CN104267101A - Optical fiber acoustic perspective instrument - Google Patents
Optical fiber acoustic perspective instrument Download PDFInfo
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- CN104267101A CN104267101A CN201410579186.0A CN201410579186A CN104267101A CN 104267101 A CN104267101 A CN 104267101A CN 201410579186 A CN201410579186 A CN 201410579186A CN 104267101 A CN104267101 A CN 104267101A
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Abstract
The invention discloses an optical fiber acoustic perspective instrument, and belongs to the technical field of optical fiber detection. According to the invention, the optical fiber acoustic perspective instrument detects the physical-mechanical properties of ice and other solid substances by using a fiber Bragg grating dynamic acoustic method, and comprises a detection optical fiber (1), a flange (2), a grating demodulation module group (3), a broadband light source (4), an acoustic generator (5), a DC (Direct Current) power supply (6), a host machine (7), an oscilloscope (8), a computer (9) and a main circulator (10). The optical fiber acoustic perspective instrument can dynamically monitor and record the physical-mechanical parameters of ice and other solid substances, is small in size, high in sensitivity, strong in ability to resist external electromagnetic interference and portable, can accurately record the propagation parameters of acoustic waves in ice, and can be directly used for measuring the physical-mechanical parameters of ice in a natural state.
Description
Technical field
The present invention relates to fiber-optic probe technical field, be specifically related to a kind of optical fiber acoustic scenograph utilizing the dynamic sonic method of Fiber Bragg Grating FBG to detect the physical-mechanical properties of the solid matters such as ice.
Background technology
The economic activity of extensive distribution on the mankind of nature ice and frozen soil layer has great impact.The total area of perennial cryolithic zone has accounted for 25% of the land total area.The mechanical characteristic of research ice, determines elastic modulus parameter value and the plastic properties with the contacting of range in stiffness, ice thereof, and sets up and determine that effective scientific investigation instruments and methods of these parameters is all an important scientific practice for the every field of mankind's activity.By record sound wave through the parameter of ice, the physico mechanical characteristic of ice just can be calculated: the dynamic modulus of elasticity; Bulk viscosity; Coefficient of interal friction.Elastic parameter also has physical basis with the relation of rigidity and deformation behavior, adopts at present extensively and to stretch based on magnetic and the various acceleration recorder record acoustic signals of piezoelectric principle.But these sensor profiles are comparatively large, and susceptibility is inadequate, condition needed for cannot ensureing to carry out on the spot testing in marine site and the South Pole.
Summary of the invention
The technical problem to be solved in the present invention is invention and utilizes the dynamic sonic method of Fiber Bragg Grating FBG, adopts the physical-mechanical properties of the solid matters such as the highly sensitive detection of dynamic ice of Fibre Optical Sensor that the bodily form is very little.
To achieve the object of the present invention, the technical solution used in the present invention is, a kind of optical fiber acoustic scenograph detecting the physical-mechanical properties of the solid matters such as ice based on the dynamic sonic method of Fiber Bragg Grating FBG, comprises detection optical fiber 1, flange 2, grating demodulation module group 3, wideband light source (ASE) 4, sonic generator 5, direct supply 6, main frame 7, oscillograph 8, computing machine 9 and main loop device 10; Wherein, flange 2, grating demodulation module group 3, wideband light source (ASE) 4, direct supply 6 and main loop device 10 are positioned at main frame 7; Detection grating 20 containing 2 ~ 8 groups of different centre wavelengths in described detection optical fiber 1, and be connected with main frame 7 by flange 2; Described grating demodulation module group 3 is in series by basic module 11 and 1 ~ 7 group of monochromatic light grid demodulation module 12; Basic module 11 is made up of the first circulator 13, first photodetector 14 and the first demodulation grating 15, No. 1 port of the first circulator 13 is connected with No. 3 ports of main loop device 10, No. 2 ports are connected with the first demodulation grating 15, No. 3 ports are connected with the first photodetector 14, and the other end of the first demodulation grating 15 is connected with first group of monochromatic light grid demodulation module 12; All monochromatic light grid demodulation modules 12 are made up of the second circulator 16, second demodulation grating 18 and the second photodetector 17; No. 1 port of the second circulator 16 in first group of monochromatic light grid demodulation module 12 is connected with the first demodulation grating 15 in basic module 11, No. 2 ports are connected with one end of the second demodulation grating 18, No. 3 ports are connected with the second photodetector 17, and No. 1 port that the other end and next of the second demodulation grating 18 organize the second circulator 16 in monochromatic light grid demodulation module 12 is connected or puts sky; No. 1 port of the second circulator 16 in second group ~ the 8th group monochromatic light grid demodulation module 12 is connected with the second demodulation grating 18 in upper one group of monochromatic light grid demodulation module 12, and the other end of the second demodulation grating 18 in last group monochromatic light grid demodulation module 12 puts sky; Flange 2 is connected with No. 2 ports of main loop device 10, and wideband light source 4 is connected with No. 1 port of main loop device 10, and No. 3 ports of main loop device 10 are connected with basic module 11, after monochromatic light grid demodulation module 12 is connected on basic module 11; The second circulator 16 in main loop device 10, first circulator 13 and all monochromatic light grid demodulation modules 12 allows light to enter from No. 1 port, goes out, or enters from No. 2 ports, go out from No. 3 ports from No. 2 ports; Direct supply 6 is connected with the second photodetector 17 in all monochromatic light grid demodulation modules 12 with the first photodetector 14 by electric wire; First photodetector 14 is connected with oscillograph 8 by wiring with the second photodetector 17 in all monochromatic light grid demodulation modules 12, and the second photodetector 17 in the first photodetector 14 and all monochromatic light grid demodulation modules 12 is in parallel; Computing machine 9 is connected with oscillograph 8 by data line; Sonic generator 5 is positioned on thing to be detected, uses during measurement; The limiting voltage that described Direct Current 6 supplies photodetector and wideband light source (ASE) 4 is 5V; The centre wavelength one_to_one corresponding of the first demodulation grating 15 and the centre wavelength of the second demodulation grating 18 in all monochromatic light grid demodulation modules 12 and the detection grating 20 in detection optical fiber 1 and wavelength size is identical.
Each demodulation grating detected in grating 20 and grating demodulation module group 3 cooperatively interacts, and both quantity is consistent with centre wavelength.When the detection grating 20 containing 2 groups of different centre wavelengths in described detection optical fiber 1, containing 1 group of basic module 11 and 1 group of monochromatic light grid demodulation module 12 in corresponding grating demodulation module group 3, now instrument application is in measuring the parameter on one dimension straight line; When the detection grating 20 containing 4 groups of different centre wavelengths in described detection optical fiber 1, containing 1 group of basic module 11 and 3 groups of monochromatic light grid demodulation modules 12 in corresponding grating demodulation module group 3, every two groups of detection gratings 20 measure a dimension as a unit, and now instrument application is in measuring the parameter on two dimensional surface; When the detection grating 20 containing 8 groups of different centre wavelengths in described detection optical fiber 1, containing 1 group of basic module 11 and 7 groups of monochromatic light grid demodulation modules 12 in corresponding grating demodulation module group 3, every two groups of detection gratings 20 measure a dimension as a unit, wherein 2 groups of detection gratings 20 put sky, for contrast and raising precision, now instrument application is in the parameter measuring 3 D stereo.The structure of circulator and detection grating is prior art.
The present invention establishes the system and method for the physical-mechanical properties of the solid matters such as a set of modern Fiber Bragg Grating FBG dynamic sonic method detection of dynamic ice, dynamic monitoring and record elastic sound waves characteristic, except the mechanical characteristic for determining ice and serial physical parameter, also derby can be surveyed, this kind of parameter of the solid matters such as rock.The sensor profile that instrument adopts is little, and susceptibility is high, accurately can record the propagation parameter of sound wave in ice; The grating of sensor can be placed in ultralow temperature ice sample, directly can record acoustic wave parameter when applying pressure to ice sample; The recording density of optical fiber acoustic scenograph is high, can measure small size ice sample; Device is compact, can measure with on its direct ice sample in its natural state; Object of research establishes an optical fiber acoustic scenograph automatic network, so that test record.
In this instrument, we adopt bragg fiber sensor (FBG) to record various mechanics parameter.Wherein, the parameter of sound wave through ice sample can be recorded by FBG system, there is accurate record, can be placed in ultralow temperature ice sample, on small size ice sample, and direct ice sample in its natural state carry out the advantage such as measuring.
Accompanying drawing explanation
Fig. 1 host structure chart of the present invention.
The structural representation of grating demodulation module group 3 in Fig. 2 the present invention.
The structural representation of basic module 11 in Fig. 3 the present invention.
The structural representation of monochromatic light grid demodulation module 12 in Fig. 4 the present invention.
Fig. 5 the present invention measures the acoustics of ice and the schematic diagram of physics-mechanics characteristic curve.
Fig. 6 the present invention measures the schematic diagram of mechanical characteristic of ice of layering, anisotropic structure.
The structural representation of Fig. 7 the first demodulation grating 15, second demodulation grating 18 of the present invention.
The Reference numeral of contained equipment and instrument in each figure:
1 is detection optical fiber; 2 is flange; 3 is grating demodulation module group; 4 is wideband light source (ASE); 5 is sonic generator; 6 is direct supply; 7 is main frame; 8 is oscillograph; 9 is computing machine; 10 is main loop device; 11 is basic module; 12 is monochromatic light grid demodulation modules; 13 is the first circulator; 14 is the first photodetector; 15 is the first demodulation grating; 16 is the second circulator; 17 is the second photodetector; 18 is the second demodulation grating; 19 is sound wave (ultrasound wave) pulse; 20 is detection grating; 21 is ice sample to be measured; 22 is spiral micrometer bar; 23 is metal support; 24 is carbon fibre slice; 25 is the optical fiber containing demodulation grating.
Embodiment
With embodiment, the present invention is described below, but is not limited thereto.
Embodiment 1
As shown in accompanying drawing 1 ~ 4, a kind of optical fiber acoustic scenograph detecting the physical-mechanical properties of ice based on the dynamic sonic method of Fiber Bragg Grating FBG, comprise detection optical fiber 1, flange 2, grating demodulation module group 3, wideband light source (ASE) 4, sonic generator 5, direct supply 6, main frame 7, oscillograph 8, computing machine 9 and main loop device 10; Wherein, flange 2, grating demodulation module group 3, wideband light source (ASE) 4, direct supply 6 and main loop device 10 are positioned at main frame 7; Detection grating 20 containing 2 groups of different centre wavelengths in described detection optical fiber 1, and be connected with main frame 7 by flange 2; Described grating demodulation module group 3 is in series by basic module 11 and 1 group of monochromatic light grid demodulation module 12; Basic module 11 is made up of the first circulator 13, first photodetector 14 and the first demodulation grating 15, No. 1 port of the first circulator 13 is connected with main loop device 10, No. 2 ports are connected with the first demodulation grating 15, No. 3 ports are connected with the first photodetector 14, and the other end of the first demodulation grating 15 is connected with monochromatic light grid demodulation module 12; Monochromatic light grid demodulation module 12 is made up of the second circulator 16, second demodulation grating 18 and the second photodetector 17; No. 1 port of the second circulator 16 is connected with the first demodulation grating 15 in basic module 11, and No. 2 ports are connected with one end of the second demodulation grating 18, and No. 3 ports are connected with the second photodetector 17, and the other end of the second demodulation grating 18 puts sky; Flange 2 is connected with No. 2 ports of main loop device 10, and wideband light source 4 is connected with No. 1 port of main loop device 10, and No. 3 ports of main loop device 10 are connected with basic module 11, after monochromatic light grid demodulation module 12 is connected on basic module 11; The second circulator 16 in main loop device 10, first circulator 13 and monochromatic light grid demodulation module 12 allows light to enter from No. 1 port, goes out, or enters from No. 2 ports, go out from No. 3 ports from No. 2 ports; Direct supply 6 is connected with the second photodetector 17 in monochromatic light grid demodulation module 12 with the first photodetector 14 by electric wire; First photodetector 14 is connected with oscillograph 8 by wiring with the second photodetector 17 in monochromatic light grid demodulation module 12, and the second photodetector 17 in the first photodetector 14 and monochromatic light grid demodulation module 12 is in parallel; Computing machine 9 is connected with oscillograph 8 by data line; Sonic generator 5 is positioned on thing to be detected, uses during measurement; The limiting voltage that described Direct Current 6 supplies photodetector and wideband light source (ASE) 4 is 5V; The centre wavelength of the first demodulation grating 15 and the second demodulation grating 18 detects the centre wavelength one_to_one corresponding of grating 20 with 2 in detection optical fiber 1 group and wavelength size is identical.
Embodiment 2
A kind of optical fiber acoustic scenograph detecting the physical-mechanical properties of ice based on the dynamic sonic method of Fiber Bragg Grating FBG, comprise detection optical fiber 1, flange 2, grating demodulation module group 3, wideband light source (ASE) 4, sonic generator 5, direct supply 6, main frame 7, oscillograph 8, computing machine 9 and main loop device 10; Wherein, flange 2, grating demodulation module group 3, wideband light source (ASE) 4, direct supply 6 and main loop device 10 are positioned at main frame 7; Detection grating 20 containing 4 groups of different centre wavelengths in described detection optical fiber 1, and be connected with main frame 7 by flange 2; Described grating demodulation module group 3 is in series by basic module 11 and 3 groups of monochromatic light grid demodulation modules 12; Basic module 11 is by the first circulator 13, first photodetector 14 and the first demodulation grating 15 form, No. 1 port of the first circulator 13 is connected with main loop device 10, No. 2 ports are connected with the first demodulation grating 15, No. 3 ports are connected with the first photodetector 14, and the other end of the first demodulation grating 15 is connected with first group of monochromatic light grid demodulation module 12; All monochromatic light grid demodulation modules 12 are made up of the second circulator 16, second demodulation grating 18 and the second photodetector 17; In first group of monochromatic light grid demodulation module 12, No. 1 port of the second circulator 16 is connected with the first demodulation grating 15 in basic module 11, No. 2 ports are connected with one end of the second demodulation grating 18, No. 3 ports are connected with the second photodetector 17, and the other end of the second demodulation grating 18 is connected with No. 1 port of the second circulator 16 in second group of monochromatic light grid demodulation module 12; No. 1 port of the second circulator 16 in second group of monochromatic light grid demodulation module 12 is connected with the second demodulation grating 18 in first group of monochromatic light grid demodulation module 12, the other end of the second demodulation grating 18 in second group of monochromatic light grid demodulation module 12 is connected with No. 1 port of the second circulator 16 in the 3rd group of monochromatic light grid demodulation module 12, and the other end of the second demodulation grating 18 in the 3rd group of monochromatic light grid demodulation module 12 puts sky; Flange 2 is connected with No. 2 ports of main loop device 10, and wideband light source 4 is connected with No. 1 port of main loop device 10, and No. 3 ports of main loop device 10 are connected with basic module 11, after monochromatic light grid demodulation module 12 is connected on basic module 11; The second circulator 16 in main loop device 10, first circulator 13 and all monochromatic light grid demodulation modules 12 allows light to enter from No. 1 port, goes out, or enters from No. 2 ports, go out from No. 3 ports from No. 2 ports; Direct supply 6 is connected with the second photodetector 17 in all monochromatic light grid demodulation modules 12 with the first photodetector 14 by electric wire; First photodetector 14 is connected with oscillograph 8 by wiring with the second photodetector 17 in all monochromatic light grid demodulation modules 12, and the second photodetector 17 in the first photodetector 14 and all monochromatic light grid demodulation modules 12 is in parallel; Computing machine 9 is connected with oscillograph 8 by data line; Sonic generator 5 is positioned on thing to be detected, uses during measurement; The limiting voltage that described Direct Current 6 supplies photodetector and wideband light source (ASE) 4 is 5V; The centre wavelength of the first demodulation grating 15 and the second demodulation grating 18 in three groups of monochromatic light grid demodulation modules 12 detects the centre wavelength one_to_one corresponding of grating 20 with 4 in detection optical fiber 1 group and wavelength size is identical.
Embodiment 3
A kind of optical fiber acoustic scenograph detecting the physical-mechanical properties of ice based on the dynamic sonic method of Fiber Bragg Grating FBG, comprise detection optical fiber 1, flange 2, grating demodulation module group 3, wideband light source (ASE) 4, sonic generator 5, direct supply 6, main frame 7, oscillograph 8, computing machine 9 and main loop device 10; Wherein, flange 2, grating demodulation module group 3, wideband light source (ASE) 4 and direct supply 6 and main loop device 10 are positioned at main frame 7; Detection grating 20 containing 8 groups of different centre wavelengths in described detection optical fiber 1, and be connected with main frame 7 by flange 2; Described grating demodulation module group 3 is in series by basic module 11 and 7 groups of monochromatic light grid demodulation modules 12; Basic module 11 is by the first circulator 13, first photodetector 14 and the first demodulation grating 15 form, No. 1 port of the first circulator 13 is connected with main loop device 10, No. 2 ports are connected with the first demodulation grating 15, No. 3 ports are connected with the first photodetector 14, and the other end of the first demodulation grating 15 is connected with first group of monochromatic light grid demodulation module 12; All monochromatic light grid demodulation modules 12 are made up of the second circulator 16, second demodulation grating 18 and the second photodetector 17; In first group of monochromatic light grid demodulation module 12, No. 1 port of the second circulator 16 is connected with the first demodulation grating 15 in basic module 11, No. 2 ports are connected with one end of the second demodulation grating 18, No. 3 ports are connected with the second photodetector 17, and No. 1 port that the other end and next of the second demodulation grating 18 organize the second circulator 16 in monochromatic light grid demodulation module 12 is connected or puts sky; No. 1 port of the second circulator 16 in second group ~ the 8th group monochromatic light grid demodulation module 12 is connected with the second demodulation grating 18 in upper one group of monochromatic light grid demodulation module 12, and the other end of the second demodulation grating 18 in last group monochromatic light grid demodulation module 12 puts sky; Flange 2 is connected with No. 2 ports of main loop device 10, and wideband light source 4 is connected with No. 1 port of main loop device 10, and No. 3 ports of main loop device 10 are connected with basic module 11, after monochromatic light grid demodulation module 12 is connected on basic module 11; The second circulator 16 in main loop device 10, first circulator 13 and all monochromatic light grid demodulation modules 12 allows light to enter from No. 1 port, goes out, or enters from No. 2 ports, go out from No. 3 ports from No. 2 ports; Direct supply 6 is connected with the second photodetector 17 in all monochromatic light grid demodulation modules 12 with the first photodetector 14 by electric wire; First photodetector 14 is connected with oscillograph 8 by wiring with the second photodetector 17 in all monochromatic light grid demodulation modules 12, and the second photodetector 17 in the first photodetector 14 and all monochromatic light grid demodulation modules 12 is in parallel; Computing machine 9 is connected with oscillograph 8 by data line; Sonic generator 5 is positioned on thing to be detected, uses during measurement; The limiting voltage that described Direct Current 6 supplies photodetector and wideband light source (ASE) 4 is 5V; The centre wavelength of the first demodulation grating 15 and the second demodulation grating 18 in all monochromatic light grid demodulation modules 12 detects the centre wavelength one_to_one corresponding of grating 20 with 8 in detection optical fiber 1 group and wavelength size is identical.
Embodiment 4
As shown in Figure 5: be pasted on ice sample 21 to be measured by linearly for detection optical fiber 1, and the probe of sonic generator 5 is close to the side of ice, open main frame 7 and oscillograph 8, each demodulation grating in basic module 11 and all monochromatic light grid demodulation modules 12 is regulated to make its centre wavelength consistent with the centre wavelength of corresponding detection grating, instruction is sent to pinger 5 afterwards by computing machine 9, it is made to send sound wave pulse 19 to ice sample 21 to be measured, received the signal that comprises ice sample 21 physical mechanics information to be measured by detection optical fiber 1 and passed to main frame 7 and carry out demodulation, signal after demodulation carries out the analog to digital conversion of signal by oscillograph 8, signal after conversion as calculated machine 9 process obtains and shows the one dimension physical mechanics information of ice sample 21 to be measured.
Embodiment 5
As shown in Figure 6: detection optical fiber 1 is pasted on ice sample 21 to be measured in two vertical shaft-like, and the probe of sonic generator 5 is close to the side of ice, open main frame 7 and oscillograph 8, each demodulation grating in basic module 11 and all monochromatic light grid demodulation modules 12 is regulated to make its centre wavelength consistent with the centre wavelength of corresponding detection grating, instruction is sent to pinger 5 afterwards by computing machine 9, it is made to send sound wave pulse 19 to ice sample 21 to be measured, received the signal that comprises ice sample 21 physical mechanics information to be measured by detection optical fiber 1 and passed to main frame 7 and carry out demodulation, signal after demodulation carries out the analog to digital conversion of signal by oscillograph 8, signal after conversion as calculated machine 9 process obtains and shows the two-dimensional physical mechanical information of ice sample 21 to be measured.
Embodiment 6
As shown in Figure 7: spiral micrometer bar 22 and carbon fibre slice 24 are fixed on metal support 23, by epoxide-resin glue, the two ends of demodulation grating part-the first demodulation grating 15 (the second demodulation grating 18) of the optical fiber 25 containing demodulation grating are closely pasted onto the centre of the downward side of carbon fibre slice 24, the centre of carbon fibre slice 24 upwards side faces spiral micrometer bar 22, according to oscillograph 8, figure carrys out the knob of adjustable screw micrometer bar 22, force the first demodulation grating 15 (the second demodulation grating 18) and carbon fibre slice 24 deformation to occur thereupon, thus reach the object that detection grating conciliates light modulation grid coupling.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For the person of ordinary skill of the art, can according to technical scheme of the present invention and inventive concept, make corresponding change and substitute, and performance or purposes identical, all should be considered as protection scope of the present invention.
Claims (4)
1. an optical fiber acoustic scenograph, comprise detection optical fiber (1), flange (2), grating demodulation module group (3), wideband light source (4), sonic generator (5), direct supply (6), main frame (7), oscillograph (8), computing machine (9) and main loop device (10); Wherein, flange (2), grating demodulation module group (3), wideband light source (4) and direct supply (6) are positioned at main frame (7); Detection grating (20) containing 2 ~ 8 groups of different centre wavelengths in described detection optical fiber (1), and be connected with main frame (7) by flange (2); Described grating demodulation module group (3) is in series by basic module (11) and 1 ~ 7 group of monochromatic light grid demodulation module (12); Basic module (11) is made up of the first circulator (13), the first photodetector (14) and the first demodulation grating (15), No. 1 port of the first circulator (13) is connected with main loop device (10), No. 2 ports are connected with the first demodulation grating (15), No. 3 ports are connected with the first photodetector (14), and the other end of the first demodulation grating (15) is connected with first group of monochromatic light grid demodulation module (12); All monochromatic light grid demodulation modules (12) are made up of the second circulator (16), the second demodulation grating (18) and the second photodetector (17); No. 1 port of the second circulator (16) in first group of monochromatic light grid demodulation module (12) is connected with the first demodulation grating (15) in basic module (11), No. 2 ports are connected with one end of the second demodulation grating (18), No. 3 ports are connected with the second photodetector (17), and No. 1 port that the other end and next of the second demodulation grating (18) organize the second circulator (16) in monochromatic light grid demodulation module (12) is connected or puts sky; No. 1 port of the second circulator (16) in other monochromatic light grid demodulation modules (12) except first group is connected with the second demodulation grating (18) in upper one group of monochromatic light grid demodulation module (12), and the other end of the second demodulation grating (18) in last group monochromatic light grid demodulation module (12) puts sky; Flange (2) is connected with No. 2 ports of main loop device (10), wideband light source (4) is connected with No. 1 port of main loop device (10), No. 3 ports of main loop device (10) are connected with basic module (11), after monochromatic light grid demodulation module (12) is connected on basic module (11); Main loop device (10), the second circulator (16) in first circulator (13) and all monochromatic light grid demodulation modules (12) only allows light to enter from No. 1 port, go out from No. 2 ports, or enter from No. 2 ports, go out from No. 3 ports; Direct supply (6) is connected with the second photodetector (17) in all monochromatic light grid demodulation modules (12) with the first photodetector (14) by electric wire; First photodetector (14) is connected with oscillograph (8) by wiring with the second photodetector (17) in all monochromatic light grid demodulation modules (12),, the second photodetector (17) in the first photodetector (14) and all monochromatic light grid demodulation modules (12) is in parallel; Computing machine (9) is connected with oscillograph (8) by data line; Sonic generator (5) is positioned on thing to be detected, uses during measurement; The limiting voltage of described Direct Current (6) supply photodetector and wideband light source (4) is 5V; The centre wavelength one_to_one corresponding of the first demodulation grating (15) and the centre wavelength of the second demodulation grating (18) in all monochromatic light grid demodulation modules (12) and the detection grating (20) in detection optical fiber (1) and wavelength size is identical.
2. an optical fiber acoustic scenograph according to claim 1, it is characterized in that, detection grating (20) containing 2 groups of different centre wavelengths in described detection optical fiber (1), containing 1 group of basic module (11) and 1 group of monochromatic light grid demodulation module (12) in described grating demodulation module group (3).
3. an optical fiber acoustic scenograph according to claim 1, it is characterized in that, detection grating (20) containing 4 groups of different centre wavelengths in described detection optical fiber (1), containing 1 group of basic module (11) and 3 groups of monochromatic light grid demodulation modules (12) in described grating demodulation module group (3).
4. an optical fiber acoustic scenograph according to claim 1, it is characterized in that, detection grating (20) containing 8 groups of different centre wavelengths in described detection optical fiber (1), containing 1 group of basic module (11) and 7 groups of monochromatic light grid demodulation modules (12) in described grating demodulation module group (3).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106368676A (en) * | 2016-09-29 | 2017-02-01 | 吉林大学 | Ice auger acoustic logging instrument provided with fiber bragg gratings |
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| TAKUMA FUJISUE等: "Demodulation of Acoustic Signals in Fiber Bragg Grating Ultrasonic Sensors Using Arrayed Waveguide Gratings", 《JAPANESE JOURNAL OF APPLIED PHYSICS》 * |
| 崔洪亮等: "光纤传感器及其在地质矿产勘探开发中的应用", 《吉林大学学报（地球科学版）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106368676A (en) * | 2016-09-29 | 2017-02-01 | 吉林大学 | Ice auger acoustic logging instrument provided with fiber bragg gratings |
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| CN104267101B (en) | 2016-12-07 |
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