CN106197289A - Optical fiber length measuring system - Google Patents
Optical fiber length measuring system Download PDFInfo
- Publication number
- CN106197289A CN106197289A CN201610671296.9A CN201610671296A CN106197289A CN 106197289 A CN106197289 A CN 106197289A CN 201610671296 A CN201610671296 A CN 201610671296A CN 106197289 A CN106197289 A CN 106197289A
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- CN
- China
- Prior art keywords
- module
- optical fiber
- measuring system
- length measuring
- fiber length
- 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.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
Abstract
The present invention provides optical fiber length measuring system, the phase contrast of two bundle coherent light signals is modulated, and detect the delustring frequency of testing fiber at signal processing end thus calculate testing fiber length, will not be because of the luminous power considerable influence linear measure longimetry of Fresnel reflection, there is not measurement blind area, it is adaptable to the measurement of various length of fibre.
Description
Technical field
The present invention relates to linear measure longimetry field, particularly relate to optical fiber length measuring system.
Background technology
In prior art, time domain reflectometry is generally used to carry out optical fiber length measuring, by emitting light in optical fiber, simultaneously
Receive Fresnel reflection light therein and Rayleigh scattering light at receiving terminal, through opto-electronic conversion processing and amplifying, finally draw optical fiber
Length value, the shortcoming of the method is: due to near-end pinch Fei Er reflection luminous power bigger so that it is exist measurement blind area, it is impossible to
Measure the optical fiber that length is shorter.
Summary of the invention
The present invention provides optical fiber length measuring system, solves existing fiber length measuring system and there is asking of measurement blind area
Topic.
The present invention solves the problems referred to above by below scheme:
Optical fiber length measuring system, including fiber optic interferometric module, controller module and DDS module；Described fiber optic interferometric
One road input of module is connected with testing fiber, and the outfan of described fiber optic interferometric module is connected with controller module；Described
Controller module is connected with the input of DDS module；The outfan of described DDS module inputs with another road of fiber optic interferometric module
End is connected.
Further, also include that display module, described display module are connected with controller module.
Further, also include that memory module, described memory module are connected with controller module.
Further, described fiber optic interferometric module includes laser instrument, photonic module, detector, piezoelectric ceramics and transmitting mirror；
Described transmitting mirror is connected with testing fiber；Described piezoelectric ceramics is connected with light to be measured, and described piezoelectric ceramics is defeated with DDS module
Going out end to be connected, described piezoelectric ceramics is connected with optical module；Described optical module is connected with the outfan of laser instrument, described optical module
Outfan is connected with the input of detector.
Further, described photonic module is 3*3 bonder.
Compared with prior art, have a characteristic that
The phase contrast of two bundle coherent light signals is modulated by the present invention, and detects testing fiber at signal processing end
Delustring frequency thus calculate testing fiber length, will not be because of the luminous power considerable influence linear measure longimetry of Fresnel reflection, no
Exist and measure blind area, be applicable to the measurement of various length of fibre.
Accompanying drawing explanation
Fig. 1 is present configuration theory diagram.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, but the invention is not limited in these embodiments.
Optical fiber length measuring system, including fiber optic interferometric module, controller module and DDS module；Fiber optic interferometric module
A road input be connected with testing fiber, the outfan of fiber optic interferometric module is connected with controller module；Controller module with
The input of DDS module is connected；The outfan of DDS module is connected with another road input of fiber optic interferometric module.
Fiber optic interferometric module includes reflecting mirror, piezoelectric ceramics, laser instrument, photonic module and detector；Transmitting mirror is with to be measured
Optical fiber is connected；Piezoelectric ceramics is connected with light to be measured, and piezoelectric ceramics is connected with the outfan of DDS module, piezoelectric ceramics and optical mode
Block is connected；Optical module is connected with the outfan of laser instrument, and the outfan of optical module is connected with the input of detector.Modulated signal
Being applied on piezoelectric ceramics, piezoelectric ceramics is stretching that radially generation is directly proportional to modulated signal, it is achieved the phase place to optical signal
Modulation.
Reflecting mirror is installed on the side of testing fiber so that light backtracking, forms two-way coherent light.Piezoelectric ceramics has
Piezoelectric effect, exchanges mechanical energy and electric energy.Laser instrument is used for launching laser.Laser instrument contains driving source, has metastable state energy
The working media of level and resonator cavity.Driving source promotes working media absorption extraneous energy to reach excited state, maintains population to turn over
Turn；Working media has metastable state level, stimulated radiation can be made to occupy an leading position, it is achieved light amplification；Resonator cavity makes intracavity light
Son has consistent frequency, phase place and traffic direction.Modulated signal input in piezoelectric ceramics, piezoelectric ceramics radially produce with
It is flexible that modulated signal is directly proportional, and realizes the phase-modulation to optical signal.Photonic module is 3*3 bonder, receives piezoelectric ceramics
Signal, carry out the interference of light, in interference signal input to detector, luminous power be converted to corresponding electric current, input is to controlling
In device module.
DDS module is Direct Digital Synthesizer, 1 CPLD, 1 store 1 complete
The ROM of cycle sinusoidal signal and 18 high-speed d/a conversion chip are constituted, the highest by decision systems of its minimum frequency resolution
Certainty of measurement.DDS module receives the instruction of controller module, and the signal producing corresponding frequencies by instruction inputs to piezoelectric ceramics
In.The DDS module of the present invention has the advantages such as low cost, low-power consumption, high-resolution and fast conversion times,
Controller module gathers the signal of fiber optic interferometric module, uses WELCH algorithm, obtain the signal power of this frequency with
The power ratio of modulated signal, completes the sampling of a Frequency point, in completing the scope of application after the detection of all Frequency points, finds out
Signal power is than minimum Frequency point, and this dot frequency is delustring frequency, substitutes into formula and calculates fiber lengths.
The present invention further comprises display module, and display module is connected with controller module；Display module is used for showing
The length of measured optical fiber.The present invention further comprises memory module, and memory module is connected with controller module, deposits
Storage module is used for storing each Frequency point and corresponding power ratio.
The work process of the present invention is: controller module sends instruction to DDS module so that it is produce assigned frequency by instruction
Modulated signal, modulated signal input is in fiber optic interferometric module, and meanwhile, the signal of testing fiber also inputs to fiber optic interferometric mould
In block, fiber optic interferometric module produces interference signal, inputs to controller module, and controller module uses WELCH algorithm, obtains
The power ratio of the signal power of this frequency and modulated signal, in completing the scope of application after the detection of all Frequency points, signal power
It is delustring frequency than minimum Frequency point, delustring frequency substitution formula is calculated fiber lengths.
Claims (5)
1. optical fiber length measuring system, it is characterised in that:
Including fiber optic interferometric module, controller module and DDS module；One road input of described fiber optic interferometric module is with to be measured
Optical fiber is connected, and the outfan of described fiber optic interferometric module is connected with controller module；Described controller module is defeated with DDS module
Enter end to be connected；The outfan of described DDS module is connected with another road input of fiber optic interferometric module.
Optical fiber length measuring system the most according to claim 1, it is characterised in that: farther include display module, described
Display module is connected with controller module.
Optical fiber length measuring system the most according to claim 1, it is characterised in that: farther include memory module, institute
State memory module to be connected with controller module.
Optical fiber length measuring system the most according to claim 1, it is characterised in that: described fiber optic interferometric module includes laser
Device, photonic module, detector, piezoelectric ceramics and transmitting mirror；Described transmitting mirror is connected with testing fiber；Described piezoelectric ceramics with treat
Light-metering line is connected, and described piezoelectric ceramics is connected with the outfan of DDS module, and described piezoelectric ceramics is connected with optical module；Described light
Module is connected with the outfan of laser instrument, and the outfan of described optical module is connected with the input of detector.
Optical fiber length measuring system the most according to claim 4, it is characterised in that: described photonic module is 3*3 bonder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610671296.9A CN106197289A (en) | 2016-08-15 | 2016-08-15 | Optical fiber length measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610671296.9A CN106197289A (en) | 2016-08-15 | 2016-08-15 | Optical fiber length measuring system |
Publications (1)
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| CN106197289A true CN106197289A (en) | 2016-12-07 |
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| CN201610671296.9A Pending CN106197289A (en) | 2016-08-15 | 2016-08-15 | Optical fiber length measuring system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1052369A (en) * | 1990-12-29 | 1991-06-19 | 清华大学 | Multi-way reused laser frequency modulation heterodyne interference optical fiber measuring instrument |
| CN2513077Y (en) * | 2001-09-12 | 2002-09-25 | 复旦大学 | Interference type optic fibre length measurer |
| US20030160967A1 (en) * | 2002-02-27 | 2003-08-28 | Houston Brian H. | Nanoscale vibrometric measurement apparatus and method |
| CN2681083Y (en) * | 2004-02-24 | 2005-02-23 | 华中科技大学 | Fiber bundle displacement transducer |
| US20060132797A1 (en) * | 2004-12-17 | 2006-06-22 | Hon Hai Precision Industry Co., Ltd. | Method and apparatus for measuring thickness of thin article |
| CN101013025A (en) * | 2007-02-09 | 2007-08-08 | 北京交通大学 | Optical fiber interference type on-line micro-displacement measuring system using fibre grating |
| CN103489275A (en) * | 2013-08-29 | 2014-01-01 | 上海复旦智能监控成套设备有限公司 | Monitoring circuit and method for improving long-distance monitoring locating accuracy of optical fibers |
-
2016
- 2016-08-15 CN CN201610671296.9A patent/CN106197289A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1052369A (en) * | 1990-12-29 | 1991-06-19 | 清华大学 | Multi-way reused laser frequency modulation heterodyne interference optical fiber measuring instrument |
| CN2513077Y (en) * | 2001-09-12 | 2002-09-25 | 复旦大学 | Interference type optic fibre length measurer |
| US20030160967A1 (en) * | 2002-02-27 | 2003-08-28 | Houston Brian H. | Nanoscale vibrometric measurement apparatus and method |
| CN2681083Y (en) * | 2004-02-24 | 2005-02-23 | 华中科技大学 | Fiber bundle displacement transducer |
| US20060132797A1 (en) * | 2004-12-17 | 2006-06-22 | Hon Hai Precision Industry Co., Ltd. | Method and apparatus for measuring thickness of thin article |
| CN101013025A (en) * | 2007-02-09 | 2007-08-08 | 北京交通大学 | Optical fiber interference type on-line micro-displacement measuring system using fibre grating |
| CN103489275A (en) * | 2013-08-29 | 2014-01-01 | 上海复旦智能监控成套设备有限公司 | Monitoring circuit and method for improving long-distance monitoring locating accuracy of optical fibers |
Non-Patent Citations (1)
| Title |
|---|
| 李楚瑞，王超，肖倩: "基于全光纤干涉的新型光纤长度测量系统", 《仪器仪表学报》 * |
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Application publication date: 20161207 |
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