CN101968391A - Aplanatic fiber Bragg grating pressure sensor - Google Patents
Aplanatic fiber Bragg grating pressure sensor Download PDFInfo
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- CN101968391A CN101968391A CN 201010294775 CN201010294775A CN101968391A CN 101968391 A CN101968391 A CN 101968391A CN 201010294775 CN201010294775 CN 201010294775 CN 201010294775 A CN201010294775 A CN 201010294775A CN 101968391 A CN101968391 A CN 101968391A
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Abstract
The invention discloses an aplanatic fiber Bragg grating pressure sensor. Light beams radiated by an ASE (amplified spontaneous emission) wide spectrum light source of the sensor pass through a light circulator and then enter a fiber Bragg grating, the light beams meeting the Bragg diffraction condition are reflected by the fiber Bragg grating, then the light beams pass through a 3*3 optical coupler and a 2*2 optical coupler and are reflected by a fiber coupling reflector and returned according to the original path, and the light beams pass through the 2*2 optical coupler and the 3*3 optical coupler again and then enter two photoelectric detectors. Optical signals of each 3*3 optical coupler are stack of four paths of light beams, wherein the two paths of light beams with optical path difference of zero are subjected to coherence stack, and the rest any two beams are subjected to incoherence stack. An impact pressure can be obtained according the output signals of the two photoelectric detectors. The aplanatic fiber Bragg grating pressure sensor has the advantage of quick time response.
Description
Technical field
The invention belongs to the fiber sensor measuring technical field, be specifically related to a kind of sensor that utilizes the Bragg diffraction principle to measure surge pressure.
Background technology
In fields such as shock wave physics, detonation physics, dynamic high-pressure physics and high-energy-density physics, the surge pressure of GPa magnitude usually needs accurately to be measured as one of key parameter of research material kinetic property.The optical fiber Bragg grating pressure sensor that grows up with the Bragg diffraction principle has with respect to traditional electricity pressure sensing appliance makes advantages such as simple, that structure is small and exquisite, the response time is fast and anti-electromagnetic interference capability is strong, applicable to the percussive pressure force measurement.
Document＜measure surge pressure in the explosive with optical fiber Bragg grating pressure sensor〉(Van ' t Hof P. G., Cheng L. K., Schopltes J. H. G.,
Et al., Dynamic Pressure Measurement of Shock Waves in Explosives by Means of a Fiber Bragg Grating Sensor, 27
ThInternational congress on high-speed photography and photonics, Xi ' an China, September 17 ~ 22,2006[C] .) reported that the optical fiber Bragg grating pressure sensor that adopts the optical fiber Mach-Zehnder light channel structure measures the surge pressure in the explosive, institute's measuring pressure peak value is less than 1 GPa, and the response time of pressure transducer is about 100 ns.Because must satisfy the catoptrical coherent length of Fiber Bragg Grating FBG must be greater than this coherent condition of the optical path difference in the optical fiber Mach-Zehnder light channel structure, thereby cause this sensor to have the following disadvantages: the grid region length of Fiber Bragg Grating FBG can not be very short, the catoptrical coherent length of Fiber Bragg Grating FBG is directly proportional with the grid region length of Fiber Bragg Grating FBG, can not improve the response time of this sensor effectively, for the fast-response photodetector, main and grid region length of the response time of pressure transducer is inversely proportional to.
Summary of the invention
Adopt the optical fiber Mach-Zehnder light channel structure to measure slow problem time response of GPa magnitude surge pressure in order to solve existing optical fiber Bragg grating pressure sensor, the invention provides a kind of aplanatism optical fiber Bragg grating pressure sensor.
Aplanatism optical fiber Bragg grating pressure sensor of the present invention contains ASE(Amplified Spontaneous Emission) broad spectrum light source, light circulator, Fiber Bragg Grating FBG, 3 * 3 photo-couplers, 2 * 2 photo-couplers, postpone single-mode fiber, fibre coupled mirror, photodetector.ASE broad spectrum light source in the described sensor is connected with the A of light circulator end, the B end of light circulator is connected with Fiber Bragg Grating FBG, the C end of light circulator is connected with the E end of 3 * 3 photo-couplers, D end, the F end of 3 * 3 photo-couplers are connected with photodetector, photodetector respectively, the G end of 3 * 3 photo-couplers, I end are connected with J end, the K end of 2 * 2 photo-couplers respectively, be connected by postponing single-mode fiber between transmission node G, H, the L end of 2 * 2 photo-couplers is connected with the N end of fibre coupled mirror.
In the present invention, three of light circulator interfaces are connected with ASE broad spectrum light source, Fiber Bragg Grating FBG and 3 * 3 photo-couplers in certain sequence.Two interfaces of 3 * 3 photo-couplers, one end are connected with two photodetectors, and a remaining interface is by idle.Two interfaces of 3 * 3 photo-coupler other ends are connected with two interfaces of 2 * 2 photo-couplers, one end, and a remaining interface is by idle.An interface of 2 * 2 photo-coupler other ends is connected with the fibre coupled mirror end, and a remaining interface is by idle.The light beam that the ASE broad spectrum light source gives off, behind light circulator, enter Fiber Bragg Grating FBG, the fraction light that is reflected by Fiber Bragg Grating FBG passes through light circulator once more, along 3 * 3 photo-couplers, the transmission of 2 * 2 photo-couplers, returned by former road by a fibre coupled mirror reflection back, once more through 2 * 2 photo-couplers, 3 * 3 photo-couplers, enter two photodetectors, be converted into two path signal.
In the present invention, the live width of ASE broad spectrum light source is about 40 nm, and the length that postpones single-mode fiber can be regulated in submillimeter ~ rice order magnitude range; The grid region length of Fiber Bragg Grating FBG can be selected in 50 μ m ~ 20 mm scopes; 2 * 2 photo-couplers, 3 * 3 photo-couplers are pressed power-sharing light.
In pressure transducer of the present invention, light channel structure has symmetry and " comes and goes " characteristics, and the light signal that reaches each photodetector all is the stack of four road light beams, and wherein, the two-way optical path difference is that zero two-beam carries out coherence stack; Between remaining any two bundles all is non-coherent addition.
In pressure transducer of the present invention, the optical path difference between the two paths of signals of participation coherence stack is zero, and the catoptrical coherent length of Fiber Bragg Grating FBG of any grid region length is all greater than the optical path difference in the light channel structure.Therefore, pressure transducer of the present invention can be selected the Fiber Bragg Grating FBG of very short grid region length, can improve significantly the response time of pressure transducer, thereby solve slow problem time response of existing optical fiber Bragg grating pressure sensor.
The existing relatively pressure transducer of pressure transducer of the present invention, its response time can be brought up to 10 ns magnitudes from 100 ns magnitudes, even the ns magnitude, can satisfy the demand of measuring fast surge pressure in the fields such as shock wave physics, detonation physics, dynamic high-pressure physics and high-energy-density physics.
Description of drawings
The structural representation of Fig. 1 pressure transducer of the present invention
1. broad spectrum light sources, 2. light circulators, 3. Fiber Bragg Grating FBGs, 4.3 * 3 photo-couplers 5. postpone single-mode fiber 6. 2 * 2 photo-couplers 7. fibre coupled mirror 8. photodetectors 9. photodetectors among the figure
A, B, C, D, E, F, G, H, I, J, K, L, M, N represent the node of optic path.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings.
Fig. 1 is an aplanatism optical fiber Bragg grating pressure sensor of the present invention.Pressure transducer of the present invention contains ASE broad spectrum light source 1, light circulator 2, Fiber Bragg Grating FBG 3,3 * 3 photo-couplers 4, postpones single- mode fiber 5,2 * 2 photo-couplers 6, fibre coupled mirror 7, photodetector 8 and photodetector 9.Its annexation is, ASE broad spectrum light source 1 is connected with the A end of light circulator 2, the B end of light circulator 2 is connected with Fiber Bragg Grating FBG 3, the C end of light circulator 2 is connected with the E end of 3 * 3 photo-couplers 4, and D end, the F end of 3 * 3 photo-couplers 4 are connected with photodetector 8, photodetector 9 respectively.The G end of 3 * 3 photo-couplers 4, I end are connected with J end, the K end of 2 * 2 photo-couplers 6 respectively.Between transmission node G, H, insert one and postponed single-mode fiber 5, introduced required optical path difference.The L end of 2 * 2 photo-couplers 6 is connected with the N end of fibre coupled mirror 7.Wherein the M end of the H of 3 * 3 photo-couplers 4 end, 2 * 2 photo-couplers 6 is by idle.
Among the present invention, pegging graft by ring flange between fiber optic element device and single-mode fiber, single-mode fiber and the single-mode fiber is connected.
Among the present invention, the light beam that ASE broad spectrum light source 1 is launched enters light circulator 2 from the A end, leaves from the B end, enters Fiber Bragg Grating FBG 3, and the fraction light that satisfies the Bragg diffraction condition is reflected, and remainder is fallen by transmission.The light beam that reflects from Fiber Bragg Grating FBG 3 enters the C end of light circulator 2 from the B end of light circulator 2, and imports 3 * 3 photo-couplers 4 into.3 * 3 photo-couplers 4 become three fens (a copy of it is by idle) with light beam by power-sharing, along two different paths transmission of GJ, IK, and are coupled into 2 * 2 photo-couplers 6.Be transferred to optical fiber coupled lens 7 by a branch of the two-beam of power-sharing (wherein a branch of) along the LN path from 2 * 2 photo-couplers 6 by idle, after its reflection, return by former road, behind 2 * 2 photo-couplers 6, the neither same path of JG, KH, 3 * 3 photo-couplers 4, the D that is positioned in 3 * 3 photo-couplers 4 holds, photodetector 8, the photodetector 9 of F end are converted to two path signal.
The light signal that reaches photodetector 8, photodetector 9 is the stack of four road light signals, and this four road light beam reaches photodetector 8 in the following manner, photodetector 9(represents with the light beam transmission node).
The optical path difference that pass-through mode (2), mode (3) reach between the light beam of photodetector 8, photodetector 9 is zero, carries out coherence stack; Pass-through mode (1), mode (4) reach between the light beam of photodetector 8, photodetector 9 can not coherence stack, can not carry out coherence stack with the light beam that pass-through mode (2), mode (3) reach photodetector 8, photodetector 9.
The ASE broad spectrum light source, the Fiber Bragg Grating FBG of the purple grid in Shanghai photoelectricity technology corporation, Ltd. production and the photodetector that Tek company produces that adopt Shanghai vast space Fibre Optical Communication Technology company limited to produce in the embodiments of the invention.The live width of ASE broad spectrum light source is about 40 nm, and power is operated in C-band greater than 100 mW; The centre wavelength of Fiber Bragg Grating FBG is 1545.5 nm, and grid region length is about 1 mm, and the centre wavelength reflectivity is greater than 90%; The operation wavelength of photodetector is between 1100 nm ~ 1650 nm, and gain is 1 V/mW, and live width is about 1.2 GHz.
Claims (2)
1. aplanatism optical fiber Bragg grating pressure sensor, it is characterized in that: the ASE broad spectrum light source (1) in the described sensor is connected with the A of light circulator (2) end, the B end of light circulator (2) is connected with Fiber Bragg Grating FBG (3), the C end of light circulator (2) is connected with the E end of 3 * 3 photo-couplers (4), the D end of 3 * 3 photo-couplers (4), F end respectively with photodetector (8), photodetector (9) is connected, the G end of 3 * 3 photo-couplers (4), I end respectively with the J end of 2 * 2 photo-couplers (6), the K end is connected, at transmission node G, be connected by postponing single-mode fiber (5) between the H, the L end of 2 * 2 photo-couplers (6) is connected with the N end of fibre coupled mirror (7).
2. aplanatism optical fiber Bragg grating pressure sensor according to claim 1 is characterized in that: the length of described delay single-mode fiber (5) is submillimeter ~ rice magnitude; The grid region length of Fiber Bragg Grating FBG is 50 μ m ~ 20 mm.
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| CN 201010294775 CN101968391A (en) | 2010-09-28 | 2010-09-28 | Aplanatic fiber Bragg grating pressure sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104457583A (en) * | 2014-11-24 | 2015-03-25 | 上海光亮光电科技有限公司 | Optical fiber length measuring device and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040113104A1 (en) * | 2002-12-12 | 2004-06-17 | Maida John L | Remotely deployed optical fiber circulator |
| CN1760641A (en) * | 2005-11-02 | 2006-04-19 | 浙江大学 | Method and device for multiplexing and demodulating sensor based on optical fiber grating in long cycle |
| WO2006094353A1 (en) * | 2005-03-10 | 2006-09-14 | Commonwealth Scientific And Industrial Research Organisation | An apparatus for pressure sensing |
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- 2010-09-28 CN CN 201010294775 patent/CN101968391A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040113104A1 (en) * | 2002-12-12 | 2004-06-17 | Maida John L | Remotely deployed optical fiber circulator |
| WO2006094353A1 (en) * | 2005-03-10 | 2006-09-14 | Commonwealth Scientific And Industrial Research Organisation | An apparatus for pressure sensing |
| CN1760641A (en) * | 2005-11-02 | 2006-04-19 | 浙江大学 | Method and device for multiplexing and demodulating sensor based on optical fiber grating in long cycle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104457583A (en) * | 2014-11-24 | 2015-03-25 | 上海光亮光电科技有限公司 | Optical fiber length measuring device and method |
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Application publication date: 20110209 |