CN110044464A - The non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone and system - Google Patents
The non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone and system Download PDFInfo
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- CN110044464A CN110044464A CN201910403485.1A CN201910403485A CN110044464A CN 110044464 A CN110044464 A CN 110044464A CN 201910403485 A CN201910403485 A CN 201910403485A CN 110044464 A CN110044464 A CN 110044464A
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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 non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone and system, belongs to technical field of optical fiber sensing.It the described method comprises the following steps: 1) obtaining reflectance spectrum；2) laser works point is adjusted, determines initial phase；3) reflectance spectrum phase transition, curve matching and solution inverse function；4) knots modification for calculating light phase, determines change of cavity length amount；5) non-linear acoustic pressure is demodulated according to coupling model.Compared with existing linear demodulation method, method and system provided by the invention are while guaranteeing the optical fiber Fabry-Perot hydrophone acoustic pressure demodulation range gear shaper without theoretical upper limit and accurate demodulation, moreover it is possible to overcome phase fuzzy problem.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, and in particular to the acoustic pressure demodulation techniques of fibre optic hydrophone.
Background technique
High intensity focused ultrasound (High intensity focused ultrasound, HIFU) technology, which is that one kind is non-, invades
The treatment technology of entering property, it is by external low energy focusing ultrasonic wave in internal target area, generates transient high temperature in target area, reaches and disappear
Melt the purpose of tissue.As soon as and parameter of the acoustic pressure as HIFU core the most, accurate measurement and demodulation acoustic pressure size seem lattice
It is outer important.Since HIFU sound field has sound focal regions size small, high-temperature effect, cavitation effect, the evident characteristics such as mechanical effect, so far
Until to the measurement of acoustic pressure and demodulation a kind of ideal method completely not yet.Optical fiber Fabry-Perot hydrophone is due to having
Spatial resolution height, temperature-insensitive, the advantages that being influenced small, high sensitivity, strong anti-electromagnetic interference capability by sound field cavitation, are one
The ideal sound-pressure measurement sensor of kind.
Currently, optical fiber Fabry-Perot hydrophone mainly uses the optimum linear bias point direct method of measurement to carry out acoustic pressure
Demodulation, this is a kind of linear demodulation method, causes the variation of phase to be converted into acoustic pressure using the linearity range of interference signal
Linear light intensity variation, to realize that acoustic pressure demodulates.But there is also following disadvantages for this method: 1) very due to the range of linearity
It is narrow, it is significantly less than practical acoustic pressure more than the acoustic pressure demodulated after the range of linearity, causes calculating error big；2) due to being a kind of line
Property demodulation method, interference signal output there are the upper limits, therefore there are acoustic pressure demodulate ceiling restriction；3) there are phase ambiguities to ask
Topic, i.e. for phase change caused by acoustic pressure in Near The Extreme Point, optical fiber Fabry-Perot hydrophone will to the minor change of phase
Extremely insensitive, the minor change of phase hardly causes the variation of interference signal, while can not determine that the variation of phase is to increase
Big or reduction.So the problem of being limited to this three aspect, optical fiber Fabry-Perot hydrophone uses optimum linear bias point
When the direct method of measurement carries out acoustic pressure demodulation, it is extremely limited.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of any operating point of optical fiber Fabry-Perot hydrophone non-linear acoustic pressure
Demodulation method and system determine the change of cavity length amount of Fabry-Perot cavity caused by acoustic pressure by adjusting laser works point,
Acoustic pressure calculating is carried out in conjunction with optical fiber Fabry-Perot hydrophone and the coupling model of sound field.On the one hand, this method can overcome most
There are the limitations of the acoustic pressure demodulation upper limit when good linear bias point direct method of measurement linear demodulation；On the other hand, this method is than best
The accuracy of the linear bias point direct method of measurement is higher；Further, this method can also overcome phase fuzzy problem, i.e., so that phase
Variation will not fall in Near The Extreme Point.
The scheme that the present invention solves above-mentioned technical problem is as follows:
A kind of non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone provided by the invention, packet
Include following steps:
1. obtaining reflectance spectrum: closing ultrasonic transducer, guarantee that ultrasonic wave is not applied to the optical fiber Fabry-Perot water and listens
On device, the discrete points data that record system output voltage V changes with laser wavelength λ, i.e. reflectance spectrum.
2. adjusting laser works point, initial phase is determined: Fourier transformation being carried out to reflectance spectrum, calculates Fabry-
The long L of Perot chamber chamber, and adjust laser works point.Operating point is arranged in the optimum linear of maximum slope in reflectance spectrum first
At bias point, if system output voltage caused by acoustic pressure reaches the maximum output voltage of present operating point, by operating point
Position moves down or moves up；If system output voltage caused by acoustic pressure reaches the minimum output voltage of present operating point,
Operating point location is moved up or moved down.Operating point is adjusted repeatedly, until system output voltage is defeated not in the maximum of present operating point
Out near voltage or minimum output voltage.After completing operating point setting, according toDetermine that ultrasonic wave is not applied to light
Initial phase φ when fine Fabry-Perot hydrophone0, wherein naFor Fabry-Perot cavity chamber air refractive index.
3. reflectance spectrum phase transition, curve matching and solution inverse function: according toReflectance spectrum is converted into output electricity
The discrete points data of V and light phase φ are pressed, and carries out least square fitting, the function for establishing output voltage V and light phase φ closes
It is V (φ), is fitted form are as follows:
Y0, A, xc, w are parameter to be fitted in formula, seek the inverse function V of formula (1)-1(φ) obtains light phase φ and output
The functional relation of voltage V are as follows:
K is integer in formula.
4. calculating the knots modification of light phase, change of cavity length amount is determined: opening ultrasonic transducer, ultrasonic wave is made to be applied to optical fiber
On Fabry-Perot hydrophone, record ultrasonic wave is applied to system output voltage V after optical fiber Fabry-Perot hydrophone1, root
The whole phase after ultrasonic wave effect is calculated according to the functional relation of light phase in step 3 and output voltage1, then in conjunction with initial phase
φ0Phase changing capacity Δ φ is obtained, and according to the long L of Fabry-Perot cavity chamber and laser works wavelength X0Ultrasonic wave is calculated to draw
The Fabry-Perot cavity change of cavity length amount Δ L risen.
5. demodulating non-linear acoustic pressure according to coupling model: according to Fabry-Perot cavity change of cavity length amount Δ L, in conjunction with light
Fine Fabry-Perot hydrophone and the coupling model of sound field calculate non-linear acoustic pressure P:
Wherein T2、T1For sound pressure transmission coefficient, E is the Young's modulus of stone optical fiber, and f is the frequency of ultrasonic wave, and c is ultrasonic wave
The velocity of sound in a fiber.
Present invention further propose that a kind of optical fiber Fabry-Perot hydrophone system for realizing the above method, mainly by
Optical fiber Fabry-Perot hydrophone, ultrasonic transducer, Wavelength tunable laser, optical fiber circulator, photodetector and data
Capture card composition.The laser of Wavelength tunable laser output reaches hydrophone, the reflected light of hydrophone by optical fiber circulator
After ultrasonic transducer is by ultrasonic wave modulation, photodetector is reached after optical fiber circulator and exports two-way voltage signal,
Data collecting card is accessed all the way, and another way directly exports.
Specifically, the optical fiber Fabry-Perot hydrophone includes: single mode optical fiber, reflected light in above system of the present invention
Fine and quartz capillary, the both ends of the quartz capillary respectively with the single mode optical fiber and mirror based fiber optica welding, the quartz
Air chamber in pipe is as interference cavity；Optical fiber Fabry-Perot water is naturally constituted between two reflectings surface of the air chamber
Listen the Fabry-Perot cavity of device.
Specifically, the ultrasonic transducer can be spherical ultrasonic transducer, it is also possible to annular ultrasonic transducer.
What the present invention had has the advantages that:
1. acoustic pressure demodulation method provided by the invention greatly expands acoustic pressure solution there is no the limitation of the acoustic pressure demodulation upper limit
Adjust range；
2. acoustic pressure demodulation method demodulation accuracy provided by the invention is high；
3. acoustic pressure demodulation method provided by the invention, not by the puzzlement of phase fuzzy problem, phase change caused by acoustic pressure is not
Near The Extreme Point can be fallen in, the direction of phase change can be distinguished.
It is easy that 4. optical fiber Fabry-Perot hydrophone demodulating system provided by the invention is simple, experimental system is built, and
It is reproducible, good to temperature-insensitive and the linearity to have the advantages that, can correctly describe the sound field characteristic of HIFU sound field.
Therefore, the non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone is to accurate measurement HIFU
Sound field is of great significance and potential practical value.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and examples:
Fig. 1 is that the non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone provided by the invention relates to
And optical fiber Fabry-Perot hydrophone structure schematic diagram.
Fig. 2 is using the non-linear acoustic pressure demodulation side in any operating point of optical fiber Fabry-Perot hydrophone provided by the invention
The system structure diagram of the embodiment of method.
Fig. 3 is the non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone provided by the invention
Demodulate flow chart.
Fig. 4 is the non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone provided by the invention
Reflectance spectrum and fitting back reflection spectrum.
Fig. 5 is the voltage waveform that system exports at orthogonal operating point.
Fig. 6 is the voltage waveform of system output after modification point.
In figure: 001. mirror based fiber optica, 002. quartz capillary, 003. input/output single mode optical fiber, 101.PC machine, 102.
Wavelength tunable laser, 103. first optical fiber, 104. optical fiber circulators, 105. second optical fiber, 106. optical fiber Fabry-Perot
Hydrophone, 107. ultrasonic transducers, 108. third optical fiber, 109. photodetectors, 110. data collecting cards, 111. output ends.
Specific embodiment
With reference to the accompanying drawing to the non-linear acoustic pressure solution in any operating point of optical fiber Fabry-Perot hydrophone provided by the invention
Method and system are adjusted to be described in further detail.But the range that this should not be interpreted as to the above-mentioned theme of the present invention is only limitted to below
Embodiment, the technology that all contents based on the claims in the present invention are realized all belong to the scope of the present invention.
Embodiment 1: the non-linear acoustic pressure demodulating system in any operating point of optical fiber Fabry-Perot hydrophone
Referring to Fig. 1, the non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone provided by the invention
The optical fiber Fabry-Perot hydrophone structure being related to includes: input/output single mode optical fiber 003, mirror based fiber optica 001 and quartz wool
Tubule 002, the both ends of the quartz capillary are respectively with the single mode optical fiber and mirror based fiber optica welding, sky in the quartz ampoule
Air cavity is as interference cavity；Optical fiber Fabry-Perot hydrophone is naturally constituted between two reflectings surface of the air chamber
Fabry-Perot cavity.
Fig. 2 is shown using the non-linear acoustic pressure solution in any operating point of optical fiber Fabry-Perot hydrophone provided by the invention
The system structure diagram of the embodiment of tune method, to cooperate the step of illustrating the method for the present invention.Optical fiber Fabry-Perot
Hydrophone system is mainly by optical fiber Fabry-Perot hydrophone 106, ultrasonic transducer 107, Wavelength tunable laser 102, light
Fine circulator 104, photodetector 109 and data collecting card 110 form.The laser warp that Wavelength tunable laser 102 exports
It crosses optical fiber circulator 104 and reaches optical fiber Fabry-Perot hydrophone 106, the reflected light of optical fiber Fabry-Perot hydrophone 106
After ultrasonic transducer 107 is by ultrasonic wave modulation, photodetector 109 is reached after optical fiber circulator 104 and exports two-way electricity
Signal is pressed, accesses data collecting card 110 all the way, another way connects output end 111.In system, ultrasonic transducer 107 can be spherical shape
Ultrasonic transducer is also possible to annular ultrasonic transducer.
Embodiment 2: the non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone
Fig. 3 is the demodulation method flow chart of this system, comprising the following steps:
1. obtaining reflectance spectrum: ultrasonic transducer 107 does not export, and guarantees that ultrasonic wave is not applied to optical fiber Fabry-Perot water
It listens on device 106, data collecting card 110 records the output voltage V of photodetector 109 with 102 wave of Wavelength tunable laser
Long λ changes increased discrete points data, i.e. reflectance spectrum, as shown in Figure 4.Then ultrasonic transducer 107 exports, and acts on ultrasonic wave
Onto optical fiber Fabry-Perot hydrophone.
2. adjusting laser works point, determine initial phase: PC machine 101 carries out Fourier transformation, meter to reflectance spectrum in Fig. 4
The long L of Fabry-Perot cavity chamber is calculated, and the operating point of Wavelength tunable laser 102 is set.Operating point is arranged anti-first
Penetrate spectrum in maximum slope optimum linear bias point at, see A point in Fig. 4, work as if system output voltage caused by acoustic pressure reaches
When maximum output voltage (reflectance spectrum maximum voltage subtracts present operating point corresponding voltage in reflectance spectrum) of preceding operating point, this phase
Position then can move down operating point location, such as be moved to B point in Fig. 4 near reflectance spectrum crest location；Similarly, if sound
Press caused by system output voltage reach present operating point minimum output voltage (reflectance spectrum minimum voltage subtract in reflectance spectrum when
Preceding operating point corresponding voltage) when, phase then can move up operating point location near reflectance spectrum wave trough position at this time, such as
It is moved to C point in Fig. 4.Adjust operating point repeatedly, until system output voltage not in the maximum output voltage of present operating point or
Near person's minimum output voltage, phase change can be allowed less than reflectance spectrum Near The Extreme Point, also just there is no what direction obscured to ask
Topic, is not influenced by phase ambiguity.It can be obtained when ultrasonic wave does not act on after completing operating point setting according to the wavelength of setting
Initial phase φ1.Light phase φ is represented by
N in formulaaFor air refraction in Fabry-Perot cavity.
3. reflectance spectrum phase transition, curve matching and solution inverse function: optical fiber Fabry-Perot hydrophone 106 belongs to low
Fineness hydrophone, from the light intensity I of 106 reflected light electric explorer 109 of optical fiber Fabry-Perot hydrophonerCan be approximately
Ir=2R (1-cos φ) Ii (2)
I in formulaiFor the output intensity of Wavelength tunable laser 102, R is air-optical fibre interface in Fabry-Perot cavity
Reflectivity.Due to light can be introduced during from optical fiber Fabry-Perot 106 reflected light electric explorer 109 of hydrophone it is attached
Add phase, and the reflectance spectrum obtained is discrete points data, the relationship for establishing arbitrary phase and output voltage if necessary just needs
It to carry out curve fitting to reflection spectrum signal.Therefore, reflectance spectrum is converted to output voltage V's and light phase φ according to formula (1)
Discrete points data, and least square fitting is carried out, the functional relation V (φ) of output voltage V Yu light phase φ are established, form is fitted
Are as follows:
Y0 in formula, A, xc, w are parameter to be fitted, as shown in figure 4, related coefficient is higher than 0.99 after fitting.Either
Cause Fabry-Perot cavity chamber after reflectance spectrum or ultrasonic transducer 107 output that ultrasonic transducer 107 obtains when not exporting
Long to change and then output voltage is caused to change, the output voltage V and light phase φ in the case of two kinds meet V (φ).
Seek the inverse function V of formula (3)-1(φ) obtains the functional relation of light phase φ Yu output voltage V are as follows:
K is integer in formula.
4. calculating the knots modification of light phase, determine change of cavity length amount: after ultrasonic transducer 107 exports, ultrasonic wave is applied to
Cause Fabry-Perot cavity change of cavity length after optical fiber Fabry-Perot hydrophone 106, final system output voltage changes.
It can determine that the whole phase after ultrasonic wave effect according to the voltage waveform convolution (4) that output end 111 exports2, final
To phase changing capacity Δ φ=φ caused by acoustic pressure2-φ1.And according to the long L of Fabry-Perot cavity chamber and laser works wavelength X0
Calculating Fabry-Perot cavity change of cavity length amount by formula (1) is
5. demodulating non-linear acoustic pressure according to coupling model: according to Fabry-Perot cavity change of cavity length amount Δ L, in conjunction with light
Fine Fabry-Perot hydrophone 106 and the coupling model of sound field demodulate non-linear acoustic pressure P are as follows:
T in formula2、T1For sound pressure transmission coefficient, E is the Young's modulus of stone optical fiber, and f is the frequency of ultrasonic wave, and c is ultrasonic wave
The velocity of sound in a fiber.
The present invention is analyzed below by way of voltage waveform as why not perplexed by phase fuzzy problem:
The voltage waveform to be demodulated that system exports at optimum linear bias point is as shown in figure 5, system is defeated in figure
Maximum (minimum) voltage has reached maximum (minimum) output voltage of present operating point out, and phase change is just at pole at this time
Near value point, system output voltage is extremely insensitive to phase change, can not identify the direction of phase change.Same acoustic pressure effect
Under, B point in Fig. 4 is revised as in operating point and postpones the voltage waveform to be demodulated of system output as shown in fig. 6, being at this time
System output maximum voltage is also not up to the maximum output voltage of present operating point, and corresponding phase change is less than extreme point；And
System output minimum voltage has passed over the minimum output voltage of present operating point, and corresponding phase change has passed over extreme value
Point.At this point, system output voltage is still sensitive to phase change, and the direction of phase change, phase at a, d point can be distinguished
Position direction is to reduce, and b, c point phase directional are to increase.
It should be noted that the selection of the laser works point of the method for the present invention is theoretically arbitrary, as long as phase can be allowed
Position changes less than or crosses extreme point.In the present embodiment, system output voltage is the maximum output electricity of present operating point
When pressure, laser works point position can also be moved up；It, can also when system output voltage is the minimum output voltage of present operating point
Laser works point position is moved down.This measure can allow phase to cross reflectance spectrum extreme point, can not also be influenced by phase ambiguity,
It is able to achieve goal of the invention.
Finally, above embodiments are only to illustrate the method for the present invention rather than limit, although referring to preferred embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that, it can modify to technical solution of the present invention
Or equivalent replacement should all cover without departing from the objective and range of technical solution of the present invention in claim of the invention
In range.
Claims (9)
1. a kind of non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone, which is characterized in that the side
Method the following steps are included:
(1) it obtains reflectance spectrum: closing ultrasonic transducer, guarantee that ultrasonic wave is not applied on optical fiber Fabry-Perot hydrophone, remember
The discrete points data that recording system output voltage V changes with laser wavelength λ, i.e. reflectance spectrum；
(2) laser works point is adjusted, determines initial phase: Fourier transformation being carried out to reflectance spectrum, calculates Fabry-Perot cavity
The long L of chamber, and adjust laser works point: operating point is arranged in the optimum linear bias point of maximum slope in reflectance spectrum first
Place, will be under operating point location if system output voltage caused by acoustic pressure reaches the maximum output voltage of present operating point
It moves or moves up；If system output voltage caused by acoustic pressure reaches the minimum output voltage of present operating point, by work
Point position moves up or down；Operating point is adjusted repeatedly, until system output voltage is not in the maximum output electricity of present operating point
Near pressure or minimum output voltage；After completing operating point setting, according toDetermine that ultrasonic wave is not applied to optical fiber
Initial phase φ when Fabry-Perot hydrophone0, wherein naFor Fabry-Perot cavity chamber air refractive index；
(3) reflectance spectrum phase transition, curve matching and solution inverse function: according toReflectance spectrum is converted into output voltage V
It with the discrete points data of light phase φ, and is fitted, establishes the functional relation V (φ) of output voltage V Yu light phase φ, negate
Function obtains the functional relation V of light phase φ Yu output voltage V-1(φ)；
(4) knots modification for calculating light phase, determines change of cavity length amount: opening ultrasonic transducer, ultrasonic wave is made to be applied to optical fiber
On Fabry-Perot hydrophone, system output voltage V is recorded1, closed according to the function of light phase and output voltage in step (3)
System calculates the whole phase after ultrasonic wave effect1, then in conjunction with initial phase φ0Phase changing capacity Δ φ is obtained, and according to Fabry-
The long L of Perot chamber chamber and laser works wavelength X0Calculate Fabry-Perot cavity change of cavity length amount Δ L caused by ultrasonic wave；
(5) non-linear acoustic pressure is demodulated according to coupling model: according to Fabry-Perot cavity change of cavity length amount Δ L, in conjunction with optical fiber
Fabry-Perot hydrophone and the coupling model of sound field demodulate non-linear acoustic pressure P.
2. the non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone according to claim 1,
Be characterized in that: the reflectance spectrum of step (1) described acquisition is that ultrasonic wave is not applied to system when on optical fiber Fabry-Perot hydrophone
The discrete points data that output voltage is obtained with laser works wavelength increase.
3. the non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone according to claim 1,
Be characterized in that: the selection of laser works point described in step (2) is arbitrary, as long as meeting system output voltage not current
The maximum output voltage or minimum output voltage of operating point are nearby.
4. the non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone according to claim 1,
Be characterized in that: curve matching is by output voltage V and light phase φ using least square fitting in step (3):
Y0, A, xc and w are parameter to be fitted in formula.
5. the non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone according to claim 4,
Be characterized in that: the last phase position of light phase described in step (4) is calculated according to formula (2), and formula (2) passes through the anti-letter of formula (1)
Number V-1(φ) is obtained:
K is integer in formula.
6. the non-linear acoustic pressure demodulation method in any operating point of optical fiber Fabry-Perot hydrophone according to claim 1,
Be characterized in that: acoustic pressure described in step (5) demodulates formula are as follows:
T in formula2、T1For sound pressure transmission coefficient, E is the Young's modulus of stone optical fiber, and f is the frequency of ultrasonic wave, and c is ultrasonic wave in light
The velocity of sound in fibre.
7. a kind of optical fiber Fabry-Perot hydrophone system for realizing any one of claim 1-6 the method, feature exist
In: the system comprises optical fiber Fabry-Perot hydrophone, ultrasonic transducer, Wavelength tunable laser, optical fiber circulator,
The laser of photodetector and data collecting card, Wavelength tunable laser output reaches optical fiber Fabry- by optical fiber circulator
Perot hydrophone, the reflected light of optical fiber Fabry-Perot hydrophone is after ultrasonic transducer is by ultrasonic wave modulation, by light
Photodetector is reached after fine circulator and exports two-way voltage signal, accesses data collecting card all the way, another way connects output end.
8. optical fiber Fabry-Perot hydrophone system according to claim 7, it is characterised in that: the optical fiber Fabry-
Perot hydrophone includes: single mode optical fiber, mirror based fiber optica and quartz capillary, the both ends of the quartz capillary respectively with it is described
Single mode optical fiber and mirror based fiber optica welding, the air chamber in the quartz ampoule is as interference cavity；In two reflections of the air chamber
The Fabry-Perot cavity of Fabry-Perot hydrophone is naturally constituted between face.
9. the non-linear acoustic pressure demodulation method of the dual wavelength of optical fiber Fabry-Perot hydrophone according to claim 1, special
Sign is: the ultrasonic transducer can be spherical ultrasonic transducer, be also possible to annular ultrasonic transducer.
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