CN106289503A - A kind of all-fiber ultrasound wave device for measuring sound intensity - Google Patents
A kind of all-fiber ultrasound wave device for measuring sound intensity Download PDFInfo
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- CN106289503A CN106289503A CN201610674328.0A CN201610674328A CN106289503A CN 106289503 A CN106289503 A CN 106289503A CN 201610674328 A CN201610674328 A CN 201610674328A CN 106289503 A CN106289503 A CN 106289503A
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- fiber
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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
Abstract
The present invention provides a kind of all-fiber ultrasound wave device for measuring sound intensity, for measuring, the sound intensity of ultrasound wave including laser emission element, Fiber isolation unit, optic fiber coupling unit, sound intensity probe unit, photoelectric detection unit and signal processing unit.Wherein, sound intensity probe unit includes a section single-mould fiber, has and is perpendicular to the flat surface that this single-mode fiber is axial；First port of optic fiber coupling unit is connected with Fiber isolation unit, and the second port is connected with single-mode fiber, and the 3rd port is connected with photoelectric detection unit.Laser occurs Fei Nieer reflect and produce return light on the flat surface of single-mode fiber, and the sound intensity in sound field residing for its intensity and single-mode fiber has corresponding relation, utilizes known ultrasound wave i.e. to can be used for after demarcating device measuring unknown ultrasound wave.The present invention provide device dynamic range wide, highly sensitive, not by electromagnetic interference, and simple structure understand, it is easy to manufacture and use.
Description
Technical field
The present invention relates to a kind of ultrasound wave device for measuring sound intensity, particularly relate to a kind of all-fiber ultrasound wave sound intersity measurement dress
Put.
Background technology
Along with development in science and technology, the ultrasonic technology application in fields such as machinery, electronics, aviation, chemical industry and medical treatment is increasingly
Extensively, as found range, test the speed, clean, welding, rubble, sterilizing etc..
In the application process of ultrasonic technology, the sound intensity is a highly important parameter, and it is measured ultrasonic transducer
Development and the application of ultrasound wave have very important effect.Such as, during the manufacture and debugging of ultrasonic cleaning device, need
Whether ultrasonic transducer to be detected is operated on optimum resonance point, and traditional method is that in observation rinse bath, the ripple of cleanout fluid is big
Little, although this method is directly perceived, but not accurate enough, also cannot quantify.
The measuring method of the existing ultrasound wave sound intensity mainly has following a few class: 1, Mechanical Method, the cardinal principle of such method
It is that sound wave can produce active force for receiving surface, causes receiving surface to produce displacement, can be anti-by the size measuring displacement
Release the sound intensity of sound wave；2, electric method, the principle of such method is the acoustic pressure utilizing piezoelectric hydrophone to measure sound field, thus measures
The sound intensity obtaining sound wave (sees the content disclosed in patent " ultrasonic sound intensity Detection & Controling method in water process ", Publication No.
CN102249367B)；3, pressure differential method, the principle of such method is to utilize the acoustic pressure effect of probe induced ultrasound wave, and by probe
It is connected with a U-tube, calculates according to liquid level difference in U-tube and draw the sound intensity；4, optical method, such method utilizes ultrasonic staying
The ripple diffraction to incident illumination, according to angle of diffraction obtain sound wave the sound intensity (see patent " a kind of measure ultrasound wave acoustic pressure and
The optical means of the sound intensity and device and application thereof " disclosed in content, Publication No. CN105352583A).
In the measuring method of the above-mentioned ultrasound wave sound intensity, sound intersity measurement method and device based on electromagnetic principles is easily by electromagnetism
Interference, shock resistance is poor.The sound intersity measurement method and device of optically-based principle have dynamic range wide, highly sensitive,
Not by advantages such as electromagnetic interference, have a good application prospect.
The how optically-based principle of interference of sound intersity measurement method of existing optically-based principle, and sound based on luminous intensity measurement
Strong measurement apparatus and method then do not have been reported that.
Summary of the invention
For solving the problems referred to above, present invention employs following technical scheme:
The present invention provides a kind of all-fiber ultrasound wave device for measuring sound intensity, for the sound intensity of ultrasound wave is measured, its
It is characterised by, including: laser emission element, it is used for producing laser；Fiber isolation unit, by optical fiber with laser emission element even
Connect, for transmitting the laser that laser emission element produces；Optic fiber coupling unit, at least has the first port, the second port and
Three ports, the first port is connected with Fiber isolation unit by optical fiber, and the laser of Fiber isolation unit transmission passes through the first port
Enter optic fiber coupling unit, and gone out by the second port transmission；Sound intensity probe unit, including a section single-mould fiber, this single-mode optics
Fine one end is connected with the second port of optic fiber coupling unit, receives the laser that the second port transmission is come, and the other end is end of probe,
Having the flat surface axially vertical with single-mode fiber, laser transmits in single-mode fiber, and occurs to take on this flat surface
Nie Er reflects and produces return light, and this return light passes optic fiber coupling unit back by the second port, and goes out through the 3rd port transmission
Go；Photoelectric detection unit, is connected with the 3rd port of optic fiber coupling unit, is used for receiving return light, and converts light signals into
The signal of telecommunication transfers out；Signal processing unit, is connected with photoelectric detection unit, receives the signal of telecommunication that photoelectric detection unit conveying comes
And this signal of telecommunication is processed.
Further, all-fiber ultrasound wave device for measuring sound intensity that the present invention provides, it is also possible to there is following technical characteristic:
Wherein, laser emission element is PIN-type photodiode, light cell or photomultiplier tube.
Further, all-fiber ultrasound wave device for measuring sound intensity that the present invention provides, it is also possible to there is following technical characteristic:
Wherein, Fiber isolation unit is fibre optic isolater.
Further, all-fiber ultrasound wave device for measuring sound intensity that the present invention provides, it is also possible to there is following technical characteristic:
Wherein, optic fiber coupling unit is fiber coupler.
Further, all-fiber ultrasound wave device for measuring sound intensity that the present invention provides, it is also possible to there is following technical characteristic:
Wherein, the coupled modes of fiber coupler are 1 × 2 or 2 × 2.
Further, all-fiber ultrasound wave device for measuring sound intensity that the present invention provides, it is also possible to there is following technical characteristic:
Wherein, photoelectric detection unit is photoelectric detector.
Further, all-fiber ultrasound wave device for measuring sound intensity that the present invention provides, it is also possible to there is following technical characteristic:
Wherein, sound intensity probe unit also includes a fixture, for clamping the end of probe of single-mode fiber.
Further, all-fiber ultrasound wave device for measuring sound intensity that the present invention provides, it is also possible to there is following technical characteristic:
Wherein, fixture is detachable clamp.
Invention effect and effect
The all-fiber ultrasound wave device for measuring sound intensity provided according to the present invention, owing to its sound intensity probe unit has one section of list
Mode fiber, the end of probe of this optical fiber has the flat surface axially vertical with single-mode fiber, and laser occurs Fei Nieer at this end face
Reflection, the decay producing return light and this return light is less.Return the light intensity of light and ultrasound wave in the sound field residing for end of probe
The sound intensity has corresponding relation, therefore, by the light intensity of this return light being measured and being analyzed measuring the data obtained,
I.e. can get the sound intensity of ultrasound wave to be measured.It is wide, highly sensitive, not by electromagnetic interference that the device that the present invention provides has dynamic range
Etc. advantage, and wherein all being connected by optical fiber between all parts, simple structure understands, it is easy to manufactures and uses.
Accompanying drawing explanation
Fig. 1 is the structural representation of all-fiber ultrasound wave device for measuring sound intensity that the present invention provides.
Detailed description of the invention
The detailed description of the invention of the present invention is described below in conjunction with drawings and Examples.
Embodiment
The structural representation of all-fiber ultrasound wave device for measuring sound intensity that Fig. 1 provides for the present invention.
As it is shown in figure 1, all-fiber ultrasound wave device for measuring sound intensity (hereinafter referred to as measurement apparatus) 10 bag that the present invention provides
Include laser emission element 1, Fiber isolation unit 2, optic fiber coupling unit 3, sound intensity probe unit 4, photoelectric detection unit 5 and letter
Number processing unit 6, wherein, sound intensity probe unit 4 includes a section single-mould fiber, and one end of this single-mode fiber is end of probe, has
The smooth end face axially vertical with this single-mode fiber formed by cutting, the other end is for connecting end.
As it is shown in figure 1, laser emission element 1 is connected with Fiber isolation unit 2, optic fiber coupling unit 3 has three ports,
It is respectively the first port 31, the second port 32, the 3rd port 33.Wherein, the first port 31 passes through optical fiber with Fiber isolation unit 2
Connecting, the 3rd port 33 is connected by optical fiber with photoelectric detection unit 5, the second port 32 and the single mode in sound intensity probe unit 4
The connection end of optical fiber is directly connected to.
In the present embodiment, laser emission element 1 is PIN-type laser instrument, and Fiber isolation unit 2 is fibre optic isolater, light
Electricity probe unit 5 is photoelectric detector；Optic fiber coupling unit 3 is fiber coupler, and coupled modes are 1 × 2.
Additionally, the end of probe of this single-mode fiber is clamped by releasable clamp (not shown), make this single-mode fiber permissible
Unloaded from this releasable clamp, or unloaded on all-fiber ultrasound wave device for measuring sound intensity 10 together with this releasable clamp
Under.
Below in conjunction with drawings and Examples, the measurement of all-fiber ultrasound wave device for measuring sound intensity that the present invention provides is described
Journey and principle.
First the single-mode fiber of sound intensity probe unit 4 is stretched in the sound field of ultrasound wave, make the end of probe of this single-mode fiber
It is completely in the medium of sound field.Opening laser emission element 1, this laser emission element 1 produces and Output of laser, this laser
Enter Fiber isolation unit 2, then from the first port 31 of optic fiber coupling unit 3 this optic fiber coupling unit 3 incoming, subsequently from the second end
Mouth 32 reaches the single-mode fiber in sound intensity probe unit 4, and in the end of probe end face generation Fei Nieer reflection of this single-mode fiber, produces
Raw reflection light, this reflection light is return light.This return light is transmitted back to optic fiber coupling unit 3 with tailing edge single-mode fiber, and from
Three ports 33 reach photoelectric detection unit 5.
Now, photoelectric detection unit 5 detects certain light intensity signal, and is translated into signal of telecommunication output at signal
Reason unit 6；The light intensity signal that this signal of telecommunication returns light with end of probe is corresponding.
Laser is shown in the reflectance such as following formula (1) of end of probe end face:
Wherein, n1It is the refractive index of fiber cores, n0It it is the refractive index of medium (such as water or air) in sound field.
When there being the ultrasound wave of some strength in sound field, medium is affected generation variable density by supersonic oscillations, its folding
Penetrate rate thus change.Ultrasound wave is designated as i cos2 π ft, and wherein, i is ultrasonic intensity, and f is ultrasonic frequency, and t is
Time；Owing to the variations in refractive index of medium presents the periodicity corresponding with the frequency of ultrasound wave, the therefore refractive index of medium
Variable quantity can be designated as Δ n cos2 π ft, and wherein Δ n is the maximum variable quantity of refractive index.Therefore, the refractive index of medium is n0+
Δn·cos2πft。
The laser intensity arriving the end of probe end face of single-mode fiber is designated as P0, telecommunications that photoelectric detection unit 5 is exported
Number intensity is designated as u, then shown in the calculating formula of u such as following formula (2):
Wherein, ρ is the sensitivity of photoelectric detection unit 5, and k is the Cross Coupling Ratio of optic fiber coupling unit 3.In view of Δ n
＜ ＜ n0, formula (2) can be with abbreviation:
Ignoring the second order of Δ n in a small amount, formula (3) can abbreviation be further:
From formula (4), after measurement apparatus 10 has manufactured, ρ, k, P0、n1It it is definite value；For same medium, n0Also
It it is definite value.Therefore, u is directly proportional to Δ n cos2 π ft.Additionally, due to the variations in refractive index of medium is to be affected generation by ultrasound wave
, Δ n and ultrasonic intensity i there is also relation one to one.
By standardizition, in a certain medium, utilize ultrasound wave known to a series of intensity that measurement apparatus 10 is carried out
After demarcation, the ultrasound wave that the sound intensity in same medium is unknown is measured by i.e. available test device 10, obtains unknown ultrasonic
The sound intensity of ripple.
What the sound intensity was measured by the measurement apparatus 10 utilizing the present invention to provide concretely comprises the following steps:
Step one, refractive index n of the medium in measurement sound field0.From formula (4), when sound field not existing ultrasound wave, i.e.
During intensity i=0 of ultrasound wave, Δ n=0.In the case of medium in sound field residing for ultrasound wave to be measured determines, in this sound field
When ultrasonic intensity is zero, measure with device 10, the signal of telecommunication u that photoelectric detection unit 5 obtains；Utilize signal processing unit
6, the numerical value of this u is substituted into formula (4) and solves, n can be calculated0Concrete numerical value.
Step 2, demarcates measurement apparatus 10.Use measurement apparatus 10 in above-mentioned medium, different n of the sound intensity
Ultrasound wave detects, and the sound intensity i of this n ultrasound wave is all it is known that respectively i1, i2... in；By measuring, obtain a series of
The signal of telecommunication u of photoelectric detection unit 5 output, is designated as u1, u2... un.Signal processing unit 6 is utilized to calculate, the most available
The a series of Δ ns corresponding with n ultrasound wave, i.e. Δ n1, Δ n2... Δ nn.By above-mentioned a series of sound intensity i, signal of telecommunication u and Δ n
Data be stored in signal processing unit 6, utilize signal processing unit 6 to be fitted calculating, i.e. can get Δ n and sound intensity i
Corresponding relation.
Step 3, measures ultrasound wave to be measured.Use calibrated measurement apparatus 10 that the to be measured of sound intensity the unknown is surpassed
Sound wave measures, and can obtain this signal of telecommunication u corresponding to ultrasound wave to be measuredx, by signal processing unit 6 to this signal of telecommunication ux
Process, calculate the Δ n of ultrasound wave to be measuredxAfter, can be calculated this according to the corresponding relation in step 2 to be measured
The sound intensity i of ultrasound wavex。
Additionally, due to light intensity AC signal frequency is identical with ultrasonic frequency f in formula (4), therefore can be by signal
Reason unit 6 obtains frequency f of ultrasound wave to be measured to light intensity signal frequency detectingx, and by the sound intensity i of ultrasound wave to be measuredxAnd frequency
fxExport together as testing result.
Return the luminous power of light and the sound intensity numerical value of the ultrasound wave of correspondence according to above-mentioned a series of end of probe, utilize signal
Processing unit 6 matching obtains the relation of sound intensity i and signal of telecommunication u, can realize demarcating to measurement apparatus 10；Use calibrated survey
The ultrasound wave to be measured that the sound intensity is unknown is measured by amount device 10, can obtain this signal of telecommunication u corresponding to ultrasound wave to be measuredx, logical
Cross signal processing unit 6 to this signal of telecommunication uxProcess and calculate, i.e. can obtain the sound intensity i of this ultrasound wave to be measuredx, additionally
Frequency f of ultrasound wave to be measured can be obtained according to light intensity AC signal frequencyx。
Embodiment effect and effect
The measurement apparatus that the present embodiment provides, owing to the light intensity that its principle is end of probe based on single-mode fiber return light is come
Realizing the measurement of ultrasound wave to be measured, therefore compared with the detection device of optically-based principle of interference, signal processing method is simpler
Single；All being attached by optical fiber between all parts, the unitary construction of device is simple and clear simultaneously, it is easy to manufactures and uses.
By the measurement to a series of known ultrasound wave, measurement apparatus can be demarcated, according to a series of calibration values,
Its sound intensity can be obtained by ultrasound wave to be measured is measured；Due to the end face of end of probe is smooth and with single-mode fiber
Axially vertical, therefore reflection light decay reduces, and the signal intensity that photodetector unit detects is good, measurement apparatus highly sensitive；
Additionally, also can get the frequency of ultrasound wave to be measured according to light intensity AC signal frequency.Therefore, the measurement apparatus that the present embodiment provides
Have dynamic range wide, highly sensitive, not by electromagnetic interference, the sound intensity of ultrasound wave to be measured and the excellent of frequency can be drawn simultaneously
Point.
Additionally, single-mode fiber itself has stronger impact resistance, therefore it is hardly damaged, repetitive measurement can be realized；And
And, even if the end face of this single-mode fiber damages, it is also possible to unloaded by releasable clamp, the part of damage is blocked, weight
Newly cut, can reuse after producing the new flat surface vertical with single-mode fiber.
Above-described embodiment is merely to illustrate embodiments of the present invention, is not intended to limit protection scope of the present invention.Right
From the point of view of those skilled in the art, as long as various change limits and the present invention that determines in described claim
In spirit and scope, these changes are apparent from, and all utilize the innovation and creation of present inventive concept all the guarantor of the present invention
The row protected.
Claims (8)
1. an all-fiber ultrasound wave device for measuring sound intensity, for measuring the sound intensity of ultrasound wave, it is characterised in that bag
Include:
Laser emission element, is used for producing laser；
Fiber isolation unit, is connected with described laser emission element by optical fiber, is used for transmitting described laser emission element and produces
Laser；
Optic fiber coupling unit, at least has the first port, the second port and the 3rd port, and described first port passes through optical fiber and institute
Stating Fiber isolation unit to connect, the laser of described Fiber isolation unit transmission is single through described first port incoming described optical fiber coupling
Unit, and gone out by described second port transmission；
Sound intensity probe unit, including the second end of a section single-mould fiber, one end of this single-mode fiber and described optic fiber coupling unit
Mouth connects, and receives the laser that described second port transmission is come, and the other end is end of probe, has axially vertical with described single-mode fiber
Flat surface, described laser transmits in described single-mode fiber, and on this flat surface occur Fei Nieer reflect and produce
Returning light, this return light is passed described optic fiber coupling unit back by described second port, and is gone out through described 3rd port transmission；
Photoelectric detection unit, is connected with the 3rd port of described optic fiber coupling unit, is used for receiving described return light, and is believed by light
Number being changed into the signal of telecommunication transfers out；
Signal processing unit, is connected with described photoelectric detection unit, receives the next signal of telecommunication of described photoelectric detection unit conveying also
This signal of telecommunication is processed.
All-fiber ultrasound wave device for measuring sound intensity the most according to claim 1, it is characterised in that:
Wherein, described laser emission element is PIN-type photodiode, light cell or photomultiplier tube.
All-fiber ultrasound wave device for measuring sound intensity the most according to claim 1, it is characterised in that:
Wherein, described Fiber isolation unit is fibre optic isolater.
All-fiber ultrasound wave device for measuring sound intensity the most according to claim 1, it is characterised in that:
Wherein, described optic fiber coupling unit is fiber coupler.
All-fiber ultrasound wave device for measuring sound intensity the most according to claim 4, it is characterised in that:
Wherein, the coupled modes of described fiber coupler are 1 × 2 or 2 × 2.
All-fiber ultrasound wave device for measuring sound intensity the most according to claim 1, it is characterised in that:
Wherein, described photoelectric detection unit is photoelectric detector.
All-fiber ultrasound wave device for measuring sound intensity the most according to claim 1, it is characterised in that:
Wherein, described sound intensity probe unit also includes a fixture, for clamping the end of probe of described single-mode fiber.
All-fiber ultrasound wave device for measuring sound intensity the most according to claim 7, it is characterised in that:
Wherein, described fixture is detachable clamp.
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| CN201610674328.0A CN106289503A (en) | 2016-08-16 | 2016-08-16 | A kind of all-fiber ultrasound wave device for measuring sound intensity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108988951A (en) * | 2018-06-26 | 2018-12-11 | 洛伦兹（北京）科技有限公司 | Fiber optical transceiver and coaxial R-T unit |
| CN109387276A (en) * | 2017-08-02 | 2019-02-26 | 重庆海扶医疗科技股份有限公司 | Ultrasonic sound intersity measurement method and system |
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| CN101762318A (en) * | 2010-01-21 | 2010-06-30 | 上海大学 | Optical fiber extrinsic Fabry-Perot interference ultrasonic sensing and detection device |
| US20110305118A1 (en) * | 2010-06-01 | 2011-12-15 | Drexel University | Fiber Optic Hydrophone Sensors And Uses Thereof |
| CN102944298A (en) * | 2012-11-06 | 2013-02-27 | 重庆大学 | End sensitive fiber bragg grating high-intensity focused ultrasound sensor and system |
| US20150114127A1 (en) * | 2013-10-31 | 2015-04-30 | Halliburton Energy Services, Inc. | Distributed acoustic sensing systems and methods employing under-filled multi-mode optical fiber |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101762318A (en) * | 2010-01-21 | 2010-06-30 | 上海大学 | Optical fiber extrinsic Fabry-Perot interference ultrasonic sensing and detection device |
| US20110305118A1 (en) * | 2010-06-01 | 2011-12-15 | Drexel University | Fiber Optic Hydrophone Sensors And Uses Thereof |
| CN102944298A (en) * | 2012-11-06 | 2013-02-27 | 重庆大学 | End sensitive fiber bragg grating high-intensity focused ultrasound sensor and system |
| US20150114127A1 (en) * | 2013-10-31 | 2015-04-30 | Halliburton Energy Services, Inc. | Distributed acoustic sensing systems and methods employing under-filled multi-mode optical fiber |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387276A (en) * | 2017-08-02 | 2019-02-26 | 重庆海扶医疗科技股份有限公司 | Ultrasonic sound intersity measurement method and system |
| CN108988951A (en) * | 2018-06-26 | 2018-12-11 | 洛伦兹（北京）科技有限公司 | Fiber optical transceiver and coaxial R-T unit |
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