CN204535846U - Measure the optical fiber grating sonic device of high-frequency transducer near-field acoustic pressure distribution - Google Patents
Measure the optical fiber grating sonic device of high-frequency transducer near-field acoustic pressure distribution Download PDFInfo
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- CN204535846U CN204535846U CN201520223912.5U CN201520223912U CN204535846U CN 204535846 U CN204535846 U CN 204535846U CN 201520223912 U CN201520223912 U CN 201520223912U CN 204535846 U CN204535846 U CN 204535846U
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Abstract
The utility model discloses a kind of optical fiber grating sonic device measuring the distribution of high-frequency transducer near-field acoustic pressure.Conventional piezoelectric is ceramic or PVDF ultrasonic hydrophone spatial resolution is low, strong to high frequency sound wave scattering.The utility model comprises D type standard single-mode fiber, polymkeric substance ridge thin film optical wave-guide Bragg grating and polymer-coated packed layer; D type standard single-mode fiber is the monox standard single-mode fiber that side polishing forms full-filling groove; Polymkeric substance ridge thin film optical wave-guide Bragg grating covers the full-filling groove bottom of D type standard single-mode fiber, and polymer-coated packed layer covers on polymkeric substance ridge thin film optical wave-guide Bragg grating; Polymkeric substance ridge thin film optical wave-guide Bragg grating comprises the thin film optical wave-guide of polymkeric substance ridge and grating line.The utility model can solve the problem that high-frequency transducer acoustic field efficiency is low, low precision, sound pressure sensitivity are low, and the near field characteristic being applicable to high frequency sound field is measured.
Description
Technical field
The utility model belongs to high frequency ultrasound field measurement field, is specifically related to a kind of optical fiber grating sonic device measuring the distribution of high-frequency transducer near-field acoustic pressure.
Background technology
Along with widely using of medical ultrasound, high-frequency transducer obtains applying more and more widely, the measurement of its sound field characteristic especially near-field acoustic pressure distribution is just being caused to the concern of people.The sound field characteristic of high-frequency transducer is normally detected by nautical receiving set, and the acoustical signal (amplitude, phase place) that the distribution of its near-field acoustic pressure then obtains diverse location by nautical receiving set spacescan obtains by data processing.Need reduce the disturbance of nautical receiving set to sound field to be measured as far as possible when considering near field measurement, the effective dimensions of General Requirements nautical receiving set should much smaller than 1/4th of wave length of sound.In addition, according to nyquist sampling law, the accuracy of sound pressure signal collection and validity are decided by the sampled data dot density in single wavelength, and the density of sampled point depends on effective dimensions and the spacescan precision of nautical receiving set.Consider above-mentioned two factors, reduce the effective dimensions of nautical receiving set sensitive element, the near-field acoustic pressure distribution of drawing high-frequency transducer can be accurately measured.Traditional nautical receiving set adopts piezoelectric ceramics or PVDF thin film to be prepared from as sensitive element usually, is limited to and designs and produces technique, and its effective dimensions generally arrives dozens of millimeter magnitude at several millimeters.For the high-frequency transducer of frequency of operation in 1MHz and even higher frequency, corresponding wave length of sound is at below 1.5mm, and according to aforementioned conclusion, traditional nautical receiving set precisely cannot draw the near-field acoustic pressure distribution of transducer.
Have benefited from the fast development of the advantages such as the size little (diameter of standard single mode or multimode optical fiber is only 0.1mm) of optical fiber, multiplexing capacity be strong and fiber grating sensing technology; adopt fiber grating as the sensitive element of nautical receiving set; become research and development focus at present, be expected to solve small size array and the extensive engineer applied problem such as multiplexing.Wherein, Fiber Bragg Grating FBG (FBG) is the grating adopting photoetching technique to form refractive index cycle distribution at fiber core place, its screen periods (pitch is in micron dimension) is much smaller than the wavelength of high frequency sound wave, therefore adopt FBG can obtain spatial resolution far above conventional piezoelectric nautical receiving set and directive property as the sensitive element of nautical receiving set, thus meet the basic demand of high frequency nautical receiving set near field measurement for spatial resolution and sound field perturbation.But bare optical fibers and bare optical gratings is used as nautical receiving set often exists the low problem of sound pressure sensitivity (only 0.007nm/MPa), therefore in the engineer applied of reality, normally adopt complicated external structure enhanced sensitivity technology and more high-precision wavelength interrogation technique; The former will increase the size of nautical receiving set thus reduce spatial resolution and measurement accuracy, and the latter will increase system complexity and detection difficulty.It is worth mentioning that in addition, adopt the FBG nautical receiving set of external structure enhanced sensitivity technology can only use as the device of single array element, losing optical fiber can the Inherent advantage of array.Therefore, improved the sound pressure sensitivity of nautical receiving set by inner structure enhanced sensitivity, be expected to the Measurement accuracy of the near-field acoustic pressure distribution realizing high-frequency transducer.
The sound pressure sensitivity of optical fiber grating sonic device is relevant with the Young modulus of silica glass material, adopts the less material of Young modulus to carry out enhanced sensitivity design to the inner structure of nautical receiving set sensitive element, is expected to improve sound pressure sensitivity, improves above-mentioned Problems existing.It is much smaller that the Young modulus (1GPa) of macromolecule polymer material compares silica glass (70GPa), simultaneously it is also the stock making integrated optical wave guide device, have with low cost, optical transmission loss is low, refractive index is high, device size is little, be easy to the advantage such as integrated.Adopt the extensive photoelectric device integrated techniques (getting rid of the technology such as film, photoetching, nano impression) such as semiconductive thin film very ripe at present, polymer micro-nano optical waveguide and the Bragg grating wave guide structure of excellent optical performance can be prepared.On the other hand, the optical fiber adopting side polishing technology to prepare D type structure, as the primitive of optical waveguide and light sensing, has also obtained maturation and has applied widely.If using thin polymer film waveguide bragg grating and the D type structured optical fiber compound sensitive element as nautical receiving set, utilize the photoconductive property of D-type optical fiber and the high sound pressure sensitivity advantage of evanescent wave coupling effect and polymer grating, thus accurately measuring of high frequency sound field near-field performance can be realized, be expected to the breakthrough realizing weak sound pitch frequency acquisition of signal field simultaneously.
Summary of the invention
The purpose of this utility model be for traditional piezoelectric ceramics or PVDF ultrasonic hydrophone size large, spatial resolution is low, to problems such as the bare optical fibers and bare optical gratings acoustic pressure sensitivity of hydrophone that high frequency sound wave scattering is strong and common are low, a kind of optical fiber grating sonic device measuring the distribution of high-frequency transducer near-field acoustic pressure is provided, this optical fiber grating sonic device has compact conformation, spatial resolution is high, sound pressure sensitivity is high and can the advantage such as array, the inefficiency existed when can solve high-frequency transducer acoustic field, low precision, sound pressure sensitivity is low waits series of problems, the near field characteristic being applicable to high frequency sound field is measured.
The utility model is achieved through the following technical solutions:
The utility model comprises D type standard single-mode fiber, polymkeric substance ridge thin film optical wave-guide Bragg grating and polymer-coated packed layer; Described D type standard single-mode fiber is the monox standard single-mode fiber that side polishing forms full-filling groove; Described polymkeric substance ridge thin film optical wave-guide Bragg grating covers the full-filling groove bottom of D type standard single-mode fiber, and polymer-coated packed layer covers on polymkeric substance ridge thin film optical wave-guide Bragg grating; Polymkeric substance ridge thin film optical wave-guide Bragg grating comprises the thin film optical wave-guide of polymkeric substance ridge and grating line; Described grating line is produced in the thin film optical wave-guide of polymkeric substance ridge by ultraviolet photoetching.
The length of described full-filling groove is 5 ~ 10mm, and groove depth is 1 ~ 2 μm.
The material of described polymer-coated packed layer is polyamine.
The length of described polymkeric substance ridge thin film optical wave-guide is 3 ~ 8mm, and thickness is 1 ~ 2 μm.
The material of described polymkeric substance ridge thin film optical wave-guide can be polymethylmethacrylate, polystyrene or polycarbonate.
Described grating line is mechanical periodicity, and the cycle is 572 ~ 660nm, and the grating total length of formation is 4 ~ 8mm.
The beneficial effect that the utility model has is: the utility model has compact conformation, size is little, spatial resolution good, sound pressure sensitivity is high, can array and the feature that between array element, phase-and-amplitude consistency is good, be applicable to the near-field acoustic pressure distribution measuring of high-frequency transducer, the near field detection of 200kHz and above high-frequency transducer can be realized.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure: 1, D type standard single-mode fiber, 2, polymkeric substance ridge thin film optical wave-guide Bragg grating, 3, polymer-coated packed layer.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in detail.
As shown in Figure 1, measure the optical fiber grating sonic device of high-frequency transducer near-field acoustic pressure distribution, be made up of D type standard single-mode fiber 1, polymkeric substance ridge thin film optical wave-guide Bragg grating 2 and polymer-coated packed layer 3; D type standard single-mode fiber 1 is the monox standard single-mode fiber of side polishing formation full-filling groove, and the length of full-filling groove is 5 ~ 10mm, and groove depth (throwing the degree of depth under fibre core) is 1 ~ 2 μm; Polymkeric substance ridge thin film optical wave-guide Bragg grating 2 covers the full-filling groove bottom of D type standard single-mode fiber 1; Polymer-coated packed layer 3 covers on polymkeric substance ridge thin film optical wave-guide Bragg grating 2; The material of polymer-coated packed layer 3 is polyamine, for packaging protection and further sound enhanced sensitivity; Polymkeric substance ridge thin film optical wave-guide Bragg grating 2 is made up of the thin film optical wave-guide of polymkeric substance ridge and grating line; The length of polymkeric substance ridge thin film optical wave-guide is 3 ~ 8mm, and thickness is 1 ~ 2 μm, and material can be polymethylmethacrylate, polystyrene or polycarbonate; Grating line is produced in the thin film optical wave-guide of polymkeric substance ridge by ultraviolet photoetching, and in mechanical periodicity, the cycle is 572 ~ 660nm, and the grating total length of formation is 4 ~ 8mm.
The principle of work of the optical fiber grating sonic device of this measurement high-frequency transducer near-field acoustic pressure distribution is as follows:
The sensing unit of this optical fiber grating sonic device is placed in sound field, and acoustical signal to be measured vertically acts on polymer-coated packed layer 3, make polymer-coated packed layer 3 produce along fiber axis to oscillating component.This oscillating component has the effect of following two aspects: first, and the forced vibration of polymer-coated packed layer 3 will directly act on polymkeric substance ridge thin film optical wave-guide Bragg grating 2, makes grating pitch that the change with acoustical signal same frequency to be measured occur; Because the Young modulus of polymer-coated packed layer 3 is more much smaller than silica glass, the strain facies therefore produced is to larger, and the frequency shift amount of consequent optical grating reflection spectrum is also larger.Secondly, the axial vibration component of polyamine materials also can be reflected by two polished end faces of the full-filling groove of D type standard single-mode fiber 1, form an acoustic resonance chamber, this resonant cavity contributes to amplifying further acoustical signal, and the velocity of sound of its resonant frequency by the chamber of resonant cavity in long and polyamine materials determined.To interact and in optical signal detecting at light and grating, incident light (continuous light source in broadband) to be come in and along spread fiber to polishing from an end coupling of optical fiber, i.e. polymkeric substance ridge thin film optical wave-guide Bragg grating 2 place, the luminous energy of a part, by being coupled into the form of the light that suddenly dies in polymkeric substance ridge thin film optical wave-guide Bragg grating 2, is formed reflectance spectrum by after optical grating reflection subsequently; Residue luminous energy by from the other end of optical fiber through, form transmitted spectrum.Owing to containing the larger not interactional light signal with grating of proportion in transmitted spectrum, therefore signal to noise ratio (S/N ratio) relative reflection spectrum is poor, selects the frequency displacement of test reflectance spectrum in actual applications.Under the effect of acoustical signal to be measured, by measuring the frequency displacement of reflectance spectrum signal, the information such as sound pressure corresponding to sound field to be measured, phase place and amplitude can be obtained.
Below in conjunction with the measurement effect that this optical fiber grating sonic device of concrete numbers illustrated distributes to high-frequency transducer near-field acoustic pressure.
If the length of full-filling groove (namely chamber, acoustic resonance chamber is long) is 5mm, then corresponding resonant acoustic wave wavelength l is 10mm, and the velocity of sound c of polyamine materials is 2000m/s, then can be calculated resonant frequency f according to f=c/l is 200kHz.That is, this optical fiber grating sonic device is except having except response to the acoustical signal of optional frequency, especially responsive to the acoustical signal of 200kHz.
Above-mentioned embodiment is for explaining explanation the utility model; instead of the utility model is limited; in the protection domain of spirit of the present utility model and claim, any amendment make the utility model and change, all fall into protection domain of the present utility model.
Claims (6)
1. measure the optical fiber grating sonic device of high-frequency transducer near-field acoustic pressure distribution, comprise D type standard single-mode fiber, polymkeric substance ridge thin film optical wave-guide Bragg grating and polymer-coated packed layer, it is characterized in that: described D type standard single-mode fiber is the monox standard single-mode fiber that side polishing forms full-filling groove; Described polymkeric substance ridge thin film optical wave-guide Bragg grating covers the full-filling groove bottom of D type standard single-mode fiber, and polymer-coated packed layer covers on polymkeric substance ridge thin film optical wave-guide Bragg grating; Polymkeric substance ridge thin film optical wave-guide Bragg grating comprises the thin film optical wave-guide of polymkeric substance ridge and grating line; Described grating line is produced in the thin film optical wave-guide of polymkeric substance ridge by ultraviolet photoetching.
2. the optical fiber grating sonic device of measurement high-frequency transducer near-field acoustic pressure distribution according to claim 1, is characterized in that: the length of described full-filling groove is 5 ~ 10mm, and groove depth is 1 ~ 2 μm.
3. the optical fiber grating sonic device of measurement high-frequency transducer near-field acoustic pressure distribution according to claim 1, is characterized in that: the material of described polymer-coated packed layer is polyamine.
4. the optical fiber grating sonic device of measurement high-frequency transducer near-field acoustic pressure distribution according to claim 1, is characterized in that: the length of described polymkeric substance ridge thin film optical wave-guide is 3 ~ 8mm, and thickness is 1 ~ 2 μm.
5. the optical fiber grating sonic device of measurement high-frequency transducer near-field acoustic pressure distribution according to claim 1, is characterized in that: the material of described polymkeric substance ridge thin film optical wave-guide can be polymethylmethacrylate, polystyrene or polycarbonate.
6. the optical fiber grating sonic device of measurement high-frequency transducer near-field acoustic pressure distribution according to claim 1, it is characterized in that: described grating line is mechanical periodicity, the cycle is 572 ~ 660nm, and the grating total length of formation is 4 ~ 8mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623918A (en) * | 2022-02-28 | 2022-06-14 | 浙江大学 | Low-pass filtering fiber grating hydrophone adopting tensile coating for sensitization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623918A (en) * | 2022-02-28 | 2022-06-14 | 浙江大学 | Low-pass filtering fiber grating hydrophone adopting tensile coating for sensitization |
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