CN112229909A - All-optical integrated broadband ultrasonic detection device and preparation method thereof - Google Patents
All-optical integrated broadband ultrasonic detection device and preparation method thereof Download PDFInfo
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- CN112229909A CN112229909A CN202011084948.1A CN202011084948A CN112229909A CN 112229909 A CN112229909 A CN 112229909A CN 202011084948 A CN202011084948 A CN 202011084948A CN 112229909 A CN112229909 A CN 112229909A
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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
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
- G01N29/046—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks using the echo of particles imparting on a surface; using acoustic emission of particles
Abstract
The all-optical integrated broadband ultrasonic detection device comprises an L-shaped shell, wherein the L-shaped shell comprises a vertical section and a horizontal section, a first through hole is formed in the vertical section along the vertical direction, and a second through hole is formed in the horizontal section along the vertical direction: a circular resonant cavity is arranged at the bottom of the second through hole, the circular resonant cavity is coaxial with the second through hole, the lower end of the circular resonant cavity is flush with the lower end of the horizontal section, and a circular second copper foil is bonded at the lower end of the circular resonant cavity; the high-power optical fiber is vertically arranged in the first through hole, and a circular first copper foil is bonded at the lower end of the first through hole; and an optical fiber ceramic ferrule jumper is vertically arranged in the second through hole. The optical fiber is used for transmitting nanosecond pulse laser and irradiating copper foil, an ultrasonic source is provided for ultrasonic detection of a rock physical model, an optical interference structure is constructed by using the copper foil and the end face of the optical fiber, and ultrasonic echoes are collected; the two are combined stably through an optimally designed L-shaped integrated structure, and the device has the characteristics of flexibility and portability.
Description
Technical Field
The invention belongs to the technical field of rock physical model ultrasonic detection, and relates to a full-optical integrated broadband ultrasonic detection device and a preparation method thereof.
Background
China is developing and transforming to high quality in the key fields of energy resource development, basic engineering construction and the like, and particularly, the accurate analysis and scientific research and judgment on key geophysical information are urgent. The research on the physical and mechanical properties of rock mass belongs to the research frontier and hotspot in the fields of oil-gas exploration, micro-seismic monitoring, rock mass engineering and the like. The rock physical model is one of the main methods for rock physical research, and the actual rock mass structure is simulated through the artificially prepared rock-like model so as to avoid the defects of long time consumption, high cost, poor operability and the like in field in-situ detection, and the rock physical model has the obvious advantages of high precision, short period, low cost and the like.
At present, the research on the physical and mechanical characteristics of rock mass is mainly based on an ultrasonic nondestructive detection technology, wherein a common capacitive or piezoelectric ultrasonic transducer is used for ultrasonic excitation and receiving. In the aspect of fine research on the characteristics of a complex rock physical model, the ultrasonic transducer generally has the essential defects of single receiving/transmitting (multiple transducers work independently), narrow excitation and receiving frequency bands (mostly single-frequency devices), limited use space (the volume is reduced and the responsivity is reduced), small dynamic range (less than 100dB), insufficient stability and reliability (easy to be interfered by electromagnetism, magnetic fields and the like).
Rock mass ultrasonic testing technique based on laser ultrasonic excitation and optic fibre supersound are received compares in the electric ultrasonic testing mode, and the technical advantage is obvious: nanosecond laser irradiates the photoacoustic functional material to realize multi-mode, high-intensity and broadband ultrasonic high-efficiency excitation; the optical fiber sensing structure receives the rock mass reflection echo, and realizes high sensitivity, high spatial resolution and broadband ultrasonic acquisition. The integration of broadband ultrasonic excitation/reception can be used for accurately and stably detecting the physical and mechanical characteristics of the complex rock physical model.
Disclosure of Invention
The invention aims to provide an all-optical integrated broadband ultrasonic detection device for the acoustic research of rock physical mechanics, so as to overcome various defects of the capacitive or piezoelectric type and other electric ultrasonic transducer.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
full gloss integral type wide band ultrasonic testing device, including L type casing, L type casing includes vertical section and horizontal segment, has seted up first through-hole along vertical direction on the vertical section, and the second through-hole has been seted up along vertical direction to the horizontal segment: a circular resonant cavity is arranged at the bottom of the second through hole, the circular resonant cavity is coaxial with the second through hole, the lower end of the circular resonant cavity is flush with the lower end of the horizontal section, and a circular second copper foil is bonded at the lower end of the circular resonant cavity;
the high-power optical fiber is vertically arranged in the first through hole, and a circular first copper foil is bonded at the lower end of the first through hole;
and an optical fiber ceramic ferrule jumper is vertically arranged in the second through hole.
The invention is further improved in that the L-shaped shell is made of engineering plastics or photosensitive resin.
The invention has the further improvement that the diameter of the first through hole is 10mm, and the length of the first through hole is 25-35 mm; the diameter of the second through hole is 2.6mm, and the length of the second through hole is 3-8 mm.
The invention is further improved in that the diameter of the circular resonant cavity is 10mm, and the thickness of the circular resonant cavity is 0.4-1 mm.
The invention has the further improvement that the diameter of the fiber core of the high-power optical fiber is 200-900 mu m.
The invention has the further improvement that the distance between the tail fiber end face of the high-power optical fiber and the upper surface of the first copper foil is set to be 10-20 mm; the first copper foil is 0.1-0.5 mm in thickness and 11-12 mm in diameter; the first through hole is coaxial with the circular first copper foil.
The invention is further improved in that the thickness of the second copper foil is 0.05-0.5 mm, the diameter of the second copper foil is 11-12 mm, and the circular resonant cavity is coaxial with the circular second copper foil.
The invention is further improved in that the optical fiber ceramic ferrule jumper comprises a sensing optical fiber and a ceramic ferrule, wherein the ceramic ferrule is wrapped on the sensing optical fiber, the outer diameter of the ceramic ferrule is 2.5mm, and the length of the ceramic ferrule is 10 mm.
The invention is further improved in that the distance between the tail fiber end face of the optical fiber ceramic ferrule jumper and the upper surface of the second copper foil is 200-300 mu m.
The preparation method of the all-optical integrated broadband ultrasonic detection device comprises the following steps:
s1, adopt 3D printing technique preparation L type casing, L type casing includes vertical section and horizontal segment, has seted up first through-hole along vertical direction at vertical section, has seted up the second through-hole along vertical direction at the horizontal segment: a circular resonant cavity is arranged at the bottom of the second through hole, the circular resonant cavity is coaxial with the second through hole, and the lower end of the circular resonant cavity is flush with the lower end of the horizontal section;
s2, vertically penetrating the high-power optical fiber from the upper end of the first through hole, and bonding a coaxial circular first copper foil at the lower end of the first through hole;
and S3, vertically penetrating the optical fiber ceramic ferrule jumper wire from the upper end of the second through hole, and bonding a coaxial circular second copper foil at the lower end of the circular resonant cavity.
Compared with the prior art, the invention has the beneficial effects that:
the device belongs to an integrated structure combining high-quality ultrasonic excitation and high-performance optical fiber receiving. In the aspect of high-quality ultrasonic excitation, high-power optical fibers are used for transmitting nanosecond pulse laser with specific wavelength, and then copper foil is irradiated, so that a multi-mode, high-strength and broadband ultrasonic source can be provided for ultrasonic detection of a rock physical model; in the aspect of high-performance optical fiber receiving, a compact and small optical interference structure is constructed by utilizing the ultrathin copper foil and the optical fiber flattened end face, and the ultrasonic echo signals of the rock physical model can be acquired with high sensitivity, high spatial resolution and wide frequency band; the two are combined stably through an optimally designed L-shaped integrated structure, have the characteristics of flexibility and portability, and provide a high-precision and high-reliability ultrasonic transceiver for a rock physical model.
Furthermore, the diameter of the fiber core of the high-power optical fiber is 200-900 microns, the distance between the tail fiber end face of the optical fiber ceramic ferrule jumper and the upper surface of the second copper foil is 200-300 microns, the outer diameter of the ceramic ferrule is 2.5mm, and the length of the ceramic ferrule is 10 mm. If the size design range of the invention is exceeded, clear and distinguishable ultrasonic echo signals of the rock physical model cannot be obtained.
The ultrasonic inspection device prepared by the invention overcomes the problems of single receiving/transmitting (multiple transducers work independently), narrow exciting and receiving frequency bands (mostly single-frequency devices), limited use space (the volume is reduced and the responsivity is reduced), small dynamic range (less than 100dB), insufficient stability and reliability (easy to be interfered by electromagnetism, magnetic fields and the like) and the like in the prior art.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
FIG. 2 is a diagram of a test system for testing the present invention.
Fig. 3 is a graph of an ultrasonic signal curve of a full-optical integrated broadband ultrasonic detection device tested by using a test system.
In the figure, 1 is a sensing fiber, 2 is a high-power fiber, 3 is an L-shaped shell, 4 is a first through hole, 5 is a first copper foil, 6 is a second copper foil, 7 is a circular resonant cavity, 8 is a second through hole, and 9 is a ferrule.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the all-optical integrated broadband ultrasonic detection device of the present embodiment is formed by connecting a sensing fiber 1, a high-power fiber 2, an L-shaped housing 3, a first through hole 4, a first copper foil 5, a second copper foil 6, a circular resonant cavity 7, a second through hole 8, and a ceramic ferrule 9. Wherein, L type casing includes vertical section and horizontal segment, has seted up first through-hole 4 along vertical direction on the vertical section, and second through-hole 8 has been seted up along vertical direction to the horizontal segment: a circular resonant cavity 7 is arranged at the bottom of the second through hole 8, the circular resonant cavity 7 is coaxial with the second through hole 8, the lower end of the circular resonant cavity 7 is flush with the lower end of the horizontal section, and a circular second copper foil 6 is bonded at the lower end of the circular resonant cavity 7;
the high-power optical fiber 2 is vertically arranged in the first through hole 4, and a circular first copper foil 5 is bonded at the lower end of the first through hole 4;
and an optical fiber ceramic ferrule jumper wire is vertically arranged in the second through hole 8.
The preparation method of the all-optical integrated broadband ultrasonic detection device comprises the following steps:
s1, manufacturing the L-shaped shell 3 by adopting a high-precision 3D printing technology, wherein the material of the L-shaped shell 3 is engineering plastics (ABS, PC and nylon) or photosensitive resin (epoxy resin and resin somos11122 and 19120). L type casing includes vertical section and horizontal segment, has seted up first through-hole 4 along vertical direction in vertical section, has seted up second through-hole 8 along vertical direction in the horizontal segment: the diameter of the first through hole 4 is 10mm, the length of the first through hole is 25-35 mm, and the first through hole is used for assembling the broadband ultrasonic excitation end; the diameter of the second through hole 8 is 2.6mm, the length is 3-8 mm, and the second through hole is used for assembling the broadband ultrasonic receiving end. In order to improve the response sensitivity of the broadband ultrasonic receiving end, a circular resonant cavity 7 with the diameter of 10mm and the thickness of 0.4-1 mm is arranged at the bottom of the second through hole 8, the circular resonant cavity 7 is coaxial with the second through hole 8, and the lower end of the circular resonant cavity 7 is flush with the lower end of the horizontal section.
S2, selecting the high-power optical fiber 2 as a laser transmission optical fiber of the nanosecond pulse laser, wherein the diameter of a fiber core of the high-power optical fiber 2 is 200-900 microns, and vertically penetrating the high-power optical fiber 2 from the upper end of the first through hole 4. The lower end of the first through hole 4 is bonded with a coaxial circular first copper foil 5 by using epoxy resin glue, the thickness of the first copper foil 5 is 0.1-0.5 mm, and the diameter is 11-12 mm. The distance between the tail fiber end face of the high-power optical fiber 2 and the upper surface of the first copper foil 5 is set to be 10-20 mm, and the adjustment is carried out according to the waveform characteristics of ultrasonic waves excited after the first copper foil 5 is irradiated by nanosecond pulse laser.
S3, selecting a single-mode fiber or a multi-mode fiber as the sensing fiber 1, wherein the outer diameter of the ceramic ferrule 9 is 2.5mm, the length of the ceramic ferrule 9 is 10mm, connecting the sensing fiber 1 and the ceramic ferrule 9 to form a fiber ceramic ferrule jumper, and vertically penetrating the fiber ceramic ferrule jumper from the upper end of the second through hole 8. And a coaxial circular second copper foil 6 is bonded at the lower end of the circular resonant cavity 7 by using epoxy resin glue, the thickness of the second copper foil 6 is 0.05-0.5 mm, and the diameter is 11-12 mm. The distance between the tail fiber end face of the optical fiber ceramic ferrule jumper and the upper surface of the second copper foil 6 is set to be 200-300 mu m, and the distance is adjusted according to the interference characteristics of an optical interference structure formed by the sensing optical fiber 1 and the second copper foil 6.
At a broadband ultrasonic excitation end, nanosecond pulse laser is transmitted by using the high-power optical fiber 2, is emitted from the tail fiber end face of the high-power optical fiber 2 and irradiates the first copper foil 5. When nanosecond pulse laser is incident on the surface of the first copper foil 5, a part of laser energy is reflected or scattered by the first copper foil 5, a part is absorbed by the first copper foil 5, and the other part is transmitted. Since the density of free electrons in the first copper foil 5 is high, the absorption coefficient of the first copper foil 5 to laser is high, and the corresponding penetration depth is small. Most of the laser energy absorbed by the first copper foil 5 is converted into heat energy, which is diffused in the first copper foil 5 by heat conduction to form a transient non-uniform temperature field. The gradient distribution of temperature causes stress and strain, thereby exciting broadband ultrasonic waves in the first copper foil 5. If the laser energy exceeds a certain value, phenomena such as melting, vaporization and plasma are caused on the surface of the first copper foil 5, and the surface erosion and sputtering generates a recoil force on the surface of the first copper foil 5, thereby exciting a broadband ultrasonic wave. Therefore, the required broadband ultrasonic wave can be excited by adjusting the nanosecond pulse laser energy and the distance between the tail end face of the high-power optical fiber 2 and the upper surface of the first copper foil 5.
And at a broadband ultrasonic receiving end, acquiring ultrasonic echo signals reflected on the surface and the inside of the rock physical model by using an optical interference structure formed by the sensing optical fiber 1 and the second copper foil 6. The sensing laser is transmitted in the sensing optical fiber 1, one part of the sensing laser is reflected back to the sensing optical fiber 1 by the tail fiber end face of the optical fiber ceramic ferrule jumper, and the other part of the sensing laser is emitted out from the tail fiber end face of the optical fiber ceramic ferrule jumper. The emergent light is reflected by the upper surface of the second copper foil 6, then is coupled back to the sensing optical fiber 1 again, and interferes with the reflected light of the tail fiber end face of the optical fiber ceramic ferrule jumper. When the ultrasonic echo signal acts on the second copper foil 6, the second copper foil 6 is deformed, so that the length of an interference cavity between the tail fiber end face of the optical fiber ceramic ferrule jumper and the upper surface of the second copper foil 6 is changed, and the interference information of the optical interference structure is changed accordingly. Therefore, the ultrasonic echo signals can be acquired by detecting the change of the interference information. The circular resonant cavity 7 is arranged, so that the effective deformation range of the second copper foil 6 under the action of the ultrasonic echo signal can be enlarged, and the response sensitivity of the broadband ultrasonic receiving end is improved.
The following are specific examples.
Example 1
S1, manufacturing the L-shaped shell 3 by adopting a high-precision 3D printing technology, wherein the L-shaped shell 3 is made of ABS plastic. A first through hole 4 and a second through hole 8 are respectively provided in the L-shaped housing 3 in the vertical direction: the diameter of the first through hole 4 is 10mm, the length of the first through hole is 25mm, and the first through hole is used for assembling the broadband ultrasonic excitation end; the diameter of the second through hole 8 is 2.6mm, the length is 3mm, and the second through hole is used for assembling the broadband ultrasonic receiving end. In order to improve the response sensitivity of the broadband ultrasonic receiving end, a circular resonant cavity 7 with the diameter of 10mm and the thickness of 0.4mm is arranged, the circular resonant cavity 7 is coaxial with the second through hole 8, and the lower end of the circular resonant cavity 7 is flush with the lower end of the L-shaped shell 3.
S2, selecting the high-power optical fiber 2 as a laser transmission optical fiber of the nanosecond pulse laser, wherein the diameter of a fiber core of the high-power optical fiber 2 is 200-900 microns, and vertically penetrating the high-power optical fiber 2 from the upper end of the first through hole 4. The lower end of the first through hole 4 is bonded with a coaxial circular first copper foil 5 by using epoxy resin glue, the thickness of the first copper foil 5 is 0.1-0.5 mm, and the diameter is 11-12 mm. The distance between the tail fiber end face of the high-power optical fiber 2 and the upper surface of the first copper foil 5 is set to be 10-20 mm, and the adjustment is carried out according to the waveform characteristics of ultrasonic waves excited after the first copper foil 5 is irradiated by nanosecond pulse laser.
S3, selecting a single-mode fiber or a multi-mode fiber as the sensing fiber 1, wherein the outer diameter of the ceramic ferrule 9 is 2.5mm, the length of the ceramic ferrule 9 is 10mm, connecting the sensing fiber 1 and the ceramic ferrule 9 to form a fiber ceramic ferrule jumper, and vertically penetrating the fiber ceramic ferrule jumper from the upper end of the second through hole 8. And a coaxial circular second copper foil 6 is bonded at the lower end of the circular resonant cavity 7 by using epoxy resin glue, the thickness of the second copper foil 6 is 0.05-0.5 mm, and the diameter is 11-12 mm. The distance between the tail fiber end face of the optical fiber ceramic ferrule jumper and the upper surface of the second copper foil 6 is set to be 200-300 mu m, and the distance is adjusted according to the interference characteristics of an optical interference structure formed by the sensing optical fiber 1 and the second copper foil 6.
Example 2
S1, manufacturing the L-shaped shell 3 by adopting a high-precision 3D printing technology, wherein the L-shaped shell 3 is made of epoxy resin. A first through hole 4 and a second through hole 8 are respectively provided in the L-shaped housing 3 in the vertical direction: the diameter of the first through hole 4 is 10mm, the length of the first through hole is 35mm, and the first through hole is used for assembling the broadband ultrasonic excitation end; the diameter of the second through hole 8 is 2.6mm, the length is 8mm, and the second through hole is used for assembling the broadband ultrasonic receiving end. In order to improve the response sensitivity of the broadband ultrasonic receiving end, a circular resonant cavity 7 with the diameter of 10mm and the thickness of 1mm is arranged, the circular resonant cavity 7 is coaxial with the second through hole 8, and the lower end of the circular resonant cavity 7 is flush with the lower end of the L-shaped shell 3.
Steps S2 and S3 are the same as in example 1.
Example 3
S1, manufacturing the L-shaped shell 3 by adopting a high-precision 3D printing technology, wherein the L-shaped shell 3 is made of nylon. A first through hole 4 and a second through hole 8 are respectively provided in the L-shaped housing 3 in the vertical direction: the diameter of the first through hole 4 is 10mm, the length of the first through hole is 30mm, and the first through hole is used for assembling the broadband ultrasonic excitation end; the diameter of the second through hole 8 is 2.6mm, the length is 6mm, and the second through hole is used for assembling the broadband ultrasonic receiving end. In order to improve the response sensitivity of the broadband ultrasonic receiving end, a circular resonant cavity 7 with the diameter of 10mm and the thickness of 0.7mm is arranged, the circular resonant cavity 7 is coaxial with the second through hole 8, and the lower end of the circular resonant cavity 7 is flush with the lower end of the L-shaped shell 3.
Steps S2 and S3 are the same as in example 1.
Example 4
S1, selecting the high-power optical fiber 2 as a laser transmission optical fiber of the nanosecond pulse laser, wherein the diameter of a fiber core of the high-power optical fiber 2 is 200 mu m, and vertically penetrating the high-power optical fiber 2 from the upper end of the first through hole 4. A coaxial circular first copper foil 5 is bonded at the lower end of the first through hole 4 by using epoxy resin glue, the thickness of the first copper foil 5 is 0.1mm, and the diameter is 11 mm. The distance between the end face of the pigtail of the high-power optical fiber 2 and the upper surface of the first copper foil 5 was set to 10 mm.
Steps S2 and S3 are the same as in example 1.
Example 5
S1, selecting the high-power optical fiber 2 as a laser transmission optical fiber of the nanosecond pulse laser, wherein the diameter of a fiber core of the high-power optical fiber 2 is 900 microns, and vertically penetrating the high-power optical fiber 2 from the upper end of the first through hole 4. A coaxial circular first copper foil 5 is bonded at the lower end of the first through hole 4 by using epoxy resin glue, the thickness of the first copper foil 5 is 0.5mm, and the diameter is 12 mm. The distance between the end face of the pigtail of the high-power optical fiber 2 and the upper surface of the first copper foil 5 was set to 20 mm.
Steps S2 and S3 are the same as in example 1.
Example 6
S1, selecting the high-power optical fiber 2 as a laser transmission optical fiber of the nanosecond pulse laser, wherein the diameter of a fiber core of the high-power optical fiber 2 is 600 microns, and vertically penetrating the high-power optical fiber 2 from the upper end of the first through hole 4. A coaxial circular first copper foil 5 is bonded at the lower end of the first through hole 4 by using epoxy resin glue, the thickness of the first copper foil 5 is 0.3mm, and the diameter is 12 mm. The distance between the end face of the pigtail of the high-power optical fiber 2 and the upper surface of the first copper foil 5 was set to 15 mm.
Steps S2 and S3 are the same as in example 1.
Example 7
S1, selecting a single-mode optical fiber as the sensing optical fiber 1, wherein the outer diameter of the ceramic ferrule 9 is 2.5mm, the length of the ceramic ferrule is 10mm, connecting the sensing optical fiber 1 and the ceramic ferrule 9 to form an optical fiber ceramic ferrule jumper, and vertically penetrating the optical fiber ceramic ferrule jumper from the upper end of the second through hole 8. And a coaxial circular second copper foil 6 is bonded at the lower end of the circular resonant cavity 7 by using epoxy resin glue, wherein the thickness of the second copper foil 6 is 0.05mm, and the diameter of the second copper foil is 11 mm. The distance between the tail fiber end face of the optical fiber ceramic ferrule jumper and the upper surface of the second copper foil 6 is set to be 200 mu m.
Steps S2 and S3 are the same as in example 1.
Example 8
S1, selecting a multimode optical fiber as the sensing optical fiber 1, wherein the outer diameter of the ceramic ferrule 9 is 2.5mm, the length of the ceramic ferrule is 10mm, connecting the sensing optical fiber 1 and the ceramic ferrule 9 to form an optical fiber ceramic ferrule jumper, and vertically penetrating the optical fiber ceramic ferrule jumper from the upper end of the second through hole 8. A coaxial circular second copper foil 6 is bonded at the lower end of the circular resonant cavity 7 by using epoxy resin glue, the thickness of the second copper foil 6 is 0.5mm, and the diameter is 12 mm. The distance between the tail fiber end face of the optical fiber ceramic ferrule jumper and the upper surface of the second copper foil 6 is set to be 300 mu m.
Steps S2 and S3 are the same as in example 1.
Example 9
S1, selecting a multimode optical fiber as the sensing optical fiber 1, wherein the outer diameter of the ceramic ferrule 9 is 2.5mm, the length of the ceramic ferrule is 10mm, connecting the sensing optical fiber 1 and the ceramic ferrule 9 to form an optical fiber ceramic ferrule jumper, and vertically penetrating the optical fiber ceramic ferrule jumper from the upper end of the second through hole 8. A coaxial circular second copper foil 6 is bonded at the lower end of the circular resonant cavity 7 by using epoxy resin glue, the thickness of the second copper foil 6 is 0.3mm, and the diameter is 12 mm. The distance between the tail fiber end face of the optical fiber ceramic ferrule jumper and the upper surface of the second copper foil 6 is set to be 250 micrometers.
Steps S2 and S3 are the same as in example 1.
In order to verify the beneficial effects of the invention, the inventor uses the all-optical integrated broadband ultrasonic detection device prepared in embodiment 1 of the invention to perform experimental tests:
as shown in fig. 2, a nanosecond pulse laser is used as a broadband ultrasonic excitation light source, the space laser emitted from the nanosecond pulse laser is guided into the high-power optical fiber 2 through the optical fiber coupler, and then emitted from the end face of the pigtail of the high-power optical fiber 2 and irradiated on the first copper foil 5, so as to excite broadband ultrasonic waves. A tunable laser is used as a broadband ultrasonic receiving light source, sensing laser emitted from the tunable laser is guided into a sensing optical fiber 1 through an optical fiber circulator, the sensing optical fiber 1 and a second copper foil 6 form an optical interference structure, interference information of the optical interference structure is modulated by an ultrasonic echo signal and then guided into a photoelectric detector through the optical fiber circulator, the optical signal is converted into an electric signal, and finally the electric signal is collected by an oscilloscope. Water is filled in the water tank, the water is used as an ultrasonic coupling agent, a rock physical model with the thickness of 20mm is placed at the bottom of the water tank, the first copper foil 5 and the second copper foil 6 of the all-optical integrated broadband ultrasonic detection device are immersed in the water, and the distance between the upper surface of the rock physical model and the lower end of the L-shaped shell 3 is 40 mm. After the ultrasonic waves emitted from the broadband ultrasonic excitation end are transmitted to the petrophysical model through water, one part of the ultrasonic waves is reflected by the upper surface of the petrophysical model, and the other part of the ultrasonic waves is continuously transmitted to the lower surface of the petrophysical model and is reflected. The ultrasonic echo signals are transmitted to the second copper foil 6 through water, so that the second copper foil is deformed, interference information of the optical interference structure is further modulated, the ultrasonic echo signals reflected by the upper surface and the lower surface of the rock physical model are recorded by an oscilloscope, and an experimental result is shown in fig. 3.
When ultrasonic echo signals reflected by the upper surface and the lower surface of the rock physical model are detected, obvious signal peak values appear at sampling time of 60 mu s and 75 mu s in fig. 3, and according to the propagation speed of ultrasonic waves in water of 1400m/s and the propagation speed of ultrasonic waves in the rock physical model of 2700m/s, based on a transit time method, the ultrasonic echo signal reflected by the upper surface of the rock physical model is corresponding to the signal peak value at 60 mu s, and the ultrasonic echo signal reflected by the lower surface of the rock physical model is corresponding to the signal peak value at 75 mu s. Experimental results show that the invention can realize multilayer ultrasonic detection of the rock physical model, meet the requirements of exciting and receiving broadband ultrasonic waves in real-time dynamic scanning of the rock physical model, stably detect the physical and mechanical characteristics of the complex rock physical model, and has wide application prospects in the fields of oil-gas exploration, microseismic monitoring, rock engineering and the like.
Claims (10)
1. Full gloss integral type wide band ultrasonic testing device, its characterized in that, including L type casing (3), first through-hole (4) have been seted up along vertical direction to L type casing including vertical section and horizontal segment on the vertical section, and second through-hole (8) have been seted up along vertical direction to the horizontal segment: a circular resonant cavity (7) is arranged at the bottom of the second through hole (8), the circular resonant cavity (7) is coaxial with the second through hole (8), the lower end of the circular resonant cavity (7) is flush with the lower end of the horizontal section, and a circular second copper foil (6) is bonded at the lower end of the circular resonant cavity (7);
the high-power optical fiber (2) is vertically arranged in the first through hole (4), and a circular first copper foil (5) is bonded at the lower end of the first through hole (4);
an optical fiber ceramic ferrule jumper wire is vertically arranged in the second through hole (8).
2. The all-optical integrated broadband ultrasonic detection device according to claim 1, wherein the L-shaped shell (3) is made of engineering plastics or photosensitive resin.
3. The all-optical integrated broadband ultrasonic detection device according to claim 1, wherein the first through hole (4) has a diameter of 10mm and a length of 25-35 mm; the diameter of the second through hole (8) is 2.6mm, and the length of the second through hole is 3-8 mm.
4. The all-optical integrated broadband ultrasonic detection device according to claim 1, wherein the circular resonant cavity (7) has a diameter of 10mm and a thickness of 0.4-1 mm.
5. The all-optical integrated broadband ultrasonic detection device according to claim 1, wherein the diameter of the fiber core of the high-power optical fiber (2) is 200-900 μm.
6. The all-optical integrated broadband ultrasonic detection device according to claim 1, wherein the distance between the tail end face of the high-power optical fiber (2) and the upper surface of the first copper foil (5) is set to be 10-20 mm; the thickness of the first copper foil (5) is 0.1-0.5 mm, and the diameter is 11-12 mm; the first through hole (4) is coaxial with the circular first copper foil (5).
7. The all-optical integrated broadband ultrasonic detection device according to claim 1, wherein the second copper foil (6) has a thickness of 0.05-0.5 mm and a diameter of 11-12 mm, and the circular resonant cavity (7) is coaxial with the circular second copper foil (6).
8. The all-optical integrated broadband ultrasonic detection device according to claim 1, wherein the optical fiber ferrule jumper comprises a sensing optical fiber (1) and a ferrule (9), the ferrule (9) is wrapped on the sensing optical fiber (1), and the ferrule (9) has an outer diameter of 2.5mm and a length of 10 mm.
9. The all-optical integrated broadband ultrasonic detection device according to claim 1, wherein the distance between the tail fiber end face of the optical fiber ferrule jumper and the upper surface of the second copper foil (6) is 200-300 μm.
10. The preparation method of the all-optical integrated broadband ultrasonic detection device is characterized by comprising the following steps of:
s1, adopt 3D printing technique preparation L type casing (3), L type casing includes vertical section and horizontal segment, has seted up first through-hole (4) along vertical direction at vertical section, has seted up second through-hole (8) along vertical direction at the horizontal segment: a circular resonant cavity (7) is arranged at the bottom of the second through hole (8), the circular resonant cavity (7) is coaxial with the second through hole (8), and the lower end of the circular resonant cavity (7) is flush with the lower end of the horizontal section;
s2, vertically penetrating the high-power optical fiber (2) from the upper end of the first through hole (4), and bonding a coaxial circular first copper foil (5) at the lower end of the first through hole (4);
and S3, vertically penetrating the optical fiber ceramic ferrule jumper wire from the upper end of the second through hole (8), and bonding a coaxial circular second copper foil (6) at the lower end of the circular resonant cavity (7).
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