CN107422044A - A kind of matching Fiber Bragg Grating FBG of transmission-type surveys ultrasonic signal sensor-based system - Google Patents
A kind of matching Fiber Bragg Grating FBG of transmission-type surveys ultrasonic signal sensor-based system Download PDFInfo
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- CN107422044A CN107422044A CN201710788810.1A CN201710788810A CN107422044A CN 107422044 A CN107422044 A CN 107422044A CN 201710788810 A CN201710788810 A CN 201710788810A CN 107422044 A CN107422044 A CN 107422044A
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- bragg grating
- fiber bragg
- grating fbg
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- transmission
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/32—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise
- G01N29/326—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise compensating for temperature variations
Abstract
The invention provides a kind of matching Fiber Bragg Grating FBG of transmission-type to survey ultrasonic signal sensor-based system, including ASE wideband light sources, optical fiber circulator, sensor fibre Bragg grating, match Fiber Bragg Grating FBG, photodetection circuit module, preamplifier circuit module, Data Acquisition Card, FPGA and computer；The advantages that present invention is mainly used for the Non-Destructive Testing of aerospace flight vehicle structural member, has high sensitivity, and penetration power is strong, fast response time, long transmission distance, and anti-electromagnetic interference capability is strong；The present invention surveys ultrasonic signal method for sensing using the matching Fiber Bragg Grating FBG of transmission-type, the matching Fiber Bragg Grating FBG of system can effectively reduce influence of the temperature change to sensor fibre Bragg grating, improve the stability of a system and accuracy of detection, simultaneity factor uses ASE wideband light sources, system cost is reduced, beneficial to practical engineering application.
Description
Technical field
The invention belongs to ultrasonic detection technology field, the matching Fiber Bragg Grating FBG of more particularly to a kind of transmission-type is surveyed
Ultrasonic signal sensor-based system.
Background technology
Ultrasonic wave is the mechanical wave that a kind of vibration frequency is higher than sound wave.Supersonic detection for structural part defect technology is exactly to use
The signal that highly sensitive ultrasonic sensor collection is sent from ultrasonic probe, and pass through the width to these ultrasonic signals
The parameters such as value, time, waveform change understand the state of development of structural member defect, to realize the inspection to structural member health status
Survey.Due to the advantages that penetration capacity of ultrasonic detection technology is strong, high sensitivity, universality so that it is in Aero-Space, railway
The in-service safety inspection in the fields such as traffic, boilers and pressure vessel and life appraisal are widely used.
Fiber Bragg Grating FBG is the light sensitivity using fiber optic materials, and periodically variable refraction is produced in fiber core
Rate is distributed, and it is substantially that a narrow band filter or speculum are formed in fibre core that it, which is acted on,.Broadband light enters optical fiber Bragg
Grating, only meeting the very narrow light of its conditioned reflex could be reflected back by Fiber Bragg Grating FBG.Due to optical fiber Bragg
The electromagnetism interference of grating, corrosion-resistant, high sensitivity, to electric insulation, cost it is low and the advantages that be easily achieved multiplexing, optical fiber Bradley
Lattice grating is just played a significant role in sensory field of optic fibre once appearance, and highway, bridge, mine, geological prospecting,
Railway, oil, natural gas line monitoring structural health conditions in be used widely.
Existing fiber grating sensing system such as Chinese patent CN200610130121.3 " fiber grating sensing system ",
CN200920129512.2 " a kind of fiber-optic grating sensor and fiber grating sensing system " can simultaneously measurement temperature with should
Become；Existing grating ultrasonic wave detecting system such as Chinese patent CN201420775445.2 " is locally put for power network electrical equipment
The ultrasonic wave detecting systems such as the Fiber Bragg Grating FBG ultrasonic wave detecting system of electro-detection " are suitable to detect under isoperibol, if
Variation of ambient temperature is larger, then can influence Fiber Bragg Grating FBG accuracy of detection.
The content of the invention
It is an object of the present invention to overcome existing technology to limit to, matching Fiber Bragg Grating FBG is introduced into ultrasonic wave inspection
Survey field, there is provided a kind of matching Fiber Bragg Grating FBG of transmission-type surveys ultrasonic signal sensor-based system, and the system has inspection
Survey high sensitivity, precision are high, penetration power is strong, not by electromagnetic interference, suitable for dynamic and Static Detection, suitable for constant temperature and varying temperature environment work
The features such as making.
Technical scheme：A kind of matching Fiber Bragg Grating FBG of transmission-type surveys ultrasonic signal sensor-based system,
The sensor-based system includes ASE wideband light sources, optical fiber circulator, sensor fibre Bragg grating, matches Fiber Bragg Grating FBG,
Photodetection circuit module, preamplifier circuit module, Data Acquisition Card, FPGA and computer；Wherein, optical fiber circulator
A ports and B ports connect ASE wideband light sources and sensor fibre Bragg grating, C-terminal mouth matching connection optical fiber Bragg light respectively
Grid；The broadband light that ASE wideband light sources are sent reaches sensor fibre Bragg grating by optical fiber circulator, meets optical fiber Bragg
The narrow band light of grating condition returns to optical fiber circulator from sensor fibre Bragg grating, enters back into matching optical fiber Bragg light
Grid；Electric signal is converted into by photodetection circuit module from the optical signal of matching Fiber Bragg Grating FBG transmission, electric signal enters
Enter preamplifier circuit module to be amplified, the electric signal after amplification enters FPGA demodulation letters after gathering by Data Acquisition Card
Number, ultrasound information is drawn, is finally analyzed and is shown on computers.
Further, the ASE wideband light sources, centre wavelength 1545nm, three dB bandwidth 40nm.
Further, the optical fiber circulator, operation wavelength are 1550 ± 20nm.
Further, the matching Fiber Bragg Grating FBG, to match with sensor fibre Bragg grating, that is, match light
The 3dB points of fine Bragg grating intersect with the 3dB points of sensor fibre Bragg grating, and require two gratings reflectivity,
While it is basically identical to touch the parameters such as rejection ratio, three dB bandwidth.
Further, the photodetection circuit module is semiconductor InGaAs PIN-type photodiode circuit modules.
Further, the preamplifier circuit module, with a width of 20kHz -1200kHz, more than signal to noise ratio 50dB.
The present invention compared with prior art the advantages of be：Existing fiber Bragg grating sensor detection ultrasonic wave passes
Most of sensing system is all operated under constant temperature or the less environment of temperature change, once variation of ambient temperature is larger, optical fiber Bradley
The detection ultrasonic signal precision of lattice grating will reduce, and influence final detection result, and the present invention is using transmission-type matching light
Fine Bragg grating detects ultrasonic signal sensor-based system, and system has totally 2 Fiber Bragg Grating FBGs, one of as matching
Fiber Bragg Grating FBG, another realizes real time temperature self compensation as sensor fibre Bragg grating, can be to greatest extent
Reduce influence of the temperature to sensor fibre Bragg grating sensor so that sensor fibre Bragg grating sensor is in alternating temperature ring
Equally there is the ability of normal work under border；In addition the system is transmission-type, i.e., collection is through matching Fiber Bragg Grating FBG
Optical signal can obtain ultrasound information, and realization principle is simple, and detection ultrasonic wave effect is preferable.
Brief description of the drawings
Fig. 1 is that the matching Fiber Bragg Grating FBG of transmission-type surveys the schematic diagram of ultrasonic signal sensor-based system；
In figure：1 is ASE wideband light sources, and 2 be optical fiber circulator, and 3 be sensor fibre Bragg grating, and 4 be matching optical fiber cloth
Glug grating, 5 be photodetection circuit module, and 6 be preamplifier circuit module, and 7 be Data Acquisition Card, and 8 be FPGA, and 9 are
Computer；
Embodiment
The embodiment of the present invention is described below in conjunction with the accompanying drawings, to more fully understand the present invention.Need
Especially point out, in the following description, when perhaps the detailed description using known function and design can desalinate this hair
During bright main contents, these descriptions will be ignored herein.
As shown in figure 1, the matching Fiber Bragg Grating FBG of transmission-type of the present invention surveys ultrasonic signal sensor-based system
Including：
ASE wideband light sources 1, optical fiber circulator 2, sensor fibre Bragg grating 3, match Fiber Bragg Grating FBG 4, photoelectricity
Detection circuit module 5, preamplifier circuit module 6, Data Acquisition Card 7, FPGA 8, computer 9；Wherein, optical fiber circulator 2
A ports and B ports connect ASE wideband light sources 1 and sensor fibre Bragg grating 3, C-terminal mouth matching connection optical fiber Bradley respectively
Lattice grating 4；Match Fiber Bragg Grating FBG 4 and preamplifier circuit module 6 is accessed by photodetection circuit module 5, it is preposition
Amplifier circuit module 6 accesses Data Acquisition Card 7, and the signal that Data Acquisition Card 7 comes out is connected with FPGA8 and computer 9 successively.
The broadband light that ASE wideband light sources 1 are sent reaches sensor fibre Bragg grating 3 by optical fiber circulator 2, meets light
The narrow band light of fine Bragg grating condition returns to optical fiber circulator 2 from sensor fibre Bragg grating 3, enters back into matching light
Fine Bragg grating 4；The optical signal transmitted from matching Fiber Bragg Grating FBG 4 is converted into electricity by photodetection circuit module 5
Signal, electric signal are amplified into preamplifier circuit module 6, and the electric signal after amplification is gathered by Data Acquisition Card 7
Enter FPGA8 demodulated signals afterwards, draw ultrasound information, finally analyzed and shown on computer 9.
The ASE wideband light sources 1 are amplified spontaneous emission wideband light source.Wideband light source is with gain media in doped fiber
Superfluorescence spectrum based on light source, its driving source entirely from excited atom spontaneous radiation, although in fiber amplifier
There is no resonator mirror, these spontaneous radiations can not form laser beam, still, can be along light in the event of spontaneous radiation in a fiber
Fibre conduction, spontaneous radiation can just be exaggerated, just produce a kind of ambient noise, turn into amplified spontaneous emission, so as to form ASE light
Source.It, which has, is easy to and grating sensing system coupling, the series of advantages such as temperature stability is good, 3dB spectrum widths are wide, pattern is good.This
Invention wideband light source used flatness in spectral region is good, centre wavelength 1545nm, three dB bandwidth 40nm.
The optical fiber circulator 2, operation wavelength are 1550 ± 20nm, and the light that wideband light source is sent passes through optical fiber circulator 2
Sensor fibre Bragg grating 3 is injected, the light that sensor fibre Bragg grating 3 returns injects matching light by fine circulator 2 again
Fine Bragg grating 4；The matching Fiber Bragg Grating FBG 4, will match with sensor fibre Bragg grating 3, that is, match light
The 3dB points of fine Bragg grating 4 intersect with the 3dB points of sensor fibre Bragg grating 3, and require the reflection of two gratings
Than, that the parameters such as rejection ratio, three dB bandwidth are touched on side is basically identical.
The photodetection circuit module 5 converts optical signal into electric signal, is the key of whole system performance height
One.Sensor-based system described in the present embodiment, optical signal from wideband light source 1 after a series of optical fibre channels, device, interface, light
Power attenuation is bigger, and the luminous power for inciding photodetector generally all only has nW magnitudes；The present embodiment require again high frequency and
High-precision photoelectric conversion.Photoelectric conversion is carried out with semiconductor InGaAs PIN photodiodes in the present embodiment, it has inclined
Put the advantages that voltage is low, frequency response is high, spectral response is wide, photoelectric transformation efficiency is high, and stability is good, noise is small.
The preamplifier circuit module 6, play a part of amplifying the electric signal after opto-electronic conversion.Due to required
The electric signal of amplification belongs to wideband small-signal, therefore need to select with wide, the high pre-amplification circuit module of signal to noise ratio.The present invention
Preamplifier circuit module 6 used, with a width of 20kHz -1200kHz, more than signal to noise ratio 50dB.
The FPGA 8 plays a part of being filtered the data signal collected, demodulated.Applied in the present embodiment
FPGA has abundant trigger and I/O pins, and chip integration is high, and the design cycle is short, and development cost are low, and stable performance can
Lean on.
Although the illustrative embodiment of the present invention is described above, in order to the technology people of this technology neck
Member understands the present invention, it should be apparent that the invention is not restricted to the scope of embodiment, to the ordinary skill of the art
For personnel, as long as various change, in the spirit and scope of the present invention that appended claim limits and determines, these become
Change is it will be apparent that all utilize the innovation and creation of present inventive concept in the row of protection.
Claims (6)
1. a kind of matching Fiber Bragg Grating FBG of transmission-type surveys ultrasonic signal sensor-based system, it is characterized in that：The sensing system
System includes ASE wideband light sources (1), optical fiber circulator (2), sensor fibre Bragg grating (3), matches Fiber Bragg Grating FBG
(4), photodetection circuit module (5), preamplifier circuit module (6), Data Acquisition Card (7), FPGA (8) and computer
(9)；Wherein, the A ports of optical fiber circulator (2) and B ports connect ASE wideband light sources (1) and sensor fibre Prague light respectively
Grid (3), C-terminal mouth matching connection Fiber Bragg Grating FBG (4)；The broadband light that ASE wideband light sources (1) are sent passes through optical fiber circulator
(2) sensor fibre Bragg grating (3) is reached, meets the narrow band light of Fiber Bragg Grating FBG condition from sensor fibre Prague light
Grid (3) return to optical fiber circulator (2), enter back into matching Fiber Bragg Grating FBG (4)；From matching Fiber Bragg Grating FBG
(4) optical signal of transmission is converted into electric signal by photodetection circuit module (5), and electric signal enters preamplifier circuit mould
Block (6) is amplified, and the electric signal after amplification enters FPGA demodulated signals after being gathered by Data Acquisition Card (7), draws ultrasound
Ripple information, finally analyzed and shown on computer (9).
2. a kind of matching Fiber Bragg Grating FBG of transmission-type according to claim 1 surveys ultrasonic signal sensor-based system,
It is characterized in that：The ASE wideband light sources (1), centre wavelength 1545nm, three dB bandwidth 40nm.
3. a kind of matching Fiber Bragg Grating FBG of transmission-type according to claim 1 surveys ultrasonic signal sensor-based system,
It is characterized in that：The optical fiber circulator (2), operation wavelength are 1550 ± 20nm.
4. a kind of matching Fiber Bragg Grating FBG of transmission-type according to claim 1 surveys ultrasonic signal sensor-based system,
It is characterized in that：The matching Fiber Bragg Grating FBG (4), will match with sensor fibre Bragg grating (3), that is, match optical fiber
The 3dB points of Bragg grating (4) intersect with the 3dB points of sensor fibre Bragg grating (3), and require the reflection of two gratings
Than, that rejection ratio, three dB bandwidth parameter are touched in side is basically identical.
5. a kind of matching Fiber Bragg Grating FBG of transmission-type according to claim 1 surveys ultrasonic signal sensor-based system,
It is characterized in that：The photodetection circuit module (5) is semiconductor InGaAs PIN-type photodiode circuit modules.
6. a kind of matching Fiber Bragg Grating FBG of transmission-type according to claim 1 surveys ultrasonic signal sensor-based system,
It is characterized in that：The preamplifier circuit module (6), with a width of 20kHz -1200kHz, more than signal to noise ratio 50dB.
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| CN201710788810.1A CN107422044A (en) | 2017-09-05 | 2017-09-05 | A kind of matching Fiber Bragg Grating FBG of transmission-type surveys ultrasonic signal sensor-based system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110823359A (en) * | 2019-11-14 | 2020-02-21 | 北京遥测技术研究所 | Low-temperature optical fiber sound sensing system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680582A (en) * | 2012-06-07 | 2012-09-19 | 北京航空航天大学 | Matching fiber grating acoustic emission sensing system with temperature compensation function |
| JP2015040697A (en) * | 2013-08-20 | 2015-03-02 | 三菱日立パワーシステムズ株式会社 | Ultrasonic flaw detection sensor and ultrasonic flaw detection method |
| CN105842345A (en) * | 2016-04-15 | 2016-08-10 | 重庆邮电大学 | Method for positioning structural multiple cracks through fiber Bragg grating sensor network |
-
2017
- 2017-09-05 CN CN201710788810.1A patent/CN107422044A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680582A (en) * | 2012-06-07 | 2012-09-19 | 北京航空航天大学 | Matching fiber grating acoustic emission sensing system with temperature compensation function |
| JP2015040697A (en) * | 2013-08-20 | 2015-03-02 | 三菱日立パワーシステムズ株式会社 | Ultrasonic flaw detection sensor and ultrasonic flaw detection method |
| CN105842345A (en) * | 2016-04-15 | 2016-08-10 | 重庆邮电大学 | Method for positioning structural multiple cracks through fiber Bragg grating sensor network |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110823359A (en) * | 2019-11-14 | 2020-02-21 | 北京遥测技术研究所 | Low-temperature optical fiber sound sensing system |
| CN110823359B (en) * | 2019-11-14 | 2021-08-10 | 北京遥测技术研究所 | Low-temperature optical fiber sound sensing system |
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Application publication date: 20171201 |
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