CN205538043U - Optic fibre interference type pressure sensor based on 3 take advantage of 3 couplers - Google Patents
Optic fibre interference type pressure sensor based on 3 take advantage of 3 couplers Download PDFInfo
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- CN205538043U CN205538043U CN201620340504.2U CN201620340504U CN205538043U CN 205538043 U CN205538043 U CN 205538043U CN 201620340504 U CN201620340504 U CN 201620340504U CN 205538043 U CN205538043 U CN 205538043U
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- 239000000835 fiber Substances 0.000 title claims abstract description 48
- 239000000523 sample Substances 0.000 claims abstract description 31
- 239000004065 semiconductor Substances 0.000 claims abstract description 11
- 239000003365 glass fiber Substances 0.000 claims description 45
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound 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Abstract
The utility model discloses an optic fibre interference type pressure sensor based on 3 take advantage of 3 couplers, it is by semiconductor laser, the isolator, the parallel arrangement 33 coupler, light conducting fiber, optic fibre is referred to around ring, faraday's rotating mirror, photoelectric detector, host computer demodulalation system component to the pressure sensing probe. The pressure sensing probe is pressure sensing's a key component, the cardinal principle is the change that turns into outside pressure variation physical characteristic such as fiber length, and then arouse in the whole michelson interferometer structure phase signal's of light among change and the sensing fiber of length between reference arm and the signal arm change, through interfering, phase signal's change turns into light -intensity signal's change, the light -intensity signal who detects through demodulation photoelectric detector, can realize the measurement of phase signal change, and then the change that can the inverting goes out pressure signal. The utility model discloses can realize pressure signal's measurement.
Description
Technical field
This utility model relates to technical field of optical fiber sensing, is specifically related to a kind of mikey based on 3*3 bonder
The inferior interference-type pressure transducer of that..
Background technology
Pressure transducer, as the typical sensor of one, relates to concern the every field of national economy.Pressure
Force transducer generally utilizes sensing unit to environmental variable such as physical effect, and chemical effect etc. is made various
Pressure transducer, tonometric scope gradually steps up, along with sensor is to integrated, intelligent, little
Development in terms of type, seriation and standardization, and along with Modern Tracking Technology's, computer technology, number
According to the raising of signal processing technology, in high precision, the demand of highly sensitive pressure transducer is the most increasing,
Fibre optic compression sensor develops into a kind of new research tendency along with new technique.
Fibre optic compression sensor starts input research, according to optical fiber in a test system from 19th-century the seventies
Application, current fibre optic compression sensor can be largely classified into functional fiber pressure transducer and non-functional type
Fibre optic compression sensor.Functional fiber pressure transducer is to certain of optical fiber self under ambient pressure effect
A little optical characteristics are modulated, rather than functional fiber pressure transducer is made by other optical sensing elements
Complete sensing function.In the Chinese patent that publication number is CN102297743A, it is proposed that a kind of optical fiber
Pressure transducer, its critical piece is elastic film, optical resonator and optical fiber collimator, elastic film with
The one side that optical fiber collimator is relative is coated with highly reflecting films, when ambient pressure changes when, can cause elastica
Sheet deforms upon, and then reflected light back can be along with the change of pressure to the energy on optical fiber collimator end face
Change, the continuous monitoring of pressure can be realized by measuring the pressure of emergent light, for this intensity modulation type
Fibre Optical Sensor sensitivity and precision the most relatively low, it is impossible to realize high-acruracy survey.In publication number
For proposing a kind of high-performance optical fiber pressure sensor in the Chinese patent of CN1743821A, it is specifically related to one
Planting the high-performance optical fiber pressure sensor of Oil Well State Monitor, its cardinal principle is by spectroanalysis instrument handle
The measure of the change of enamel-amber cavity length out, and then realizes the measurement of pressure.But the fabrication and processing due to enamel-amber chamber
Difficulty is relatively big, and range ability is little has certain limitation, and needs to coordinate spectroanalysis instrument to grasp
Make, which greatly enhances cost, reduce practicality in engineer applied.
It is little that optical fiber interference type pressure transducer has volume, lightweight, electromagnetism interference, radioprotective, resistance to height
Temperature, corrosion-resistant, high sensitivity, high-precision feature, optical fiber interference type pressure transducer is led at measuring science
Territory has great application prospect.
Summary of the invention
This utility model is for the deficiency of existing pressure transducer, and he proposes a kind of simple in construction, sensitivity
Height, highly reliable, the optical fiber interference type pressure transducer based on 3*3 bonder of advantage of lower cost.
This utility model includes following technical scheme:
A kind of optical fiber interference type pressure transducer based on 3*3 bonder, specifically includes semiconductor laser (1),
Isolator (2), 3*3 bonder (3) arranged in parallel, the first light-conductive optic fibre (4), the second light-conductive optic fibre (5),
Presser sensor probe (6), reference optical fiber is around ring (7), first faraday's rotating mirror (8), second faraday's rotation
Mirror (9), the first photodetector (10), the second photodetector (11), host computer demodulating system (12).
Semiconductor laser (1) is connected with the input of isolator (2) by single-mode fiber, isolator (2)
Outfan is connected with the input of 3*3 bonder (3) arranged in parallel, 3*3 bonder (3) arranged in parallel
Two outfans one of them be connected with the first light-conductive optic fibre (4), another outfan and the second guide-lighting light
Fine (5) are connected, and the first light-conductive optic fibre (4) is connected with pressure sensing probe (6), the second light-conductive optic fibre (5)
Being connected around ring (7) with reference optical fiber, pressure sensing probe (6) is connected with first faraday's rotating mirror (8),
Reference optical fiber is connected with second faraday's rotating mirror (9) around ring (7), and reference optical fiber passes with pressure around ring (7)
Sense probe constitutes the interference arm of Michelson interference, with the input homonymy of 3*3 bonder (3) arranged in parallel
Two ports as interfere outfan respectively with the first photodetector (10) and the second photodetection (11)
It is connected, the first photodetector (10) and the second photodetector (11) and host computer demodulating system (12)
It is connected.Pressure sensing probe in system realizes pressure sensing, whole pressure by the physical characteristic changing optical fiber
Power sensor-based system is built upon on Michelson's principle of interference.
Principle of the present utility model: fibre optic compression sensor based on 3*3 bonder has been based primarily upon Michael
The principle of inferior interference, it is achieved the judgement of phase contrast, and utilize the character of 3*3 bonder arranged in parallel to realize phase
Position changes nyctitropic judgement, thus realizes the measurement of pressure change.The phase place transmitting light in optical fiber can be due to light
Fine Stress-strain Effect, poisson effect and photoelastic effect and change.Pressure signal acts on pressure sensing and visits
Conduction optical fiber in Tou, makes the phase signal of light in conduction optical fiber change, in Michelson interference structure
In, the signal arm constituted due to pressure transducer and the reference phase place letter between the reference arm that ring is constituted
Number changing, the output after interference can change, and interference signal is converted into light intensity letter by photodetector
Number, and due to the weak coupling characteristic between 3*3 bonder arranged in parallel, by 3*3 arranged in parallel after interference
The two paths of signals of bonder output has fixing phase contrast 2 π/3, can realize signal according to Fringe-counting method
Demodulation, demodulate out from light intensity signal by phase signal, by phase signal and the linear relationship of pressure signal,
And then the measurement of pressure can be realized.Specifically can use following method: from data, owing to interfering
The output of rear 3*3 coupling device has a following approximation relation:
Wherein φ (t) is the drift of light source random phase, and δ is the fixed skew of two-way light, solid in this cover system
Phase bit difference is approximately 2 π/3.When acting on pressure sensing probe due to pressure, light in pressure sensing probe
Phase signal changes, and after interference, the value of output intensity changes, for cosine and sine signal, along with phase
Position being continuously increased or reduce of signal, its amplitude periodically changes, therefore as a example by the first photodetector,
The knots modification of phase signal can be tried to achieve by the number calculating its mechanical periodicity of light intensity signal, but the most whereby
The change direction of phase signal cannot be judged, therefore by contrasting the first photodetector and the second photodetection
Light intensity signal measured by device, use in fringe count sentence to method can demodulate phase place change size and
Direction.Owing to phase signal and pressure signal have linear relationship, the change of pressure signal therefore can be finally inversed by
Change, it is achieved the measurement of pressure.
Beneficial effect:
Compared with prior art, this utility model has the following advantages, and should do by optical fiber based on 3*3 bonder
Relate to type pressure transducer, make use of Michelson interference structure and the character of 3*3 bonder arranged in parallel, 1)
Flexible structure, highly sensitive, range easily adjusts, and 2) to sentence to easily, demodulation is convenient, and precision is higher, and 3)
It is easy to produce and application, and essential safety, 4) electromagnetism interference, corrosion-resistant, it is possible to achieve the height to pressure
Measure of precision.
Accompanying drawing explanation
Fig. 1 is based on the 3 optical fiber interference type pressure sensor systems block diagrams taking advantage of 3 bonders；
Fig. 2 is based on the 3 optical fiber interference type pressure sensor structure figures taking advantage of 3 bonders；
Fig. 3 presser sensor sonde configuration figure；
Fig. 4 presser sensor probe profile.
Labelling in figure:
1. quasiconductor width laser instrument, 2. isolator, 3*3 bonder the most arranged in parallel, 4. the first light-conductive optic fibre,
5. the second light-conductive optic fibre, 6. presser sensor probe, 7. reference optical fiber is around ring, 8. first faraday's rotating mirror, and 9. the
Two faraday's rotating mirror, 10. the first photodetectors, 11. second photodetectors, 12. host computer demodulating systems,
13. sensing probe housings, 14. sensing probe weight body, 15. first coaxial cylinders, 16. sensor fibres, 17. silica gel
Layer, 18. second coaxial cylinders.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but is not limited to this.
Embodiment 1
As it is shown in figure 1, system block diagrams based on the 3 optical fiber interference type pressure transducers taking advantage of 3 bonders.Should
Utility model includes semiconductor laser, isolator, 3*3 bonder arranged in parallel, pressure sensing arm, ginseng
Examine fiber arm, photodetector, host computer demodulating system totally seven major part.The light that semiconductor laser sends
After isolator, after incoming 3*3 bonder arranged in parallel, be divided into two-beam, a branch of by pressure sensing arm after
Returning, another light beam is by returning after reference optical fiber arm, and the light of backspace is sent out in 3*3 bonder arranged in parallel
Raw interference, is divided into three-beam wherein two bundles and is carried out signal by host computer demodulating system after entering photodetectors
Demodulation, it is achieved the measurement to pressure signal.
Embodiment 2
As in figure 2 it is shown, based on the 3 optical fiber interference type pressure sensor structure figures taking advantage of 3 bonders.This sensing
Device structure includes semiconductor laser 1, isolator 2,3*3 bonder 3 arranged in parallel, light-conductive optic fibre 4,5,
Presser sensor probe 6, reference optical fiber around ring 7, faraday's rotating mirror 8,9, photodetector 10,11, on
Position machine demodulating system 12.Semiconductor narrow bandwidth laser device 1 is connected with isolator 2, the outfan of isolator 2
Being connected with 3*3 bonder 3 arranged in parallel, two outfans of 3*3 bonder 3 arranged in parallel are divided into A, B
Two-way, A road is connected with presser sensor probe 6 by the first light-conductive optic fibre 4, and the second light-conductive optic fibre is passed through on B road
5 are connected around ring 7 with reference optical fiber, and presser sensor probe 6 and reference optical fiber are around the outfan of ring 7 and the first method
Rotating mirror 8 is drawn to be connected with second faraday's rotating mirror 9.The light returned interferes, with parallel after bonder
Property arrangement 3*3 bonder input homonymy two ports as system outfan respectively with the first photoelectricity
Detector 10 is connected with the second photodetector 11, the first photodetector 10 and the second photodetector 11
Output signal adopted into host computer demodulating system 12 by data collecting card.
The optical fiber interference type pressure transducer of 3 bonders should be taken advantage of to be based on Michelson interference with parallel based on 3
Arrangement 3 takes advantage of the coupled characteristic of 3 bonders to make.Its operation principle is: for preventing from returning light to light source product
Raw impact, the light that semiconductor narrow bandwidth laser device sends is incoming 3*3 bonder arranged in parallel after isolator,
Light beam is divided into three-beam after bonder, takes two-way therein, and a road light enters pressure by light-conductive optic fibre
After power sensing probe, returning after faraday's rotating mirror, another road light is by entering reference light after light-conductive optic fibre
Fine after ring, return after faraday's rotating mirror, sensor fibre in presser sensor probe and around examine optical fiber around
Sensor fibre in ring constitutes signal arm and the reference arm of Michelson interference structure.Light after return passes through
Interfere after 3*3 bonder arranged in parallel, due to the effect of pressure so that between reference arm and signal arm
Phase contrast change, after interference, phase place change is converted into light intensity change, enters the light after photodetector
Strong signal is demodulated demodulating the change of phase place, according to phase signal and pressure by host computer demodulating system
Linear relationship between force signal, it is possible to achieve the measurement of pressure signal.
Embodiment 3
As shown in Figure 3, Figure 4, for these pressure based on the 3 optical fiber interference type pressure transducers taking advantage of 3 bonders
The structure chart of sensing probe and profile.From Fig. 3 and Fig. 4, when sensing probe weight body 14 is by outward
The when of boundary's pressure, the second coaxial cylinder 18 can be driven to move up and down, due to the first coaxial cylinder 15 and pressure
Power sensing probe housing 13 is connected, and therefore can cause sensing when the second coaxial cylinder 18 moves up and down when
The length of optical fiber flexible is so that reference arm in Michelson interference system and relatively long between signal arm
Degree changes, and then causes the phase place transmitting light in optical fiber to change, finally by light intensity signal
Demodulation can realize the measurement of pressure.In sensing probe, sensor fibre 16 scribbles layer of silica gel, prevents
There is no the sensor fibre dislocation being wound around during pressure.It is wrapped on coaxial cylinder 15 and coaxial cylinder 18
The number of turn of sensor fibre can be modified according to the demand of different ranges.
Embodiment 4
In above-described embodiment 1-3, the light-conductive optic fibre being previously mentioned and sensor fibre are core diameter and are
9 μm, cladding diameter is the single mode ordinary optic fibre of 125 μm, and the centre wavelength of semiconductor narrow laser instrument is 1550nm,
Layer of silica gel used silica gel elastic modelling quantity between 0-100 degree Celsius in sensing probe is basicly stable, and first is coaxial
The maximum radius of cylinder and the second coaxial cylinder is more than 2cm, or the bending radius more than optical fiber.
Above content is to combine concrete preferred implementation further detailed description of the utility model,
It cannot be assumed that of the present utility model being embodied as is confined to these explanations.Ordinary skill people for this area
For Yuan, corresponding change and replacement can be made according to the technical solution of the utility model and inventive concept,
And performance or purposes are identical, protection domain of the present utility model all should be considered as.
Claims (3)
1. an optical fiber interference type pressure transducer based on 3*3 bonder, specifically includes semiconductor laser
Device (1), isolator (2), 3*3 bonder (3) arranged in parallel, the first light-conductive optic fibre (4), second leads
Light optical fiber (5), presser sensor probe (6), reference optical fiber around ring (7), first faraday's rotating mirror (8),
Second faraday's rotating mirror (9), the first photodetector (10), the second photodetector (11), host computer
Demodulating system (12)；It is characterized in that: the outfan of semiconductor laser is connected with the input of isolator,
The outfan of isolator is connected with an input of 3*3 bonder arranged in parallel, and bonder has three outputs
End, takes after two outfans wherein road therein is connected with the first light-conductive optic fibre and presser sensor is popped one's head in and method
Rotating mirror is drawn to be sequentially connected；Revolve around ring and faraday with reference optical fiber after another road is connected with the second light-conductive optic fibre
Mirror is sequentially connected with；Pressure probe and reference optical fiber have respectively constituted signal arm and the ginseng of Michelson interference around ring
Examine arm；It is connected with photodetector respectively as outfan with two ports of coupler input homonymy and is followed by
Enter host computer demodulating system.
A kind of optical fiber interference type pressure transducer based on 3*3 bonder the most according to claim 1,
It is characterized in that: the presser sensor probe in fiber interference structure includes sensing probe housing (13), sensitive spy
Head weight body (14), the first coaxial cylinder (15), sensor fibre (16), layer of silica gel (17), second is same
Jack-post body (18) forms；Sensing probe weight body (14) is connected with the second coaxial cylinder (18), and first
Coaxial cylinder (15) is connected with sensing probe housing (13), and it is coaxial that sensor fibre (16) is wrapped in first
On cylinder (15) and the second coaxial cylinder (18), layer of silica gel (17) is coated in sensor fibre (16) outward
Layer；It is characterized in that, when ambient pressure changes when, sensing probe weight body can move up and down, due to
Together jack-post body is fixed with housing, and weight body moves up and down and sensor fibre stretching can be made to compress, layer of silica gel
Ensure that winding sensor fibre will not because external force change and entanglement, the stretching of sensor fibre can make whole
In system, the phase place of optical signal between reference arm and signal arm changes, can be anti-by demodulation phase change
Performance pressure change.
A kind of optical fiber interference type pressure transducer based on 3*3 bonder the most according to claim 1,
It is characterized in that: described presser sensor probe (6), its first coaxial cylinder and the second coaxial cylinder are
Large radius is more than 2cm, i.e. more than the bending radius of sensor fibre；The silica gel that layer of silica gel is used is zero to one hundred
In degree Celsius range, elastic modulus change is the least, does not affect normal use.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620340504.2U CN205538043U (en) | 2016-04-21 | 2016-04-21 | Optic fibre interference type pressure sensor based on 3 take advantage of 3 couplers |
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758567A (en) * | 2016-04-21 | 2016-07-13 | 吉林大学 | Fiber interference type pressure sensor based on 3*3 coupler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758567A (en) * | 2016-04-21 | 2016-07-13 | 吉林大学 | Fiber interference type pressure sensor based on 3*3 coupler |
| CN105758567B (en) * | 2016-04-21 | 2019-05-24 | 吉林大学 | The optical fiber interference type pressure sensor for multiplying 3 couplers based on 3 |
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