CN205909835U - Measurement system based on optics is relevant interferes - Google Patents
Measurement system based on optics is relevant interferes Download PDFInfo
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- CN205909835U CN205909835U CN201620650511.2U CN201620650511U CN205909835U CN 205909835 U CN205909835 U CN 205909835U CN 201620650511 U CN201620650511 U CN 201620650511U CN 205909835 U CN205909835 U CN 205909835U
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Abstract
The utility model discloses a measurement system based on optics is relevant interferes, including semiconductor laser, with interference system that semiconductor laser connects, with interfere the headtotail the optic fibre that awaits measuring, with await measuring the fiber connection the relevant receiving system of polarization diversity optical heterodyne, with fiber coupler that the relevant receiving system of polarization diversity optical heterodyne connects, with photoelectric detector that fiber coupler connects, with signal processing unit that photoelectric detector connects and with the auxiliary device that signal processing unit connects, measurement system based on optics is relevant interferes adopt the relevant receiving system of polarization diversity optical heterodyne, have mainly solved two problems, a lot of intervene problem during the one of which is measured, polarization decline problem among next coherent detection to the detectivity who has improved.
Description
Technical field
The utility model belongs to optical coherence interference technique field, is specifically related to a kind of survey based on optical coherence interference
Amount system.
Background technology
Optical interferometry technology is a special kind of skill based on principle of optical interference, with general measuring method
Compare, because interfering instrument to be to reflect measurand with interference fringe, the such as change of displacement, reflectivity, refractive index, wavelength etc.
Change information, so optical interferometry technology has higher sensitivity and precision, interferometric method principle is simple, and construction easily, is surveyed
Accuracy of measurement is high, and measurement range is wide, and conventional interference instrument has Michelson's interferometer, Mach-Zehnder interferometer, Feisuo to interfere
Instrument, Twyman Green Interferometer, after laser occurs, the development of electronic technology and computer technology in addition, optical interference techniques
Obtain long term growth.
Extensive concern both domestic and external is caused based on the optic Fiber Detecting Technology of optical coherence interference technique, as one kind extremely
Important measurement and analysis means, it can be widely used in the fault detect of optical fiber link, bridge, dam, oil pipeline, electricity
The health monitoring of the large scale component such as line of force road, and the landslide early warning of mine, tunnel, building etc..
But when being based on the detection of light coherent interference in actual fiber detection process, multiple interference problem in measurement, occurs
And light polarization fading problem occurs, in addition in the case that environmental disturbances are larger, all can affect the detection of light coherent interference
Accuracy and sensitivity.
Content of the invention
For solving the above problems, the utility model discloses a kind of measuring system based on optical coherence interference, have relatively
High accuracy and sensitivity.
In order to reach object above, the utility model provides a kind of following technical scheme: survey based on optical coherence interference
Amount system, is connected with described interference system including the interference system that semiconductor laser is connected with described semiconductor laser
Polarization diversity optical heterodyne coherent reception system and described polarization diversity optical heterodyne that testing fiber is connected with described testing fiber
Photodetector and described photodetection that the fiber coupler that coherent reception system connects is connected with described fiber coupler
Signal processing unit and the servicing unit being connected with described signal processing unit that device connects, described interference system includes and institute
State the stationary mirror that is connected with described Michelson's interferometer of Michelson's interferometer of semiconductor laser connection and put
In the reference mirror of testing fiber side, described stationary mirror is fixedly connected with testing fiber, outside described polarization diversity light
Difference coherent reception system include acousto-optic frequency shifters aofs, polarization-maintaining coupler pmc, one group of polarization beam apparatus, one group of balance receiver,
One group of bandpass filter, summing circuit and low pass filter lpf, described polarization beam apparatus include the first polarization beam apparatus pbs1 and
Second polarization beam apparatus pbs2, described balance receiver includes the first balance receiver and the second balance receiver, described band logical
Wave filter includes the first bandpass filter bpf1 and the second bandpass filter bpf2, described testing fiber and acousto-optic frequency shifters aofs
It is respectively connecting to described polarization-maintaining coupler pmc input, it is inclined that described polarization-maintaining coupler pmc output end is respectively connecting to described first
Shake beam splitter pbs1 input and the second polarization beam apparatus pbs2 input, and described first polarization beam apparatus pbs1 output end connects
Described first balance receiver input, it is defeated that described first balance receiver output end connects described first bandpass filter bpf1
Enter end, described second polarization beam apparatus pbs2 output end connects described second balance receiver input, described second balance connects
Receive device output end and connect described second bandpass filter bpf2 input, described first bandpass filter bpf1 output end and second
Bandpass filter bpf2 output end is respectively connecting to described summing circuit input, and described summing circuit output end connects to described
Low pass filter lpf input.
Further, including power-supply system, described power-supply system provides power supply for the system, provides power supply to be that this patent carries
For system worked well primary condition.
Further, described servicing unit includes warning device, malfunction indicator lamp and display device.
Further, including master clock and the impulse generator that is connected with described master clock, described impulse generator with
Described semiconductor laser input connects.
Further, including counting module, described counting module includes receiving circuit, amplification and rectification circuit, counter electricity
Road, display module and control circuit.
The utility model compared with the prior art, is had the advantage, that and is adopted based on the measuring system that optical coherence is interfered
Polarization diversity optical heterodyne coherent reception system, mainly solves two problems, the multiple interference problem in one measurement, its two-phase
Polarization decay problem in dry detection, thus the detection sensitivity that improve.
Brief description
Fig. 1 be the utility model proposes based on optical coherence interfere measuring system general structure schematic diagram.
Fig. 2 is the structural representation of the polarization diversity optical heterodyne coherent reception system of the measuring system interfered based on optical coherence
Figure.
Specific embodiment
With reference to the accompanying drawings and detailed description, it is further elucidated with the utility model it should be understood that following specific embodiment party
Formula is merely to illustrate the utility model rather than limits scope of the present utility model.
As shown in figure 1, a kind of measuring system based on optical coherence interference, partly lead with described including semiconductor laser
The interference system that body laser connects, the testing fiber being connected with described interference system, the polarization being connected with described testing fiber
Diversity optical heterodyne coherent reception system, the fiber coupler being connected with described polarization diversity optical heterodyne coherent reception system, with institute
State fiber coupler connection the signal processing unit that is connected with described photodetector of photodetector and with described signal
The servicing unit that processing unit connects, described semiconductor laser input connects impulse generator, and described impulse generator is defeated
Enter end and connect master clock, master clock produces standard clock signal to impulse generator, and impulse generator is believed according to this standard time clock
Number produce satisfactory burst pulse, and use this burst pulse semiconductor laser modulation light source, semiconductor laser send light believe
Number to light direction interference system, Michelson's interferometer that described interference system includes being connected with described semiconductor laser,
The stationary mirror being connected with described Michelson's interferometer and the reference mirror being placed in testing fiber side, described fixation
Speculum is fixedly connected with testing fiber, and when stationary mirror moves with testing fiber, the optical path difference of two-way light beam just occurs
Change, interference fringe also will invent dark alternately change, and optical signal is divided into two bundles by this interference system, and wherein light beam is through described
Stationary mirror returns, and its light path is fixing, referred to as fixes light, another light beam then enters testing fiber, due to testing fiber
There is the microinhomogeneities of refractive index, Rayleigh scattering can be produced, rear orientation light meets fiber numerical aperture and injection end returns
Return, referred to as flashlight, if spread length meets the coherent condition of light, flashlight and reference light pass through the second fiber coupler
Enter in the photodetector of trouble analysis system and be mixed on the photosurface of photodetector, photodetector is just
The photoelectric current of corresponding frequencies can be exported, thus obtaining the scatter attenuation characteristic everywhere along testing fiber, simultaneously can be by test
The maximum of frequency deduces the length of testing fiber, along the length of testing fiber scatter attenuation characteristic everywhere and testing fiber
The measurement data such as degree eventually pass the signal processing unit processes being connected with described photodetector, after signal processing unit processes
Signal be sent in servicing unit, servicing unit includes warning device, malfunction indicator lamp and display device, warning device and therefore
Barrier indicator lamp is used for fault alarm, and display device is used for showing detection data information and result；
With reference to Fig. 2, described polarization diversity optical heterodyne coherent reception system includes acousto-optic frequency shifters aofs, polarization-maintaining coupler
Pmc, one group of polarization beam apparatus, one group of balance receiver, one group of bandpass filter, summing circuit and low pass filter lpf, described
Polarization beam apparatus include the first polarization beam apparatus pbs1 and the second polarization beam apparatus pbs2, and it is flat that described balance receiver includes first
Weighing apparatus receiver and the second balance receiver, described bandpass filter includes the first bandpass filter bpf1 and the second bandpass filter
Bpf2, described testing fiber and acousto-optic frequency shifters aofs are respectively connecting to described polarization-maintaining coupler pmc input, the inclined coupling of described guarantor
Clutch pmc output end is respectively connecting to described first polarization beam apparatus pbs1 input and the second polarization beam apparatus pbs2 input
End, described first polarization beam apparatus pbs1 output end connects described first balance receiver input, described first balance reception
Device output end connects described first bandpass filter bpf1 input, and described second polarization beam apparatus pbs2 output end connects described
Second balance receiver input, described second balance receiver output end connects described second bandpass filter bpf2 input
End, described first bandpass filter bpf1 output end and the second bandpass filter bpf2 output end are respectively connecting to described summation electricity
Road input, described summing circuit output end connects to described low pass filter lpf input, and acousto-optic frequency shifters will be with reference to optical frequency
Skew 20mhz, thus realizing optical heterodyne detection, overcomes multiple interference problem, and by the optical signal after skew and fiber-optic signal light
It is input in polarization-maintaining coupler, eventually pass low pass filter lpf output, last low pass filter lpf output signal and letter
Number polarization state face, show this polarization diversity optical heterodyne coherent reception system for this patent propose detecting system in when,
This detection mode is unrelated with polarization, thus overcoming the problem of polarization decay.
What this patent proposed also includes counting module based on the measuring system that optical coherence is interfered, and described counting module includes
Receiving circuit, amplification and rectification circuit and counter circuit, described counting module is connected with described signal processing unit, described counting
Module includes receiving circuit, amplification and rectification circuit, counter circuit, display module and control circuit, and pulse signal is through counting
Module, described receiving circuit main task is receipt signal, then output voltage signal, and amplification and rectification circuit is mainly used in electricity
Signal amplifies the rear better normal operation of circuit below to a certain extent, and counter circuit is the core of whole counting module
Part, it is used for return pulse signal and exports binary number, the binary number that counter is exported through the running of internal trigger
7 sections of show code signals being translated into touch the numeral that each end of charactron shows remembered pulse number, and control circuit is used for counting
The work of circuit produces set and reset, finally by display module it is observed that moving striation number, is become by interference fringe
The measurement changed just can measure testee.
What this patent proposed also includes power-supply system based on the measuring system that optical coherence is interfered, and described power-supply system is this
System provides power supply.
Technological means disclosed in the utility model scheme is not limited only to the technological means disclosed in above-mentioned embodiment, also
Including by the formed technical scheme of above technical characteristic any combination.It should be pointed out that the ordinary skill for the art
For personnel, on the premise of without departing from the utility model principle, some improvements and modifications can also be made, these improve and moisten
Decorations are also considered as protection domain of the present utility model.
Claims (5)
1. a kind of measuring system based on optical coherence interference it is characterised in that: include semiconductor laser and described semiconductor
The polarization that the testing fiber that the interference system that laser instrument connects is connected with described interference system is connected with described testing fiber divides
The collection fiber coupler that is connected with described polarization diversity optical heterodyne coherent reception system of optical heterodyne coherent reception system with described
The signal processing unit that is connected with described photodetector of photodetector that fiber coupler connects and with described signal at
The servicing unit that reason unit connects, Michelson's interferometer that described interference system includes being connected with described semiconductor laser,
The stationary mirror being connected with described Michelson's interferometer and the reference mirror being placed in testing fiber side, described fixation
Speculum is fixedly connected with testing fiber, and described polarization diversity optical heterodyne coherent reception system includes acousto-optic frequency shifters aofs, guarantor
Partially coupler pmc, one group of polarization beam apparatus, one group of balance receiver, one group of bandpass filter, summing circuit and low pass filter
Lpf, described polarization beam apparatus include the first polarization beam apparatus pbs1 and the second polarization beam apparatus pbs2, described balance receiver bag
Include the first balance receiver and the second balance receiver, described bandpass filter includes the first bandpass filter bpf1 and second band
Bandpass filter bpf2, described testing fiber and acousto-optic frequency shifters aofs are respectively connecting to described polarization-maintaining coupler pmc input, institute
State polarization-maintaining coupler pmc output end and be respectively connecting to described first polarization beam apparatus pbs1 input and the second polarization beam apparatus
Pbs2 input, the described first polarization beam apparatus pbs1 output end described first balance receiver input of connection, described first
Balance receiver output end connects described first bandpass filter bpf1 input, described second polarization beam apparatus pbs2 output end
Connect described second balance receiver input, described second balance receiver output end connects described second bandpass filter
Bpf2 input, described first bandpass filter bpf1 output end and the second bandpass filter bpf2 output end are respectively connecting to institute
State summing circuit input, described summing circuit output end connects to described low pass filter lpf input.
2. the measuring system based on optical coherence interference according to claim 1 it is characterised in that: include power-supply system,
Described power-supply system provides power supply for the system.
3. the measuring system based on optical coherence interference according to claim 1 it is characterised in that: described servicing unit bag
Include warning device, malfunction indicator lamp and display device.
4. the measuring system based on optical coherence interference according to claim 1 it is characterised in that: include master clock and
The impulse generator being connected with described master clock, described impulse generator is connected with described semiconductor laser input.
5. the measuring system based on optical coherence interference according to claim 1 it is characterised in that: include counting module,
Described counting module includes receiving circuit, amplification and rectification circuit, counter circuit, display module and control circuit, described counting
Module is connected with described signal processing unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620650511.2U CN205909835U (en) | 2016-06-27 | 2016-06-27 | Measurement system based on optics is relevant interferes |
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| CN201620650511.2U CN205909835U (en) | 2016-06-27 | 2016-06-27 | Measurement system based on optics is relevant interferes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106017513A (en) * | 2016-06-27 | 2016-10-12 | 江苏骏龙光电科技股份有限公司 | Measurement system based on optical coherent interference |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106017513A (en) * | 2016-06-27 | 2016-10-12 | 江苏骏龙光电科技股份有限公司 | Measurement system based on optical coherent interference |
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