CN110044468A - A kind of optical fiber Fabry-Perot hydrophone system for spherical focusing sound collector acoustic field - Google Patents
A kind of optical fiber Fabry-Perot hydrophone system for spherical focusing sound collector acoustic field Download PDFInfo
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- CN110044468A CN110044468A CN201910407953.2A CN201910407953A CN110044468A CN 110044468 A CN110044468 A CN 110044468A CN 201910407953 A CN201910407953 A CN 201910407953A CN 110044468 A CN110044468 A CN 110044468A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/002—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means for representing acoustic field distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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Abstract
The invention discloses a kind of optical fiber Fabry-Perot hydrophone systems for spherical focusing sound collector acoustic field, including optical fiber Fabry-Perot ultrasonic hydrophone, hydrophone fixture, signal processing system, host computer, three-dimensional mobile platform and platform drive control device, host computer and signal processing system, platform drive control device is connected, platform drive control device is connected with three-dimensional mobile platform, signal processing system is connected with optical fiber Fabry-Perot ultrasonic hydrophone, optical fiber Fabry-Perot ultrasonic hydrophone is clamped on the hydrophone clamp, hydrophone fixture is mounted in three-dimensional mobile platform；Host computer is according to i voltage variety Δ V of feedbackiDetermine the sound-filed simulation of spherical focusing sound collector, and then determine its focal regions position, when optical fiber Fabry-Perot ultrasonic hydrophone is moved to focal regions position, brings the calculated value Δ V of feedback into correlation formula, the acoustic pressure P of the focal regions position of spherical focusing sound collector sound field is calculated.The present invention is able to achieve the accurate measurement of the acoustic pressure of spherical focusing sound collector sound field and focal regions position.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, and in particular to a kind of light for spherical focusing sound collector acoustic field
Fine Fabry-Perot hydrophone system.
Background technique
It is swift and violent with deepen continuously research and the cross discipline to technologies such as ultrasound thermal therapy, ultrasonic imaging, ultrasound thrombolysis
Development, high intensity focused ultrasound (High intensity focused ultrasound, HIFU) technology have obtained further hair
Exhibition has accumulated experience for HIFU Treatment Technique Popularizing use below.After 21 century, HIFU Treatment has been subjected to more and more
The favor of people, HIFU technology have become the hot issue of field of acoustics and the important front edge problem of whole world science and technology.HIFU technology warp
The development and progress of over half a century is crossed, validity that HIFU Treatment technology is shown, safety are to target conformal noninvasive disappear
Melt treatment tumour and brings hope.HIFU Treatment technology and the detection of HIFU sound field have pushed HIFU technology to lead in medical science jointly
The research and application in domain.In order to reach more excellent focusing effect, finer HIFU Treatment is realized, it is desirable that focal regions size
Further compression, focus acoustic pressure further increase.Currently, the conventional traveling wave type of focusing mentioning to the focusing capability of HIFU sound field
It rises and has been increasingly difficult to, spherical focusing sound collector also just comes into being.Spherical focusing sound collector can generate spherical HIFU sound
, can be realized the fine focus of sub-wavelength magnitude, the piezoelectric material inside spherical focusing sound collector can generate ultrasonic wave and
It can reflect ultrasonic wave, realize the multiple stacking of ultrasonic wave；If the opposite ultrasonic wave in direction of propagation in-phase stacking at focal regions,
By the great acoustic pressure for increasing focal regions, and focal regions are further compressed, or even form standing wave ring, HIFU acoustic pressure has been shifted onto one more
High level.Therefore, spherical focusing sound collector sound field focal regions are smaller, acoustic pressure is higher, temperature change is more violent, machinery effect
Answer, cavitation effect influence it is bigger, result in spherical focusing sound collector sound field detection difficulty increase.
CN103234619A discloses a kind of optical fiber Fabry-Perot ultrasound hydrophone and system, and which describe optical fiber
Fabry-Perot ultrasound water listens system and the fixture for clamping the hydrophone, and water listens system to be able to bear HIFU sound field
High temperature, and the characteristic with high spatial resolution, high sensitivity and temperature measurement simultaneously, fixture is using dismountable soft
Property clamping, fibre optic hydrophone will not be damaged.But it still has following problem: (1) being demodulated using traditional demodulation method, no
It is able to achieve the accurate measurement of the acoustic pressure of the focal regions position of spherical focusing sound collector sound field；(2) in order to guarantee that sufficiently high measurement is empty
Between resolution ratio, the band coating part of optical fiber Fabry-Perot ultrasonic hydrophone and core segment needs directly overhang out fixture, light
The core segment of fine Fabry-Perot ultrasonic hydrophone by HIFU mechanical effect, cavitation effect effect, it is easy to shake
It is dynamic, cause HIFU field measurement result inaccurate, the length for reducing the fixture that overhangs out can reduce shaking to a certain extent, but simultaneously
It will lead to fixture severe jamming sound field again, even more so that spherical focusing sound collector sound field shifts to an earlier date cavitation；(3) it is directed to the ball of high sound pressure
When shape focuses sound collector acoustic field, the band coating part of the optical fiber Fabry-Perot ultrasonic hydrophone for the fixture that overhangs out and fibre
Core segment will appear the severe shaking of comparison, or even occur shaking disconnected phenomenon, and the spherical focusing sound collector sound field of high sound pressure is caused to be surveyed
There is mistake in amount result；(4) the structure processing of flexible clamping position (i.e. flexible beam and collet) is relatively difficult, and processing cost is high.
Summary of the invention
The object of the present invention is to provide a kind of optical fiber Fabry-Perot water for spherical focusing sound collector acoustic field to listen
Device system, to realize the accurate measurement of the acoustic pressure of spherical focusing sound collector sound field and focal regions position.
Optical fiber Fabry-Perot hydrophone system of the present invention for spherical focusing sound collector acoustic field, packet
Include optical fiber Fabry-Perot ultrasonic hydrophone, hydrophone fixture, signal processing system, host computer, three-dimensional mobile platform and platform
Drive control device, host computer are connected with signal processing system, platform drive control device, and platform drive control device and three-dimensional movement are flat
Platform is connected, and signal processing system is connected with optical fiber Fabry-Perot ultrasonic hydrophone, optical fiber Fabry-Perot ultrasonic hydrophone
It is clamped on the hydrophone clamp, the probe of optical fiber Fabry-Perot ultrasonic hydrophone stretches out hydrophone fixture, with spherical focusing
The coupling of sound collector sound field, hydrophone fixture are mounted in three-dimensional mobile platform；The host computer is programmed to execute following step
It is rapid:
It is λ to signal processing system hair output wavelength when measuring spherical focusing sound collector sound field1Laser order, to
Platform drive control device hair control three-dimensional mobile platform is mobile to drive the probe of optical fiber Fabry-Perot ultrasonic hydrophone to carry out
The order of three-dimensional space scanning；
During the probe of optical fiber Fabry-Perot ultrasonic hydrophone carries out three-dimensional space scanning, from signal processing
I voltage variety Δ V is obtained at systemi；
According to i voltage variety Δ ViIt determines the sound-filed simulation of spherical focusing sound collector, and then determines spherical focusing collection
The focal regions position of sound device sound field；
When measuring the acoustic pressure of the focal regions position of spherical focusing sound collector sound field, the hair control of Xiang Pingtai drive control device is three-dimensional to be moved
Moving platform is mobile to drive the probe of optical fiber Fabry-Perot ultrasonic hydrophone to be moved to the order of focal regions position, at signal
Cut system hair output wavelength is λ1Laser order；
The voltage variety Δ V of m carrying sound pressure information is obtained from signal processing systemm, save as and carry acoustic pressure letter
The voltage variety of breath composes (i.e. voltage variety Δ VmIt is composed with the relationship of time)；
The reflectance spectrum that optical fiber Fabry-Perot ultrasonic hydrophone carries out length scanning acquisition is fitted, is obtained about defeated
Voltage outWith phaseRelationship fitting function:Wherein,
It selects to carry maximum voltage variety in the voltage variety spectrum of sound pressure information and to bring into as calculated value Δ V
Formula:In, optical fiber Fabry- is calculated
The change of cavity length amount Δ L of Perot ultrasonic hydrophone；
Bring the change of cavity length amount Δ L of optical fiber Fabry-Perot ultrasonic hydrophone into formula:In, the coke of spherical focusing sound collector sound field is calculated
The acoustic pressure P of domain position；
Wherein, j indicates saturation number (the i.e. maximum electricity in the voltage variety spectrum of carrying sound pressure information of calculated value Δ V
Press the saturation number of variable quantity), y0Indicate direct current bias amount, A indicates amplitude, and ω indicates the angular frequency of output interference fringe, xc
Indicate the initial phase of fitting function,pIndicate the ratio between water-mirror based fiber optica interface transmitted wave acoustic pressure and incidence wave acoustic pressure, tpsIt indicates
The ratio between mirror based fiber optica-quartz capillary interface transmitted wave acoustic pressure and incidence wave acoustic pressure, r0Indicate quartz capillary inner wall-air
The sound pressure reflection coefficient at interface, rp3Expression is reflected back quartz capillary-degasification water termination sound pressure reflection coefficient, and L indicates optical fiber
The initial cavity of Fabry-Perot ultrasonic hydrophone is long, LrIndicate that quartz capillary wall thickness, σ indicate quartz capillary Poisson's ratio, E
Indicate the Young's modulus of quartz capillary, k indicates ultrasonic wave wave number, naIndicate the refractive index in Fabry-Perot cavity, λ is indicated
Output light wavelength,1Indicate output light wavelength when current measurement,y0、
A, ω, xc are the parameter that host computer is fitted, na、tp、tps、L、E、r0、rp3、Lr、σ、k、λ1It is all to be set in host computer (20)
Fixed known parameters, j is by host computer according to formulaIt is calculated, int () indicates rounding operation, Δ V0It indicates
Maximum voltage and quiescent potential (the i.e. a length of λ of reflectance spectrum medium wave in the reflectance spectrum1When corresponding voltage) difference or work
Make the difference of point voltage and minimum voltage.
Specific measurement process are as follows: when measurement spherical focusing sound collector sound field, host computer sends out output wave to signal processing system
A length of λ1Laser order, it is λ that signal processing system, which receives output wavelength after the order,1Laser, laser passes after processing
Send to optical fiber Fabry-Perot ultrasonic hydrophone, host computer to platform drive control device send out control three-dimensional mobile platform it is mobile with
The probe of optical fiber Fabry-Perot ultrasonic hydrophone is driven to carry out the order of three-dimensional space scanning, platform drive control device receives
It is mobile that three-dimensional mobile platform is controlled after to the order, to drive optical fiber Fabry-Perot ultrasonic hydrophone by hydrophone fixture
Mobile, the probe of optical fiber Fabry-Perot ultrasonic hydrophone carries out three-dimensional space scanning, when optical fiber Fabry-Perot ultrasound water
When listening the probe of device by spherical focusing sound collector sound field reflecting, reflected light is by ultrasonic wave modulation, the interference light signal meeting of return
Sound field information is carried, i voltage variety Δ V is obtained after signal processing system is handledi, signal processing system is by i voltage
Variation delta ViSend host computer to, host computer is according to i voltage variety Δ ViDetermine the sound field point of spherical focusing sound collector
Cloth, and then determine the focal regions position of spherical focusing sound collector sound field；Measure the sound of the focal regions position of spherical focusing sound collector sound field
When pressure, host computer sends out control three-dimensional mobile platform movement to platform drive control device to drive optical fiber Fabry-Perot ultrasound water
The probe of device is listened to be moved to the order of focal regions position, control three-dimensional mobile platform is moved after platform drive control device receives the order
It is dynamic, focal regions position is moved to the probe by hydrophone fixture drive optical fiber Fabry-Perot ultrasonic hydrophone, host computer to
It is λ that signal processing system, which sends out output wavelength,1Laser order, it is λ that signal processing system, which receives output wavelength after the order,1
Laser, laser is sent to optical fiber Fabry-Perot ultrasonic hydrophone after processing, when optical fiber Fabry-Perot ultrasound water is listened
When sound field reflecting of the probe of device by spherical focusing sound collector focal regions position, reflected light is by ultrasonic wave modulation, the interference of return
Optical signal can carry sound field information, and the voltage variety Δ V of m carrying sound pressure information is obtained after signal processing system is handledm,
Signal processing system carries m the voltage variety Δ V of sound pressure informationmSend host computer to, host computer utilizes above-mentioned formula
The acoustic pressure P of the focal regions position of spherical focusing sound collector sound field is calculated.
The hydrophone fixture includes clamper, clamping head and clamping pipe, and it is axial logical that the center of clamper offers second
Hole, head have a whorl brace rod and flexible clamping jaw, and the end of flexible clamping jaw is conical chuck, and the center of clamping head offers the
One axially extending bore, first axis through-hole are made of the first connecting hole, the first taper hole and the first shield bore being sequentially communicated, clamping head
One end there is pin end, the first shield bore is located at the center of pin end, and the first connecting hole is with internal screw thread, the cone of the first taper hole
It spends and matches with the taper of conical chuck, clamping pipe is linked together by female connector and needle tubing to be constituted, and the inner hole of needle tubing is connected to mother
The cavity of connector, the internal diameter of needle tubing and the diameter of the band coating part of optical fiber Fabry-Perot ultrasonic hydrophone match, clamping
In the head insertion clamping head of device, whorl brace rod is spirally connected with the first connecting hole, can clamp optical fiber by squeezing conical chuck
The band jacket portions of Fabry-Perot ultrasonic hydrophone, clamping pipe are connected by the cooperation of female connector and pin end with clamping head
It connects.By the band jacket portions of flexible clamping jaw grip optical fiber Fabry-Perot ultrasonic hydrophone, optical fiber Fabry- is realized
The flexible clamping of Perot ultrasonic hydrophone；Connection clamping pipe, grip optical fiber Fabry-Perot ultrasonic hydrophone on clamping head
When, the band coating part of optical fiber Fabry-Perot ultrasonic hydrophone is located in needle tubing, optical fiber Fabry-Perot ultrasonic hydrophone
Core segment can also be located at needle tubing in, make band coating part and the fibre of optical fiber Fabry-Perot ultrasonic hydrophone indirectly
Core segment is provided with enough rigidity, can reduce shaking of the core segment of optical fiber Fabry-Perot ultrasonic hydrophone at focal regions,
Realize the accurate measurement of more high sound pressure；Needle tubing is small in size, reduces focal regions sound wave in the reflection on hydrophone fixture surface, reduces
The acoustic field signal of disorder can be realized intrusive measurement, and needle tubing had both protected optical fiber Fabry-Perot ultrasonic hydrophone
Band coating part and core segment, and can be reduced because the core segment of optical fiber Fabry-Perot ultrasonic hydrophone shakes generation
Small interference signal, so that spherical focusing sound collector sound field sound pressure measurement result is more accurate.
The hydrophone fixture further includes supporting rod, and the center of supporting rod is provided in the axial direction with sheath through-hole (for optical fiber
The band jacket portions of Fabry-Perot ultrasonic hydrophone pass through), one end of supporting rod has external screw thread；Described second is axial logical
Hole is by the second connecting hole, the second taper hole and the second shield bore that are sequentially communicated (for the band of optical fiber Fabry-Perot ultrasonic hydrophone
Jacket portions pass through) it constitutes, the second connecting hole has internal screw thread, and the second shield bore is located at center and the flexibility folder of whorl brace rod
The center of pawl, having in externally threaded one end insertion clamper for supporting rod, is spirally connected with the second connecting hole.Pass through the supporting rod that is spirally connected
Mode extend the entire length of hydrophone fixture, supporting rod is mounted on canonical measure workbench, supports entire hydrophone
Fixture.
The flexibility clamping jaw is made of two flexible arms of the axisymmetrical about clamper, and two flexible arms pass through one
End connect with whorl brace rod, the other end is with frustum and center is radially penetrated through along axis with opening on the cylinder of the second shield bore
It is formed to the straight trough of extension, the width (i.e. the distance between two flexible arms) of the straight trough is less than the hole of the second shield bore
Diameter, the main part of every flexible arm are the flexible support beam that outer surface is formed by way of otch, every flexible arm
End there is the male cone (strobilus masculinus) to match with the taper of the first taper hole.The flexible clamping jaw processing of this structure is more convenient, is processed into
This is lower and more firm to the flexible clamping with jacket portions of optical fiber Fabry-Perot ultrasonic hydrophone.Preferably, institute
The bottom surface for stating notch is parallel with the side of the straight trough.
The clamping pipe is made by stainless steel material, good rigidity, good corrosion resistance, and can form hard sound field side
Boundary reduces the absorption to sound wave.
The female connector is inner cone female Luer, and the pin end is outer cone female Luer.Inner cone female Luer and outer cone
The mode of Rule cone match of female Luer makes the connection for clamping pipe and clamping head more convenient, and connects quick, positioning
Accurately.
When grip optical fiber Fabry-Perot ultrasonic hydrophone, nothing of the optical fiber Fabry-Perot ultrasonic hydrophone from supporting rod
External screw thread one end sequentially passes through sheath through-hole, the second connecting hole, the second taper hole, the second shield bore, the first taper hole, the first sheath
Hole, the cavity of female connector and needle tubing inner hole, adjust optical fiber Fabry-Perot ultrasonic hydrophone to suitable position after, keep with
Clamp pipe relative position it is constant, then successively compression clamping head, screw clamper, screw supporting rod.
The present invention has the effect that
Using the above-mentioned optical fiber Fabry-Perot hydrophone system for spherical focusing sound collector acoustic field, can obtain
The standard of the acoustic pressure of the focal regions position of spherical focusing sound collector sound field is realized in the sound-filed simulation of spherical focusing sound collector and focal regions position
Really measurement, and sound pressure measurement range is big；Cooperate above-mentioned hydrophone fixture again, realizes the focal regions of spherical focusing sound collector sound field
The accurate measurement of the more high sound pressure of position.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of embodiment 1.
Fig. 2 is the connection of the signal processing system and host computer, optical fiber Fabry-Perot ultrasonic hydrophone in embodiment 1
Relation schematic diagram.
Fig. 3 is the structural schematic diagram of hydrophone fixture in embodiment 1.
Fig. 4 is the structural schematic diagram of the clamping pipe in embodiment 1.
Fig. 5 is the schematic cross-sectional view of the clamping head in embodiment 1.
Fig. 6 is the structural schematic diagram of the clamper in embodiment 1.
Fig. 7 is the vertical sectional view of the clamper in embodiment 1.
Fig. 8 is the schematic cross-sectional view of the supporting rod in embodiment 1.
Fig. 9 is the structural schematic diagram of optical fiber Fabry-Perot ultrasonic hydrophone.
Cross-sectional view when Figure 10 is hydrophone fixture grip optical fiber Fabry-Perot ultrasonic hydrophone in embodiment 1.
Figure 11 is the structural schematic diagram of hydrophone fixture in embodiment 2.
Figure 12 is the structural schematic diagram of the clamper in embodiment 2.
Figure 13 is the vertical sectional view of the clamper in embodiment 2.
Specific embodiment
It elaborates with reference to the accompanying drawing to the present invention, described embodiment is merely a preferred embodiment of the present invention.
As shown in figure 9, optical fiber Fabry-Perot ultrasonic hydrophone 1 include input/output optical fiber (i.e. single mode optical fiber), it is anti-
Penetrate optical fiber 132 and quartz capillary 131, one end of quartz capillary 131 and input/output fused fiber splice, the other end and reflection
132 welding of optical fiber, mirror based fiber optica 132 and quartz capillary 131 constitute the probe of optical fiber Fabry-Perot ultrasonic hydrophone 1, stone
It is super to naturally constitute optical fiber Fabry-Perot in two reflectings surface of air chamber as interference cavity for air chamber in English capillary 131
The Fabry-Perot cavity of sound hydrophone.Optical fiber Fabry-Perot ultrasonic hydrophone is used as optical fiber using quartz capillary 131
Fabry-Perot cavity is measuring ball with optical fiber Fabry-Perot ultrasonic hydrophone since quartz capillary is to temperature-insensitive
Shape can guarantee measurement accuracy when focusing sound collector sound field to avoid the influence that temperature is got higher.Optical fiber Fabry-Perot ultrasound water is listened
Device 1 is made of band jacket portions 11, band coating part 12 and core segment 13, the band of optical fiber Fabry-Perot ultrasonic hydrophone 1
The tail portion of jacket portions 11 has a hydrophone connector 14, and a part of input/output optical fiber is located at band jacket portions 11, band coating
In part 12, another part and quartz capillary 131, the mirror based fiber optica 132 of input/output optical fiber are integrated in core segment
13。
Embodiment 1: the optical fiber Fabry-Perot hydrophone for spherical focusing sound collector acoustic field as shown in Figure 1
System, including optical fiber Fabry-Perot ultrasonic hydrophone 1, hydrophone fixture 30, signal processing system 40, host computer 20, three-dimensional
Mobile platform 50 (i.e. X to, Y-direction, Z-direction mobile platform) and platform drive control device 60.As shown in Fig. 2, signal processing system 40
Including circulator 6, optical attenuator 7, photodetector 8, tunable laser 9 and controller 10, host computer 20 and controller 10
It is connected, controller 10 is connected with tunable laser 9, and tunable laser 9 is connected with optical attenuator 7, optical attenuator 7 and annular
The a port of device 6 is connected, and second port of circulator 6 and the hydrophone of optical fiber Fabry-Perot ultrasonic hydrophone 1 connect
First 14 are connected, and the third port of circulator 6 is connected with the input terminal of photodetector 8, the output end of photodetector 8 and control
Device 10 processed is connected.Host computer 20 is connected with platform drive control device 60, platform drive control device 60 and 50 phase of three-dimensional mobile platform
Even.Optical fiber Fabry-Perot ultrasonic hydrophone 1 is clamped in hydrophone fixture 30, and hydrophone fixture 30 is fixedly mounted on three
It ties up on mobile platform 50.
Hydrophone fixture 30 as shown in Figures 3 to 8, including supporting rod 5, clamper 2, clamping head 3 and clamping pipe 4.Folder
The center for holding bar 5 is provided in the axial direction with the sheath through-hole 51 that ribbon supply jacket portions 11 pass through, and one end of supporting rod 5 has outer spiral shell
Line.The center of clamper 2 offers the second axially extending bore, and the second axially extending bore is by the second connecting hole 23, second for being sequentially communicated
The second shield bore 25 that taper hole 24 and ribbon supply jacket portions 11 pass through is constituted, and the second connecting hole 23 has internal screw thread, clamper 2
Head has whorl brace rod 21 and flexible clamping jaw, and the second shield bore 25 is located at center and the flexibility clamping jaw of whorl brace rod 21
Center, flexible clamping jaw are made of two flexible arms of the axisymmetrical about clamper 2, two flexible arms by one end with spiral shell
There is frustum and center radially to penetrate through along axial direction with opening on the cylinder of the second shield bore 25 for the connection of line connecting rod 21, the other end
The straight trough 27 of extension and formed, the hole of the width (i.e. the distance between two flexible arms) of straight trough 27 less than the second shield bore 25
Diameter, the main part of every flexible arm are the flexible support beam 26 that outer surface is formed by way of otch 28, notch 28
Bottom surface it is parallel with the side of straight trough 27, the end of every flexible arm has male cone (strobilus masculinus), and the end of two flexible arms is collectively formed
Conical chuck 22.The center of clamping head 3 offers first axis through-hole, and first axis through-hole is by the first connecting hole for being sequentially communicated
31, the first shield bore 33 that the first taper hole 32 and ribbon supply jacket portions 11 pass through is constituted, and one end of clamping head 3 has pin end
34, pin end 34 is outer cone female Luer, and the first shield bore 33 is located at the center of outer cone female Luer, and the first connecting hole 31 has
The taper of internal screw thread, the taper and conical chuck 22 of the first taper hole 32 matches.Clamp pipe 4 using stainless steel material make and
At being linked together and constituted by female connector 41 and needle tubing 42, female connector 41 is inner cone female Luer, in the inner hole of needle tubing 42 is connected to
The cavity of female Luer is bored, the internal diameter of needle tubing 42 and the diameter of band coating part 12 match.Having for supporting rod 5 is externally threaded
One end is inserted into clamper 2, is spirally connected with the second connecting hole 23, in the head insertion clamping head 3 of clamper 2, whorl brace rod 21
It is spirally connected with the first connecting hole 31, by squeezing 22 energy clamping band jacket portions 11 of conical chuck, clamping pipe 4 is connect by inner cone Rule
Head with the cooperation of outer cone female Luer and connect with clamping head 3.
In assembly, the clamping pipe 4 of hydrophone fixture 30, clamping head 3, clamper 2 and supporting rod 5 are separated, optical fiber
Fabry-Perot ultrasonic hydrophone 1 from supporting rod 5 without external screw thread one end sequentially pass through sheath through-hole 51, second connecting hole 23,
Second taper hole 24, the second shield bore 25, the first taper hole 32, the first shield bore 33, the cavity of female connector 41 and needle tubing 42 inner hole,
After adjusting optical fiber Fabry-Perot ultrasonic hydrophone 1 to suitable position, keep constant with clamping 4 relative position of pipe, then successively
Clamping head 3 is connect with clamping pipe 4, clamper 2 is connect to screw with clamping 3 makes optical fiber Fabry-Perot ultrasonic hydrophone 1
Band jacket portions 11 are clamped by conical chuck 22, and supporting rod 5 is connect with clamper 2 and is screwed, then supporting rod 5 is fixedly mounted on
In three-dimensional mobile platform 50.Three-dimensional mobile platform 50 can drive hydrophone fixture 30 mobile, and then drive optical fiber Fabry-Perot
Ultrasonic hydrophone 1 carry out X to, Y-direction, Z-direction it is mobile, the scanning probe measurement of optical fiber Fabry-Perot ultrasonic hydrophone is spherical poly-
Burnt sound collector sound field.
As shown in Figure 10, after the assembly is completed, the head with jacket portions 11 of optical fiber Fabry-Perot ultrasonic hydrophone 1
Being aligned with the end face of the outer cone female Luer of clamping head 3 (can also stretch out the end face of outer cone female Luer, but cannot be resisted against
On the end face of inner cone female Luer), the band coating part 12 of optical fiber Fabry-Perot ultrasonic hydrophone 1 is located in needle tubing 42, light
A part and quartz capillary 131 of the input/output optical fiber of fine Fabry-Perot ultrasonic hydrophone 1, mirror based fiber optica 132
It overhangs outside needle tubing 42.
In the above-mentioned optical fiber Fabry-Perot hydrophone system for spherical focusing sound collector acoustic field, host computer 20
It is programmed to execute following steps:
When measuring spherical focusing sound collector sound field, sending out output wavelength to controller 10 is λ1Laser order, Xiang Pingtai
The hair control of drive control device 60 three-dimensional mobile platform 50 it is mobile with drive the probe of optical fiber Fabry-Perot ultrasonic hydrophone 1 into
The order of row three-dimensional space scanning；
During the probe of optical fiber Fabry-Perot ultrasonic hydrophone 1 carries out three-dimensional space scanning, from controller 10
Place obtains the i voltage variety Δ V that photodetector 8 exportsi；
According to i voltage variety Δ ViIt determines the sound-filed simulation of spherical focusing sound collector, and then determines spherical focusing collection
The focal regions position (i.e. the position of 70 meaning of label in Fig. 1) of sound device sound field；
When measuring the acoustic pressure of the focal regions position of spherical focusing sound collector sound field, the hair control of Xiang Pingtai drive control device 60 is three-dimensional
Mobile platform 50 is mobile to drive the probe of optical fiber Fabry-Perot ultrasonic hydrophone 1 to be moved to the order of focal regions position, to control
It is λ that device 10 processed, which sends out output wavelength,1Laser order；
The voltage variety Δ V of m carrying sound pressure information is obtained from controller 10m, save as and carry sound pressure information
Voltage variety composes (i.e. voltage variety Δ VmIt is composed with the relationship of time)；
By optical fiber Fabry-Perot ultrasonic hydrophone 1 carry out length scanning acquisition reflectance spectrum be fitted, obtain about
Output
VoltageWith phaseRelationship fitting function:Wherein,
It selects to carry maximum voltage variety in the voltage variety spectrum of sound pressure information and to bring into as calculated value Δ V
Formula:In, optical fiber Fabry- is calculated
The change of cavity length amount Δ L of Perot ultrasonic hydrophone；
Bring the change of cavity length amount Δ L of optical fiber Fabry-Perot ultrasonic hydrophone into formula:In, the coke of spherical focusing sound collector sound field is calculated
The acoustic pressure P of domain position；
Wherein, j indicates saturation number (the i.e. maximum electricity in the voltage variety spectrum of carrying sound pressure information of calculated value Δ V
Press the saturation number of variable quantity), y0Indicate direct current bias amount, A indicates amplitude, and ω indicates the angular frequency of output interference fringe, xc
Indicate the initial phase of fitting function, tpIndicate the ratio between water-mirror based fiber optica interface transmitted wave acoustic pressure and incidence wave acoustic pressure, tpsIt indicates
The ratio between mirror based fiber optica-quartz capillary interface transmitted wave acoustic pressure and incidence wave acoustic pressure, r0Indicate quartz capillary inner wall-air
The sound pressure reflection coefficient at interface, rp3Expression is reflected back quartz capillary-degasification water termination sound pressure reflection coefficient, and L indicates optical fiber
The initial cavity of Fabry-Perot ultrasonic hydrophone is long, LrIndicate that quartz capillary wall thickness, σ indicate quartz capillary Poisson's ratio, E
Indicate the Young's modulus of quartz capillary, k indicates ultrasonic wave wave number, naIndicate the refractive index in Fabry-Perot cavity, λ is indicated
Output light wavelength, λ1Indicate output light wavelength when current measurement, φ1Expression and λ1Corresponding phase, y0, A, ω, xc be the obtained parameter of fitting, na、tp、tps、L、E、r0、rp3、Lr、σ、
k、λ1It is all the known parameters set in host computer 20, optical fiber Fabry-Perot ultrasonic hydrophone 1 carries out length scanning acquisition
The mode of reflectance spectrum is the prior art, na、tp、tps、L、E、r0、rp3、Lr、σ、k、λ1Specific value acquisition modes be it is existing
Technology, j is by host computer 20 according to formulaIt is calculated, int () indicates rounding operation, that is, takesInteger portion
It is allocated as the value for j, Δ V0Indicate the maximum voltage and quiescent potential (the i.e. a length of λ of reflectance spectrum medium wave in aforementioned reflectance spectrum1When
Corresponding voltage) difference or quiescent potential and minimum voltage difference.
Specific measurement process are as follows:
When measuring spherical focusing sound collector sound field, host computer 20 issues control tunable laser 9 to controller 10 and exports
Wavelength is λ1Laser order, it is λ that controller 10, which receives control 9 output wavelength of tunable laser after the order,1Swash
Laser power is adjusted to suitable performance number by light, optical attenuator 7, and the laser after adjusting reaches optical fiber by circulator 6
Fabry-Perot ultrasonic hydrophone 1, power drive source apply continuous pump signal and give spherical focusing sound collector, spherical focusing collection
Sound device forms the lesser spherical focusing sound collector sound field of acoustic pressure in noise elimination degassed water sink, and host computer 20 is to platform drive control
The hair control three-dimensional mobile platform 50 of device 60 is mobile to drive the probe of optical fiber Fabry-Perot ultrasonic hydrophone 1 to carry out three-dimensional space
Between the order that scans, control three-dimensional mobile platform 50 is mobile after platform drive control device 60 receives the order, to be listened by water
Device fixture 30 drives optical fiber Fabry-Perot ultrasonic hydrophone 1 mobile, the probe of optical fiber Fabry-Perot ultrasonic hydrophone 1 into
The scanning of row three-dimensional space (is clamped in the probe of the optical fiber Fabry-Perot ultrasonic hydrophone 1 in hydrophone fixture 30 to spherical shape
The each position for focusing sound collector sound field measures), when the probe of optical fiber Fabry-Perot ultrasonic hydrophone 1 is by spherical shape
When focusing sound collector sound field reflecting, reflected light is by ultrasonic wave modulation, and the interference light signal of return can carry sound field information, through annular
Photodetector 8 is reached after device 6, photodetector 8 is converted into electric signal, exports (with spherical focusing sound collector sound field
Each position is corresponding) i voltage variety Δ Vi, and host computer 20 is sent to by controller 10, host computer 20
According to i voltage variety Δ ViIt determines the sound-filed simulation of spherical focusing sound collector, and then determines spherical focusing sound collector sound field
Focal regions position (i.e. the position of 70 meaning of label in Fig. 1).
It can not ignore when the stationary phase actual demodulation introduced due to laser transmission, and the voltage that arrives of actual measurement and phase
The relationship of position is all discrete data point, needs to be fitted to curve.Therefore, host computer 20 surpasses optical fiber Fabry-Perot
The reflectance spectrum that sound hydrophone 1 carries out length scanning acquisition is fitted, and is obtained about output voltageWith phasePass
The fitting function of system:Wherein,
When measuring acoustic pressure (for high sound pressure) of the focal regions position of spherical focusing sound collector sound field, host computer 20 drives to platform
The hair control three-dimensional mobile platform 50 of controller 60 is mobile to drive the probe of optical fiber Fabry-Perot ultrasonic hydrophone 1 to be moved to
The order of focal regions position, control three-dimensional mobile platform 50 is mobile after platform drive control device 60 receives the order, to pass through water
Listen device fixture 30 drive optical fiber Fabry-Perot ultrasonic hydrophone 1 probe be moved to focal regions position (i.e. quartz capillary 131,
Mirror based fiber optica 132 reaches focal regions position), it is λ that host computer 20, which issues control 9 output wavelength of tunable laser to controller 10,1
Laser order, it is λ that controller 10, which receives control 9 output wavelength of tunable laser after the order,1Laser, optical attenuation
Laser power is adjusted to suitable performance number by device 7, and the laser after adjusting reaches optical fiber Fabry-Perot by circulator 6
Ultrasonic hydrophone 1, power drive source apply short pulse pumping signal and give spherical focusing sound collector, and spherical focusing sound collector is being eliminated the noise
The spherical focusing sound collector sound field that high sound pressure is formed in degassed water sink, when the probe of optical fiber Fabry-Perot ultrasonic hydrophone 1
When sound field reflecting by spherical focusing sound collector focal regions position, reflected light is by ultrasonic wave modulation, the interference light signal meeting of return
Sound field information is carried, photodetector 8 is reached after circulator 6, photodetector 8 is converted into electric signal, obtains m and takes
Voltage variety Δ V with sound pressure informationm, the voltage variety Δ V of m carrying sound pressure informationmIt is transmitted to by controller 10
Host computer 20.
The probe of optical fiber Fabry-Perot ultrasonic hydrophone is coupled with spherical focusing sound collector sound field, leads to optical fiber
The Fabry-Perot cavity length of Fabry-Perot ultrasonic hydrophone changes, and is become with the voltage that this obtains m carrying sound pressure information
Change amount Δ Vm, host computer 20 save as carry sound pressure information voltage variety spectrum (i.e. voltage variety Δ VmWith the relationship of time
Spectrum).
Host computer 20 obtains phase using the variation of the acoustic pressure effect front and back of the focal regions position of spherical focusing sound collector sound field
The relationship of the change of cavity length amount Δ L of variation delta φ and optical fiber Fabry-Perot ultrasonic hydrophone and with voltage variety Δ
The formula of the relationship of V ' are as follows:
M is carried the voltage variety Δ V of sound pressure informationmIn maximum value (i.e. carry sound pressure information voltage change
Maximum voltage variety in amount spectrum) it is used as calculated value Δ V to bring this formula (1) (replacing Δ V ' therein with Δ V) into
The change of cavity length amount Δ L of optical fiber Fabry-Perot ultrasonic hydrophone is calculated.
Host computer 20 according to from ultrasonic wave at degassed water-mirror based fiber optica interface, mirror based fiber optica-quartz capillary interface, stone
English capillary-input/output optical fibre interface, degassed water-quartz capillary outer limiting sides, quartz capillary inner wall-Air Interface,
Propagation between five acoustic interfaces is analyzed, and optical fiber Fabry-Perot ultrasonic hydrophone and spherical focusing sound collector sound field are built
Model, obtain the relational expression of change of cavity length the amount Δ L and acoustic pressure P of optical fiber Fabry-Perot ultrasonic hydrophone:
It brings the change of cavity length amount Δ L of optical fiber Fabry-Perot ultrasonic hydrophone into this formula (2), can be calculated
The acoustic pressure P of the focal regions position of spherical focusing sound collector sound field.
Embodiment 2: the optical fiber Fabry-Perot hydrophone for spherical focusing sound collector acoustic field in the present embodiment
System, most of structure and measuring principle are same as Example 1, the difference is that: as shown in Figure 11 to Figure 13, water is listened
Device fixture 30 includes clamper 2, clamping head 3 and clamping pipe 4, and the center of clamper 2 offers what ribbon supply jacket portions 11 passed through
Second shield bore 25, the head of clamper 2 have whorl brace rod 21 and flexible clamping jaw, and the second shield bore 25, which is located at, to be threadedly coupled
The center at the center of bar 21 and flexible clamping jaw, flexible clamping jaw are made of two flexible arms of the axisymmetrical about clamper 2, and two
The column that root flexible arm with whorl brace rod 21 by connecting at one end, the other end is with frustum and center with the second shield bore 25
It is opened on body and radially penetrates through the straight trough 27 axially extended and formed, the width (i.e. the distance between two flexible arms) of straight trough 27
Less than the aperture of the second shield bore 25, the main part of every flexible arm is that outer surface is formed by way of otch 28
The bottom surface of flexible support beam 26, notch 28 is parallel with the side of straight trough 27, and the end of every flexible arm has male cone (strobilus masculinus), and two soft
Conical chuck 22 is collectively formed in the end of property arm.Clamping head 3, clamp pipe 4 specific structure and embodiment 1 in clamping head 3 and
The specific structure for clamping pipe 4 is identical, the connection side of the connection type and clamping pipe 4 and clamping head 3 of clamper 2 and clamping head 3
Formula is all identical as the description in embodiment 1.
In assembly, the clamping pipe 4, clamping head 3, clamper 2 of hydrophone fixture 30 are separated, optical fiber Fabry-Perot
Ultrasonic hydrophone 1 sequentially passes through the second shield bore 25, the first taper hole 32, first shield from one end without conical chuck of clamper 2
The inner hole of sets of holes 33, the cavity of female connector 41 and needle tubing 42, adjustment optical fiber Fabry-Perot ultrasonic hydrophone 1 arrive suitable position
Afterwards, it keeps constant with clamping 4 relative position of pipe, then successively connect clamping head 3 with clamping pipe 4, by clamper 2 and clamping 3
Connection screws and clamps the band jacket portions 11 of optical fiber Fabry-Perot ultrasonic hydrophone 1 by conical chuck 22, then by clamper
2 are fixedly mounted in three-dimensional mobile platform 50.
Claims (7)
1. a kind of optical fiber Fabry-Perot hydrophone system for spherical focusing sound collector acoustic field, including optical fiber
Fabry-Perot ultrasonic hydrophone (1), hydrophone fixture (30), signal processing system (40), host computer (20), three-dimensional movement
Platform (50) and platform drive control device (60), host computer (20) and signal processing system (40), platform drive control device (60)
It is connected, platform drive control device (60) is connected with three-dimensional mobile platform (50), signal processing system (40) and optical fiber Fabry-
Perot ultrasonic hydrophone (1) is connected, and optical fiber Fabry-Perot ultrasonic hydrophone (1) is clamped on hydrophone fixture (30),
The probe of optical fiber Fabry-Perot ultrasonic hydrophone (1) stretches out hydrophone fixture, and hydrophone fixture (30) is mounted on three-dimensional movement
On platform (50)；It is characterized in that, the host computer (20) is programmed to execute following steps:
It is λ to signal processing system (40) hair output wavelength when measuring spherical focusing sound collector sound field1Laser order, Xiang Ping
Platform drive control device (60) hair control three-dimensional mobile platform (50) is mobile to drive optical fiber Fabry-Perot ultrasonic hydrophone (1)
Probe carry out three-dimensional space scanning order；
During the probe of optical fiber Fabry-Perot ultrasonic hydrophone (1) carries out three-dimensional space scanning, from signal processing system
I voltage variety Δ V is obtained at system (40)i；
According to i voltage variety Δ ViIt determines the sound-filed simulation of spherical focusing sound collector, and then determines spherical focusing sound collector sound
The focal regions position of field；
When measuring the acoustic pressure of the focal regions position of spherical focusing sound collector sound field, Xiang Pingtai drive control device (60) hair control is three-dimensional to be moved
Moving platform (50) is mobile to drive the probe of optical fiber Fabry-Perot ultrasonic hydrophone (1) to be moved to the order of focal regions position, to
It is λ that signal processing system (40), which sends out output wavelength,1Laser order；
The voltage variety Δ V of m carrying sound pressure information is obtained at signal processing system (40)m, save as carrying sound pressure information
Voltage variety spectrum；
The reflectance spectrum that optical fiber Fabry-Perot ultrasonic hydrophone (1) carries out length scanning acquisition is fitted, is obtained about defeated
Voltage outWith phaseRelationship fitting function:Wherein,
It selects to carry maximum voltage variety in the voltage variety spectrum of sound pressure information and and brings formula into as calculated value Δ V:In, optical fiber Fabry-Perot is calculated
The change of cavity length amount Δ L of ultrasonic hydrophone；
Bring the change of cavity length amount Δ L of optical fiber Fabry-Perot ultrasonic hydrophone into formula:In, the coke of spherical focusing sound collector sound field is calculated
The acoustic pressure P of domain position；
Wherein, j indicates the saturation number of calculated value Δ V, y0Indicate direct current bias amount, A indicates amplitude, and ω indicates output interference item
The angular frequency of line, xc indicate the initial phase of fitting function, tpIndicate water-mirror based fiber optica interface transmitted wave acoustic pressure and incident wave sound
The ratio between pressure, tpsIndicate the ratio between mirror based fiber optica-quartz capillary interface transmitted wave acoustic pressure and incidence wave acoustic pressure, r0Indicate quartz wool
Thin tube inner wall-Air Interface sound pressure reflection coefficient, rp3Expression is reflected back quartz capillary-degasification water termination sound pressure reflection system
Number, L indicate that the initial cavity of optical fiber Fabry-Perot ultrasonic hydrophone is long, LrIndicate that quartz capillary wall thickness, σ indicate quartz wool
Tubule Poisson's ratio, E indicate the Young's modulus of quartz capillary, and k indicates ultrasonic wave wave number, naIt indicates in Fabry-Perot cavity
Refractive index, λ indicate output light wavelength, λ1Indicate output light wavelength when current measurement, y0, A, ω, xc be the obtained parameter of fitting, na、tp、tps、L、E、r0、rp3、Lr、σ、k、λ1All for upper
The known parameters set in position machine (20), j is by host computer according to formulaIt is calculated, int () indicates to be rounded fortune
It calculates, Δ V0Indicate the maximum voltage and quiescent potential in the reflectance spectrum difference or quiescent potential and minimum voltage it
Difference.
2. the optical fiber Fabry-Perot hydrophone system according to claim 1 for spherical focusing sound collector acoustic field
System, it is characterised in that: the hydrophone fixture (30) includes clamper (2), clamping head (3) and clamping pipe (4), clamper (2)
Center offer the second axially extending bore, head has whorl brace rod (21) and flexible clamping jaw, the end of flexible clamping jaw is to bore
Clevis head (22), the center of clamping head (3) offer first axis through-hole, and first axis through-hole is connected by be sequentially communicated first
Hole (31), the first taper hole (32) and the first shield bore (33) are constituted, and one end of clamping head (3) has pin end (34), the first shield
Sets of holes (33) are located at the center of pin end (34), and the first connecting hole (31) has internal screw thread, the taper and cone of the first taper hole (32)
The taper of clevis head (22) matches, and clamping pipe (4) is linked together and is constituted by female connector (41) and needle tubing (42), needle tubing (42)
Inner hole is connected to the cavity of female connector (41), and the internal diameter of needle tubing (42) and the band of optical fiber Fabry-Perot ultrasonic hydrophone (1) apply
The diameter of layer part (12) matches, and in head insertion clamping head (3) of clamper (2), whorl brace rod (21) connects with first
It connects hole (31) to be spirally connected, the band jacket portions of optical fiber Fabry-Perot ultrasonic hydrophone (1) can be clamped by squeezing conical chuck
(11), clamping pipe (4) is connect by female connector (41) with the cooperation of pin end (34) with clamping head (3).
3. the optical fiber Fabry-Perot hydrophone system according to claim 2 for spherical focusing sound collector acoustic field
System, it is characterised in that: the hydrophone fixture (30) further includes supporting rod (5), and the center of supporting rod (5) is provided in the axial direction with shield
It covers through-hole (51), one end of supporting rod (5) has external screw thread；Second axially extending bore is by the second connecting hole for being sequentially communicated
(23), the second taper hole (24) and the second shield bore (25) are constituted, and the second connecting hole (23) has internal screw thread, the second shield bore (25)
Positioned at the center of whorl brace rod (21) and the center of flexible clamping jaw, supporting rod (5) has the insertion clamping of externally threaded one end
In device (2), it is spirally connected with the second connecting hole (23).
4. the optical fiber Fabry-Perot hydrophone system according to claim 2 for spherical focusing sound collector acoustic field
System, it is characterised in that: the flexibility clamping jaw is made of two flexible arms of the axisymmetrical about clamper (2), two flexibilities
The cylinder that arm with whorl brace rod (21) by connecting at one end, the other end is with frustum and center with the second shield bore (25)
On open and radially penetrate through the straight trough (27) axially extended and formed, the hole of the width of the straight trough less than the second shield bore (25)
Diameter, the main part of every flexible arm are the flexible support beam (26) that outer surface is formed by way of otch (28), often
The end of root flexible arm has the male cone (strobilus masculinus) to match with the taper of the first taper hole (32).
5. the optical fiber Fabry-Perot hydrophone system according to claim 4 for spherical focusing sound collector acoustic field
System, it is characterised in that: the bottom surface of the notch (28) is parallel with the side of the straight trough (27).
6. according to any optical fiber Fabry-Perot water for spherical focusing sound collector acoustic field of claim 2-5
Listen device system, it is characterised in that: the clamping pipe (4) is made by stainless steel material.
7. according to any optical fiber Fabry-Perot water for spherical focusing sound collector acoustic field of claim 2-6
Listen device system, it is characterised in that: the female connector (41) is inner cone female Luer, and the pin end (34) is that outer cone Rule connects
Head.
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