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 PDF

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Publication number
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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China
Prior art keywords
light
optical fiber
change
pressure
signal
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Expired - Fee Related
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CN201620340504.2U
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Chinese (zh)
Inventor
郎金鹏
王旭
陈建冬
常天英
崔洪亮
于淼
高文智
刘野
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Jilin Special Medical Food Biotechnology Co ltd
Jilin University
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Jilin Special Medical Food Biotechnology Co ltd
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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

Based on the 3 optical fiber interference type pressure transducers taking advantage of 3 bonders
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:
P 1 ∝ s i n ( ω t + φ ( t ) ) P 2 ∝ s i n ( ω t + φ ( t ) + δ )
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.
CN201620340504.2U 2016-04-21 2016-04-21 Optic fibre interference type pressure sensor based on 3 take advantage of 3 couplers Expired - Fee Related CN205538043U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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Granted publication date: 20160831

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