CN204287119U - Four-way FBG ultrasonic testing system - Google Patents
Four-way FBG ultrasonic testing system Download PDFInfo
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- CN204287119U CN204287119U CN201420751355.XU CN201420751355U CN204287119U CN 204287119 U CN204287119 U CN 204287119U CN 201420751355 U CN201420751355 U CN 201420751355U CN 204287119 U CN204287119 U CN 204287119U
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Abstract
A kind of four-way FBG ultrasonic testing system, it comprises the different distributed feedback laser of four centre wavelength, and what be connected by optical fiber with distributed feedback laser is 1 × 4 fiber coupler; 1 × 4 fiber coupler outputs signal to the one 1 × 2 fiber coupler; C-band ASE light source outputs signal to the little one end of the one 1 × 2 fiber coupler coupling ratio; One 1 × 2 coupling mechanism outputs signal to optical fiber circulator, the Fiber connection of the FBG grating that optical fiber circulator common port and one section of inscription have four centre wavelength different, the wavelength one_to_one corresponding of the wavelength of four FBG gratings and four distributed feedback laser; Optical fiber circulator output terminal outputs signal to four-way optical fibre wavelength division multiplexer through the 21 × 2 fiber coupler, and spectroanalysis instrument connects the little one end of the 21 × 2 fiber coupler coupling ratio; Four-way optical fibre wavelength division multiplexer outputs signal to four photodetectors, and the electrical signal of photodetector is connected with oscillograph and four road PID control circuits respectively by BNC threeway; Four road PID control circuits are connected the four-way Ultrasonic Detection function that feedback adjusting signal realizes based on FBG with four distributed feedback laser.
Description
Technical field
The utility model relates to a kind of four-way FBG ultrasonic testing system, especially for the long distance monitoring of buildings, belongs to Ultrasonic NDT and evaluation field.
Background technology
Buildings as bridge, skyscraper, large-span space structure, dam etc., general bulky and tenure of use longer, its safety monitoring is the important subject of domestic and international project field extensive concern always.The use of buildings can produce strain, and the stretching strain value that strain long term accumulation exceedes permission can produce crack, and produce crack and can inspire ultrasound wave simultaneously, ultrasound wave has the multiple wave modes such as surface wave, compressional wave and shear wave.In the ultrasound wave that crack inspires, compressional wave can cause the larger change of FBG optical grating reflection rate, and sensitivity is higher.The crack ultrasound wave of Distributed FBG Grating examinations buildings overcomes that the life-span of conventional electrical measurement fax method is short, electromagnetism interference is poor, the drawback such as large affected by environment.Up to the present the long distance ultrasonic testing system based on FBG grating technology being applied to buildings is not also had.
Summary of the invention
The utility model provides a kind of four-way FBG ultrasonic testing system based on FBG grating technology.
The technical scheme that the utility model adopts is: a kind of four-way FBG ultrasonic testing system, and it comprises the different distributed feedback laser (Laser) of four centre wavelength, and what be connected by optical fiber with distributed feedback laser is 1 × 4 fiber coupler; 1 × 4 fiber coupler outputs signal to the one 1 × 2 fiber coupler; C-band ASE light source outputs signal to the little one end of the one 1 × 2 fiber coupler coupling ratio; One 1 × 2 coupling mechanism outputs signal to optical fiber circulator, optical fiber circulator common port is connected with light-sensitive optical fibre, light-sensitive optical fibre is inscribed and has the FBG grating that four centre wavelength is different, the wavelength one_to_one corresponding of the wavelength of four FBG gratings and four distributed feedback laser; Optical fiber circulator output terminal outputs signal to four-way optical fibre wavelength division multiplexer (Dense Wavelenth Division Multiplexing, DWDM) through the 21 × 2 fiber coupler, and spectroanalysis instrument connects the little one end of the 21 × 2 fiber coupler coupling ratio; Four-way optical fibre wavelength division multiplexer outputs signal to four photodetector (Photodetector, PD), the electrical signal of photodetector by BNC(snap-fit connector, Bayonet Nut Connector) threeway is connected with oscillograph and four road PID control circuits respectively; Four road PID control circuits are connected the four-way Ultrasonic Detection function that feedback adjusting signal realizes based on FBG with four distributed feedback laser.
The concrete feature of this programme also has, and the continuous laser energy that described distributed feedback laser is launched is 20 mW, and wavelength is respectively 1540.56 nm, 1545.32 nm, 1550.12 nm and 1554.94 nm.
Four FBG gratings (Fiber Bragg Grating FBG, Fibre Bragg Grating) are connected mutually, and the wavelength of FBG optical grating reflection changes with the hyperacoustic vibration of measurand.
Four road PID control circuit (proportional-integral-differential, Proportional-integral-derivative) for the output wavelength of feedback regulation continuous wave laser, object is that the reflection wavelength relative position of wavelength and the corresponding FBG that laser instrument is exported is constant, thus realizes low frequency locking.
C-band (wavelength coverage 1528-1561 nm) ASE(Amplified Spontaneous Emission) light source, oscillograph (Oscilloscope) and spectroanalysis instrument (Optical Spectrum Analyzer, OSA), the distributed feedback laser that four centre wavelength is different, wavelengthtunable semiconductor laser, for providing continuous light for four sense channels.C-band ASE light source and spectroanalysis instrument are dismountable after system debug, and whole detection system is light.
The beneficial effects of the utility model are: the FBG grating of four different wave lengths is sensors of detection signal, and FBG grating wavelength corresponds to tunable laser wavelength.According to detection needs, what four FBG gratings can be connected is scribed on light-sensitive optical fibre, determines the inscription position of four FBG gratings according to the shape of measured object.Be loaded with the common port of light-sensitive optical fibre access at optical fiber circulator of four FBG gratings, when crackle appears in measured object, ultrasound wave causes FBG optical grating reflection rate to change, and causes photodetector output signal to change, thus on oscillograph, shows the ultrasound wave detected.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is four-way FBG ultrasonic testing system theory diagram.Fig. 2 is four-way FBG ultrasonic testing system package layout figure.Fig. 3 is four-way FBG ultrasonic testing system guidance panel interface schema.Fig. 4 is four-way FBG ultrasonic testing system external instrument connection layout.Fig. 5 is FBG grating buildings scheme of installation.
In figure: 1-distributed feedback laser, 2-fiber cable box, 3-photodetector, 4-tetra-road PID control circuit, 5-optical fibre wavelength division multiplexer, 6-Switching Power Supply, 7-power switch, 8-oscillograph interface, 9-spectroanalysis instrument interface, 10-C wave band ASE light source interface, 11-FBG grating interface, 12-oscillograph, 13-spectroanalysis instrument, 14-FBG grating, 15-C wave band ASE light source, 16-four-way FBG ultrasonic testing system encapsulation instrument.
Embodiment
As shown in Fig. 1, a kind of four-way FBG ultrasonic testing system, it comprises the different distributed feedback laser of four centre wavelength, and what be connected by optical fiber with distributed feedback laser is 1 × 4 fiber coupler; 1 × 4 fiber coupler outputs signal to the one 1 × 2 fiber coupler; C-band ASE light source outputs signal to the little one end of the coupling ratio of the one 1 × 2 fiber coupler; One 1 × 2 coupling mechanism outputs signal to optical fiber circulator, optical fiber circulator common port is connected with light-sensitive optical fibre, light-sensitive optical fibre is inscribed and has the FBG grating that four centre wavelength is different, the wavelength one_to_one corresponding of the wavelength of four FBG gratings and four distributed feedback laser; Optical fiber circulator output terminal outputs signal to four-way optical fibre wavelength division multiplexer through the 21 × 2 fiber coupler, and spectroanalysis instrument connects the little one end of the 21 × 2 fiber coupler coupling ratio; Four-way optical fibre wavelength division multiplexer outputs signal to four photodetectors, and the electrical signal of photodetector is connected with oscillograph and four road PID control circuits respectively by BNC threeway; Four road PID control circuits are connected the four-way Ultrasonic Detection function that feedback adjusting signal realizes based on FBG with four distributed feedback laser.
When buildings occurs that crackle inspires ultrasound wave, make the FBG optical grating reflection rate being bonded in building wall that larger change occur, this change is delivered to photodetector and changes accordingly, the electric signal of change is transferred to oscillograph and PID control circuit by photodetector respectively, PID control circuit feedback regulation laser device laser output wavelength, systems stabilisation, oscilloscope display detects ultrasonic signal.
The continuous laser energy that described distributed feedback laser is launched is 20 mW, and wavelength is respectively 1540.56 nm, 1545.32 nm, 1550.12 nm and 1554.94 nm.Distributed feedback laser, model is respectively Orcon Corp. WSLS-928013C1424-45, output wavelength 1554.94 ± 0.1 nm, and Output optical power is 20 mW; WSLS-934013C1424-45, output wavelength 1550.12 ± 0.1 nm, Output optical power is 20 mW; WSLS-940013C1424-45, output wavelength 1545.32 ± 0.1 nm, Output optical power is 20 mW; WSLS-946013C1424-45, output wavelength 1540.56 ± 0.1 nm, Output optical power is 20 mW.
Described optical fibre wavelength division multiplexer model is Beijing 10,000,000,000 wavelength-division company four-way DWDM module, and the wavelength that four paths are corresponding is respectively 1554.94 ± 0.11 nm, 1550.12 ± 0.11 nm, 1545.32 ± 0.11 nm, 1540.56 ± 0.11 nm.
Described photodetector refers to model Thorlabs company DET10C/M, and broadband DC coupling exports, bandwidth 700-1800 nm, rise time 10 ns, workspace 0.8 mm
2, NEP(noise equivalent power) better.
Described C-band ASE light source refers to the VASP-Er-C-B-200-1 of model Shanghai Han Yu company, the inclined wideband light source of desk-top guarantor, single channel, bandwidth range 1528-1561 nm, spectral flatness≤7 dB, output power adjustable extent 0-100%, output power >=200 mW.
Described spectroanalysis instrument refers to model YOKOGAWA company AQ6370, and oscillograph refers to the MSO7054B of model Agilent company.1 × 2 coupling mechanism beam splitting ratio is 10:90.
Described four road PID control circuits, carry out P adjustment to every road PID control circuit respectively, the distributed feedback laser output wavelength that adjustment is corresponding, make corresponding distributed feedback laser peak value be positioned at the-3dB place of C-band ASE light source reflectance spectrum peak.
Described four FBG gratings 14 are scribed on same light-sensitive optical fibre, mutually connect.Figure 5 shows that the mounting means of FBG grating 14 on buildings, select hard metope, select epoxide-resin glue or 502 glue to be bonded on hard metope, four FBG gratings 14 are bonded in buildings four sides respectively.
Fig. 2 and the four-way FBG ultrasonic testing system that Figure 3 shows that encapsulation, comprise the power supply 6 that opens the light and power; Four centre wavelength various lasers 1; Fiber cable box 2, is fixed with 1 × 4 fiber coupler in fiber cable box 2, two 1 × 2 fiber couplers; An optical fibre wavelength division multiplexer 5; Four photodetectors 4; Four oscillograph interfaces, 8, spectroanalysis instrument interface, 9, C-band ASE light source interface, 10, FBG grating interface 11 is had at instrumentation panel interface.
Shown in Fig. 4 and Fig. 5, in detection system encapsulation instrument 16 guidance panel, the FBG grating 14 being bonded in buildings four sides connects FBG grating interface 11, the output terminal of C-band ASE light source 15 connects C-band ASE light source interface 10 by optical fiber, spectroanalysis instrument 13 signal input part connects spectroanalysis instrument interface 9 by optical fiber, oscillograph 12 4 passages connect four oscillograph interfaces 8 by BNC coaxial cable, in this way, erect a kind of based on FBG grating technology four-way ultrasonic testing system.
Claims (3)
1. a four-way FBG ultrasonic testing system, it comprises the different distributed feedback laser of four centre wavelength, and what be connected by optical fiber with distributed feedback laser is 1 × 4 fiber coupler; 1 × 4 fiber coupler outputs signal to the one 1 × 2 fiber coupler; C-band ASE light source outputs signal to the little one end of the one 1 × 2 fiber coupler coupling ratio; One 1 × 2 coupling mechanism outputs signal to optical fiber circulator, optical fiber circulator is three port types, optical fiber circulator common port is connected with light-sensitive optical fibre, light-sensitive optical fibre is inscribed and has the FBG grating that four centre wavelength is different, the wavelength one_to_one corresponding of the wavelength of four FBG gratings and four distributed feedback laser; Optical fiber circulator output terminal outputs signal to four-way optical fibre wavelength division multiplexer through the 21 × 2 fiber coupler, and spectroanalysis instrument connects the little one end of the 21 × 2 fiber coupler coupling ratio; Four-way optical fibre wavelength division multiplexer outputs signal to four photodetectors, and the electrical signal of photodetector is connected with oscillograph and four road PID control circuits respectively by BNC threeway; Four road PID control circuits are connected the four-way Ultrasonic Detection function that feedback adjusting signal realizes based on FBG with four distributed feedback laser.
2. four-way FBG ultrasonic testing system according to claim 1, it is characterized in that the continuous laser energy that described distributed feedback laser is launched is 20 mW, wavelength is respectively 1540.56 nm, 1545.32 nm, 1550.12 nm and 1554.94 nm.
3. four-way FBG ultrasonic testing system according to claim 1, is characterized in that 4 FBG gratings are connected mutually.
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| CN201420751355.XU CN204287119U (en) | 2014-12-04 | 2014-12-04 | Four-way FBG ultrasonic testing system |
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| CN201420751355.XU CN204287119U (en) | 2014-12-04 | 2014-12-04 | Four-way FBG ultrasonic testing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613732A (en) * | 2018-07-10 | 2018-10-02 | 广东省计量科学研究院（华南国家计量测试中心） | A kind of ultrasound imitates the acoustic velocity measurement device of material in Tissue Phantom |
-
2014
- 2014-12-04 CN CN201420751355.XU patent/CN204287119U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613732A (en) * | 2018-07-10 | 2018-10-02 | 广东省计量科学研究院（华南国家计量测试中心） | A kind of ultrasound imitates the acoustic velocity measurement device of material in Tissue Phantom |
| CN108613732B (en) * | 2018-07-10 | 2024-02-20 | 广东省计量科学研究院（华南国家计量测试中心） | Sound velocity measuring device for material in ultrasonic tissue-imitating model |
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