CN103364343A - Optical fiber gas chamber device based on hollow-core photonic crystal optical fiber - Google Patents
Optical fiber gas chamber device based on hollow-core photonic crystal optical fiber Download PDFInfo
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Abstract
The invention discloses an optical fiber gas chamber device based on a hollow-core photonic crystal optical fiber. The optical fiber gas chamber device comprises one or more optical fiber coupling gas cavity units which are connected in series, and each optical fiber coupling gas cavity unit comprises two optical fiber coupling gas cavities, wherein the first and second optical fiber coupling gas cavities are connected in series; a multimode/single-mode optical fiber in each optical fiber coupling gas cavity is coupled with the hollow-core photonic crystal optical fiber; the multimode/single-mode optical fiber in the first optical fiber coupling gas cavity is connected to an optical fiber light source; the hollow-core photonic crystal optical fiber is connected to a gas cavity of the next optical fiber gas chamber; the first and second optical fiber coupling gas cavities are communicated through the hollow-core photonic crystal optical fiber; the multimode/single-mode optical fiber in the second optical fiber coupling gas cavity is connected with a spectrum demodulation device; a vent hole of the first optical fiber coupling gas cavity is connected with a gas cylinder, and a vent hole of the second optical fiber coupling gas cavity is connected with a micro extraction pump, a waste gas collecting device and a pressure gage. According to the device, the defects that the inflation of a hollow-core photonic crystal optical fiber gas chamber needs long time and complex operation as well as a vacuumizing device are effectively overcome.
Description
Technical field
The present invention relates to the fiber-optic fiber gas detection field, particularly relate to the full optical fiber gas cell device based on hollow-core photonic crystal fiber.
Background technology
In spectral absorption formula gas detection with optical fiber, one of key parameter that effective absorption light path of system is decision systems detection sensitivity and accuracy of detection, it is longer effectively to absorb light path, and detection sensitivity and accuracy of detection are higher.Simultaneously, conclusive effect has been played in the whether easy selection to the applicable environment of system of air chamber use itself.The design of optical fiber air chamber should consider above-mentioned two aspects.
Traditional optics air chamber generally is divided into one way air chamber and long-range air chamber.The one way air chamber normally is fixed on a pair of optical fiber collimator the two ends of cylindrical cavity, processing, assembly difficulty and the temperature performance of the collimating apparatus of long reach is unstable but such air chamber structure designs, cause effective absorption distance of one way air chamber to be difficult to break through 50cm, otherwise the loss meeting is very large.The long-range air chamber mainly contains White's type air chamber, Herriott type air chamber and right-angle prism air chamber etc.The long-range air chamber by special light path design so that light beam in air chamber repeatedly toward interflection, thereby increased effective absorption light path of gas.Than the one way air chamber, the small volume of long-range air chamber, effectively absorption distance is long, but because light Multi reflection in air chamber can cause larger optical transmission loss, therefore also very high to the requirement of plated film.And the long-range air chamber structure is complicated, debug difficulties, poor stability is not easy to carry, price is high, these shortcomings so that the application of long-range air chamber be greatly limited.
The above-mentioned technical limitation of solution that appears as of hollow-core photonic crystal fiber (Hollow-core photonic crystal fiber is called for short HC-PCF) has been created condition.This is a kind of novel light conduction optical fiber, and its leaded light mechanism is all different from index guide structure type and full-internal reflection type optical fiber.Its fibre core is the air-core structure, and covering is made of the small pore of strict periodic arrangement, and there is forbidden photon band in the photon crystal material of clad section to the light of certain wavelength, propagates thereby light field is strapped in the fibre core.Along with the development of photonic crystal fiber theoretical research and manufacture level, a collection of hollow-core photonic crystal fiber with broadband, low loss characteristic is come out one after another.
Hollow-core photonic crystal fiber has flexible use in the certain limit, volume is little to be easy to carry about with one and the advantage such as security height, unique internal structure and leaded light are machine-processed in addition, especially natural with ordinary optic fibre coupled characteristic, so that this type optical fiber is aspect learning gas and light interaction, particularly in spectral absorption type gas detection with optical fiber, have unique advantage, development potentiality is extremely huge.
At present hollow-core photonic crystal fiber is documented in following three classes that mainly contain in the open source literature as air chamber:
The first kind is direct diffusion method.Chinese patent CN200710061910.0 places hollow-core photonic crystal fiber integral body in the closed chamber that is connected with gas to be measured, and the free diffusing by gas molecule reaches gas to be measured is written into purpose in the optical fiber hollow.The shortcoming of these class methods is extremely to expend time in, and when hollow-core photonic crystal fiber is not long, still needs tens minutes even a few hours.When fiber lengths reached several meters, the method just more expended time in.
Equations of The Second Kind is that high pressure is inculcated method.Get through several small pores or reserve a finedraw at the fiber coupler of joint, hollow-core photonic crystal fiber two ends, the method that charges by high pressure is filled with gas to be measured in the hollow of optical fiber.Compare the direct diffusion method of the first kind, the method inflationtime shortens, but complicated to small pore and finedraw charge operation, and the preparation of gases at high pressure has also increased complexity and cost that gas concentration detects.In relevant paper, owing to there is not gas closing device, when carrying out gas concentration measurement, the gas to be measured in the optical fiber hollow is always by the external environment condition gas dilution.Chinese patent CN200610049134.8 and CN200620100419.5 are placed on the two ends of hollow-core photonic crystal fiber respectively in two air chamber, but its shortcoming is when hollow-core photonic crystal fiber is inflated, original waste gas can only by the fine fibre core discharging of hollow-core photonic crystal fiber, must increase the difficulty of system and the time of inflation in the air chamber.And the coupling device of aiming at that does not have hollow-core photonic crystal fiber and ordinary optic fibre in the air chamber in this patent.
The 3rd class is the vacuum type aeration.Chinese patent CN200710021208.1 at first is placed on the two ends of optical fiber respectively in two airtight air chamber, by the air chamber of an end is wherein vacuumized processing, and then will measure in the gas input air chamber to be measured.Chinese patent CN201110170536.4 and CN201110170589.6 with hollow-core photonic crystal fiber and ordinary optic fibre carry out non-fusing type aim at coupling fixing after, together with two Coupling points hollow-core photonic crystal fiber is put into low pressure sealed gas chamber device, after utilizing vacuum pump to vacuumize processing, then gas to be measured is passed in the low pressure sealed gas chamber and measure.The shortcoming of these class methods is to have introduced complicated huge vacuum extractor, and complicacy and cost that gas is detected all increase greatly.
Therefore, do not have so far a kind of inflationtime shorter, charge operation makes things convenient for and does not use the air chamber based on hollow-core photonic crystal fiber of vacuum extractor.
Summary of the invention
Problem based on above-mentioned prior art exists the present invention proposes the optical fiber gas cell device based on hollow-core photonic crystal fiber, depends on the hollow-core photonic crystal fiber technology and consists of a kind of novel long-range gas cell device.
The present invention proposes a kind of optical fiber gas cell device based on hollow-core photonic crystal fiber, it is characterized in that, this device comprises one and more than one cascaded fiber coupling air chamber unit, and this cascaded fiber coupling air chamber unit comprises two coupling fiber air chamber, wherein:
First, second coupling fiber air chamber 321,322 series connection, single-mode fiber 341 in the coupling fiber air chamber and hollow-core photonic crystal fiber 33 couplings, the single-mode fiber 341 of the first coupling fiber air chamber 321 is connected to optical fiber source 31, and hollow-core photonic crystal fiber 33 is connected to the air chamber of next optical fiber air chamber; Connecting by hollow-core photonic crystal fiber 33 between first, second coupling fiber air chamber realize to connect, and the single-mode fiber 341 of the second coupling fiber air chamber 322 connects spectrum demodulating equipments 310; The blow vent that the blow vent of the first coupling fiber air chamber 321 connects gas cylinder 35, the second coupling fiber air chamber 322 connects micro-suction pump 312 and waste gas collection device 313, tensimeter 311; At gas cylinder 35, tensimeter 311, micro-suction pump 12, waste gas collection device 13 arrange respectively Automatic slucie valve 36,37,38 and 39.
Described coupling fiber air chamber comprises cylindrical gas chamber 2 and upper and lower square air chamber end cap 31,32; Cylindrical gas chamber 2 sticks with glue with upper and lower square air chamber end cap 31,32 and connects, and with the screw 1 fixing air chamber that forms, and air chamber 2 and end cap 31,32 surface of contact are air tight; A pair of blow vent 4 is fixed on valve on the air chamber 2 by screw thread; Optical fiber through hole 5, single-mode fiber 6, hollow-core photonic crystal fiber 7, fiber optic protection device 8 and the joints of optical fibre 9 are used for the bearer connection coupled fiber; Single-mode fiber 6 and hollow-core photonic crystal fiber 7 penetrate from the two ends of running through upper and lower end cap 31,32 optical fiber through hole 5 respectively, consist of a pair of coupled fiber; Two tip sides of coupled fiber are fixed on the joints of optical fibre 9; again the joints of optical fibre 9 are pasted and fixed in the fiber optic protection device 8; wherein, the two ends of fiber optic protection device 8 are mounted to respectively in two end caps 3 of air chamber 2, the joints of optical fibre 9 are played the effect of fixing protection.
Mode type according to optical fiber source (31) output optical mode type and fiber spectrum demodulating equipment (310) reception light, select the pattern optical fiber (341) and (342) that are complementary, be single-mode fiber to single-mode fiber, multimode optical fiber is to multimode optical fiber.
Described many/keep the 10-50um space between single-mode fiber end face and the hollow-core photonic crystal fiber end face.
The invention allows for a kind of optical fiber gas cell device based on hollow-core photonic crystal fiber, comprise continuous a plurality of cascaded fiber coupling air chamber unit, this cascaded fiber coupling air chamber unit comprises a pair of coupling fiber air chamber, it is characterized in that:
First, second coupling fiber air chamber (321), (322) series connection, single-mode fiber in the coupling fiber air chamber (341) and hollow-core photonic crystal fiber (33) coupling, the single-mode fiber (341) of the first coupling fiber air chamber (321) is connected to optical fiber source (31), and hollow-core photonic crystal fiber 33 is connected to the air chamber of next optical fiber air chamber; Connecting by hollow-core photonic crystal fiber (33) between first, second coupling fiber air chamber realize to connect, and the single-mode fiber (342) of the second coupling fiber air chamber (322) connects spectrum demodulating equipment (310); The blow vent of the first coupling fiber air chamber (321) connects gas cylinder (35), and the blow vent of the second coupling fiber air chamber (322) connects micro-suction pump (312) and waste gas collection device (313), tensimeter (311); In gas cylinder (35), tensimeter (311), micro-suction pump (12), waste gas collection device (13) arranges respectively Automatic slucie valve (36), (37), (38) and (39), described continuous a plurality of cascaded fiber coupling air chamber unit being connected to each other: the preceding the hollow-core fiber of the second air chamber in the cascaded fiber coupling air chamber unit with after the be coupled monofilm coupling fiber of the first air chamber in the air chamber unit of cascaded fiber be connected, arrange so continuously, form the optical fiber gas cell device with continuous a plurality of cascaded fiber coupling air chamber unit.
Described coupling fiber air chamber comprises cylindrical gas chamber (2) and upper and lower square air chamber end cap (31), (32); Cylindrical gas chamber (2) and upper and lower square air chamber end cap (31), (32) stick with glue and connect, and with the fixing air chamber that forms of screw (1), air chamber (2) and end cap (31, the surface of contact of (32) is air tight; A pair of blow vent (4) is fixed on valve on the air chamber (2) by screw thread; Optical fiber through hole (5), single-mode fiber (6), hollow-core photonic crystal fiber (7), fiber optic protection device (8) and the joints of optical fibre (9) are used for bearing coupled optical fiber; Single-mode fiber (6) penetrates from the two ends of running through the optical fiber through hole (5) on upper and lower end cap (31), (32) respectively with hollow-core photonic crystal fiber (7), consists of a pair of coupled fiber; Two tip sides of coupled fiber are fixed on the joints of optical fibre (9); again the joints of optical fibre (9) are sticked in the fiber optic protection device (8); the two ends of fiber optic protection device (8) are mounted to respectively in two end caps 3 of air chamber (2), the joints of optical fibre (9) are played the effect of fixing protection.
Receive the mode type of light according to optical fiber source (31) output optical mode type and fiber spectrum demodulating equipment (310), select the pattern optical fiber (341 and 342) that is complementary, namely single-mode fiber is to single-mode fiber, and multimode optical fiber is to multimode optical fiber.
Described many/keep 10-50 μ m space between single-mode fiber end face and the hollow-core photonic crystal fiber end face.
Compared with prior art, the invention solves in traditional absorption-type gas detection with optical fiber, one way air chamber detection sensitivity is low, long-range air chamber optical texture is complicated, the shortcomings such as poor stability, solve simultaneously effectively the hollow-core photonic crystal fiber formula chamber inflated time long, charge operation is complicated and need to use the shortcoming such as vacuum extractor.For this reason, a kind of novel air chamber based on hollow-core photonic crystal fiber of Patent design of the present invention, inflationtime can be controlled in several minutes, and volume is little, be convenient to integrated and carry.
Description of drawings
Fig. 1 the present invention is based on coupling fiber air chamber front view in the optical fiber gas cell device of hollow-core photonic crystal fiber;
Fig. 2 the present invention is based on coupling fiber air chamber left view in the optical fiber gas cell device of hollow-core photonic crystal fiber;
Fig. 3 is the fundamental diagram that the present invention is based on the optical fiber gas cell device of hollow-core photonic crystal fiber.
Reference numeral:
Among Fig. 1, Fig. 2: 1, screw, 2, the cylindrical gas chamber, 3, square air chamber end cap, 4, blow vent; 5, optical fiber through hole, 6, single-mode fiber, 7, hollow-core photonic crystal fiber; 8, fiber optic protection device, 9, the joints of optical fibre, in the A partial enlarged drawing of Fig. 1: 10, optical fiber coating.
Among Fig. 3: 31, optical fiber source, 321,322 air chamber, 33, hollow-core photonic crystal fiber, 341,342 normal transmission optical fiber, 35, gas cylinder, Automatic slucie valve 36,37,38 and 39,310, fiber spectrometer (OSA) or spectrum demodulating equipment FFP etc., 311, tensimeter, 312, micro-suction pump, 313, waste gas collection device.
Embodiment
At first the one-piece construction of the optical fiber gas cell device based on hollow-core photonic crystal fiber of the present invention specifically described.
As shown in Figure 1 and Figure 2, structure front elevation and the left view of one of building block of the optical fiber gas cell device based on hollow-core photonic crystal fiber of the present invention coupling fiber air chamber.
Wherein, cylindrical gas chamber 2 sticks with glue with upper and lower square air chamber end cap 31,32 and connects, and forms air chamber with screw 1 is fixing, and guarantees that air chamber 2 and end cap 31,32 surface of contact are air tight.A pair of blow vent 4 is fixed on valve on the air chamber 2 by screw thread.Optical fiber through hole 5, single-mode fiber 6, hollow-core photonic crystal fiber 7, fiber optic protection device 8 is used for bearing coupled optical fiber, the joints of optical fibre 9.Its concrete structure is: single-mode fiber 6 penetrates from the two ends of running through the optical fiber through hole 5 on the upper and lower end cap 31,32 respectively with hollow-core photonic crystal fiber 7, consists of a pair of coupled fiber; Two tip sides of coupled fiber are fixed on the joints of optical fibre 9; again the joints of optical fibre 9 are pasted and fixed in the fiber optic protection device 8; wherein; the two ends of fiber optic protection device 8 are mounted to respectively in two end caps 3 of air chamber 2 and are fixed, and play to reduce the suffered extraneous stress of optical fiber and protect optical fiber and the effect of firm tie point.
Among Fig. 1 shown in the partial enlarged drawing of A, single-mode fiber 6 is peeled coat off with hollow-core photonic crystal fiber 7, and the coupled end of two optical fiber of surplus covering only is placed on the joints of optical fibre 9.During coupling fiber, single-mode fiber 6 and hollow-core photonic crystal fiber 7 are connected to respectively light source and light power meter, regulate the relative position of two fibre cores in coupling fiber point place, keep the 10-50um space between single-mode fiber end face and the hollow-core photonic crystal fiber end face.When the light power meter registration is maximum, keep two fibre core relative positions constant and two fibre cores are sticked on the joints of optical fibre 9.
Below by a specific embodiment, further describe technical scheme of the present invention.
As shown in Figure 3, the fundamental diagram of the measuring system that forms for the optical fiber gas cell device that the present invention is based on hollow-core photonic crystal fiber, wherein dotted portion is gas cell device of the present invention.Among this embodiment, the coupling fiber air chamber that gas cell device comprises two series connection forms: with first, the second coupling fiber air chamber 321,322 series connection, in the coupling fiber air chamber common many/single-mode fiber 341, during hollow-core photonic crystal fiber 33 coupling, with the first coupling fiber air chamber 321 common many/single-mode fiber 341 is connected to optical fiber source 31, hollow-core photonic crystal fiber 33 is connected to the air chamber of next optical fiber air chamber, connect by hollow-core photonic crystal fiber 33 between the two coupling fiber air chamber and realize to connect, the blow vent that the blow vent of the first coupling fiber air chamber 321 connects gas cylinder 35, the second coupling fiber air chamber 322 connects micro-suction pump 312 and waste gas collection device 313, tensimeter 311; At gas cylinder 35, tensimeter 311, micro-suction pump 12, waste gas collection device 13 arrange respectively Automatic slucie valve 36,37,38 and 39.
This measuring system in use, at first valve 36,37 and 39 is opened, and air chamber 321 and 322 is carried out gas washing, after the foreign gas that exists before the 321 and 322 interior inflations is discharged fully, orderly close-down valve 39 and 37.Open valve 38, start micro-suction pump 312, carry out gas washing to the hollow of hollow-core photonic crystal fiber this moment, after foreign gas in the hollow all is discharged from micro-suction pump 312, stops micro-suction pump 312, and valve-off 38 is opened valve 37.When the registration that shows when rain glass 311 reaches gas and detects desired force value, valve-off 36.
To closing the airway passage between two chambeies behind two air chamber 321,322 gas washings, while shutdown system Waste gas outlet also starts micro-suction pump, and produce pressure differential between two air chamber this moment, and the pressure extent depends on the operating power of aspiration pump.Owing to only have the hollow of hollow-core photonic crystal fiber to be conducted between two air chamber, therefore the gas washing efficient of hollow-core photonic crystal fiber hollow improved greatly.When being full of gas to be measured in the hollow-core photonic crystal fiber hollow, miniature air pump quits work.When the valve open between two air chamber on the wireway, the registration that shows when rain glass reached gas and detect desired force value, gas cylinder stopped air feed.
Claims (8)
1. the optical fiber gas cell device based on hollow-core photonic crystal fiber comprises cascaded fiber coupling air chamber unit, and this cascaded fiber coupling air chamber unit comprises a pair of coupling fiber air chamber, it is characterized in that:
First, second coupling fiber air chamber (321), (322) series connection, single-mode fiber in the coupling fiber air chamber (341) and hollow-core photonic crystal fiber (33) coupling, the single-mode fiber (341) of the first coupling fiber air chamber (321) is connected to optical fiber source (31), and hollow-core photonic crystal fiber 33 is connected to the air chamber of next optical fiber air chamber; Connecting by hollow-core photonic crystal fiber (33) between first, second coupling fiber air chamber realize to connect, and the single-mode fiber (342) of the second coupling fiber air chamber (322) connects spectrum demodulating equipment (310); The blow vent of the first coupling fiber air chamber (321) connects gas cylinder (35), and the blow vent of the second coupling fiber air chamber (322) connects micro-suction pump (312) and waste gas collection device (313), tensimeter (311); In gas cylinder (35), tensimeter (311), micro-suction pump (12), waste gas collection device (13) arrange respectively Automatic slucie valve (36), (37), (38) and (39).
2. the optical fiber gas cell device based on hollow-core photonic crystal fiber as claimed in claim 1 is characterized in that, described coupling fiber air chamber comprises cylindrical gas chamber (2) and upper and lower square air chamber end cap (31), (32); Cylindrical gas chamber (2) and upper and lower square air chamber end cap (31), (32) stick with glue and connect, and with the fixing air chamber that forms of screw (1), air chamber (2) and end cap (31, the surface of contact of (32) is air tight; A pair of blow vent (4) is fixed on valve on the air chamber (2) by screw thread; Optical fiber through hole (5), single-mode fiber (6), hollow-core photonic crystal fiber (7), fiber optic protection device (8) and the joints of optical fibre (9) are used for bearing coupled optical fiber; Single-mode fiber (6) penetrates from the two ends of running through the optical fiber through hole (5) on upper and lower end cap (31), (32) respectively with hollow-core photonic crystal fiber (7), consists of a pair of coupled fiber; Two tip sides of coupled fiber are fixed on the joints of optical fibre (9); again the joints of optical fibre (9) are sticked in the fiber optic protection device (8); the two ends of fiber optic protection device (8) are mounted to respectively in two end caps 3 of air chamber (2), the joints of optical fibre (9) are played the effect of fixing protection.
3. the optical fiber gas cell device based on hollow-core photonic crystal fiber as claimed in claim 1, it is characterized in that, mode type according to optical fiber source (31) output optical mode type and fiber spectrum demodulating equipment (310) reception light, select the pattern optical fiber (341) and (342) that are complementary, be single-mode fiber to single-mode fiber, multimode optical fiber is to multimode optical fiber.
4. the optical fiber gas cell device based on hollow-core photonic crystal fiber as claimed in claim 1 is characterized in that, described many/keep 10-50 μ m space between single-mode fiber end face and the hollow-core photonic crystal fiber end face.
5. the optical fiber gas cell device based on hollow-core photonic crystal fiber comprises continuous a plurality of cascaded fiber coupling air chamber unit, and this cascaded fiber coupling air chamber unit comprises a pair of coupling fiber air chamber, it is characterized in that:
First, second coupling fiber air chamber (321), (322) series connection, single-mode fiber in the coupling fiber air chamber (341) and hollow-core photonic crystal fiber (33) coupling, the single-mode fiber (341) of the first coupling fiber air chamber (321) is connected to optical fiber source (31), and hollow-core photonic crystal fiber 33 is connected to the air chamber of next optical fiber air chamber; Connecting by hollow-core photonic crystal fiber (33) between first, second coupling fiber air chamber realize to connect, and the single-mode fiber (342) of the second coupling fiber air chamber (322) connects spectrum demodulating equipment (310); The blow vent of the first coupling fiber air chamber (321) connects gas cylinder (35), and the blow vent of the second coupling fiber air chamber (322) connects micro-suction pump (312) and waste gas collection device (313), tensimeter (311); In gas cylinder (35), tensimeter (311), micro-suction pump (12), waste gas collection device (13) arranges respectively Automatic slucie valve (36), (37), (38) and (39), described continuous a plurality of cascaded fiber coupling air chamber unit being connected to each other: the preceding the hollow-core fiber of the second air chamber in the cascaded fiber coupling air chamber unit with after the be coupled monofilm coupling fiber of the first air chamber in the air chamber unit of cascaded fiber be connected, arrange so continuously, form the optical fiber gas cell device with continuous a plurality of cascaded fiber coupling air chamber unit.
6. the optical fiber gas cell device based on hollow-core photonic crystal fiber as claimed in claim 1 is characterized in that, described coupling fiber air chamber comprises cylindrical gas chamber (2) and upper and lower square air chamber end cap (31), (32); Cylindrical gas chamber (2) and upper and lower square air chamber end cap (31), (32) stick with glue and connect, and with the fixing air chamber that forms of screw (1), air chamber (2) and end cap (31, the surface of contact of (32) is air tight; A pair of blow vent (4) is fixed on valve on the air chamber (2) by screw thread; Optical fiber through hole (5), single-mode fiber (6), hollow-core photonic crystal fiber (7), fiber optic protection device (8) and the joints of optical fibre (9) are used for bearing coupled optical fiber; Single-mode fiber (6) penetrates from the two ends of running through the optical fiber through hole (5) on upper and lower end cap (31), (32) respectively with hollow-core photonic crystal fiber (7), consists of a pair of coupled fiber; Two tip sides of coupled fiber are fixed on the joints of optical fibre (9); again the joints of optical fibre (9) are sticked in the fiber optic protection device (8); the two ends of fiber optic protection device (8) are mounted to respectively in two end caps 3 of air chamber (2), the joints of optical fibre (9) are played the effect of fixing protection.
7. the optical fiber gas cell device based on hollow-core photonic crystal fiber as claimed in claim 1, it is characterized in that, mode type according to optical fiber source (31) output optical mode type and fiber spectrum demodulating equipment (310) reception light, select the pattern optical fiber (341 and 342) that is complementary, be single-mode fiber to single-mode fiber, multimode optical fiber is to multimode optical fiber.
8. the optical fiber gas cell device based on hollow-core photonic crystal fiber as claimed in claim 1 is characterized in that, described many/keep 10-50 μ m space between single-mode fiber end face and the hollow-core photonic crystal fiber end face.
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| CN104596996A (en) * | 2015-01-06 | 2015-05-06 | 香港理工大学深圳研究院 | Gas detection method and gas detection system based on hollow-core optical fiber photothermal effect |
| CN105388113B (en) * | 2015-11-20 | 2019-05-31 | 上海斐讯数据通信技术有限公司 | Gas detection equipment |
| CN105388113A (en) * | 2015-11-20 | 2016-03-09 | 上海斐讯数据通信技术有限公司 | Gas detection equipment |
| CN106483606A (en) * | 2016-12-26 | 2017-03-08 | 中国人民解放军国防科学技术大学 | A kind of low-loss all -fiber low pressure gas lumen of body system and its implementation |
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| CN110749572A (en) * | 2019-10-29 | 2020-02-04 | 广州特种承压设备检测研究院 | Novel graphene optical fiber gas sensor measuring system and method for measuring hydrogen sulfide gas by using same |
| CN111504922A (en) * | 2020-04-07 | 2020-08-07 | 武汉大学 | Device and method for detecting gas components in GIS (gas insulated switchgear) based on hollow-core photonic crystal fiber |
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