also needs to discharge a gas having a low hydrogen concentration, increasing the consumption of hydrogen. Ethylene hydrogen used by many enterprises is purchased externally, and ethylene hydrogen containing impurity components increases the cost of the raw materials. If the ethylene hydrogen purity is reduced (methane, CO)2The impurity content rises), the following disadvantages will result:
(1) the increase in impurity content, in turn, relatively decreases the hydrogen content, which results in an increase in gas cost.
(2) Most of the hydrogen produced by the ethylene hydrogen and hydrogen production device of the refinery is used for the hydrocracking device and the wax oil hydrogenation device, and the rest hydrogen is used for the old hydrogenation device of the refinery. If the hydrogen purity of the ethylene is reduced, the system hydrogen partial pressure of the hydrogenation device is reduced, so that the hydrogenation reaction is unfavorable, and the product quality is influenced.
(3) CO and CO2Under the condition of hydrogen, methanation reaction can occur, a large amount of heat is released in a catalyst bed layer, so that the bed layer is over-heated, and the product quality is influenced.
Therefore, a safe ethylene hydrogen purity monitoring technology is urgently needed in the petrochemical industry.
Currently, there are three main methods for measuring gas purity: electrochemical, electrical and optical; however, hydrogen and the like are flammable and explosive gases, and the danger of using an electric sensor is high, so that the sensors currently used in the petrochemical industry are mainly optical sensors. Gas chromatographic analysis is a gas optical detection method for separating and measuring multicomponent mixture, based on that different substances have different distribution coefficients in two phases moving relatively, when the substances move along with the mobile phase, the substances are repeatedly distributed between the two phases, so that the components with the original distribution coefficients only slightly different are separated and sequentially sent to a detector for measurement, and the purpose of separating and analyzing the components of each gas is further achieved. The separated gases flow into gas detectors with different characteristics in sequence along with the carrier gas to carry out data acquisition and comprehensive analysis. The method needs specific gas or liquid as a flowing carrier, carries the sample into a chromatographic column for analysis, increases the complexity of the system, improves the operation cost, and only adopts an intermittent analysis mode.
The infrared detection technology is another gas monitoring means widely applied, the infrared absorption spectrum reflects the concentration of a substance by utilizing the absorption intensity of the substance to a certain wavelength, and the methane gas detection technology based on the infrared absorption spectrum method is developed well, but the technology has great difficulty in detecting mixed gas.
Compared with the optical detection technology, the Raman spectrum technology can realize real-time and accurate detection of the material components. The Raman scattering spectrum system has simple device, does not require pretreatment on a sample, has no damage and high analysis speed, and can meet the field real-time on-site detection. In gas detection and analysis, a Raman spectrum technology can be used for simultaneously exciting Raman scattering spectra of a plurality of gas components by using laser with single frequency, and in a gas Raman detection system, because gas molecules have no selectivity on the wavelength of exciting light, the Raman spectrum technology can be applied to detection of a plurality of gas components, and the infrared spectrum cannot be realized at this point. It can analyze 8 components simultaneously, such as common H2、CO、CO2、O2、N2、CH4、CxHy、H2And O. The detection range is from tens of PPMs to 100%, and the response time is extremely short. Therefore, raman spectroscopy is a powerful means for online monitoring of the purity and impurity content of ethylene hydrogen.
The principle of detection by the raman technology is that laser with a certain frequency is irradiated on the surface of an object to cause raman scattering of gas molecules, and each gas molecule generates a specific raman shift. Therefore, when laser with a certain frequency irradiates the mixed gas, each gas molecule can generate a specific Raman shift spectral line, the components of the mixed gas can be known by analyzing the Raman spectral lines, and meanwhile, the concentration content of the gas to be detected can be obtained only by analyzing the spectral lines corresponding to the gas molecules to be detected because the intensity of the spectral lines is in direct proportion to the gas concentration. The main problem of measuring gas content by using the raman technology at present is that the raman scattering cross section of a gas molecule is smaller than that of the absorption cross section by several orders of magnitude, and relatively speaking, the absorption spectrum of the gas molecule is more easily obtained, and the detection of the raman spectrum is more difficult. Considering that the raman intensity is proportional to the excited laser power, increasing the excited laser power is an effective means to solve the problem, and for gases, the methods of surface enhancement and resonance enhancement are not suitable, and at present, the method of cavity enhancement is generally adopted at home and abroad.
CN1584555A discloses a petroleum product quality rapid determination appearance based on low resolution raman spectroscopy, and the device is mainly used for detecting petroleum product quality, and its characteristics are with low costs, small, portable, but its resolution is not high, does not design raman scattering reinforcing system, is not suitable for petrochemical industry gas detection.
CN1645106A discloses a raman technology-based analysis device for dissolved gas in power transformer oil, which adopts a near-concentric cavity optical system as a raman scattering enhancement device, and improves sensitivity compared with other devices, but the device fixes a laser, a sample cell and an optical system on a mounting plate, inevitably uses a power supply, is not beneficial to being installed on the site of flammable and explosive gas pipelines such as ethylene and hydrogen in petrochemical industry, and the enhancement effect of the optical system is limited.
At present, the measurement system applied to the Raman online monitoring of flammable and explosive gases such as ethylene and hydrogen in the petrochemical industry is rare at home, the problem of difficulty in Raman spectrum detection of gas molecules is solved, equipment which can cause potential safety hazards such as electricity and the like is guaranteed to be not used in a system device installed on the site, and meanwhile the problem of the sealing property of a sample cell is also considered.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the sensing device for online measurement of the gas content in the petrochemical hydrogen-carrying pipeline based on F-P optical signal enhancement realizes the enhancement of Raman signal light by several orders of magnitude, thereby having high sensitivity and accuracy, realizing full-light type measurement operation on the petrochemical pipeline, being safe in nature and realizing online real-time measurement.
The technical scheme adopted by the invention for solving the technical problems is as follows: an optical enhancement cavity for online measurement of gas content in a petrochemical hydrogen-carrying pipeline is characterized in that: the device comprises a sample cell, wherein the sample cell is provided with a gas inlet and a gas outlet which are used for being connected with an industrial pipeline filled with gas to be detected;
the left end and the right end of the sample cell are respectively provided with a first reflecting mirror and a second reflecting mirror; the first reflector and the second reflector both comprise spherical surfaces with focal lengths of F, and the middle parts of the spherical surfaces are circular planes with diameters of l, so that the two spherical surfaces form a first F-P oscillation cavity, and the two circular planes form a second F-P oscillation cavity; the first reflector is provided with a laser inlet for incidence of laser;
and a light-transmitting window glass slide connected with the Raman signal collecting unit is arranged laterally of the sample cell.
According to the scheme, the distance d between the first reflecting mirror and the second reflecting mirror is 4 f-delta d, and delta d ranges from 0.2mm to 0.4 mm.
According to the scheme, the diameter l of the circular plane ranges from 3mm to 4 mm.
According to the scheme, the first reflecting mirror and the second reflecting mirror are plated with high-reflection dielectric films with the reflectivity of more than 99.5%.
According to the scheme, the flange plate and the sealing ring are arranged between the air inlet and the industrial pipeline and between the air outlet and the industrial pipeline.
The utility model provides a petrochemical industry carries hydrogen pipeline gas content on-line measuring's sensing device based on F-P optical signal reinforcing which characterized in that: the Raman signal acquisition device comprises an optical enhancement cavity, a laser incidence unit, a Raman signal collection unit, a signal demodulation unit and a signal processing unit; wherein,
laser emitted by the laser enters the sample cell from a laser inlet on the first reflecting mirror through the laser incidence unit;
the Raman signal collecting unit comprises a broadband reflecting mirror arranged on one side of the sample cell and a Raman probe arranged on the other side of the sample cell; the Raman light is received by the Raman probe through the window glass slide, transmitted to the signal demodulation unit, demodulated into an electric signal and then transmitted to the signal processing unit.
According to the device, the laser incidence unit comprises an optical isolator, a collimating lens group, a plane high-reflection mirror with the reflectivity of more than 99.5 percent and an angle adjusting frame for adjusting the angle of the plane high-reflection mirror, wherein the optical isolator, the collimating lens group and the plane high-reflection mirror are sequentially arranged along the laser propagation direction.
According to the device, the Raman probe comprises a first focusing lens, an optical filter, a notch optical filter and a second focusing lens which are sequentially arranged along the propagation direction of the Raman light.
According to the device, the broadband reflector is plated with a high-reflectivity broadband dielectric film with the reflectivity of more than 95%.
The invention has the beneficial effects that:
1. the optical enhancement cavity is composed of special reflectors, forms a spherical and circular plane double F-P cavity structure, greatly enhances the exciting light power, cannot be achieved by other devices, and realizes the enhancement of Raman signal light by several orders of magnitude, thereby having high sensitivity and accuracy, simultaneously realizing full-light type measurement operation on a petrochemical pipeline, being intrinsically safe, and realizing on-line real-time measurement.
2. The laser incidence unit can realize the adjustment of the laser incidence angle and the beam quality.
3. The Raman collection unit adopts a spherical reflector with a large caliber and is plated with a high-reflection dielectric film, so that the large-range collection of Raman signal light is ensured, and meanwhile, the collection angle is improved and the maximum collection of the Raman signal light is realized by adopting a centromere design.
4. The gas inlet and the gas outlet are connected with the industrial pipeline by adopting flanges and sealing gaskets, so that the real consistency of the measured gas and the industrial gas is ensured, and the real online monitoring is realized. The whole device adopts a laser remote input and Raman signal remote output mode to prevent an electric device from being close to gas pipelines such as inflammable and explosive gases, is safe and reliable in detection, and can be used for online monitoring of inflammable and explosive gases.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a laser incident unit.
Fig. 3 is a partial structural diagram of an embodiment of the invention.
In the figure: 1. the Raman spectrum analyzer comprises a laser incidence unit, a laser device, a sample cell, a laser device, a signal demodulation module, a signal processing unit, a light isolator, an air outlet, a Raman signal collection unit, a laser device, a signal demodulation module, a signal processing unit, a light isolator, a collimating lens group, a plane high-reflection mirror, a light angle adjusting frame, an angle adjusting frame, a first reflecting mirror, a laser inlet, a laser light inlet, a second reflecting mirror, a light isolator, a collimating lens group, a light angle adjusting frame, a first reflecting mirror, a light angle adjusting frame, a broadband reflecting mirror, a first focusing lens, a light filter.
Detailed Description
The invention is further illustrated by the following specific examples and figures.
The invention provides an optical enhancement cavity for online measurement of hydrogen and impurity contents in petrochemical hydrogen-carrying pipelines, which comprises a sample pool 2, wherein the sample pool 2 is provided with an air inlet 2-1 and an air outlet 2-2 which are connected with an industrial pipeline filled with gas to be measured, as shown in figures 1 and 3; the left end and the right end of the sample cell 2 are respectively provided with a first reflecting mirror 11 and a second reflecting mirror 12; the first reflector 11 and the second reflector 12 both comprise spherical surfaces with focal length F, and the middle part of the spherical surface is a circular plane with length l, so that the two spherical surfaces form a first F-P oscillation cavity and the two circular planes form a second F-P oscillation cavity; the first reflector is provided with a laser inlet 11-1 for incidence of laser; the side of the sample pool 2 is provided with a light-transmitting window glass sheet connected with the Raman signal collecting unit 3.
In this embodiment, the distance d between the first reflector 11 and the second reflector 12 is 4f- Δ d, and Δ d is in the range of 0.25 mm. The diameter l of the circular plane is about 3.5 mm. The first reflecting mirror 11 and the second reflecting mirror 12 are coated with a high reflective dielectric film having a reflectivity of 99.5% or more.
Preferably, a flange plate and a sealing ring are arranged between the air inlet 2-1 and the air outlet 2-2 and the industrial pipeline. In the embodiment, the gas inlet 2-1 is connected with the measuring side pipe through a flange and a sealing gasket, and the gas outlet 2-2 is connected with the emptying side pipe through a flange and a sealing gasket, so that the consistency of the measuring gas and the petrochemical pipeline gas and the sealing performance of the device are ensured.
A sensing device for online measurement of hydrogen and impurity contents in petrochemical hydrogen-carrying pipelines is shown in figures 1 and 3, and comprises an optical enhancement cavity, a laser 4, a laser incidence unit 1, a Raman signal collection unit 3, a signal demodulation unit 5 and a signal processing unit 6; wherein, the laser emitted by the laser 4 enters the sample cell 2 from the laser inlet 11-1 on the first reflector 11 through the laser incidence unit 1; the Raman signal collecting unit 3 comprises a broadband reflecting mirror 13 arranged on one side of the sample cell 2 and a Raman probe arranged on the other side of the sample cell 2; the Raman light is received by the Raman probe through the window glass slide, transmitted to the signal demodulation unit 5, demodulated into an electric signal and then transmitted to the signal processing unit 6.
As shown in fig. 2, the laser incidence unit 1 includes an optical isolator 7, a collimating lens group 8, a plane high-reflection mirror 9 with a reflectivity of 99.5% or more, and an angle adjusting bracket 10 for adjusting the angle of the plane high-reflection mirror 9. The installation mode is as follows: the synthetic probe of optical isolator 7 and collimating lens group 8 is installed on angular adjustment frame 10 with plane height reflection mirror 9 together, and angular adjustment frame 10 can be around the fixed point rotation adjust the angle of plane height reflection mirror 9, and laser is incited to the fixed point of plane height reflection mirror 9 after through optical isolator 7 and collimating lens group 8 on, can adjust the exit angle of reflection laser through rotatory plane height reflection mirror 9 and realize the light incident angle and adjust.
Preferably, the raman probe includes a first focusing lens 14, a filter 15, a notch filter 16, and a second focusing lens 17, which are sequentially disposed along the propagation direction of the raman light.
In this embodiment, the broadband reflecting mirror 13 is a large-aperture spherical mirror with a diameter of 70mm, the mirror surface is plated with a high-reflectivity broadband dielectric film, the reflectivity of the raman light to the laser reaches more than 95%, and meanwhile, the raman probe adopts a decentered design, that is, the focal length of the first focusing lens 14 adopts a small focal length of about 7.5mm, so as to ensure that the collecting lens has a sufficiently large collecting angle, thereby ensuring that the stimulated raman signal light can be collected to the maximum extent; the filter 15 and the notch filter 16 are used for filtering background light such as laser light and rayleigh scattered light, and ensuring the signal-to-noise ratio of the received signal.
In this embodiment, the laser incidence unit 1 and the optical enhancement cavity and raman signal collection unit 3 are mounted on a horizontal support, laser emitted from a laser is transmitted to the laser incidence unit 1 through an optical cable, and is emitted into the optical enhancement cavity to excite raman light after beam processing, the raman light is collected by the raman signal collection unit 3 and then enters the optical cable to be transmitted to the signal demodulation module 5, and the signal demodulation module is connected with the signal processing unit 6 through a communication line to perform signal processing. The air inlet 2-1 and the air outlet 2-2 are connected with an industrial pipeline through flanges and sealing gaskets.
The embodiment adopts the long-distance optical cable to transmit the laser and the Raman signal light, realizes the all-optical structure of the detection component, and is safe and reliable in essence.
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.
Claims (8)
1. An optical enhancement cavity for online measurement of gas content in a petrochemical hydrogen-carrying pipeline is characterized in that: the device comprises a sample cell, wherein the sample cell is provided with a gas inlet and a gas outlet which are used for being connected with an industrial pipeline filled with gas to be detected;
the left end and the right end of the sample cell are respectively provided with a first reflecting mirror and a second reflecting mirror; wherein the first reflector and the second reflector each comprise a focal length offThe middle part of the spherical surface has a diameter oflThe two spherical surfaces form a first F-P oscillation cavity, and the two circular surfaces form a second F-P oscillation cavity; first reflectionThe mirror is provided with a laser inlet for incidence of laser; laser emitted by the laser enters the sample cell from a laser inlet on the first reflecting mirror through the laser incidence unit;
and a transparent window glass sheet connected with the Raman signal collecting unit is arranged in the lateral direction of the sample pool, and a broadband reflecting mirror at the bottom of the sample pool is arranged corresponding to the Raman probe at the other side of the sample pool.
2. The optical enhancement chamber for online measurement of gas content in petrochemical hydrogen-carrying pipelines according to claim 1, characterized in that: the distance between the first reflector and the second reflectord=4f-Δd，ΔdIs in the range of 0.2mm to 0.4 mm.
3. The optical enhancement chamber for online measurement of gas content in petrochemical hydrogen-carrying pipelines according to claim 1, characterized in that: diameter of the circular planelIs in the range of 3mm to 4 mm.
4. The optical enhancement chamber for online measurement of gas content in petrochemical hydrogen-carrying pipelines according to claim 1, characterized in that: the first reflector and the second reflector are plated with high-reflection dielectric films with the reflectivity of more than 99.5 percent.
5. The optical enhancement chamber for online measurement of gas content in petrochemical hydrogen-carrying pipelines according to claim 1, characterized in that: and a flange plate and a sealing ring are arranged between the air inlet and the air outlet and the industrial pipeline.
6. The utility model provides a petrochemical industry carries hydrogen pipeline gas content on-line measuring's sensing device based on F-P optical signal reinforcing which characterized in that: it comprises the optical enhancement cavity of any one of claims 1 to 5, further comprising a laser, a laser incidence unit, a Raman signal collection unit, a signal demodulation unit and a signal processing unit; wherein,
laser emitted by the laser enters the sample cell from a laser inlet on the first reflecting mirror through the laser incidence unit;
the Raman signal collecting unit comprises a broadband reflecting mirror arranged on one side of the sample cell and a Raman probe arranged on the other side of the sample cell; the Raman light is received by the Raman probe through the window glass slide, transmitted to the signal demodulation unit, demodulated into an electric signal and then transmitted to the signal processing unit;
the laser incidence unit comprises an optical isolator, a collimating lens group and a plane high-reflection mirror with reflectivity of more than 99.5 percent, which are sequentially arranged along the laser propagation direction, and also comprises an angle adjusting frame for adjusting the angle of the plane high-reflection mirror.
7. The sensing device for online measurement of gas content in petrochemical hydrogen-carrying pipelines based on F-P optical signal enhancement according to claim 6, characterized in that: the Raman probe comprises a first focusing lens, an optical filter, a notch filter and a second focusing lens which are sequentially arranged along the propagation direction of Raman light.
8. The sensing device for online measurement of gas content in petrochemical hydrogen-carrying pipelines based on F-P optical signal enhancement according to claim 6, characterized in that: the broadband reflector is plated with a high-reflectivity broadband dielectric film with the reflectivity of more than 95%.
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| CN106990091B (en) * | 2017-04-13 | 2020-04-28 | 重庆大学 | Frequency locking V-shaped enhancement cavity for enhancing gas Raman spectrum detection signal |
| CN108303376B (en) * | 2017-12-15 | 2020-12-22 | 复旦大学 | Multi-cavity series gas sample cell with built-in reflecting mirror |
| CN108344727B (en) * | 2018-04-27 | 2024-01-30 | 中国石油化工集团有限公司 | Raman signal collection system and method |
| CN108426872A (en) * | 2018-06-13 | 2018-08-21 | 武汉理工大学 | A kind of gas concentration on-line measurement system and its method for Raman scattering optical fiber sensing |
| CN108767641B (en) * | 2018-08-29 | 2024-04-02 | 中山市禾统光电科技有限公司 | Laser pumping light-emitting adjusting system |
| CN109507169A (en) * | 2018-12-29 | 2019-03-22 | 广州玉科仪器有限公司 | Gas analysis system and gas analysis auxiliary device |
| CN109655445B (en) * | 2019-01-22 | 2021-08-24 | 重庆大学 | Multi-section circular multi-pass air chamber for improving gas Raman detection sensitivity |
| DE102019104481A1 (en) | 2019-02-21 | 2020-08-27 | Laser-Laboratorium Göttingen e.V. | Method and device for the identification of volatile substances with resonator-enhanced Raman spectroscopy at reduced pressure |
| CN111426677B (en) * | 2020-04-29 | 2023-09-19 | 中国工程物理研究院核物理与化学研究所 | Raman spectrum multi-site excitation structure and gas analysis method |
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| US4676639A (en) * | 1986-01-22 | 1987-06-30 | Biomaterials International, Inc. | Gas cell for raman scattering analysis by laser means |
| CN104713865B (en) * | 2013-12-13 | 2017-09-29 | 中国科学院大连化学物理研究所 | A kind of deep ultraviolet laser Raman spectrometer |
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| CN104614362B (en) * | 2015-01-22 | 2017-05-10 | 华中科技大学 | Free space gas Raman scattering collecting device |
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