CN110375781A - The self-adapting data acquisition system of variable measurement range in a kind of OFDR - Google Patents
The self-adapting data acquisition system of variable measurement range in a kind of OFDR Download PDFInfo
- Publication number
- CN110375781A CN110375781A CN201910688633.9A CN201910688633A CN110375781A CN 110375781 A CN110375781 A CN 110375781A CN 201910688633 A CN201910688633 A CN 201910688633A CN 110375781 A CN110375781 A CN 110375781A
- Authority
- CN
- China
- Prior art keywords
- interferometer
- fiber
- beat signal
- fiber optic
- optical path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005259 measurement Methods 0.000 title claims abstract description 29
- 238000002168 optical frequency-domain reflectometry Methods 0.000 title claims abstract 6
- 239000000835 fiber Substances 0.000 claims abstract description 115
- 230000003287 optical effect Effects 0.000 claims abstract description 70
- 238000012545 processing Methods 0.000 claims abstract description 13
- 238000010408 sweeping Methods 0.000 claims description 22
- 230000035559 beat frequency Effects 0.000 claims description 17
- 239000013307 optical fiber Substances 0.000 claims description 17
- 230000005693 optoelectronics Effects 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 241000931526 Acer campestre Species 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 4
- 238000012369 In process control Methods 0.000 claims 1
- 238000013481 data capture Methods 0.000 claims 1
- 238000010965 in-process control Methods 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 4
- 230000003044 adaptive effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 241001269238 Data Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003739 neck Anatomy 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35303—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using a reference fibre, e.g. interferometric devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35325—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using interferometer with two arms in reflection, e.g. Mickelson interferometer
Abstract
The invention discloses a kind of self-adapting data acquisition system of variable measurement range in OFDR, packet frequency swept laser, fiber optic splitter, main interferometer, auxiliary interferometer, data collecting card, computers.One adjustable optical path of light path of auxiliary interferometer, according to the range of main interferometer, it adjusts twice that adjustable optical path light path is at least main interferometer optical path light path, by auxiliary interferometer generate the second beat signal the first beat signal with measuring signal that main interferometer generates is sampled as the external clock of high-speed data acquisition card, realization to the first beat signal it is adaptive, etc. frequency domain samples.The present invention is logical greatly to optimize computer resource required for OFDR device data processing, and processing speed is multiplied, and structure is simple, easy to adjust, can more preferably be suitable for optic communication measurement, distributed temperature strain measurement field.
Description
Technical field
The present invention relates to a kind of self-adapting datas of variable measurement range in technical field of optical fiber sensing more particularly to OFDR
Acquisition system.
Background technique
Optical frequency domain reflection technology (OFDR) is a kind of emerging distribution type fiber-optic measurement sensing technology, anti-with traditional optical time domain
It penetrates technology (OTDR) to compare, has many advantages, such as that measurement accuracy is high, spatial resolution is high.OFDR technology in optic communication fields of measurement,
Return loss at each position of optical fiber link, Insertion Loss can accurately be measured；In distributed sensing field, strained since OFDR is measured,
The precision of temperature is high, and spatial resolution is high (up to 1mm), in necks such as civil engineering, vehicle electrical power, composite material detections
Domain is widely used.
For OFDR compared with conventional OTDR technique, maximum advantage is spatial resolution height.System based on OTDR technique,
Spatial discrimination is generally in rice magnitude, and the system based on OFDR, spatial resolving power are other in the micron-scale.Just because of the space OFDR
This feature of high resolution, so that the original data volume of OFDR is big.By taking 100 meters of measurement length, 10um spatial resolutions as an example, most
The data volume shown eventually is exactly 10,000,000 points.And initial data is several times even tens times of final result data volume.Therefore former
The calculating of beginning data volume consumes the vast resources of computer while elapsed time is also longer.
The maximum measurement distance of OFDR is determined by the auxiliary interferometer length of internal system.It can by Shaimon Sampling Theorem
Know, in order to restore analog signal without distortion, sample frequency should be not less than 2 times of highest frequency in analog signal frequency spectrum.Cause
For in OFDR system, auxiliary interferometer is as the optical path of building external clock, and the frequency of external clock is sample frequency,
Maximum frequency is determined by the arm difference of Michelson's interferometer, and therefore, the detectable maximum frequency of system is that auxiliary interferometer produces
The half of raw clock, i.e. auxiliary interferometer length are one times of the maximum detection range of system.
Since the data of OFDR system acquisition are that equal frequency intervals sample on frequency domain, acquisition system is collected
Data are all data of maximum detection range.When the data at user only needs one section of front fiber position, acquisition system
System still all collects all data of the optical fiber of entire maximum detection range in system, this has resulted in whole system
Data volume is huge, and waste computer resource, arithmetic speed are also decreased obviously.In addition, reaching a kilometer rank when testing fiber is too long
When, the delay coil inside auxiliary interferometer is also corresponding elongated, and coil production is complicated, and it is at high cost, need a device to carry out structure
Build the delay of long range optical path.
Summary of the invention
The technical problem to be solved in the present invention is that effectively can not adaptively wait frequency domains for data sampling in the prior art
The defect of sampling provides a kind of adjustable OFDR self-adapting data acquisition system of measurement range.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of self-adapting data acquisition system of variable measurement range in OFDR is provided, which includes:
Frequency swept laser, for issuing the sweeping laser of optical maser wavelength periodicity linear change；
Fiber optic splitter respectively enters auxiliary interferometer and main interferometer for sweeping laser to be divided into two-way；
Main interferometer, for making the sweeping laser into the main interferometer that beat frequency interference occur, generating includes measured signal
The first beat signal；
Auxiliary interferometer, it is adjustable including the fixed optical path of a light path and an adjustable optical path of light path, light path
Range is at least twice of the main interferometer optical path light path, for the sweeping laser into the auxiliary interferometer to occur
Beat frequency interference, generates the second beat signal, and the maximum frequency of second beat signal is at least first beat signal most
Twice of big frequency, external clock of second beat signal after conversion as high-speed data acquisition card；
Data collecting card, external clock for being generated according to second beat signal to first beat signal into
Row sampling；
Computer carries out processing analysis to the signal after sampling, while controlling the auxiliary interferometer to light path tunable optical
The light path on road is adjusted.
Above-mentioned technical proposal is connect, the main interferometer is the adjustable interferometer of OFDR measurement range, including the first optical fiber coupling
Clutch, optical fiber circulator and the second fiber coupler, in the first fiber coupler branch end all the way with the fiber optic loop
The port a of row device connects, the port b and the port c of the fiber optical circulator respectively with the testing fiber device and described second
Fiber coupler connects to form optical path, the another way in the first fiber coupler branch end and the second optical fiber coupling
Clutch connects to form reference path, and the optical signal of the optical path and the reference path is at second fiber coupler
Beat frequency interference occurs and forms first beat signal.
10. the system as claimed in claim 1, which is characterized in that the adjustable optical path of light path in the auxiliary interferometer
Include:
Two reflecting mirrors being parallel to each other, a reflecting mirror are fixed on a bottom plate, and it is automatically controlled that another reflecting mirror is mounted on one
On displacement platform, the distance between two reflecting mirrors are adjusted by controlling automatically controlled displacement platform；
Beam incident angle degree adjuster, including the first electronic rotation fixture and the first fiber optic collimator mirror, described first is electronic
First fiber optic collimator mirror, first fiber optic collimator mirror and the 4th fiber coupler port d are set on rolling clamp
Connection is entered for light beam to be incident between two reflecting mirrors by controlling the adjustable light beam of the first electronic rotation fixture
Firing angle degree；
End-reflector, including the second electronic rotation fixture, the second fiber optic collimator mirror and the second Faraday mirror, it is described
Second fiber optic collimator mirror is set on the second electronic rotation fixture, the second faraday rotation is connected after second fiber optic collimator mirror
Light microscopic, the second electronic rotation fixture are set on the automatically controlled displacement platform, by controlling the second electronic rotation fixture
The pose for adjusting second fiber optic collimator mirror makes incident second fiber optic collimator mirror of the reflected beams between two reflecting mirrors,
And by making light beam by the first fiber optic collimator mirror described in backtracking after the second Faraday mirror.
Above-mentioned technical proposal is connect, the adjustable optical path of light path includes the first optoelectronic switch, second in the auxiliary interferometer
Optoelectronic switch is arranged between multiple groups fiber optic coils, and third Faraday mirror is connected with after second optoelectronic switch, described more
The group number of group fiber optic coils and the optional measuring range of main interferometer are corresponding, and the length of every group of fiber optic coils is at least the trunk
Interferometer corresponds to twice of measuring range optical path length, and the computer controls first light according to the measuring range of main interferometer
The light path of electric switch and the second optoelectronic switch selection adjustable optical path of auxiliary interferometer.
Above-mentioned technical proposal is connect, the computer connects the data collecting card, and the data collecting card connects the first light
Electric explorer, the second photodetector and third photodetector, first photodetector is to first beat signal
Photoelectric conversion is carried out, the signal after photoelectric conversion carries out signal acquisition by data collecting card, and the third photodetector is to auxiliary
Space optical path coupling result in interferometer is helped to monitor, the second count that second photodetector generates auxiliary interferometer
The external clock after photoelectric conversion as the fast data collecting card of frequency signal.
Connecing above-mentioned technical proposal, the fiber optic splitter is 1 × 2 fiber optic splitter, and fiber beam splitting ratio is 20:80,80%
Light enter main interferometer, 20% light enters auxiliary interferometer.
Above-mentioned technical proposal is connect, the frequency swept laser is narrow linewidth laser, and swept frequency range is C+L wave band, maximum defeated
Power is greater than 10mW out, and sweep velocity maximum is up to 2000nm/s, and scanning speed jitter range is less than 5%.
Above-mentioned technical proposal is connect, the auxiliary interferometer includes fibre optic isolater, third fiber coupler, the 4th optical fiber coupling
Clutch and the first Faraday mirror, the port a of the third fiber coupler connect the fibre optic isolater, the connection of the port b
Second photodetector, the port c connect the first Faraday mirror, and the port d connects the 4th fiber coupler
The port a, the port b of the 4th fiber coupler connects the third photodetector, the d of the 4th fiber coupler
Port connects first fiber optic collimator mirror or first optoelectronic switch.
Above-mentioned technical proposal is connect, the third fiber coupler is 2x2 single mode optical fiber beam splitter, splitting ratio 20:80, institute
Stating the 4th fiber coupler is 2x2 single mode optical fiber beam splitter, splitting ratio 1:99.
A kind of self-adapting data acquisition method of variable measurement range in OFDR is provided, comprising the following steps:
Auxiliary interferometer is made by the regulating mechanism of computer regulated auxiliary interferometer according to the range of main interferometer
The light path of adjustable optical path is at least twice of main interferometer optical path light path；
The sweeping laser for generating optical maser wavelength periodicity linear change, is divided into two for sweeping laser by fiber optic splitter
Road respectively enters auxiliary interferometer and main interferometer；
Beat frequency interference occurs for the sweeping laser into the main interferometer, generates the first beat signal comprising measured signal；
Beat frequency interference occurs for the sweeping laser into the auxiliary interferometer, generates the second beat signal, second beat frequency
The maximum frequency of signal is at least twice of the first beat signal maximum frequency, and second beat signal is after conversion
External clock as high-speed data acquisition card；
The external clock that the data collecting card is generated according to second beat signal to first beat signal into
Row sampling；
Computer carries out processing analysis to the signal after sampling, parses measuring signal.
The beneficial effect comprise that: the self-adapting data of variable measurement range in a kind of OFDR provided by the invention
Acquisition system, by auxiliary interferometer generate the second beat signal as high-speed data acquisition card external clock to main interference
The first beat signal with measuring signal that instrument generates is sampled, equal frequency domain samples of the realization to the first beat signal.It is auxiliary
Helping interferometer includes an adjustable optical path, and can control its optical path adjusting institutional adjustment by computer according to the range of main interferometer can
The light path on light modulation road is at least twice of main interferometer optical path light path, to realize self-adapting data acquisition.The present invention
Oneself of main interferometer beat signal is realized by the external clock that the auxiliary interferometer with adjustable optical path generates data collecting card
Acquisition is adapted to, to greatly optimize computer resource required for OFDR device data processing, processing speed is multiplied,
Structure is simple, easy to adjust, can more preferably be suitable for optic communication measurement, distributed temperature strain measurement field.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the structural schematic diagram of an embodiment of the present invention device；
Fig. 2 is the structural schematic diagram of another embodiment device of the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
As shown in Figure 1, in a kind of OFDR of the embodiment of the present invention variable measurement range self-adapting data acquisition system, packet
Frequency swept laser 1, fiber optic splitter 2, main interferometer 3, auxiliary interferometer 4, data collecting card 6, computer 5.Frequency swept laser 1
The sweeping laser for issuing optical maser wavelength periodicity linear change divides for two-way through fiber optic splitter 2, respectively enters auxiliary interferometer
And main interferometer；Main interferometer 3 makes the sweeping laser into the main interferometer that beat frequency interference occur, and generates comprising measured signal
First beat signal；Auxiliary interferometer 4 includes the fixed optical path and an adjustable optical path of light path of a light path, and light path is adjustable
The range of section is at least twice of 3 optical path light path of main interferometer, for sending out the sweeping laser into the auxiliary interferometer 4
Raw beat frequency interference, generates the second beat signal, and the maximum frequency of second beat signal is at least the maximum frequency of the first beat signal
Twice of rate, external clock of second beat signal after conversion as high-speed data acquisition card 6.
Data collecting card 6 samples the first beat signal according to the external clock that the second beat signal generates, sampling
Signal afterwards carries out processing analysis by computer 5, and computer 5 controls auxiliary interferometer 4 to the light of the adjustable optical path of light path simultaneously
Journey is adjusted.
Further, main interferometer 3 be the adjustable interferometer of OFDR measurement range, measurement range selection gear can have 5m,
10m,20m,50m,100m,200m,500m,1000m,2000m.Including the first fiber coupler 31, optical fiber circulator 32 and
Two fiber couplers 33, being connect all the way with the port a of fiber optical circulator 32 in first fiber coupler, 31 branch end, fiber optic loop
The port b and the port c of row device 32 connect with testing fiber device 34 and the second fiber coupler 33 respectively and to form optical path, the
Another way in one fiber coupler, 31 branch end connect to form reference path with the second fiber coupler 33, optical path and ginseng
Beat frequency interference occurs at the second fiber coupler 33 and forms the first beat signal for the optical signal for examining optical path.
Further, as shown in Figure 1, the adjustable optical path of light path includes: in auxiliary interferometer 4
Two reflecting mirrors being parallel to each other, a reflecting mirror 453 are fixed on negative, and another reflecting mirror 455 is mounted on electricity
It controls on displacement platform 454, the distance between automatically controlled 454 adjustable two reflecting mirrors of displacement platform is controlled by computer 5, by right
The multiple reflections of incident light realize the adjusting of light path, realize that structure is simple, flexible adjustment.
Beam incident angle degree adjuster, is arranged the first fiber optic collimator mirror 451 on the first electronic rotation fixture 452, and first
Fiber optic collimator mirror 451 is connect with 44 port d of the 4th fiber coupler, for light beam to be incident between two reflecting mirrors, the first electricity
452 maximum rotatable 90 degree of dynamic rolling clamp, by controlling the adjustable beam incident angle degree of the first electronic rotation fixture 452,
By adjusting order of reflection of the adjustable incident light of beam incident angle between two reflecting mirrors.
The second fiber optic collimator mirror 457, the second fiber optic collimator is arranged in end-reflector on the second electronic rotation fixture 456
The second Faraday mirror 458 is connected after mirror 457, the second electronic rotation fixture 457 is set on automatically controlled displacement platform 454, and second
Maximum rotatable 90 degree of electronic rotation fixture 456, and can be translated according to automatically controlled position platform 454, pass through control the second electronic rotation folder
Have the pose of 456 adjustable second fiber optic collimator mirrors 457, makes incident second fiber optic collimator of the reflected beams between two reflecting mirrors
Mirror 457, and by making light beam by the first fiber optic collimator mirror of backtracking 451 after the second Faraday mirror 458, realize optical path light
The adjusting of journey.
Further, as shown in Fig. 2, in auxiliary interferometer 4 the adjustable optical path of light path include the first optoelectronic switch 461,
Second optoelectronic switch 463 is arranged between multiple groups fiber optic coils 462, is connected with third Faraday after the second optoelectronic switch 463
Mirror 464, the group number of multiple groups fiber optic coils 462 and the optional measuring range of main interferometer 3 are corresponding, the length of every group of fiber optic coils 462
Degree is at least twice of the corresponding measuring range optical path length of main interferometer 3, and computer 5 is according to the measuring range control of main interferometer 3
Make the light path of the first optoelectronic switch 461 and the second optoelectronic switch 463 selection adjustable optical path of auxiliary interferometer 4.
Further, computer 5 controls the regulating mechanism of the light path path adjustable optical of auxiliary interferometer 4, and is connected with height
Fast data collecting card 6 realizes and carries out processing analysis to the data that high-speed data acquisition card 6 acquires, high-speed data acquisition card 6 connects
First photodetector 61, the second photodetector 62 and third photodetector 63, the first photodetector 61 realize first
The photoelectric conversion of beat signal simultaneously carries out signal acquisition by data collecting card 6, and third photodetector 63 realizes auxiliary interferometer 4
Middle space optical path coupling result monitoring, the second photodetector 62 realize the light for the second beat signal that auxiliary interferometer 4 generates
Electricity conversion forms the external clock of high-speed data acquisition card 6.
Further, fiber optic splitter 2 is 1 × 2 fiber optic splitter, and fiber beam splitting ratio is 20:80, and 80% light enters master
Interferometer 3,20% light enter auxiliary interferometer 4.
Further, frequency swept laser 1 is narrow linewidth laser, and swept frequency range is C+L wave band, and peak power output is greater than
10mW, sweep velocity maximum is up to 2000nm/s, and scanning speed jitter range is less than 5%.
Further, auxiliary interferometer 4 includes fibre optic isolater 41, third fiber coupler 42, the 4th fiber coupler
44 and the first Faraday mirror 43, the port a of third fiber coupler 42 connect fibre optic isolater 21, the port b connection second
Photodetector 62, the port c connect the first Faraday mirror 43, form the fixed optical path of auxiliary interferometer 4, the connection of the port d
The port b of the port a of 4th fiber coupler 44, the 4th fiber coupler 44 connects third photodetector 42, the 4th optical fiber
The port d of coupler 44 connects the first fiber optic collimator mirror 451 or the first optoelectronic switch 461.
Further, third fiber coupler 42 is 2x2 single mode optical fiber beam splitter, and splitting ratio 20:80,20% enters admittedly
Determine the optical path of light path, 80% enters the optical path of adjustable light path, and the 4th fiber coupler 44 is 2x2 single mode optical fiber beam splitter, beam splitting
Than entering third photodetector 63 as the monitoring of space optical path coupled structure for 1:99,1%, 99%, which enters light path, is adjusted light
Road, the beat signal of auxiliary interferometer 4 generate at third fiber coupler 42.
A kind of self-adapting data acquisition method of variable measurement range in OFDR is provided, comprising the following steps:
According to the range of main interferometer 3, the regulating mechanism of auxiliary interferometer 4 is adjusted by computer 5, makes auxiliary interferometer
The light path of 4 adjustable optical path is at least twice of 3 optical path light path of main interferometer；
Frequency swept laser 1 generates the sweeping laser of optical maser wavelength periodicity linear change, by fiber optic splitter 2 by frequency sweep
Laser is divided into two-way, respectively enters auxiliary interferometer 4 and main interferometer 3；
Beat frequency interference occurs for the sweeping laser into the main interferometer 3, generates the first beat signal comprising measured signal；
Beat frequency interference occurs for the sweeping laser into the auxiliary interferometer 4, generates the second beat signal, second beat frequency
The maximum frequency of signal is at least twice of the first beat signal maximum frequency, and second beat signal is after conversion
External clock as high-speed data acquisition card 6；
The external clock that data collecting card 6 is generated according to second beat signal adopts first beat signal
Sample；
Signal after 5 pairs of computer samplings carries out processing analysis, parses measuring signal.
To sum up, in a kind of OFDR proposed by the present invention variable measurement range self-adapting data acquisition system and method, adopt
The beat signal for using auxiliary interferometer 4 to generate realizes the beat signal of main interferometer 3 as the external clock of data collecting card
Equal frequency intervals sampling, and the beat signal that auxiliary interferometer 4 generates can carry out adaptively according to the range of main interferometer 3
It adjusts, to greatly optimize computer resource required for data processing, processing data speed is also multiplied.Knot of the present invention
Structure is simple, adjusts simply, can more preferably be suitable for optic communication measurement, distributed temperature strain measurement field.
As it will be easily appreciated by one skilled in the art that accompanying drawings and embodiments described herein are only to illustrate the technology of the present invention
Scheme rather than its limitations, it is all do not depart from the present invention program spirit and principle within it is made it is any modification, equivalent replacement and
Improve etc., it should all cover within the scope of the technical scheme claimed by the invention.
Claims (10)
1. the self-adapting data acquisition system of variable measurement range in a kind of OFDR, which is characterized in that the system includes:
Frequency swept laser, for issuing the sweeping laser of optical maser wavelength periodicity linear change；
Fiber optic splitter respectively enters auxiliary interferometer and main interferometer for sweeping laser to be divided into two-way；
Main interferometer generates the comprising measured signal for making the sweeping laser into the main interferometer that beat frequency interference occur
One beat signal；
Auxiliary interferometer, including the optical path and an adjustable optical path of light path that a light path is fixed, the adjustable range of light path
Twice of at least described main interferometer optical path light path, for making the sweeping laser into the auxiliary interferometer that beat frequency occur
Interference, generates the second beat signal, and the maximum frequency of second beat signal is at least the maximum frequency of first beat signal
Twice of rate, external clock of second beat signal after conversion as high-speed data acquisition card；
Data collecting card, the external clock for being generated according to second beat signal adopt first beat signal
Sample；
Computer carries out processing analysis to the signal after sampling, while controlling the auxiliary interferometer to the adjustable optical path of light path
Light path is adjusted.
2. the system as claimed in claim 1, which is characterized in that the main interferometer is the adjustable interference of OFDR measurement range
Instrument, including the first fiber coupler, optical fiber circulator and the second fiber coupler, in the first fiber coupler branch end
Connect all the way with the port a of the fiber optical circulator, the port b and the port c of the fiber optical circulator respectively with the light to be measured
Fiber device connects to form optical path with second fiber coupler, the another way in the first fiber coupler branch end
It connect to form reference path with second fiber coupler, the optical signal of the optical path and the reference path is described
Beat frequency interference occurs at second fiber coupler and forms first beat signal.
3. the system as claimed in claim 1, which is characterized in that the adjustable optical path of light path includes: in the auxiliary interferometer
Two reflecting mirrors being parallel to each other, a reflecting mirror are fixed on a bottom plate, and another reflecting mirror is mounted on an automatically controlled displacement
On platform, the distance between two reflecting mirrors are adjusted by controlling automatically controlled displacement platform；
Beam incident angle degree adjuster, including the first electronic rotation fixture and the first fiber optic collimator mirror, first electronic rotation
First fiber optic collimator mirror is set on fixture, first fiber optic collimator mirror is connect with the 4th fiber coupler port d,
For light beam to be incident between two reflecting mirrors, by controlling the adjustable beam incident angle of the first electronic rotation fixture
Degree；
End-reflector, including the second electronic rotation fixture, the second fiber optic collimator mirror and the second Faraday mirror, described second
Second fiber optic collimator mirror is set on electronic rotation fixture, connects the second Faraday after second fiber optic collimator mirror
Mirror, the second electronic rotation fixture are set on the automatically controlled displacement platform, by controlling the second electronic rotation fixture tune
The pose for saving second fiber optic collimator mirror makes incident second fiber optic collimator mirror of the reflected beams between two reflecting mirrors, and
By making light beam by the first fiber optic collimator mirror described in backtracking after the second Faraday mirror.
4. the system as claimed in claim 1, which is characterized in that the adjustable optical path of light path includes the in the auxiliary interferometer
One optoelectronic switch, the second optoelectronic switch are arranged between multiple groups fiber optic coils, are connected with third farad after second optoelectronic switch
Polariscope, the group number of the multiple groups fiber optic coils and the optional measuring range of main interferometer are corresponding, the length of every group of fiber optic coils
Degree is at least the main interferometer and corresponds to twice of measuring range optical path length, and the computer is according to the measurement amount of main interferometer
The light path of first optoelectronic switch described in process control and the second optoelectronic switch selection adjustable optical path of auxiliary interferometer.
5. the system as claimed in claim 1, which is characterized in that the computer connects the data collecting card, the data
Capture card connects the first photodetector, the second photodetector and third photodetector, first photodetector pair
First beat signal carries out photoelectric conversion, and the signal after photoelectric conversion carries out signal acquisition by data collecting card, and described the
Three photodetectors monitor space optical path coupling result in auxiliary interferometer, and second photodetector is by auxiliary interferometer
The external clock after photoelectric conversion as the fast data collecting card of second beat signal generated.
6. the system as claimed in claim 1, which is characterized in that the fiber optic splitter is 1 × 2 fiber optic splitter, optical fiber point
Beam ratio is 20:80, and 80% light enters main interferometer, and 20% light enters auxiliary interferometer.
7. the system as claimed in claim 1, which is characterized in that the frequency swept laser is narrow linewidth laser, swept frequency range
For C+L wave band, peak power output is greater than 10mW, and sweep velocity maximum is less than up to 2000nm/s, scanning speed jitter range
5%。
8. system as described in claim 3 or 4, which is characterized in that the auxiliary interferometer further includes fibre optic isolater, third
Fiber coupler, the 4th fiber coupler and the first Faraday mirror, the third fiber coupler the port a connection described in
Fibre optic isolater, the port b connect second photodetector, and the port c connects the first Faraday mirror, and the port d connects
The port a of the 4th fiber coupler is connect, the port b of the 4th fiber coupler connects the third photodetector,
The port d of 4th fiber coupler connects first fiber optic collimator mirror or first optoelectronic switch.
9. system as claimed in claim 8, which is characterized in that the third fiber coupler is 2x2 single mode optical fiber beam splitter,
Splitting ratio is 20:80, and the 4th fiber coupler is 2x2 single mode optical fiber beam splitter, splitting ratio 1:99.
10. the self-adapting data acquisition method of variable measurement range in a kind of OFDR, which comprises the following steps:
The adjustable of auxiliary interferometer is made by the regulating mechanism of computer regulated auxiliary interferometer according to the range of main interferometer
The light path of optical path is at least twice of main interferometer optical path light path；
The sweeping laser for generating optical maser wavelength periodicity linear change, is divided into two-way for sweeping laser by fiber optic splitter, point
It Jin Ru not auxiliary interferometer and main interferometer；
Beat frequency interference occurs for the sweeping laser into the main interferometer, generates the first beat signal comprising measured signal；
Beat frequency interference occurs for the sweeping laser into the auxiliary interferometer, generates the second beat signal, second beat signal
Maximum frequency be at least twice of the first beat signal maximum frequency, second beat signal conduct after conversion
The external clock of high-speed data acquisition card；
The external clock that the data collecting card is generated according to second beat signal adopts first beat signal
Sample；
Computer carries out processing analysis to the signal after sampling, parses measuring signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910688633.9A CN110375781B (en) | 2019-07-29 | 2019-07-29 | Adaptive data acquisition system with variable measurement range in OFDR (offset OFDR) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910688633.9A CN110375781B (en) | 2019-07-29 | 2019-07-29 | Adaptive data acquisition system with variable measurement range in OFDR (offset OFDR) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110375781A true CN110375781A (en) | 2019-10-25 |
| CN110375781B CN110375781B (en) | 2021-12-21 |
Family
ID=68256667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910688633.9A Active CN110375781B (en) | 2019-07-29 | 2019-07-29 | Adaptive data acquisition system with variable measurement range in OFDR (offset OFDR) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110375781B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749420A (en) * | 2019-09-12 | 2020-02-04 | 芯华创(武汉)光电科技有限公司 | OFDR detection device |
| CN111578971A (en) * | 2020-05-13 | 2020-08-25 | 武汉昊衡科技有限公司 | Device and method for realizing long-distance measurement by OFDR segmented acquisition |
| CN111756436A (en) * | 2020-07-13 | 2020-10-09 | 武汉昊衡科技有限公司 | Distributed insertion loss return loss measuring device and method in optical fiber communication |
| CN112129332A (en) * | 2020-08-20 | 2020-12-25 | 山东航天电子技术研究所 | Flexible multiplexing device of large-scale fiber grating sensor based on OFDR |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1719192A (en) * | 2005-06-23 | 2006-01-11 | 哈尔滨工业大学 | Bidimension photoelectric self collimating device based on optical length multiplication compensation method and its measuring method |
| KR100691871B1 (en) * | 2005-03-25 | 2007-03-12 | 광주과학기술원 | Apparatus and Method for Compensation of the Nonlinearity of an OFDR system |
| CN102221343A (en) * | 2011-06-03 | 2011-10-19 | 大连理工大学 | Quasi-distributed white light interference strain sensing system based on optical fiber full-spectrum reflectors with adjustable splitting ratios |
| CN102420650A (en) * | 2011-08-09 | 2012-04-18 | 天津大学 | Device and method for inhibiting nonlinear scanning of laser of optical frequency domain reflectometer |
| CN102997937A (en) * | 2012-12-12 | 2013-03-27 | 天津大学 | Light frequency domain reflecting device capable of inhibiting light source phase noises and demodulation method |
| CN104503081A (en) * | 2014-12-15 | 2015-04-08 | 哈尔滨工程大学 | Common optical path Fizeau interferometer type optical path correlator based on annular fiber mirror |
| CN107328429A (en) * | 2017-08-09 | 2017-11-07 | 武汉隽龙科技股份有限公司 | The device and method for closely sensing stability can be improved in optical frequency domain reflection technology |
| CN107576341A (en) * | 2017-08-09 | 2018-01-12 | 武汉隽龙科技股份有限公司 | The apparatus and method that polarization decay is eliminated in OFDR |
-
2019
- 2019-07-29 CN CN201910688633.9A patent/CN110375781B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100691871B1 (en) * | 2005-03-25 | 2007-03-12 | 광주과학기술원 | Apparatus and Method for Compensation of the Nonlinearity of an OFDR system |
| CN1719192A (en) * | 2005-06-23 | 2006-01-11 | 哈尔滨工业大学 | Bidimension photoelectric self collimating device based on optical length multiplication compensation method and its measuring method |
| CN102221343A (en) * | 2011-06-03 | 2011-10-19 | 大连理工大学 | Quasi-distributed white light interference strain sensing system based on optical fiber full-spectrum reflectors with adjustable splitting ratios |
| CN102420650A (en) * | 2011-08-09 | 2012-04-18 | 天津大学 | Device and method for inhibiting nonlinear scanning of laser of optical frequency domain reflectometer |
| CN102997937A (en) * | 2012-12-12 | 2013-03-27 | 天津大学 | Light frequency domain reflecting device capable of inhibiting light source phase noises and demodulation method |
| CN104503081A (en) * | 2014-12-15 | 2015-04-08 | 哈尔滨工程大学 | Common optical path Fizeau interferometer type optical path correlator based on annular fiber mirror |
| CN107328429A (en) * | 2017-08-09 | 2017-11-07 | 武汉隽龙科技股份有限公司 | The device and method for closely sensing stability can be improved in optical frequency domain reflection technology |
| CN107576341A (en) * | 2017-08-09 | 2018-01-12 | 武汉隽龙科技股份有限公司 | The apparatus and method that polarization decay is eliminated in OFDR |
Non-Patent Citations (2)
| Title |
|---|
| JINGJING XING等: "A Method Based on Time-Scale Factor for Correcting the Nonlinear Frequency Sweeping in an OFDR System", 《IEEE PHOTONICS JOURNAL》 * |
| 杜阳: "基于OFDR的分布式光纤多参量传感方法研究", 《中国博士学位论文全文数据库信息科技辑》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749420A (en) * | 2019-09-12 | 2020-02-04 | 芯华创(武汉)光电科技有限公司 | OFDR detection device |
| CN110749420B (en) * | 2019-09-12 | 2022-05-06 | 芯华创(武汉)光电科技有限公司 | OFDR detection device |
| CN111578971A (en) * | 2020-05-13 | 2020-08-25 | 武汉昊衡科技有限公司 | Device and method for realizing long-distance measurement by OFDR segmented acquisition |
| CN111578971B (en) * | 2020-05-13 | 2021-11-16 | 武汉昊衡科技有限公司 | Device and method for realizing long-distance measurement by OFDR segmented acquisition |
| CN111756436A (en) * | 2020-07-13 | 2020-10-09 | 武汉昊衡科技有限公司 | Distributed insertion loss return loss measuring device and method in optical fiber communication |
| CN111756436B (en) * | 2020-07-13 | 2021-05-04 | 武汉昊衡科技有限公司 | Distributed insertion loss return loss measuring device and method in optical fiber communication |
| CN112129332A (en) * | 2020-08-20 | 2020-12-25 | 山东航天电子技术研究所 | Flexible multiplexing device of large-scale fiber grating sensor based on OFDR |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110375781B (en) | 2021-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110375781A (en) | The self-adapting data acquisition system of variable measurement range in a kind of OFDR | |
| CN107764189B (en) | A kind of femtosecond laser Models of Absolute Distance Measurement Based device and method of a wide range of repetition modulation | |
| CN100580383C (en) | Embedded type multichannel high speed optical fiber grating sensor demodulation system | |
| CN101319878B (en) | Method and device for high-precision large-range measuring size of optical fiber | |
| CN107328429A (en) | The device and method for closely sensing stability can be improved in optical frequency domain reflection technology | |
| CN109959403B (en) | Multi-parameter large-capacity sensing system | |
| CN101825432A (en) | Dual-wavelength optical-fiber interference large-range high-resolution displacement measurement system | |
| CN103308144A (en) | Fiber Bragg grating vibration sensing measurement system and use method | |
| CN105333815B (en) | A kind of super online interferometer measuration system of lateral resolution surface three dimension based on the scanning of spectrum colour loose wire | |
| CN113503901B (en) | Device and method for eliminating measurement signal jitter of white light interferometer | |
| CN104535007A (en) | Distributed type optical fiber strain measurement system based on cavity-length-adjustable F-P white light interference demodulating device | |
| CN105444793A (en) | Fiber Bragg raster sensing device based on high-speed pulse laser | |
| CN106568382A (en) | On-line monitoring system and method for ultra-long fiber grating inscribing | |
| CN207147508U (en) | The device for closely sensing stability can be improved in optical frequency domain reflection technology | |
| CN101216327B (en) | High precision optical fiber grating sensing signal demodulation instrument | |
| CN204405012U (en) | The multiplexed accurate profile fiber strain measurement system of a kind of Low coherence | |
| CN209590271U (en) | A kind of measuring device of space length | |
| CN103454034B (en) | Optical fiber micrometric displacement air pressure measuring apparatus | |
| CN103033205A (en) | Fiber bragg grating interrogator based on digitization tunable light sources and method thereof | |
| CN101738167A (en) | Resonant cavity frequency stabilization-based absolute distance measurement system and implementing method thereof | |
| CN203929276U (en) | A kind of optical signal detecting disposal system based on resonance technique | |
| CN212539416U (en) | Real-time high-precision time delay sensing device and equipment based on optical fiber Doppler interference | |
| CN105674903A (en) | Measurement device and measurement method for measuring mirror spacing of lens assembly | |
| CN105953919A (en) | All-fiber Fourier expansion spectrum analyzer | |
| CN110375779A (en) | The device and method for improving OFDR frequency domain sample rate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210105 Address after: 430074 room 02, 9 / F, building 1, SBI Chuangye street, Dongxin Road, Donghu New Technology Development Zone, Wuhan City, Hubei Province Applicant after: Wuhan Haoheng Technology Co.,Ltd. Address before: No. 999, Gaoxin Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province, 430074 Applicant before: WUHAN JUNNO TECHNOLOGY Co.,Ltd. |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |