CN206496890U - Polarization maintaining optical fibre time delay ring test system - Google Patents
Polarization maintaining optical fibre time delay ring test system Download PDFInfo
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- CN206496890U CN206496890U CN201720171588.6U CN201720171588U CN206496890U CN 206496890 U CN206496890 U CN 206496890U CN 201720171588 U CN201720171588 U CN 201720171588U CN 206496890 U CN206496890 U CN 206496890U
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- polarization maintaining
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Abstract
The utility model embodiment is provided in a kind of polarization maintaining optical fibre time delay ring test system, polarised light producing element sends the vertical linearly polarized light in two beam polarization directions, interference light intensity is detected by detector after sensing element and polarization maintaining optical fibre time delay ring round-trip transmission to be measured, because sensing element polarizes light action in the presence of electrical conductor electric current to two beams, it can make current related in the phase difference and electrical conductor between two beam polarised lights of return, and the environment that polarization maintaining optical fibre time delay ring to be measured is presently in can also introduce the phase difference of error influence two-beam, therefore the interference light intensity that detector is detected is converted to after current value, a part is switched on the electric current influence in conductor, a part is that environment described in polarization maintaining optical fibre time delay ring to be measured introduces the influence that error is introduced, so being that can obtain measurement error corresponding with polarization maintaining optical fibre time delay ring local environment to be measured according to the two current values.
Description
Technical field
The utility model is related to optoelectronic device technology field, and in particular to a kind of polarization maintaining optical fibre time delay ring test system.
Background technology
Polarization maintaining optical fibre time delay ring is FOCT (Fiber Optic Current Transformer, optical fiber current mutual inductor)
Core component, be a kind of demand to meet signal transacting increase light path light path, extend the light wave propagation time optical fiber device
Part, its winding mass directly affects FOCT precision.
FOCT is to be based on Faraday magnetooptical effect and Ampere circuit law, and electricity in measured conductor is detected by optical fiber sensing ring
The size of stream, be specially：When have in measured conductor electric current by when, the left-handed and right-hand circular polarization transmitted in optical fiber sensing ring
The phase velocity of light changes in the opposite direction respectively, so that the phase difference (i.e. faraday's phase shift) for being proportional to size of current is produced,
Light path characteristic now is referred to as have nonreciprocity.This phase difference can be measured by interferometric method, and by photodetection
Interference light signal is changed into voltage signal output by device.According to the analysis to voltage signal, you can draw electric current in measured conductor
Size.Influence of the polarization maintaining optical fibre time delay ring to FOCT precision is poor from the nonreciprocal phase that it is introduced in the optical path, should
Phase difference makes interference light signal change, and can not be distinguished with faraday's phase shift, thus introduces measurement error.Therefore needs pair
Polarization maintaining optical fibre time delay ring is tested.
Traditional polarization maintaining optical fibre time delay ring detection method, for example, prolonged by extinction ratio, insertion loss to judge polarization maintaining optical fibre
Shi Huan quality, merely using theory analysis, it is impossible to reflect completely and accurately the winding mass of polarization maintaining optical fibre time delay ring, and
Stress distribution test and polarization coupled distribution tests method cost is too high, complex operation, and test result cannot be directly used to
Its systematic function in FOCT is weighed, so that directly effective skill can not be provided for the screening of polarization maintaining optical fibre time delay ring in FOCT
Art reference index.
Utility model content
The utility model embodiment provides a kind of polarization maintaining optical fibre time delay ring test system, examines polarization maintaining optical fibre time delay ring outside
Performance parameter under portion's environmental excitation simultaneously can carry out equivalents in the form of FOCT measurement errors, so as to be protected in FOCT
The screening of polarisation fibre time delay ring provides directly effective Technical Reference index.
The utility model embodiment provides a kind of polarization maintaining optical fibre time delay ring test system, including：
Sensing element, including fiber optic loop and the optical-fibre wave plate and speculum that are respectively arranged at the fiber optic loop two ends, its
Described in there is electrical conductor to pass through in fiber optic loop；
Polarised light producing element, sends the vertical linearly polarized light in two beam polarization directions, two bunch polarised lights are through polarization-maintaining to be measured
Fiber delay time ring, the optical-fibre wave plate, fiber optic loop transmission, are returned, two bunch after return after speculum reflection
Polarised light is interfered；
Detector, detects interference light intensity, and obtain electric signal corresponding with the interference light intensity；
Signal processing unit, receives the electric signal that the detector is sent, and obtains measuring current value after parsing；
Host computer, reference current value and the measurement electric current in the electrical conductor are worth to the guarantor to be measured
The measurement error that polarisation fibre time delay ring is introduced under local environment.
Alternatively, in above-mentioned polarization maintaining optical fibre time delay ring test system, the polarised light producing element includes light source, coupling
Device and the polarizer, wherein：
The light that the light source is sent enters the polarizer input after the coupler, to produce linearly polarized light；
The output end of the polarizer carries out welding to shaft angle with the polarization maintaining optical fibre time delay ring to be measured using 45 degree, described
Linearly polarized light, which is decomposed into after two bunch polarised lights, to be transmitted to the polarization maintaining optical fibre time delay ring to be measured, and two bunch polarised lights are respectively along institute
The fast axle and slow axis for stating polarization maintaining optical fibre time delay ring to be measured are propagated.
Alternatively, in above-mentioned polarization maintaining optical fibre time delay ring test system, the polarised light producing element includes light source, coupling
Device, the polarizer and straight wave guide modulator, wherein：
The light that the light source is sent enters the polarizer input after the coupler, to produce linearly polarized light；
The output end of the polarizer carries out welding, the linear polarization using 45 degree with the straight wave guide modulator to shaft angle
Light, which is decomposed into after the orthogonal linearly polarized light of two beams, to be transmitted to the straight wave guide modulator；
Two beams are polarized optical transport by the output end of the straight wave guide modulator and the polarization maintaining optical fibre time delay ring welding to be measured
To the polarization maintaining optical fibre time delay ring to be measured, two bunch polarised lights are respectively along the fast axle and slow axis of the polarization maintaining optical fibre time delay ring to be measured
Propagate.
Alternatively, in above-mentioned polarization maintaining optical fibre time delay ring test system, the signal processing unit includes：
Modulated signal output module, output modulated signal to the straight wave guide modulator.
Alternatively, in above-mentioned polarization maintaining optical fibre time delay ring test system, the polarised light producing element includes light source, coupling
Device, Y waveguide modulator and polarization beam combiner, wherein：
The light that the light source is sent enters the modulation input of the Y waveguide modulator after the coupler, to produce
Linearly polarized light, two output ends output through the Y waveguide modulator；
The first end output end of the Y waveguide modulator is with an input of the polarization beam combiner using 90 degree to axle
Angle carries out welding, and the second output end of the Y waveguide modulator uses 0 degree pair with another input of the polarization beam combiner
Shaft angle carries out welding, so that into the polarised light orthogonal for two beams of the polarization beam combiner；
The output end of the polarization beam combiner and the polarization maintaining optical fibre time delay ring welding to be measured, by the polarised light that two beams are orthogonal
Transmit to the polarization maintaining optical fibre time delay ring to be measured, the orthogonal polarised light of two beams is respectively along the fast of the polarization maintaining optical fibre time delay ring to be measured
Axle and slow axis are propagated.
Alternatively, in above-mentioned polarization maintaining optical fibre time delay ring test system, the signal processing unit includes：
Modulated signal output module, output modulated signal to the Y waveguide modulator.
Alternatively, in above-mentioned polarization maintaining optical fibre time delay ring test system, in addition to：
Environment generator, the polarization maintaining optical fibre time delay ring to be measured is placed in inside the environment generator, and the environment occurs
The control signal of device response host computer simulates the polarization maintaining optical fibre time delay ring local environment to be measured.
Alternatively, in above-mentioned polarization maintaining optical fibre time delay ring test system, the guarantor to be measured of the environment generator simulation
Polarisation fibre time delay ring local environment includes：At least one of temperature, humidity, vibration, impact and irradiation.
Alternatively, in above-mentioned polarization maintaining optical fibre time delay ring test system, in addition to：
Current feedback circuit, output predetermined current to the electrical conductor；
Benchmark transformer, detects that the current feedback circuit exports the current value of predetermined current, as in the electrical conductor
Reference current value.
Alternatively, in above-mentioned polarization maintaining optical fibre time delay ring test system, in addition to：
Error calculation unit, obtains the reference current value and the letter in the electrical conductor of the benchmark transformer detection
The corresponding electric current of the polarization maintaining optical fibre time delay ring local environment to be measured that the parsing of number processing unit is obtained is worth to the measurement and missed
Difference；
The error calculation unit sends the measurement error to the host computer.
In polarization maintaining optical fibre time delay ring test system described in the utility model embodiment, polarised light producing element sends two beams
The vertical linearly polarized light in polarization direction, is visited after sensing element and polarization maintaining optical fibre time delay ring round-trip transmission to be measured by detector
Interference light intensity is measured, because sensing element polarizes light action in the presence of electrical conductor electric current to two beams, the two of return can be made
It is current related in phase difference and electrical conductor between beam polarised light, and the environment that polarization maintaining optical fibre time delay ring to be measured is presently in
Also after error, which can be introduced, influences the phase difference of two-beam, therefore the interference light intensity that detects of detector is converted to current value, one
Part is switched on the electric current influence in conductor, and a part is that environment described in polarization maintaining optical fibre time delay ring to be measured introduces the shadow that error is introduced
Ring, so being that can obtain measurement error corresponding with polarization maintaining optical fibre time delay ring local environment to be measured according to the two current values.It is logical
Cross and particular design carried out to light path, make transmission means of the light wave in above-mentioned test system similar to optical transport mode in FOCT,
Form of the form of expression of the measurement error finally given also with FOCT measurement errors is equivalent, therefore is implemented using the utility model
The such scheme energy that example is provided is complete and accurately reflects the precision of polarization maintaining optical fibre time delay ring, and test result can be directly used for
Its systematic function in FOCT is weighed, directly effective Technical Reference is provided referred to for the screening of polarization maintaining optical fibre time delay ring in FOCT
Mark.
Brief description of the drawings
Fig. 1 is the theory diagram of polarization maintaining optical fibre time delay ring test system structure described in the utility model one embodiment；
Fig. 2 is the structural representation of polarised light generation unit described in the utility model one embodiment；
Fig. 3 is the structure that polarised light generation unit described in the utility model one embodiment uses straight wave guide modulator to realize
Schematic diagram；
Fig. 4 is the structure that polarised light generation unit described in the utility model one embodiment uses Y waveguide modulator to realize
Schematic diagram；
Fig. 5 is the theory diagram of polarization maintaining optical fibre time delay ring test system structure described in the utility model another embodiment.
Embodiment
The utility model embodiment is further illustrated below in conjunction with accompanying drawing.
Embodiment 1
The present embodiment provides a kind of polarization maintaining optical fibre time delay ring test system, as shown in figure 1, including polarised light producing element 1,
Sensing element, detector 3, signal processing unit 4 and host computer 5, wherein：
The sensing element, including fiber optic loop 21 and the He of optical-fibre wave plate 22 for being respectively arranged at the two ends of fiber optic loop 21
Speculum 23, wherein there is electrical conductor 6 to pass through in the fiber optic loop 21.The optical-fibre wave plate can select 1/4 optical-fibre wave plate, institute
It is faraday mirror, optical fiber metallic-membrane plating reflector, fiber optic patch speculum etc. to state speculum.
The polarised light producing element 1, sends the vertical linearly polarized light in two beam polarization directions, two bunch polarised lights are through described
Polarization maintaining optical fibre time delay ring 7 to be measured, the optical-fibre wave plate 22, the fiber optic loop 21 are transmitted, in transmitting procedure, two bunch polarised lights
In it is wherein a branch of along in light path polarization maintaining optical fibre fast axle transmit, another curb slow axis transmission；It is anti-by the speculum 23
Returned after penetrating, two bunch polarised lights after return are interfered；Wherein two bunch polarised lights pass through optical-fibre wave plate and faraday mirror
Afterwards, 90 degree of deflections can occur for polarization direction, i.e., original linearly polarized light transmitted in fast axle is changed to slow axis transmission, original slow axis
The linearly polarized light of transmission is changed to fast axle transmission, and polarization maintaining optical fibre time delay ring 7 to be measured is entered back into afterwards and is transmitted.By polarization maintaining optical fibre to be measured
After time delay ring 7, then by polarised light generation unit 1, only retain the linearly polarized light on fast axle or slow axis, now fast axle or slow
There are two bunch polarised lights on axle, two bunch polarised lights, which have phase difference, to be interfered.
The detector 3, detects interference light intensity, and obtain electric signal corresponding with the interference light intensity, general detection
Interference light intensity can be converted to voltage signal by device.
The signal processing unit 4, receives the electric signal that the detector 3 is sent, and obtains measuring current value after parsing.It is aobvious
So, on the basis of the measurement current value is the reference current value passed through in former electrical conductor, it addition of polarization maintaining optical fibre to be measured and prolong
When the measurement error that introduces of ring.
The host computer 5, obtains the measurement error that the polarization maintaining optical fibre time delay ring 7 to be measured is introduced under local environment, institute
Reference current value and the measurement electric current of the measurement error in the electrical conductor 6 is stated to be worth to.The reference current
It is worth the actual current value by leading in electrical conductor, by obtained by benchmark transformer measurement.Therefore, according to existing calculation formula,
Reference current value and measurement current value, host computer is that can obtain measurement error, and calculation formula is obtained according to FOCT principles, can
It is preset in the host computer.
Wherein, the polarization maintaining optical fibre time delay ring local environment to be measured can be corresponding environment in prespecified environment
The parameters such as middle temperature, humidity have been pre-stored in host computer.Or, as shown in figure 1, passing through the ring being arranged in environment
Each ambient parameter in the measuring environment of border sensor 8, testing result is sent into host computer, thus just may be used in host computer 5
Accordingly preserved with the measurement error for being brought ambient parameter and polarization maintaining optical fibre time delay ring 7 to be measured under the ambient parameter
Come.
As it was previously stated, FOCT principle is to be based on Faraday magnetooptical effect and Ampere circuit law, namely by sensing element
Have in the electrical conductor of detection electric current by when, a phase difference for being proportional to size of current can be produced, the phase difference is simultaneously
It is proportional to the optical fiber number of turn of sensing element.A branch of linearly polarized light is divided into the mutually orthogonal two-beam wave train of polarization mode in light path
Middle transmission, by optical-fibre wave plate, can be such that light wave is listed between linear polarization and circular polarization state and exchange, by fiber reflector,
Can make light wave arrange circular polarization state it is left-handed between dextrorotation exchange, when in measured conductor no current by when, this two-beam
The polarization state that the wave train is lived through and path are fully equivalent, simply there is difference (such as wherein light beam wave train on time order and function
It is followed successively by follow to the polarization state undergone when returning to sensing point：Fast axle polarization-left-handed-dextrorotation-slow axis polarization, then separately
The polarization state that the light beam wave train is undergone in identical light path is followed successively by：Slow axis polarization-dextrorotation-is left-handed-fast axle polarization), this
Kind in the case of, the characteristic of light path be referred to as be with reciprocity, when have in measured conductor electric current by when, in sensing element (light
Fine sensing ring) in the left-handed and right-circularly polarized light phase velocity of transmission change in the opposite direction respectively, so as to produce direct ratio
In the phase difference (i.e. faraday's phase shift) of size of current, light path now is referred to as with nonreciprocity.This phase difference can
To be measured by interferometric method, and interference light signal is changed into voltage signal output by photodetector.
How be specifically described below can push away to obtain measurement error according to interference light intensity.With reference to Fig. 1：
Assuming that with the distance of speculum 23 being z sections of short section of optical fiber δ at z position on polarization maintaining optical fibre time delay ring 7 to be measured
The rate of change for the environmental excitation (such as temperature, stress) being subjected to isThe refractive index of optical fiber is turned to the change of environment
Certain moment, the light wave sent from light source is listed in the phase place change produced on fiber segment δ z and is：
N is optical fibre refractivity in formula, and λ is light source center wavelength.
Through after a period of time, due to environmental change, the refractive index of this section of optical fiber is changed, from the reflection of speculum end
The light wave returned is listed in the phase place change produced on fiber segment δ z：
In formula：
Formula (3) is represented from fiber segment δ z to speculum again into fiber segment δ z this light path (comprising fast and slow axis conversion) because of ring
Border excitation change and produce change in optical path length corresponding to linearly polarized light transmission time difference, Δ n be polarization maintaining optical fibre fast and slow axis it
Between refringence, c is vacuum light speed.
Formula (2) and formula (3), which are subtracted each other, can obtain fiber segment δ z nonreciprocal phase errors caused by environmental change：
Change over time in view of fiber segment δ z environmental excitation, total phase error can be obtained to above formula integration：
Δ β is the linear birefrigence coefficient of polarization maintaining optical fibre in formula, and L is from polarization maintaining optical fibre time delay ring input to be measured to optical fiber
The geometrical length of speculum.
In view of in actual use, the environmental excitation more than one suffered by polarization maintaining optical fibre time delay ring to be measured, it is assumed that whole rings
Σ is used in border excitation successively1、Σ2……Σm(m >=2) are represented, then polarization maintaining optical fibre time delay ring to be measured is encouraged and produced by external environment condition
Total phase error be represented by
FOCT no-load voltage ratio computational methods are：
Φ in formulaSFor the phase difference actually produced in FOCT light paths, ΦFThe faraday's phase shift produced for electric current, it is thereinThe measurement error that polarization maintaining optical fibre time delay ring as to be measured is introduced, when polarization maintaining optical fibre time delay ring to be measured is by external environment condition
During incentive action, FOCT no-load voltage ratio can accurately reflect shadow of the environmental change to polarization maintaining optical fibre time delay ring overall performance to be measured
Ring, thus it is good and bad that the performance of polarization maintaining optical fibre time delay ring to be measured can be weighed by FOCT no-load voltage ratio.
In summary, the utility model is based on optical fiber current mutual inductor principle, has directly built for testing polarization-maintaining to be measured
The detecting system of fiber delay time ring performance, its testing result (generally being characterized with FOCT measurement error) can directly be fed back to treat
Levels of system performance of the polarization maintaining optical fibre time delay ring under the excitation of various external environment conditions is surveyed, to be used as the polarization-maintaining light to be measured for FOCT
The reliable screening criteria of fine time delay ring system index.
Embodiment 2
In the present embodiment, as shown in Fig. 2 the polarised light generating unit can be realized in the following way：
It includes light source 101, coupler 102 and the polarizer 103, and the light that the light source 101 is sent is through the coupler 102
Enter the input of the polarizer 103 afterwards, to produce the linearly polarized light of single direction polarization；The output end of the polarizer 102
Welding is carried out to shaft angle using 45 degree with the polarization maintaining optical fibre time delay ring 7 to be measured, two beams are polarized into optical transport to the guarantor to be measured
Polarisation fibre time delay ring 7.Why 45 degree are used to the output end of the polarizer 102 described in shaft angle welding and the polarization maintaining optical fibre to be measured
Time delay ring 7, is in order that two beam polarised lights can uniformly enter the fast axle and slow axis of the polarization maintaining optical fibre time delay ring 7 to be measured.
As shown in figure 3, polarised light generating unit described in the present embodiment can be realized in the following way：
The polarised light generating unit includes light source 201, coupler 202, the polarizer 203 and straight wave guide modulator 204, its
In：
The light that the light source 201 is sent enters the input of the polarizer 203 after the coupler 202, to produce list
The linearly polarized light of one direction polarization；The output end of the polarizer 203 is with the straight wave guide modulator 204 using 45 degree to shaft angle
Welding is carried out, to produce the two bunch polarised lights that polarization direction is mutually orthogonal, two beams polarization optical transport to the straight wave guide is adjusted
Device 204 processed；The output end of the straight wave guide modulator 204 and the welding of polarization maintaining optical fibre time delay ring 7 to be measured, by two beam polarised lights
Transmit to the polarization maintaining optical fibre time delay ring 7 to be measured.Because output signal and phase difference caused by electric current meet cosine function relationship,
To obtain high sensitivity, it will usually apply biasing using modulation, be allowed to be operated in the point that a response slope is not zero, therefore
Straight wave guide modulator 204 is addition of in the present embodiment, its modulated signal can be inputted by PC control, or pass through letter
Number processing unit 4 is inputted, in this case, and the signal processing unit 4 includes modulated signal output module, exports modulated signal
To the straight wave guide modulator.
As shown in figure 4, polarised light generating unit described in the present embodiment can be realized in the following way：
The polarised light generating unit includes light source 301, coupler 302, Y waveguide modulator 303 and polarization beam combiner
304, wherein：
The light that the light source 301 is sent is inputted after the coupler 302 into the modulation of the Y waveguide modulator 303
End, to produce the linearly polarized light of single direction polarization, two output ends output through the Y waveguide modulator 303；The Y ripples
The first end output end of modulator 303 is led to melt shaft angle using 90 degree with an input of the polarization beam combiner 304
Connect；Another input of second output end and the polarization beam combiner uses 0 degree to carry out welding, the polarization coupling to shaft angle
Two beams are polarized optical transport to the polarization maintaining optical fibre to be measured by the output end of device 304 and the welding of polarization maintaining optical fibre time delay ring 7 to be measured
Time delay ring 7.When wherein two output ends of Y waveguide modulator carry out welding with polarization beam combiner, 90 degree are respectively adopted to shaft angle
With 0 degree to shaft angle.The signal processing unit 4 includes modulated signal output module, and output modulated signal to the Y waveguide is modulated
Device.
In each above-mentioned scheme that the present embodiment is provided, it can directly use and have opto-electronic device, the polarizer therein, when
When light is from coupler into the polarizer, the polarizer is used to produce polarised light；And when light enters the polarizer from straight wave guide modulator,
The polarizer can play a part of analyzing, that is, filter out the light in fast axle or slow axis.Similarly, in Y waveguide modulator, light is worked as
When entering Y waveguide modulator from coupler, Y waveguide modulator generates a branch of linearly polarized light, and one of branch melts for 90 ° in experience
Switching transmission main shaft after point, forms the mutually orthogonal linearly polarized light in two beam polarization directions, and two bunch polarised lights enter respectively
Enter in polarization beam combiner；And when light has respectively entered two output ends of Y waveguide modulator from polarization beam combiner, Y waveguide is adjusted
Device processed carries out conjunction beam, the operation of analyzing to two-beam.Straight wave guide modulator therein, when light is modulated from polarizer input straight wave guide
During device, straight wave guide modulator is modulated to optical signal, is modulated after light is returned from polarization-maintaining time delay ring to be measured by straight wave guide
It is demodulated by signal processing unit after device, detector.
Embodiment 3
The polarization maintaining optical fibre time delay ring test system that the present embodiment is provided, as shown in figure 5, also including：
Environment generator 9, the polarization maintaining optical fibre time delay ring 7 to be measured is placed in inside the environment generator, the environment hair
The control signal that raw device 9 responds the host computer 5 simulates the local environment of polarization maintaining optical fibre time delay ring 7 to be measured.Wherein described ring
The polarization maintaining optical fibre time delay ring local environment to be measured of border generator simulation includes：In temperature, humidity, vibration, impact and irradiation
At least one.For example, single temperature control box, humidification device, shaking platform etc..Can also be that a variety of environmental factors integrate progress
Regulation and control.Polarization maintaining optical fibre time delay ring local environment to be measured is controlled using environment generator 9, other environment can be prevented effectively from
Influence of the interference of change to testing result.Moreover, environment generator is controlled by host computer, input environment can be easy to join
Number, convenient adjustment and management to ambient parameter.
Further, said system also includes：
Current feedback circuit 10, output predetermined current to the electrical conductor.Benchmark transformer 11, detects that the electric current occurs
Device exports the current value of predetermined current, is used as the reference current value in the electrical conductor.Error calculation unit 12, obtains described
Reference current value and the signal processing unit 4 in the electrical conductor that benchmark transformer 11 is detected parse obtain described and treated
Survey the corresponding electric current of the local environment of polarization maintaining optical fibre time delay ring 7 and be worth to the measurement error；The error calculation unit 12 is sent
The measurement error is to the host computer 5.More can accurately it be controlled in the electrical conductor using current feedback circuit 10
Size of current, correspondingly the benchmark transformer 11, directly can also be used as energization using the current value of current feedback circuit output
The reference current value of conductor.And shown by Fig. 2 or Fig. 3 or Fig. 4 in the optical-electric module shown in Fig. 5, as embodiment 2
Component and its annexation, specifically including polarised light generation unit, detector and signal processing unit.
The step of being tested using said system polarization maintaining optical fibre time delay ring is included：
Be structural representation according to the theory diagram described in above-described embodiment, by the polarization maintaining optical fibre time delay ring to be measured with
Optical-electric module, sensing element connection in system, for each device for needing to connect, it can reserve tail optical fiber, directly by difference
The tail optical fiber of device carries out welding according to default to shaft angle.Polarization maintaining optical fibre time delay ring to be measured is placed in environment generator, and
And complete the connection of environment generator and host computer.Firing current generator, by host computer, the output to signal processing unit
Current value is demarcated, and is allowed to consistent with the output current value of benchmark transformer and (is not produced any environment in environment generator
In the case of excitation, the result that signal processing unit is obtained should be identical with reference current value).Sent out by PC control environment
Raw device, is allowed to generation environment excitation.The measurement error results exported by error calculation unit are read and preserved by host computer.For
Additional measurement error is avoided, when above test is carried out, in addition to environment generator internal environment, remaining environment should keep steady
It is fixed.
The core point of the utility model above-described embodiment is, according to FOCT identical Computing Principles, by polarization-maintaining light to be measured
Linear birefringence effect of the fine time delay ring under outside environmental excitation is detected, and progress etc. in the form of FOCT measurement errors
Effect expression, to be used as the reference index for weighing polarization maintaining optical fibre delay ring quality to be measured.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：
It can still modify to the technical scheme described in foregoing embodiments, or which part technical characteristic is carried out etc.
With replacement；And these modifications or replacement, the essence of appropriate technical solution is departed from each embodiment technology of the utility model
The spirit and scope of scheme.
Claims (10)
1. a kind of polarization maintaining optical fibre time delay ring test system, it is characterised in that including：
Sensing element, including fiber optic loop and the optical-fibre wave plate and speculum that are respectively arranged at the fiber optic loop two ends, wherein institute
Stating in fiber optic loop has electrical conductor to pass through；
Polarised light producing element, sends the vertical linearly polarized light in two beam polarization directions, two bunch polarised lights are through polarization maintaining optical fibre to be measured
Time delay ring, the optical-fibre wave plate, fiber optic loop transmission, are returned after speculum reflection, the two bunch polarization after return
Light is interfered；
Detector, detects interference light intensity, and obtain electric signal corresponding with the interference light intensity；
Signal processing unit, receives the electric signal that the detector is sent, and obtains measuring current value after parsing；
Host computer, reference current value and the measurement electric current in the electrical conductor are worth to the polarization-maintaining light to be measured
The measurement error that fine time delay ring is introduced under local environment.
2. polarization maintaining optical fibre time delay ring test system according to claim 1, it is characterised in that the polarised light producing element
Including light source, coupler and the polarizer, wherein：
The light that the light source is sent enters the polarizer input after the coupler, to produce linearly polarized light；
The output end of the polarizer carries out welding using 45 degree with the polarization maintaining optical fibre time delay ring to be measured to shaft angle, and the line is inclined
The light that shakes, which is decomposed into after two bunch polarised lights, to be transmitted to the polarization maintaining optical fibre time delay ring to be measured, and two bunch polarised lights are treated along described respectively
The fast axle and slow axis for surveying polarization maintaining optical fibre time delay ring are propagated.
3. polarization maintaining optical fibre time delay ring test system according to claim 1, it is characterised in that the polarised light producing element
Including light source, coupler, the polarizer and straight wave guide modulator, wherein：
The light that the light source is sent enters the polarizer input after the coupler, to produce linearly polarized light；
The output end of the polarizer carries out welding, the linearly polarized light point to shaft angle with the straight wave guide modulator using 45 degree
Solve to transmit after the orthogonal linearly polarized light of two beams to the straight wave guide modulator；
Two beams are polarized optical transport to institute by the output end of the straight wave guide modulator and the polarization maintaining optical fibre time delay ring welding to be measured
Polarization maintaining optical fibre time delay ring to be measured is stated, two bunch polarised lights are passed along the fast axle and slow axis of the polarization maintaining optical fibre time delay ring to be measured respectively
Broadcast.
4. polarization maintaining optical fibre time delay ring test system according to claim 3, it is characterised in that the signal processing unit bag
Include：
Modulated signal output module, output modulated signal to the straight wave guide modulator.
5. polarization maintaining optical fibre time delay ring test system according to claim 1, it is characterised in that the polarised light producing element
Including light source, coupler, Y waveguide modulator and polarization beam combiner, wherein：
The light that the light source is sent enters the modulation input of the Y waveguide modulator after the coupler, inclined to produce line
Shake light, two output ends output through the Y waveguide modulator；
The first end output end of the Y waveguide modulator and an input of the polarization beam combiner are entered using 90 degree to shaft angle
Row welding, the second output end of the Y waveguide modulator is with another input of the polarization beam combiner using 0 degree to shaft angle
Welding is carried out, so that into the polarised light orthogonal for two beams of the polarization beam combiner；
The output end of the polarization beam combiner and the polarization maintaining optical fibre time delay ring welding to be measured, by the polarization optical transport that two beams are orthogonal
To the polarization maintaining optical fibre time delay ring to be measured, the orthogonal polarised light of two beams respectively along the polarization maintaining optical fibre time delay ring to be measured fast axle and
Slow axis is propagated.
6. polarization maintaining optical fibre time delay ring test system according to claim 5, it is characterised in that the signal processing unit bag
Include：
Modulated signal output module, output modulated signal to the Y waveguide modulator.
7. the polarization maintaining optical fibre time delay ring test system according to claim any one of 1-6, it is characterised in that also include：
Environment generator, the polarization maintaining optical fibre time delay ring to be measured is placed in inside the environment generator, and the environment generator rings
The control signal of host computer is answered to simulate the polarization maintaining optical fibre time delay ring local environment to be measured.
8. polarization maintaining optical fibre time delay ring test system according to claim 7, it is characterised in that：
The polarization maintaining optical fibre time delay ring local environment to be measured of the environment generator simulation includes：Temperature, humidity, vibration, punching
At least one of hit and irradiate.
9. polarization maintaining optical fibre time delay ring test system according to claim 7, it is characterised in that also include：
Current feedback circuit, output predetermined current to the electrical conductor；
Benchmark transformer, detects that the current feedback circuit exports the current value of predetermined current, is used as the base in the electrical conductor
Quasi- current value.
10. polarization maintaining optical fibre time delay ring test system according to claim 9, it is characterised in that also include：
Error calculation unit, is obtained at the reference current value and the signal in the electrical conductor of the benchmark transformer detection
The corresponding electric current of the polarization maintaining optical fibre time delay ring local environment to be measured that reason unit resolves are obtained is worth to the measurement error；
The error calculation unit sends the measurement error to the host computer.
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