CN204128961U - Grease contamination monitoring device in a kind of superpower laser - Google Patents
Grease contamination monitoring device in a kind of superpower laser Download PDFInfo
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- CN204128961U CN204128961U CN201420652009.6U CN201420652009U CN204128961U CN 204128961 U CN204128961 U CN 204128961U CN 201420652009 U CN201420652009 U CN 201420652009U CN 204128961 U CN204128961 U CN 204128961U
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Abstract
The utility model provides the grease contamination monitoring device in a kind of superpower laser, generating device of laser in described device is by 2 × 2 coupling mechanisms I, occurred laser is divided into two-way, one tunnel inputs to 2 × 2 coupling mechanisms, 1 × 4 coupling mechanism, plated film micro-nano fiber array, 4 × 1 bundling devices, 2 × 1 bundling devices, flashlight detector successively as flashlight, and another road is as the reference light detector inputed to reference to light for detecting reference light intensity.Flashlight detector is electrically connected with amplifier, difference engine, AD converter, phase locking modulator, microcomputer successively.Monitoring device of the present utility model and monitoring method, by micro-nano fiber Coating Materials refraction index changing, affect the transport property of its surperficial evanescent wave.The utility model precision compared with high, can be used in vacuum monitoring of environmental, secondary pollution is few, can meet the particular/special requirement to the monitoring of grease pollutant, can realize easy of integration, easy expansion, highly sensitive, accurate distribution and real-time online measuring.
Description
Technical field
The utility model relates to the grease contamination monitoring device in a kind of superpower laser.
Background technology
Along with the development of modern science and technology, to experiment and the environmental requirement of producing more and more higher, therefore, micropollutants sensing technology has a wide range of applications demand.For device of high power laser, as the U.S. " NIF(National Ignition Facility Project) " laser aid, the flux load ability of major optical parts should reach 14J/cm
2.Result of study shows, optical element surface pollutes the reduction that all can cause surface damage threshold value.Therefore the U.S. has carried out strict regulation to the manufacture of optical element, cleaning, installation and material, ensures that laser aid reduces residual contaminants as far as possible in manufacture, installation process, in use reduces producing pollutant as far as possible.
But the cleaning in early stage controls also to be nowhere near, and still there is organic contamination in systems in which.Mainly because device of high power laser is the huge and vacuum system of complexity, need a large amount of lubricants, be stained with mixture, macromolecular material, packing ring etc., in low vacuum situation, these materials can produce volatilization and form molecular state pollutant, and high energy parasitic light can be produced in laser works situation, the volatilization of these materials can be aggravated under the irradiation of high light.These pollutants will be deposited on surface optical device and form film (even pooling particulate pollutant time serious), beam quality can be affected on the one hand, microburst can be produced by absorbing laser energy on the other hand, micro-damage is formed at surface optical device, the accumulation of this damage finally causes the decline of optic element damage threshold value, and causes the damage of optical element further.
For ensureing the continual and steady work of high power laser system, real time on-line monitoring must be carried out to molecular organic pollutants large in laser aid.
The measuring method of current organic contaminant mainly contains following several mode:
(1) light scattering method.The method has shaping particle collector, the size of particle instead can be released mainly through monitoring scattered light, the method can only study particle floating in air, improperly to use in the environment of condition of high vacuum degree, complicated structure easily introduces secondary pollution, so be not suitable for the requirement of high power laser system to micropollutants, minimum detectable particle is 0.1 μm.
(2) quartz crysta l microbalance.The method is a kind of resonant mode surveying instrument, and the measuring accuracy being mainly used to carry out micro-quality can reach nanogram magnitude, with low cost, has a wide range of applications in fields such as biological medicine, chemistry, environmental monitoring, aviation aviations.The method is owing to being body resonant mode sensing, and its resonance frequency is up to 20MHz, is limited to resonance frequency, and theoretical detection limit is nanogram magnitude.
(3) surface acoustic wave.The ripple of the various patterns that surface acoustic wave general reference is propagated along surface or interface, different boundary conditions and propagation medium can inspire the surface acoustic wave of different mode.Different application conditions uses different excitation waves.The method resonance frequency is hundred MHz magnitudes, can obtain the sensitivity higher than quartz crysta l microbalance, but the surface area of the method large (several average square millimeter) and require high to photoetching technique, limit its development.
(4) film bulk acoustic resonator method.The method resonance frequency can reach GHz magnitude, mass sensitivity 3 magnitudes higher than QCM method, but the method is only suitable for the situation of uniform quality distribution, and sensing area is less.
Micro-nano fiber has strong constraint ability, large evanscent field, strong dispersion characteristic, is convenient to integrated and is easy to ordinary optic fibre advantages such as being connected, is particularly suitable for applying at sensory field.
Summary of the invention
In order to overcome, precision in the monitoring of laser aid grease contamination in prior art is low, vacuum monitoring of environmental, introduce the deficiency of secondary pollution, the utility model provides the monitoring device of the grease contamination in a kind of superpower laser, another object of the present utility model is to provide the grease contamination monitoring method in a kind of superpower laser, can accurate and effective monitoring grease pollutant.
The technical solution of the utility model is:
Grease contamination monitoring device in superpower laser of the present utility model, be characterized in, described monitoring device comprises generating device of laser, 2 × 2 coupling mechanism I, 2 × 2 coupling mechanism II, 1 × 4 coupling mechanism I, 1 × 4 coupling mechanism II, 4 × 1 bundling device I, 4 × 1 bundling device II, 2 × 1 bundling devices, plated film micro-nano fiber array, flashlight detector, reference light detector, amplifier, difference engine, AD converter, phase locking modulator, microcomputer, and wherein generating device of laser contains narrow linewidth laser, fibre optic isolater; The output terminal of described narrow linewidth laser is by after Fiber connection to fibre optic isolater, connect the first port of 2 × 2 coupling mechanisms I, 2 × 2 coupling mechanisms I the 3rd port is connected with 2 × 2 coupling mechanism II first ports by optical fiber, and the 4th port of 2 × 2 coupling mechanisms I is connected with reference light detector by optical fiber; 2 × 2 coupling mechanisms II are connected with 1 × 4 coupling mechanism I, 1 × 4 coupling mechanism II respectively by optical fiber; 1 × 4 coupling mechanism I, 1 × 4 coupling mechanism II is connected with 4 × 1 bundling device I, 4 × 1 bundling devices II respectively by plated film micro-nano fiber array; 4 × 1 bundling device I, 4 × 1 bundling devices II are connected respectively to 2 × 1 bundling devices; 2 × 1 bundling devices by Fiber connection to flashlight detector; Flashlight detector (8) is connected with amplifier (9), difference engine (10), AD converter (11), phase locking modulator (12), microcomputer (13) successively.
Described narrow linewidth laser is electrically connected with phase locking modulator, exports electric signal synchronous with the input electrical signal of generating device of laser for phase locking modulator.
Described plated film micro-nano fiber array, is made up of the plated film micro-nano fiber of same diameter.
The diameter of described plated film micro-nano fiber is 1 ~ 4 μm, and the thickness of plated film is 100nm.
Described generating device of laser is by 2 × 2 coupling mechanisms I, occurred laser is divided into two-way, the road that separates inputs to 2 × 2 coupling mechanisms, 1 × 4 coupling mechanism, plated film micro-nano fiber array, 4 × 1 bundling devices, 2 × 1 bundling devices, flashlight detector successively as flashlight, and an other road is as the reference light detector inputed to reference to light for detecting reference light intensity.
Amplifier in the utility model, difference engine, AD converter and phase locking modulator are integrated in monitoring platform.
For an observation process for the grease contamination monitoring device in superpower laser, comprise the following steps successively:
A). be that the general single mode fiber SMF-28 of 125 microns utilizes scanning melting to draw cone farad to make the micro-nano fiber that diameter is 1 ~ 4 μm by diameter;
B). by the micro-nano fiber drawn, utilize czochralski method plated film, thicknesses of layers is 100nm, and encapsulates, and obtains plated film micro-nano fiber array;
C). the laser occurred by generating device of laser connects plated film micro-nano fiber array as flashlight;
D). plated film micro-nano fiber array connects the flashlight detector being used for detection signal light intensity;
E). generating device of laser produces laser, the laser produced by plated film micro-nano fiber Array transfer to flashlight detector, flashlight detector monitors result divided by reference light detector monitors result draw by micro-nano fiber thin-film refractive index change caused by evanescent wave change and produce luminous energy reduction;
F). according to reduce luminous energy number utilize the method for Fdtd Method can obtain the size of organic contamination substrate concentration.
The beneficial effects of the utility model are, device of the present utility model utilizes micro-nano fiber large evanscent field characteristic to carry out the sensing of volatilizable grease pollutant, by micro-nano fiber Coating Materials refraction index changing, the transmission affecting its surperficial evanescent wave realizes sensing, monitoring device of the present utility model and monitoring method precision higher, can be used in vacuum monitoring of environmental, and secondary pollution is less, can be good at meeting the particular/special requirement to the monitoring of grease pollutant, can realize easy of integration simultaneously, easy expansion, highly sensitive, accurate distribution and real-time online measuring, fundamentally solve the difficult problem measuring grease contamination.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 a is the plated film micro-nano fiber structural representation before experiment;
Fig. 2 b is I-I partial enlarged drawing in Fig. 2 a;
Fig. 3 a is the plated film micro-nano fiber structural representation after experiment;
Fig. 3 b is II-II partial enlarged drawing in Fig. 3 a;
Fig. 4 is automation mechanized operation program of the present utility model;
In figure: 1. narrow linewidth laser 2. fibre optic isolater 3.2 × 2 coupling mechanism I 23.2 × 2 coupling mechanism II 4.1 × 4 coupling mechanism I 24.1 × 4 coupling mechanism II 5. plated film micro-nano fiber array 6.4 × 1 bundling device I 26. 4 × 1 bundling device II 7. 2 × 1 bundling device 8. flashlight detector 14. reference light detector 9. amplifier 10. difference engine 11.AD converter 12. phase locking modulator 13. microcomputer 15. silica membrane 16. micro-nano fiber 17. silica dioxide granule 18. grease pollutant.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further:
Embodiment 1
Fig. 1 is structural representation of the present utility model, in Fig. 1, grease contamination monitoring device in superpower laser of the present utility model comprises generating device of laser, 2 × 2 coupling mechanisms I 3, 2 × 2 coupling mechanisms II 23, 1 × 4 coupling mechanism I 4, 1 × 4 coupling mechanism II 24, 4 × 1 bundling devices I 6, 4 × 1 bundling devices II 26, 2 × 1 bundling devices 7, plated film micro-nano fiber array 5, flashlight detector 8, reference light detector 14, amplifier 9, difference engine 10, AD converter 11, phase locking modulator 12, microcomputer 13, wherein, generating device of laser contains narrow linewidth laser 1, fibre optic isolater 2.The output terminal of described narrow linewidth laser 1 is by after Fiber connection to fibre optic isolater 2, connect the first port 31 of 2 × 2 coupling mechanisms I 3,2 × 2 coupling mechanism I 3 the 3rd ports 33 are connected with 2 × 2 coupling mechanism II 23 first ports by optical fiber, and the 4th port 34 of 2 × 2 coupling mechanisms I 3 is connected with reference light detector 14 by optical fiber; Described 2 × 2 coupling mechanisms II 23 are connected with 1 × 4 coupling mechanism I 4,1 × 4 coupling mechanism II 24 respectively by optical fiber; Described 1 × 4 coupling mechanism I 4 is connected with 4 × 1 bundling devices I 6 by plated film micro-nano fiber array 5, described 1 × 4 coupling mechanism II 24 is connected with 4 × 1 bundling devices II 26 by plated film micro-nano fiber array (5), and described 4 × 1 bundling device I 6,4 × 1 bundling devices II 26 are connected respectively to 2 × 1 bundling devices 7 by optical fiber; 2 × 1 bundling devices 7 are connected with flashlight detector 8 by optical fiber; Flashlight detector 8 is connected with amplifier 9, difference engine 10, AD converter 11, phase locking modulator 12, microcomputer 13 successively.
Generating device of laser in the utility model is by 2 × 2 coupling mechanisms I 3, occurred laser is divided into two-way, institute the road that separates as flashlight successively by 2 × 2 coupling mechanisms II 23, 1 × 4 coupling mechanism I 4 and 1 × 4 coupling mechanism II 24, plated film micro-nano fiber array 5, 4 × 1 bundling device I 6 and 4 × 1 bundling devices II 26, 2 × 1 bundling devices 7, input to flashlight detector 8, the electric signal transformed by flashlight detector 8 is successively by amplifier (9), difference engine (10), AD converter (11) and phase locking modulator (12), reach microcomputer (13) to process, the other road of laser is as the reference light detector 14 inputed to reference to light for detecting reference light intensity.
Described narrow linewidth laser 1 is electrically connected with phase locking modulator 12, exports electric signal synchronous with the input electrical signal of generating device of laser for phase locking modulator 12.
Described plated film micro-nano fiber array 5, is made up of the plated film micro-nano fiber of same diameter.
In the present embodiment, described plated film micro-nano fiber diameter is 2 μm, and the thickness of plated film is 100nm.
For an observation process for the grease contamination monitoring device in superpower laser, comprise the following steps successively:
A). general single mode fiber is placed on D translation platform, utilize oxyhydrogen flame will be heated to more than 1000 DEG C, general single mode fiber elongates by the programmed control stepper motor based on establishment, and heating part fibre diameter reduces, prepare micro-nano fiber, micro-nano fiber is encapsulated.
B). compound concentration is the silicon dioxide colloid of 3%, utilizes alcohol to rinse packaged micro-nano fiber, is fixed on the support of lift coating machine, under pull rate is 300mm/min, carries out lift plated film to the surface of micro-nano fiber.Utilize atomic force microscope to observe plated film micro-nano fiber surface, the thickness calculating rete under this speed is about 100nm, again encapsulates plated film micro-nano fiber.
C). by packaged plated film micro-nano fiber composition array, be connected in light path.
D). the laser sent by generating device of laser connects micro-nano fiber as flashlight, first connecting fiber coupling mechanism, sent laser is divided into the identical laser of two-way, the road sent connects micro-nano fiber as flashlight, and another road connects the reference light detector detecting reference light intensity as reference light.
E). after micro-nano fiber, connect the flashlight detector being used for detection signal light intensity.
F). generating device of laser produces laser, and the laser produced is by micro-nano fiber Array transfer to signal photo-detector, and flashlight detector detects the energy hunting that the evanscent field disturbance that laser causes due to adsorb organic compound in micro-nano fiber causes; The reference light detector connected by fiber coupler, while flashlight detector sensed light signal, reference light detector detects the intensity variation of reference light, flashlight code detector results can be eliminated due to the caused power jitter of generating device of laser itself divided by the result detected by reference light detector, the luminous energy reduced after obtaining thin film adsorbs pollutant, this due to reference light itself be the part that generating device of laser sends laser, light intensity proportion is fixed, not by the impact of external environment.
G). the luminous energy according to reducing utilizes the method for Fdtd Method (FDTD) to draw the change of film refractive index, utilize the change of the change derivation film filling rate of refractive index, finally draw the quality of thin film adsorbs organic contaminant, finally obtain the form of a similar database in the present embodiment, each added losses correspondence one is adsorbed with the quality of organic pollutants, so when the luminous energy change that plated film micro-nano fiber passes through, the quality of organic contaminant can be obtained by loss value.Time-domain finite difference involves the comparatively general method of optical field application at electromagnetism, computer memory is divided into Yee cellular, simultaneously Electric and magnetic fields node space and the time all adopts zigzag sampling, and acceptance condition is set on border, the Electric and magnetic fields on maxwell equation group team node is utilized to carry out recurrence calculation, obtain the light distribution of whole zoning, and then draw the relation in zoning between index distribution and light distribution.
Generating device of laser in the utility model is through fibre optic isolater connecting fiber coupling mechanism, its introducing is to eliminate the impact of rear orientation light on light source, fibre optic isolater utilizes Faraday effect to realize the one-way transmission of luminous energy, prevents the reverse transfer of luminous energy.Flashlight detector and reference light detector all adopt photodetector, and its function is for be converted to electric signal by light signal.That adopt for connecting components is all general single mode fiber (SMF-28), is the main medium of transmission light energy.Micro-nano fiber after plated film carries out ammonia process to strengthen the structural strength of rete.
Fig. 2 a is the plated film micro-nano fiber structural representation before experiment, Fig. 2 b is I-I partial enlarged drawing in Fig. 2 a, in Fig. 2 a, Fig. 2 b, be coated with layer of silicon dioxide film 15 around micro-nano fiber 16, silica dioxide granule 17 is one of particle in silica membrane 15.
Fig. 3 a is the plated film micro-nano fiber structural representation after experiment, and Fig. 3 b is II-II partial enlarged drawing in Fig. 3 a, in Fig. 3 a, Fig. 3 b, and the grease pollutant 18 that after showing experiment, silica membrane 15 adsorbs.
The laser that generating device of laser in the utility model sends transfers to plated film micro-nano fiber array 5 by single-mode fiber, due to silica membrane 15 adsorbed oil lipid pollutant, aerial evanscent field can be transmitted to micro-nano fiber and cause disturbance, produce scattering, so the shake of light energy output can be caused.By detecting the change of light energy output, the quality being adsorbed on micro-nano fiber surface oil lipid pollutant can be extrapolated.
Fig. 4 is automation mechanized operation program of the present utility model, after initial step 100, judges whether 102 complete initialization.If response is affirmative, then step 104 input parameter, this output parameter comprises, such as attenuation coefficient, port selection etc., and then step 106 measures accessory loss value.Following step 108 inputs boundary condition and design conditions, comprises border acceptance condition, refractive index selection, waveguide dimensions, material calculation etc., the relation then between step 110 computed losses and concentration.After this calculation, can start and export step 112, this output can be obtained in certain indicator, or be stored with other record that can retain this result.
Claims (5)
1. the grease contamination monitoring device in a superpower laser, it is characterized in that, described monitoring device comprises generating device of laser, 2 × 2 coupling mechanisms I (3), 2 × 2 coupling mechanisms II (23), 1 × 4 coupling mechanism I (4), 1 × 4 coupling mechanism II (24), 4 × 1 bundling devices I (6), 4 × 1 bundling devices II (26), 2 × 1 bundling devices (7), plated film micro-nano fiber array (5), flashlight detector (8), reference light detector (14), amplifier (9), difference engine (10), AD converter (11), phase locking modulator (12), microcomputer (13), wherein generating device of laser contains narrow linewidth laser (1), fibre optic isolater (2), the output terminal of described narrow linewidth laser (1) is by after Fiber connection to fibre optic isolater (2), connect the first port of 2 × 2 coupling mechanisms I (3), 2 × 2 coupling mechanism I (3) the 3rd ports are connected with 2 × 2 coupling mechanism II (23) first ports by optical fiber, and the 4th port of 2 × 2 coupling mechanisms I (3) is connected with reference light detector (14) by optical fiber, 2 × 2 coupling mechanisms II (23) are connected with 1 × 4 coupling mechanism I (4), 1 × 4 coupling mechanism II (24) respectively by optical fiber, 1 × 4 coupling mechanism I (4), 1 × 4 coupling mechanism II (24) is connected with 4 × 1 bundling device I (6), 4 × 1 bundling devices II (26) respectively by plated film micro-nano fiber array (5), 4 × 1 bundling device I (6), 4 × 1 bundling devices II (26) are connected respectively to 2 × 1 bundling devices (7) by optical fiber, 2 × 1 bundling devices (7) by Fiber connection to flashlight detector (8), flashlight detector (8) is connected with amplifier (9), difference engine (10), AD converter (11), phase locking modulator (12), microcomputer (13) successively.
2. the grease contamination monitoring device in a kind of superpower laser according to claim 1, it is characterized in that, described narrow linewidth laser (1) is electrically connected with phase locking modulator (12), exports electric signal synchronous with the input electrical signal of generating device of laser for phase locking modulator (12).
3. the grease contamination monitoring device in a kind of superpower laser according to claim 1, is characterized in that, described plated film micro-nano fiber array (5) is made up of the plated film micro-nano fiber of same diameter.
4. the grease contamination monitoring device in a kind of superpower laser according to claim 3, is characterized in that, the diameter of described plated film micro-nano fiber is 1 ~ 4 μm, and the thickness of plated film is 100nm.
5. the grease contamination monitoring device in a kind of superpower laser according to claim 1, it is characterized in that, described generating device of laser is by 2 × 2 coupling mechanisms I (3), occurred laser is divided into two-way, the road that separates inputs to 2 × 2 coupling mechanisms, 1 × 4 coupling mechanism, plated film micro-nano fiber array (5), 4 × 1 bundling devices, 2 × 1 bundling devices (7), flashlight detector (8) successively as flashlight, and an other road is as the reference light detector (14) inputed to reference to light for detecting reference light intensity.
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| CN201420652009.6U CN204128961U (en) | 2014-11-05 | 2014-11-05 | Grease contamination monitoring device in a kind of superpower laser |
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| CN201420652009.6U CN204128961U (en) | 2014-11-05 | 2014-11-05 | Grease contamination monitoring device in a kind of superpower laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614719A (en) * | 2015-02-15 | 2015-05-13 | 中国科学院电子学研究所 | Laser radar broadband LFM signal generation and wide visual field receiving device |
| CN111272772A (en) * | 2020-03-18 | 2020-06-12 | 中国工程物理研究院激光聚变研究中心 | Organic pollutant online monitoring device and method based on micro-nano optical fiber long-period grating |
-
2014
- 2014-11-05 CN CN201420652009.6U patent/CN204128961U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614719A (en) * | 2015-02-15 | 2015-05-13 | 中国科学院电子学研究所 | Laser radar broadband LFM signal generation and wide visual field receiving device |
| CN111272772A (en) * | 2020-03-18 | 2020-06-12 | 中国工程物理研究院激光聚变研究中心 | Organic pollutant online monitoring device and method based on micro-nano optical fiber long-period grating |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150128 Termination date: 20191105 |