CN106840366A - A kind of homodyne orthogonal fibre interferes vibration detecting device - Google Patents
A kind of homodyne orthogonal fibre interferes vibration detecting device Download PDFInfo
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- CN106840366A CN106840366A CN201710264643.0A CN201710264643A CN106840366A CN 106840366 A CN106840366 A CN 106840366A CN 201710264643 A CN201710264643 A CN 201710264643A CN 106840366 A CN106840366 A CN 106840366A
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- 239000000835 fiber Substances 0.000 title claims abstract description 18
- 230000010287 polarization Effects 0.000 claims abstract description 30
- 239000000919 ceramic Substances 0.000 claims abstract description 10
- 239000013307 optical fiber Substances 0.000 claims description 17
- 239000000523 sample Substances 0.000 claims description 11
- 230000005622 photoelectricity Effects 0.000 claims description 2
- 238000012546 transfer Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
Abstract
A kind of homodyne orthogonal fibre interferes vibration detecting device, and described device includes：LASER Light Source (1), first Polarization Controller (2), the coupler of polarization-maintaining 2 × 2 (3), the second Polarization Controller (4), piezoelectric ceramics (5), vibrating sensing is popped one's head in (8), the first speculum (6), the second speculum (7), polarization beam apparatus (9), photodetector 1 (11), photodetector 2 (10), vibration demodulation module (12).Linearly polarized light is sent by LASER Light Source, circularly polarized light is become by the first Polarization Controller, two beams are divided into by the coupler of polarization-maintaining 2 × 2, the first beam is via the second Polarization Controller, piezoelectric ceramics, the reflection of the first speculum；Second beam is popped one's head in by vibrating sensing, second speculum reflects, two beam reflected lights are divided into the orthogonal interference signal of two beams and are received by photodetector 1 and photodetector 2 respectively by the coupler transfer of polarization-maintaining 2 × 2 to polarization beam apparatus, and the orthogonal interference signal of two-way is vibrated demodulation module demodulation and obtains the tested vibration information of high accuracy.
Description
Technical field
The invention belongs to detecting instrument field, a kind of homodyne orthogonal fibre interference vibration detecting device is mainly introduced.
Background technology
In recent years, with the fast development of modern industry and new technology, to the required precision of vibration measurement device increasingly
Height, the technology of optical means high-acruracy survey vibration signal is widely paid attention to, especially in some specific research fields,
Micro-nano measurement, demarcation of high precision and high sensitivity wave detector in such as Precision Machining etc., its application demand is increasingly urgent, because
This, high-precision vibration measurement has important realistic meaning.Therefore, how to find it is more accurate measurement micro-vibration method with
And device is a critically important job.
Based on existing technology, pertinent instruments and measuring method occur in succession, for example：Double-frequency laser interference vialog (journey
Million paddy；Naval high, two-frequency laser interferometer, CN200410052915.3), homodyne laser interference vialog (Wang Ming etc., orthogonal type
Homodyne interferometer and its measuring method, CN201510287943.1), but there is bulky, optical element in these instruments
It is discrete, light path adjustment it is complicated because the shortcomings of, therefore while how improving precision and simplify device, realize automation adjustment survey
Amount, and it is current problem demanding prompt solution to obtain the measured value of higher precision.
The content of the invention
Present invention aim at a kind of homodyne orthogonal fibre interference vibration detecting device is provided, the present invention be directed to vibrate in high precision
Measurement application, there is provided a kind of high accuracy, the optical fiber type vibration detecting device based on homodyne quadrature interference technology of high stability.
A kind of homodyne orthogonal fibre interference vibration detecting device of the present invention, described device includes：LASER Light Source (1), first is inclined
Shake controller (2), the coupler of polarization-maintaining 2 × 2 (3), the second Polarization Controller (4), piezoelectric ceramics (5), vibrating sensing probe (8),
First speculum (6), the second speculum (7), polarization beam apparatus (9), photodetector 1 (11), photodetector 2 (10) shakes
Dynamic demodulation module (12).Linearly polarized light is sent by LASER Light Source, becomes circularly polarized light by the first Polarization Controller, by polarization-maintaining
2 × 2 couplers are divided into two beams, and the first beam is via the second Polarization Controller, piezoelectric ceramics, the reflection of the first speculum；Second beam is passed through
Vibration sensing probe is crossed, the second speculum reflection, two beam reflected lights are divided by the coupler transfer of polarization-maintaining 2 × 2 to polarization beam apparatus
Received by photodetector 1 and photodetector 2 respectively into the orthogonal interference signal of two beams, the orthogonal interference signal of two-way is shaken
Dynamic demodulation module demodulation obtains the tested vibration information of high accuracy.
As shown in figure 3, photodetector 1 and the orthogonal signalling I received by photodetector 21(t)、I2T () is respectively：
Here, I0The light intensity of light, k are sent for LASER Light SourcevIt is visibility of interference fringes,To be tested interferometer phase
Relation between variable signal, with the tested vibrating sensing probe elongate optical fiber amount Δ L for vibrating and causing is as follows：
Here n is fiber core refractive index, λ0It is very airborne wavelength.
Demodulation module is combined by analyzing the signal that photodetector 1 and photodetector 2 are received, and with photodetection
The change that the electric signal of device 1 carries out interference signal records the elongate optical fiber amount that corresponding vibrating sensing is popped one's head in, and elongate optical fiber amount is every
Increase half wavelength length lambda0/ 2 (A points change from down to up in Fig. 3), the signal intensity π of photodetector 1, and photodetector 2
Electric signal change from small to big through direct current biasing amount I0, and elongate optical fiber amount shortens half wavelength length lambda0/ 2 (A points in Fig. 3, by
Top to bottm changes), the signal intensity π of photodetector 1, and the electric signal of photodetector 2 passes through direct current biasing amount from large to small
I0, therefore photodetector 2 judges signal for direction of vibration, and photodetector 1 is interference signal accumulated signal, the two cooperation
Use, so as to obtain high accuracy vibration change information.
Advantages of the present invention：
(1) light path directly obtains the orthogonal optical signal of two-way, reduces demodulation module design difficulty；
(2) adjustment of all -fiber light path is easy, and simple structure, real-time is good, is easy to measurement measuring speed fast, improves measurement effect
Rate；
(3) probe makes simple, and sensitivity is high；
(4) piezoelectric ceramics in light path is high-precision control device, for compensating initial phase difference, and then improves whole dress
The precision put.
Brief description of the drawings
Fig. 1 is a kind of homodyne orthogonal fibre interference vibration detecting device structural representation of the invention.
Fig. 2 is vibrating sensing probe of the invention.Vibrating sensing probe includes three parts：Elastic Cylindrical element (81),
Input polarization maintaining optical fibre (82), output polarization maintaining optical fibre (83).
Fig. 3 is the detectable signal of photodetector 1 and photodetector 2.
Specific embodiment
Specific embodiment of the invention is illustrated below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of homodyne orthogonal fibre interference vibration detecting device of the present invention includes LASER Light Source (1), first is inclined
Shake controller (2), the coupler of polarization-maintaining 2 × 2 (3), the second Polarization Controller (4), piezoelectric ceramics (5), vibrating sensing probe (8),
First speculum (6), the second speculum (7), polarization beam apparatus (9), photodetector 1 (11), photodetector 2 (10) shakes
Dynamic demodulation module (12).Linearly polarized light is sent by LASER Light Source, becomes circularly polarized light by the first Polarization Controller, by polarization-maintaining
2 × 2 couplers are divided into two beams, and the first beam is via the second Polarization Controller, piezoelectric ceramics, the reflection of the first speculum；Second beam is passed through
Vibration sensing probe is crossed, the second speculum reflection, two beam reflected lights are divided by the coupler transfer of polarization-maintaining 2 × 2 to polarization beam apparatus
Received by photodetector 1 and photodetector 2 respectively into the orthogonal interference signal of two beams, the orthogonal interference signal of two-way is shaken
Dynamic demodulation module demodulation obtains the tested vibration information of high accuracy.
As shown in Fig. 2 during measurement vibration, vibrating sensing probe placement is direct in the underface that tested vibration applies direction
The tested vibration of impression, the invention provides a kind of sonde configuration for quadrature interference vibration detecting device, the sonde configuration is as follows：
Elastic Cylindrical element (81) will be processed into elasticity material higher, specific diameter dimension will by surveyed environment
Summation optical fiber minimum profile curvature radius and determine.When applying to vibrate to optical fiber, vibration causes fiber lengths to change, and light is from input
Polarization maintaining optical fibre (82) input is waited by periphery uniform winding polarization maintaining optical fibre and carries vibration information by output polarization maintaining optical fibre (83)
Output.
Fig. 3 show photodetector 1 and signal intensity measured by photodetector 2, and demodulation module is by analyzing photoelectricity
The signal that detector 1 and photodetector 2 are received is combined, and the change of interference signal is carried out with the electric signal of photodetector 1
Change records the elongate optical fiber amount of corresponding vibrating sensing probe, and elongate optical fiber amount often increases half wavelength length lambda0/ 2 ((A in Fig. 3
Point, changes from down to up)), the signal intensity π of photodetector 1, and the electric signal of photodetector 2 changes from small to big through direct current
Amount of bias I0, and elongate optical fiber amount shortens half wavelength length lambda0/ 2 (A points, change from top to bottom in Fig. 3)), photodetector 1
Signal intensity π, and the electric signal of photodetector 2 passes through direct current biasing amount I from large to small0, therefore photodetector 2 is vibration
Walking direction signal, and photodetector 1 is interference signal accumulated signal, the two is used cooperatively, and is vibrated so as to obtain high accuracy
Change information.
Claims (7)
1. a kind of homodyne orthogonal fibre interference vibration detecting device includes：LASER Light Source, the first Polarization Controller, polarization-maintaining 2 × 2 is coupled
Device, the second Polarization Controller, piezoelectric ceramics, vibrating sensing probe, the first speculum, the second speculum, polarization beam apparatus, photoelectricity
Detector 1, photodetector 2 vibrates demodulation module.Linearly polarized light is sent by LASER Light Source, is become by the first Polarization Controller
Into circularly polarized light, two beams are divided into by the coupler of polarization-maintaining 2 × 2, the first beam is via the second Polarization Controller, piezoelectric ceramics, first
Speculum reflects；Second beam is popped one's head in by vibrating sensing, the reflection of the second speculum, and two beam reflected lights are by the coupler of polarization-maintaining 2 × 2
It is transferred to polarization beam apparatus and is divided into the orthogonal interference signal of two beams and is received by photodetector 1 and photodetector 2 respectively, two-way
Orthogonal interference signal is vibrated demodulation module demodulation and obtains the tested vibration information of high accuracy.
2. a kind of homodyne orthogonal fibre interferes vibration detecting device according to claim 1, it is characterised in that：LASER Light Source is output
The LASER Light Source of polarization-maintaining laser.
3. a kind of homodyne orthogonal fibre according to claim 2 interferes vibration detecting device, and its spy is：First Polarization Controller
The polarization state of light is changed into circularly polarized light.
4. a kind of homodyne orthogonal fibre according to claim 2 interferes vibration detecting device, and its spy is：The coupler of polarization-maintaining 2 × 2
Splitting ratio be 50:50.
5. a kind of homodyne orthogonal fibre according to claim 2 interferes vibration detecting device, and its spy is：Piezoelectric ceramics is high-precision
Degree control device, for compensating initial phase difference, and then improves the precision of whole device.
6. a kind of homodyne orthogonal fibre according to claim 2 interferes vibration detecting device, and its spy is：Polarization beam apparatus will be dry
Relate to signal and be divided into the orthogonal interference signal of two beams.
7. a kind of homodyne orthogonal fibre according to claim 2 interferes vibration detecting device, and its spy is being：Vibration demodulation module
The change that electric signal according to photodetector 1 carries out interference signal records the elongate optical fiber amount that corresponding vibrating sensing is popped one's head in,
Elongate optical fiber amount often changes half wavelength length (micron dimension), the signal intensity π of photodetector 1, and combines photodetector 2
Electric signal carry out the judgement of direction of vibration, so as to obtain high accuracy vibration change information.
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| CN201710264643.0A CN106840366A (en) | 2017-04-21 | 2017-04-21 | A kind of homodyne orthogonal fibre interferes vibration detecting device |
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| CN201710264643.0A CN106840366A (en) | 2017-04-21 | 2017-04-21 | A kind of homodyne orthogonal fibre interferes vibration detecting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632028A (en) * | 2019-09-29 | 2019-12-31 | 安徽大学 | Zero background laser absorption spectrum detection system based on interference between optical fiber polarization modes |
| CN110895165A (en) * | 2019-12-27 | 2020-03-20 | 华中科技大学 | Optical fiber vibration sensing system based on polarization maintaining optical fiber |
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|---|---|---|---|---|
| US5894531A (en) * | 1997-03-11 | 1999-04-13 | Karta Technology, Inc. | Method and apparatus for detection of ultrasound using a fiber-optic interferometer |
| EP0924507A1 (en) * | 1997-12-22 | 1999-06-23 | PIRELLI CAVI E SISTEMI S.p.A. | Interferometer for measurements of optical properties in bulk samples |
| CN102289152A (en) * | 2011-05-18 | 2011-12-21 | 中国科学院长春光学精密机械与物理研究所 | optical system wave aberration detection device |
| CN203443662U (en) * | 2013-09-23 | 2014-02-19 | 安徽大学 | Apparatus capable of improving signal to noise ratio of laser micro-vibration sensing system |
| CN104061998A (en) * | 2014-07-02 | 2014-09-24 | 中国计量科学研究院 | Diffuse reflection type homodyne orthogonal laser vibration measurer |
| CN105606194A (en) * | 2015-12-29 | 2016-05-25 | 哈尔滨工业大学 | Underwater acoustic signal real-time extraction method based on laser orthogonal polarization interference technology |
| KR20170028482A (en) * | 2015-09-03 | 2017-03-14 | 서강대학교산학협력단 | Quadrature homodyne detecter by using 2 photo detecters |
-
2017
- 2017-04-21 CN CN201710264643.0A patent/CN106840366A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5894531A (en) * | 1997-03-11 | 1999-04-13 | Karta Technology, Inc. | Method and apparatus for detection of ultrasound using a fiber-optic interferometer |
| EP0924507A1 (en) * | 1997-12-22 | 1999-06-23 | PIRELLI CAVI E SISTEMI S.p.A. | Interferometer for measurements of optical properties in bulk samples |
| CN102289152A (en) * | 2011-05-18 | 2011-12-21 | 中国科学院长春光学精密机械与物理研究所 | optical system wave aberration detection device |
| CN203443662U (en) * | 2013-09-23 | 2014-02-19 | 安徽大学 | Apparatus capable of improving signal to noise ratio of laser micro-vibration sensing system |
| CN104061998A (en) * | 2014-07-02 | 2014-09-24 | 中国计量科学研究院 | Diffuse reflection type homodyne orthogonal laser vibration measurer |
| KR20170028482A (en) * | 2015-09-03 | 2017-03-14 | 서강대학교산학협력단 | Quadrature homodyne detecter by using 2 photo detecters |
| CN105606194A (en) * | 2015-12-29 | 2016-05-25 | 哈尔滨工业大学 | Underwater acoustic signal real-time extraction method based on laser orthogonal polarization interference technology |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632028A (en) * | 2019-09-29 | 2019-12-31 | 安徽大学 | Zero background laser absorption spectrum detection system based on interference between optical fiber polarization modes |
| CN110632028B (en) * | 2019-09-29 | 2022-09-27 | 安徽大学 | Zero background laser absorption spectrum detection system based on interference between optical fiber polarization modes |
| CN110895165A (en) * | 2019-12-27 | 2020-03-20 | 华中科技大学 | Optical fiber vibration sensing system based on polarization maintaining optical fiber |
| CN110895165B (en) * | 2019-12-27 | 2021-09-24 | 华中科技大学 | Optical fiber vibration sensing system based on polarization maintaining optical fiber |
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Application publication date: 20170613 |