CN204256264U - A kind of double light path is integrated in the Michelson interferometer type light path correlator in same optical fiber - Google Patents
A kind of double light path is integrated in the Michelson interferometer type light path correlator in same optical fiber Download PDFInfo
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- CN204256264U CN204256264U CN201420796016.3U CN201420796016U CN204256264U CN 204256264 U CN204256264 U CN 204256264U CN 201420796016 U CN201420796016 U CN 201420796016U CN 204256264 U CN204256264 U CN 204256264U
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Abstract
The utility model belongs to technical field of optical fiber, what be specifically related to is that one can be used for the interference of back scattering optical time domain with frequency domain interferometer measuration system, and the double light path that also can be used in the demodulating system of multiplex fibre optic white light interference sensor array is integrated in the Michelson interferometer type light path correlator in a same optical fiber.Double light path is integrated in the Michelson interferometer type light path correlator in same optical fiber, by single-mode fiber 1, tapered zone 2, eccentric twin-core fiber 3, twin-core fiber end face annular reflectance coating 4, GRIN Lens rod 5 and catoptron 6 form, single-core fiber and the connection of eccentric twin-core fiber are bored by implementing to add hot-drawn at solder joint place after being welded by two kinds of optical fiber and form tapered zone thus define an optical splitter, got up by two kinds of Fiber connection by tapered zone, the injection light from light source is divided into two-way by optical splitter.The utility model eliminates the error and uncertainty brought to measuring system due to discrete light path.
Description
Technical field
The utility model belongs to technical field of optical fiber, what be specifically related to is that one can be used for the interference of back scattering optical time domain with frequency domain interferometer measuration system, and the double light path that also can be used in the demodulating system of multiplex fibre optic white light interference sensor array is integrated in the Michelson interferometer type light path correlator in a same optical fiber.
Background technology
Optical fiber white light interference technology and method is a kind of measuring method and sensing technology that show unique characteristics in technical field of optical fiber.This technical skill is in the research of wide spectrum optical interference pattern, absolute deformation Fibre Optical Sensor is measured, the structure of fiber waveguide device and the detection to light wave reflection characteristic parameters thereof, in optical fibre gyro ring, polarization state transverse coupling is measured and assessment, especially, in the optical chromatography technology etc. of the institutional framework form of medical clinic applications, all have a wide range of applications.
Light path correlator is the formant of space light path scan matching in the interferometric demodulation system of spatial domain.The object of this unit realizes (FBG) demodulator to mate with the light path of interference measuring instrument, thus realize the task of being completed measurement by the method for interferometer.Light path correlator forms primarily of two parts: a part is the light channel structure of (FBG) demodulator; Another part is space light path scanister.
For solving the light path relevant issues in fiber optic interferometric instrument system, nineteen ninety-five U.S. H-P company Wayne V.Sorin and Douglas Μ .Baney discloses a kind of light path autocorrelator based on Michelson interferometer structure (United States Patent (USP): the patent No. 5557400).As shown in Figure 1, it is based on Imbalance Michelson interferometer structure, mating between the optical path difference utilizing light signal to be formed between Michelson interferometer fixed arm and variable sweep arm and the optical path difference of former and later two end face reflection light signals of Fibre Optical Sensor, realizes optics auto-correlation, obtains the white light interference signal of sensor.This correlator is made up of a 3dB fiber coupler, and after incident light wave injects, this light wave is divided into two-way after 2 × 2 fiber couplers, and a road returns output through its End reflector after regular length optical fiber; Another road, after the optics collimator being connected to optical fiber end, is reflected by moveable reflective scan mirror, arrives output terminal after forming the adjustable light wave of light path.The optical path difference that these two light waves produced by this optical fiber light path correlator have is 2 (n Δ L+x), and wherein 2n Δ L is that two regular length optical fiber difference bands come, and 2x is then the adjustable light path in space.The advantage of Michelson interferometer type optical fiber light path correlator is simple structure, and the device of use is few.But shortcoming is all devices is all be separated, and when environment temperature skewness, because temperature difference causes regular length reference path and these two parts of scanning optical path to produce optical path difference, this will cause the decline of measuring accuracy further.
Utility model content
The error that the purpose of this utility model is to provide a kind of elimination to bring to measuring system due to discrete circuit ambient temperature gradient and probabilistic double light path are integrated in the Michelson interferometer type light path correlator in same optical fiber.
The purpose of this utility model is achieved in that
Double light path is integrated in the Michelson interferometer type light path correlator in same optical fiber, by single-mode fiber 1, tapered zone 2, eccentric twin-core fiber 3, twin-core fiber end face annular reflectance coating 4, GRIN Lens rod 5 and catoptron 6 form, single-core fiber and the connection of eccentric twin-core fiber are bored by implementing to add hot-drawn at solder joint place after being welded by two kinds of optical fiber and form tapered zone thus define an optical splitter, by tapered zone, two kinds of Fiber connection are got up, injection light from light source is divided into two-way by optical splitter, two ways of optical signals is through twin-core fiber, a wherein eccentric road light the annular reflection film that plates by twin-core fiber end face reflect, export as signal, another road light signal transmits along central core and passes annular reflection film and arrived at plane mirror by after GRIN Lens rod collimation, and plane mirror can move along optical path direction, the optical path difference between adjustment reflected output signals and signal export.
The fuse of the disalignment of twin-core fiber and the spacing in axle center are d, twin-core fiber end face adopts local, center mask to be coated with endless metal reflectance coating as catoptron, the internal diameter of annular reflection film is less than 2d, and the light of axle center fuse can be aimed at and shine the axle center of GRIN Lens rod.
Twin-core fiber is symmetrical twin-core fiber, the axle center of two all equidistant stray fiber of fibre core, and the spacing in the fuse of disalignment and axle center is d, the half of twin-core fiber end face adopts mask method, fiber end face half is made to be coated with half-round metal reflectance coating, the light transmitted in one of them fiber core is returned by semicircle reflecting film reflects, and the optical registration of another fiber core also shines the axle center of GRIN Lens rod.
The beneficial effects of the utility model are:
The utility model adopts twin-core fiber, most of light path micro of the two-way light of interferometer is integrated in same optical fiber, because the space length between two light paths only has some tens of pm, and all in same optical fiber silica clad, therefore its environment temperature difference can be very little, can be considered as approximate identical.So it is also approximate identical that the light path of this two-way light varies with temperature situation, this just makes the optical path difference between both relatively highly stable, eliminates the error and uncertainty brought to measuring system due to discrete light path.Can be used for back scattering optical time domain to interfere with frequency domain interferometer measuration system, also can be used in the demodulating system of multiplex fibre optic white light interference sensor array.
Accompanying drawing explanation
Fig. 1 is the structural representation of typical white light interference Michelson interferometer type light path correlator.
Fig. 2 is the structural representation adopting the double light path of diplocardia fibre optic construction to be integrated in the Michelson interferometer type light path correlator in same optical fiber.Fig. 3 is the bifocal path structure schematic diagram be made up of single-core fiber and eccentric twin-core fiber, at twin-core fiber end, have employed the way of local, center mask, be coated with endless metal film as optical reflection film, the signal reflex of disalignment light path is gone back, and the light signal that another road is not reflected realizes collimation through GRIN Lens.
Fig. 4 is the bifocal path structure schematic diagram be made up of single-core fiber and symmetric double core fibre, at twin-core fiber end, have employed the way of part fiber end face mask, be coated with half-round metal film as optical reflection film, one road light signal of twin-core fiber is reflected back, and the light signal that another road is not reflected realizes collimation through GRIN Lens.
Fig. 5 is that the Michelson interferometer type light path correlator be integrated in by this double light path in same optical fiber is linked into and is connected with the light path schematic diagram that measuring system realizes light path correlator embody rule.
Fig. 6 is the light path schematic diagram that the Michelson interferometer type light path correlator be integrated in by this double light path in same optical fiber is linked into the practical application example being connected with displacement measurement.
Embodiment
Below in conjunction with accompanying drawing citing, the utility model is described in more detail:
Be integrated in the Michelson interferometer type light path correlator in same optical fiber based on double light path, its structure as shown in Figure 2.This light path correlator is by single-mode fiber 1, tapered zone 2, eccentric twin-core fiber 3, and twin-core fiber end face annular reflectance coating 4, GRIN Lens rod 5 and catoptron 6 form.This light path correlator is formed as follows: single-core fiber 1 and the connection of eccentric twin-core fiber 3 form tapered zone 2 by implementing to add hot-drawn after being welded by two kinds of optical fiber at solder joint place and boring thus define an optical splitter, also got up by two kinds of Fiber connection by this tapered zone simultaneously.Injection light 7 from light source is divided into two-way by this optical splitter, this two ways of optical signals through twin-core fiber 3, a wherein eccentric road light the annular reflection film 4 that plates by twin-core fiber end face reflect, export as signal 8; Another road light signal transmits along central core and passes annular reflection film 4 and arrived at plane mirror 6 by after GRIN Lens rod 5 collimation, plane mirror 6 can move forward and backward along the X direction, thus the optical path difference between adjustment reflected output signals 9 and signal 8, realize light path and be correlated with.
This double light path is integrated in the Michelson interferometer type light path correlator in same optical fiber, the twin-core fiber adopted is eccentric twin-core fiber, the fibre core at its center is in the axle center of optical fiber, and the spacing in the fuse of disalignment and axle center is d, this twin-core fiber end face is coated with annular reflection film 4, internal diameter as the annular reflection film of catoptron is less than 2d, to ensure that the light transmitted in the fiber core in stray fiber axle center is reflected by this Perimeter Truss Reflector, as shown in Figure 3.
Without prejudice to the spirit of the utility model patent, this double light path is integrated in the Michelson interferometer type light path correlator in same optical fiber, also symmetrical twin-core fiber can be adopted, the axle center of two all equidistant stray fiber of fibre core, and the spacing in the fuse of disalignment and axle center is d, the half of this twin-core fiber end face is coated with reflectance coating 4, to ensure that the light transmitted in one of them fiber core in two fiber cores is reflected by this semi-circular mirror, and the light of another fiber core can be aimed at and shine the axle center of GRIN Lens rod, as shown in Figure 4.
This double light path Michelson interferometer type light path correlator be integrated in same optical fiber can be used for constructing optical fiber white light interference measuring system, as shown in Figure 5.This measuring system is around four fiber port circulators, successively the light of Low coherence wide spectrum light source 14 (such as: ASE light source) is first entered the port a of optical fiber circulator, via outlet b, the double light path that arrival light path is adjustable is integrated in the Michelson interferometer type light path correlator 15 in same optical fiber.The effect of this light path correlator has two, and one is that the light from same light source is divided into two bundles; Two is make this two-beam signal produce adjustable optical path difference.Light from light source be divided into after this light path correlator there is certain optical path difference two-beam after the b port of four fiber port circulators, interferometry unit 17 is admitted to by Transmission Fibers 16 by port c, in optical fibre interference unit, because unit to be measured can produce two reflected signals, measured physical quantity is comprised wherein, so carry out the scanning of light path coupling by light path correlator, mix interference light signal after Transmission Fibers 16, by the port d of four fiber port circulators receive by photodetector, this signal is exaggerated after device 18 amplifies and arrives at signal acquiring and processing system 19, analysis and treament is carried out to signal.
The utility model adopts twin-core fiber, most of light path micro of the two-way light of interferometer is integrated in same optical fiber, because the space length between two light paths only has some tens of pm, and all in same optical fiber silica clad, therefore its environment temperature difference can be very little, can be considered as approximate identical.So it is also approximate identical that the light path of this two-way light varies with temperature situation, this just makes the optical path difference between both relatively highly stable, eliminates the error and uncertainty brought to measuring system due to discrete circuit ambient temperature gradient.
In Fig. 2, single-core fiber 1 and the connection of eccentric twin-core fiber 3 form tapered zone 2 by implementing to add hot-drawn after being welded by two kinds of optical fiber at solder joint place and boring thus define an optical splitter, also got up by two kinds of Fiber connection by this tapered zone simultaneously.Injection light 7 from light source is divided into two-way by this optical splitter, this two ways of optical signals through twin-core fiber 3, a wherein eccentric road light the annular reflection film 4 that plates by twin-core fiber end face reflect, export as signal 8; Another road light signal transmits along central core and passes annular reflection film 4 and arrived at plane mirror 6 by after GRIN Lens rod 5 collimation, plane mirror 6 can move forward and backward along the X direction, thus the optical path difference between adjustment reflected output signals 9 and signal 8, realize light path and be correlated with.
The form adopting the double light path Michelson interferometer type light path correlator be integrated in same optical fiber to carry out stellar interferometer structure has multiple, and Fig. 6 gives a kind of typical structure realizing displacement measurement.In order to realize the measurement of different physical quantities, stellar interferometer can be constructed by the way measuring unit of different structure being embedded into interferometry arm.
The situation that Fig. 6 is corresponding is stellar interferometer and light path correlator is all reflection-type, and in this case, corresponding Topology connection belongs to the connection between typical 4, therefore needs employing four fiber port circulator.Illustrate that in order to provide further the system that Fig. 6 adopts Fizeau optical wedge to realize the interferometry of displacement light path coupling for provides the connection array mode of above-mentioned typical light paths more intuitively.Within the system, by four fiber port circulators, wideband A SE light source 14 is injected in the Michelson interferometer type light path correlator 15 that double light path is integrated in same optical fiber by port a to port b.The effect of this light path correlator has two, and one is that the light from same light source is divided into two bundles; Two is make this two-beam signal produce adjustable optical path difference.Be divided into two bundles and the light signal with certain predetermined optical path difference leaves port b, by port c, then through teletransmission optical fiber 16, be admitted in stellar interferometer.And stellar interferometer is the interferometer measuration system that the Fizeau optical wedge shown in Fig. 6 realizes great-scale displacement.
Small change in optical path length, by geometric displacement, can be converted into the change in displacement compared with large scale, thus realize the displacement measurement of grand yardstick by Fizeau optical wedge.This device is fixed on slidably on push rod 22 by a wedge shape optical device 21 as producing the wedge of fizeau interferometer, optical wedge faces optical fiber collimator 20, when the slide bar be connected with top spring is subjected to displacement, the change in optical path length that optical wedge produces is proportional to the displacement of slide bar.Because the angle of optical wedge is very little, change in optical path length less so just can correspond to the mechanical shift of larger slide bar, therefore by this mechan-amplifier, just achieves and adopts microscale technology to obtain grand yardstick displacement measurement.
Claims (3)
1. a double light path is integrated in the Michelson interferometer type light path correlator in same optical fiber, by single-mode fiber (1), tapered zone (2), eccentric twin-core fiber (3), twin-core fiber end face annular reflectance coating (4), GRIN Lens rod (5) and catoptron (6) composition, it is characterized in that: single-core fiber and the connection of eccentric twin-core fiber are bored by implementing to add hot-drawn at solder joint place after being welded by two kinds of optical fiber and form tapered zone thus define an optical splitter, by tapered zone, two kinds of Fiber connection are got up, injection light from light source is divided into two-way by optical splitter, two ways of optical signals is through twin-core fiber, a wherein eccentric road light the annular reflection film that plates by twin-core fiber end face reflect, export as signal, another road light signal transmits along central core and passes annular reflection film and arrived at plane mirror by after GRIN Lens rod collimation, and plane mirror can move along optical path direction, the optical path difference between adjustment reflected output signals and signal export.
2. a kind of double light path according to claim 1 is integrated in the Michelson interferometer type light path correlator in same optical fiber, it is characterized in that: the fuse of the disalignment of described twin-core fiber and the spacing in axle center are d, twin-core fiber end face adopts local, center mask to be coated with endless metal reflectance coating as catoptron, the internal diameter of annular reflection film is less than 2d, and the light of axle center fuse can be aimed at and shine the axle center of GRIN Lens rod.
3. a kind of double light path according to claim 1 is integrated in the Michelson interferometer type light path correlator in same optical fiber, it is characterized in that: described twin-core fiber is symmetrical twin-core fiber, the axle center of two all equidistant stray fiber of fibre core, and the spacing in the fuse of disalignment and axle center is d, the half of twin-core fiber end face adopts mask method, fiber end face half is made to be coated with half-round metal reflectance coating, the light transmitted in one of them fiber core is returned by semicircle reflecting film reflects, the optical registration of another fiber core also shines the axle center of GRIN Lens rod.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104503079A (en) * | 2014-12-15 | 2015-04-08 | 哈尔滨工程大学 | Michelson interferometer type optical path correlator integrating double optical paths in same optical fiber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503079A (en) * | 2014-12-15 | 2015-04-08 | 哈尔滨工程大学 | Michelson interferometer type optical path correlator integrating double optical paths in same optical fiber |
| CN104503079B (en) * | 2014-12-15 | 2017-04-12 | 哈尔滨工程大学 | Michelson interferometer type optical path correlator integrating double optical paths in same optical fiber |
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Granted publication date: 20150408 Effective date of abandoning: 20170412 |