CN203758611U - Non-diaphragm and all-fiber sound pickup sensing probe, and sensing probe set - Google Patents
Non-diaphragm and all-fiber sound pickup sensing probe, and sensing probe set Download PDFInfo
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- CN203758611U CN203758611U CN201420121193.1U CN201420121193U CN203758611U CN 203758611 U CN203758611 U CN 203758611U CN 201420121193 U CN201420121193 U CN 201420121193U CN 203758611 U CN203758611 U CN 203758611U
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- 239000000523 sample Substances 0.000 title claims abstract description 95
- 239000000835 fiber Substances 0.000 title claims abstract description 76
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000013307 optical fiber Substances 0.000 claims description 134
- 230000000694 effects Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 description 11
- 238000010168 coupling process Methods 0.000 description 11
- 238000005859 coupling reaction Methods 0.000 description 11
- 230000007246 mechanism Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 239000012634 fragment Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 241001416181 Axis axis Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
The utility model discloses a non-diaphragm and all-fiber sound pickup sensing probe, and a sensing probe set. The non-diaphragm and all-fiber sound pickup sensing probe comprises a sensing component. The sensing component is a fiber axis, which is formed by an axis body, a fiber and sound-sensitive material which can be deformed to sound. The fiber comprises an input terminal and an output terminal. The sound-sensitive material is attached to the outer surface of the axis body, and the fiber winds around the sound-sensitive material. Series-parallel connection between the sensing probes can be realized through connecting the fiber. The sensing probes are placed in sound environment, and the light-phase change generated by the sound can be adjusted. The non-diaphragm and all-fiber sound pickup sensing probe, and the sensing probe set are advantageous in that the sound-sensitive material and fiber are adopted by the fiber sound pickup sensing probe, and the phase change of the light pulse can be achieved under the effect of sound; The dependence of the fiber sound pickup sensing probe on the quality of the diaphragm or a spring can be removed, and thereby cost is low, and service lifetime is long; producing process is simple and producing demand is reduced.
Description
Technical field
The utility model belongs to optical fiber acoustic pickup technical field, is specifically related to sensing probe, sensing probe group without the full optical fiber acoustic pickup of diaphragm.
Background technology
Optical fiber acoustic pickup be a kind of by fiber optic sensing applications in the equipment of sound-detection, there are a series of advantages of Fibre Optical Sensor, as anti-electromagnetic interference (EMI), corrosion-resistant, safe and reliable, simple in structure etc.Meanwhile, it also has the features such as volume is little, highly sensitive, disguised strong, and it is measured, and dynamic range is wide, tonequality good.Therefore, optical fiber acoustic pickup and deformable means thereof enjoy researchers' favor.
Formerly technology one has been introduced a kind of fiber optic microphone sensing probe.This probe is to adopt simple intensity demodulation mode, and precision is limited.And the reproduction effect of sound depends on the quality of shell fragment and the position of shell fragment and multimode optical fiber to a great extent.Therefore, the requirement meeting of its manufacturing process is very strict.In addition, this sensing head can only use separately, cannot carry out connection in series-parallel.Reference: ZhangHongju, YaoShengli, MiLei, Theoreticalanalysisofsensingprobeinfibermicrophone, JournalofAppliedOptics, 2008, Vol.29, No.5, pp812-814.
Formerly technology two has proposed a kind of full optical fiber microphone based on MZ interferometer, the vibration of diaphragm is converted to the modulation of light path phase place, and demodulation accuracy improves.But similar with above-mentioned first technology one, the effect of sound depends on quality and the position of diaphragm.And, cannot realize the connection in series-parallel of multiple microphones, greatly limit the range of application of optical fiber acoustic pickup.Reference: WuDongfang, JiaBo, TheoreticalandExperimentalResearchofAllFiberMicrophoneBa sedonM-ZInterferometer, CHINESEJOURNALOFSENSORSANDACTUATORS, 2007, Vol.20, No.7, pp1528-1530.
Summary of the invention
The technical problems to be solved in the utility model is: existing optical fiber acoustic pickup sensing probe is strong to diaphragm quality dependence, and complex manufacturing technology, making require strict, and cost is high, and is difficult to realize the connection in series-parallel to sensing probe.
For solving the problems of the technologies described above, one of the present utility model is without the full optical fiber acoustic pickup of diaphragm sensing probe, comprise sensing element, described sensing element is fiber axis, fiber axis is made up of axis body, optical fiber and the sound sensitive material to sound generation deformation, optical fiber has input end and output terminal, and sound sensitive material invests axis body outside surface, and Optical Fiber Winding is on sound sensitive material.
Sound sensitive material is the material of a class to sound sensitive, and under sound effect, deformation can occur for it, and then causes that being wrapped in its outside optical fiber is stretched.This is current material.
A kind of principle of work without the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model is:
Sensing probe is placed in acoustic environment, under the effect of sound, is attached to the sound sensitive material generation deformation on fiber axis axis body, thereby the optical fiber being wrapped on sound sensitive material is stretched.When optical fiber stretches, the refractive index of its fibre core can change, thereby causes that the phase place of light pulse in optical fiber changes.Phase place-time that outside demodulating system demodulates without the full optical fiber acoustic pickup sensing probe of diaphragm place changes, thereby obtains the acoustic information at this place.Principle is as follows in detail:
Be placed in the environment of required detection by described without the full optical fiber acoustic pickup of diaphragm sensing probe, there is deformation in sound sensitive material under the effect of sound, and this deformation causes the variation of sound sensitive material external fiber.The light injecting in optical fiber is narrow linewidth coherent optical pulse, and its phase place is very sensitive to strain, temperature etc.Strain meeting causes the changes delta L of light path by changing refractive index and fiber lengths, be denoted as:
nl-n0l0＝ΔL
Wherein, n0 and n are respectively the refractive indexes before and after changing, and l0 and l are the fiber lengths before and after changing, the variation that Δ L is light path.
And the variation of phase place can be calculated according to following formula:
Wherein,
be that phase place changes, λ is light wavelength in a vacuum.Can find out, the changes delta L of light path, in the time of um magnitude, can produce the phase differential of several λ, and system is very sensitive.Phase place-time that demodulating system demodulates probe place changes, and just can obtain the acoustic information at this place.
Further; in order to make sound sensitive material, optical fiber, axis body on fiber axis of the present utility model in use be subject to better protection; extend the life-span of the utility model product; the utility model also comprises guard shield and base; described fiber axis is placed on base; guard shield is located at fiber axis outside, and described guard shield is provided with sound hole.
Further, described base comprises fiber axis base, input end fiber base and output terminal optical fiber base, wherein input end fiber base and output terminal optical fiber base are respectively equipped with optical fiber duct, described guard shield is by fiber axis shell, left wing's shell and right flank shell composition, fiber axis shell, left wing's shell and right flank shell cover on respectively fiber axis base, input end fiber base and output terminal optical fiber base exterior, described fiber axis is placed on described fiber axis base, described sound hole is located on fiber axis shell, fix position in full optical fiber acoustic pickup sensing head of the present utility model in order to make described optical fiber, described optic fibre input end is fixed in the corresponding optical fiber duct of described base by securing member respectively with output terminal.
Again further, the hole of sound described in the utility model is positioned at the side of described fiber axis shell and/or above, for collecting voice signal.
Further, axis body described in the utility model is cylindricality.
Again further, the xsect of the axis body of cylindricality described in the utility model is circular, quincunx, cloverleaf pattern or butterfly.
Further, axis body described in the utility model is spherical.
A kind of based on described without the full optical fiber acoustic pickup of diaphragm sensing probe without the full optical fiber acoustic pickup of diaphragm sensing probe group, without the full optical fiber acoustic pickup of diaphragm sensing probe, described without passing through to connect optical fiber series, parallel or connection in series-parallel between the full optical fiber acoustic pickup of diaphragm sensing probe more than comprising two.
A kind of based on described without the full optical fiber acoustic pickup of diaphragm sensing probe without the full optical fiber acoustic pickup of diaphragm sensing probe group principle of work:
Be connected by connecting optical fiber without the full optical fiber acoustic pickup of diaphragm sensing probe, can realize series, parallel and the connection in series-parallel of sensing probe.
The beneficial effects of the utility model are that the phase place by adopting sound sensitive material and optical fiber to realize light pulse under sound effect to optical fiber acoustic pickup sensing probe changes, having broken away from existing fiber acoustic pickup sensing probe relies on the quality of diaphragm or shell fragment, thereby make with low cost, long service life, and manufacture craft is simplified, and has reduced making requirement.In addition, the connection in series-parallel that can realize sensing probe without the full optical fiber acoustic pickup of diaphragm sensing probe of the present utility model, has widened the range of application of full optical fiber acoustic pickup.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram without fiber axis the first embodiment in the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model.
Fig. 2 is a kind of structural representation without the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model.
Fig. 3 is a kind of schematic diagram without fiber axis shell in the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model.
Fig. 4 is a kind of schematic diagram without base in the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model.
Fig. 5 is a kind of schematic diagram without fiber axis the second embodiment in the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model.
Fig. 6 is a kind of schematic diagram without the third embodiment of fiber axis in the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model.
Fig. 7 is a kind of schematic diagram without the 4th kind of embodiment of fiber axis in the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model.
Fig. 8 is a kind of schematic diagram without the 5th kind of embodiment of fiber axis in the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model.
Fig. 9 is based on a kind of acoustic pickup structural representation without diaphragm full optical fiber acoustic pickup sensing probe and phase sensitive domain reflectometer demodulating system of the utility model.
Figure 10 is a kind of a kind of series system schematic diagram without the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model.
Figure 11 is a kind of a kind of series-parallel system schematic diagram without the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model.
Figure 12 adopts a kind of full optical fiber acoustic pickup without the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model to realize the solution of voice signal to external world to change the line map.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
Fig. 1 to Fig. 4 has provided a kind of the first embodiment without the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model: this embodiment comprises guard shield 5, base 4, fiber axis 6, fiber axis 6 is positioned at guard shield 5 inside, described fiber axis 6 is made up of axis body 6-1, optical fiber 6-5 and sound sensitive material 6-2, optical fiber has input end 6-3 and output terminal 6-4, sound sensitive material 6-2 invests axis body 6-1 outside surface, optical fiber 6-5 is wound on axis body 6-1, axis body 6-1 is placed on base 4, and described guard shield 5 is provided with sound hole 7.Described base 4 is made up of fiber axis base 4-3, the output terminal optical fiber base 4-2 that is provided with the input end fiber base 4-1 of optical fiber duct and is provided with optical fiber duct, and described guard shield 5 is made up of fiber axis shell 5-3, the shell 5-1 of left wing and right flank shell 5-2.Described optic fibre input end 6-3 and output terminal 6-4 are fixed in the optical fiber duct of input end fiber base 4-1 and output terminal optical fiber base 4-2 by securing member 3 respectively.Described sound hole 7 is positioned at the side of described fiber axis shell 5-3.Axis body 6-1 is cylindrical.
Fig. 5 shows a kind of the second embodiment without fiber axis 6 in the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model, and its central axis is that xsect is quincuncial cylindricality, and all the other features are identical with the first embodiment.
Fig. 6 shows a kind of the third embodiment without fiber axis 6 in the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model, and its central axis is that xsect is the cylindricality of cloverleaf pattern, and all the other features are identical with the first embodiment.
Fig. 7 shows a kind of the 4th kind of embodiment without fiber axis 6 in the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model, and its central axis is that xsect is the cylindricality of butterfly, and all the other features are identical with the first embodiment.
Fig. 8 shows a kind of the 5th kind of embodiment without fiber axis 6 in the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model, and its central axis is spherical, and all the other features are identical with the first embodiment.
In the utility model sound hole 7 be positioned at the side of described fiber axis shell 5-3 or above and side and on regard to realization of the present utility model and do not affect, all can realize the utility model, be not repeated herein.
Fig. 9 shows based on a kind of acoustic pickup without diaphragm full optical fiber acoustic pickup sensing probe and phase sensitive domain reflectometer demodulating system of the utility model.Illustrated this acoustic pickup comprises that the continuous narrow linewidth laser 9, the first coupling mechanism 10, modulator 11, amplifier 12, circulator 13, the first connection optical fiber 14, the acoustic pickup sensing probe 15 that connect are successively connected optical fiber 16 with second, another road that another road after the first coupling mechanism 10 is connected to the second coupling mechanism 17, two balance detection device 18 and computing machine 19, the second coupling mechanisms 17 is connected with the output port of circulator 13.
Principle of work is: as shown in the figure, the light that narrow linewidth laser 9 sends is continuously divided into two-way through the first coupling mechanism 10.One tunnel is flashlight, another Lu Weiben flash of light preceding an earthquake.Flashlight enters modulator 11 along the light path 1001 between the first coupling mechanism 10 and modulator 11 and is modulated into pulsed light, this pulsed light enters amplifier 12, by the light path 1201 process circulators 13 between amplifier 12 and circulator 13, and the light path 1301 being connected between optical fiber 14 along circulator 13 and first from the port of circulator 13 outputs to the first connection optical fiber 14, and connect optical fiber 16 through acoustic pickup sensing probe 15, second.In the transmitting procedure of the first connection optical fiber 14, acoustic pickup sensing probe 15, the second connection optical fiber 16, there is Rayleigh scattering in flashlight.Backward scattered light will enter circulator 13 along the light path 1301 between the first connection optical fiber 14 and circulator 13, and together with this flash of light preceding an earthquake of exporting along the light path 1002 between the first coupling mechanism 10 and the second coupling mechanism 17 with the output terminal of the first coupling mechanism 10 through the light path 1302 between circulator 13 and the second coupling mechanism 17, enter the second coupling mechanism 17 and interfere, the light wave of interfering is converted into electric signal in two balance detection devices 18, imports in computing machine 19 and processes.
Figure 10 shows a kind of one without the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model and is connected in series mode.Illustrated embodiment comprises that successively the light source that connects and demodulating system 21, the first probe 22, first connect optical fiber 23, the second probe 24, second and connect that optical fiber 25, the 3rd probe 26, the 3rd connect optical fiber 27, the 4th probe 28, the 4th connects optical fiber 29, the 5th probe 30.
Principle of work is: the light that light source and demodulating system 21 are sent connects optical fiber 23, the second probe 24, second by the first probe 22, first successively and connects that optical fiber 25, the 3rd probe 26, the 3rd connect optical fiber 27, the 4th probe 28, the 4th connects optical fiber 29, the 5th probe 30, after light produces in the process of transmission, to Rayleigh scattering, backward scattered light Jiang Yanyuan road is back to light source and demodulating system 21.Can determine the position at each probe place according to the principle of optical time domain reflectometer, the time that then demodulates relevant position signal changes, the sound that just can obtain all probes simultaneously or specify probe place.
Figure 11 shows a kind of a kind of connection in series-parallel connected mode without the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model.Illustrated embodiment comprises light source and demodulating system 21 and photoswitch 31, light source and demodulating system 21 are divided into three branch roads after being connected with photoswitch 31, the first branch road is connected with the first connection optical fiber 23 in turn, the first probe 22 is connected optical fiber with second, the second branch road is connected with the 3rd in turn and connects optical fiber 27, the second probe 24 and is connected optical fiber 29, the three branch roads with the 4th and is connected with the 5th in turn and connects optical fiber 32, the 3rd and pop one's head in and 26 be connected optical fiber 33 with the 6th.
Principle of work is: the light that light source and demodulating system 21 are sent is by after photoswitch 31, is connected to the first connection optical fiber 23, the 3rd respectively connects optical fiber 27 and be connected optical fiber 32 with the 5th from different branch roads.In the time that photoswitch 31 is connected to the first connection optical fiber 23, light enters the first probe 22 through the first connection optical fiber 23 and is connected optical fiber 25 with second, backward Rayleigh scattering light will return according to former road, through the first connection optical fiber 23, photoswitch 31, enter light source and demodulating system 21, thereby obtain the acoustic information at the first probe 22 places.Photoswitch 31 is switched to the 3rd and connects when optical fiber 27, light by the 3rd connecting optical fiber 27, the second probe 24 is connected optical fiber 29 with the 4th, similar when its rear orientation light is connected the first connection optical fiber 23 with photoswitch 31, enters light source and demodulating system 21 is carried out demodulation.Photoswitch 31 switches to the 5th and connects when optical fiber 32 in like manner.
Figure 12 shows the demodulating information that adopts a kind of full optical fiber acoustic pickup without the full optical fiber acoustic pickup of diaphragm sensing probe of the utility model.The full optical fiber acoustic pickup sensing head that utilizes this version to external world disturbance information of sound signal has fine undistorted demodulation, can well demodulate the disturbance information of certain feature in different positions.
By to a kind of description without the full optical fiber acoustic pickup of diaphragm sensing probe embodiment of the utility model, can find that the phase place that the utility model passes through optical fiber acoustic pickup sensing probe to adopt sound sensitive material and optical fiber to realize light pulse changes, having broken away from existing fiber acoustic pickup sensing probe relies on the quality of diaphragm or shell fragment, thereby make with low cost, long service life, and manufacture craft is simplified, and has reduced making requirement.The connection in series-parallel that can also realize sensing probe without the full optical fiber acoustic pickup of diaphragm sensing probe of the present utility model, has widened the range of application of full optical fiber acoustic pickup.
Claims (8)
1. one kind without the full optical fiber acoustic pickup of diaphragm sensing probe, comprise sensing element, it is characterized in that: described sensing element is fiber axis (6), fiber axis (6) is made up of axis body (6-1), optical fiber (6-5) and the sound sensitive material (6-2) to sound generation deformation, optical fiber (6-5) has input end (6-3) and output terminal (6-4), sound sensitive material (6-2) invests axis body (6-1) outside surface, and optical fiber (6-5) is wound on sound sensitive material (6-2).
2. according to claim 1 without the full optical fiber acoustic pickup of diaphragm sensing probe, it is characterized in that: also comprise guard shield (5) and base (4), described fiber axis (6) is placed on base (4), guard shield (5) is located at fiber axis (6) outside, and described guard shield is provided with sound hole (7).
3. according to claim 2 without the full optical fiber acoustic pickup of diaphragm sensing probe, it is characterized in that: described base (4) comprises fiber axis base (4-3), input end fiber base (4-1) and output terminal optical fiber base (4-2), wherein input end fiber base (4-1) and output terminal optical fiber base (4-2) are respectively equipped with optical fiber duct, described guard shield (5) is by fiber axis shell (5-3), left wing's shell (5-1) and right flank shell (5-2) composition, fiber axis shell (5-3), left wing's shell (5-1) and right flank shell (5-2) cover on respectively fiber axis base (4-3), input end fiber base (4-1) and output terminal optical fiber base (4-2) outside, described fiber axis (6) is placed on described fiber axis base (4-3), described sound hole (7) is located on fiber axis shell (5-3), described optic fibre input end (6-3) is fixed in the optical fiber duct of input end fiber base (4-1) and output terminal optical fiber base (4-2) by securing member (3) respectively with output terminal (6-4).
4. according to claim 3 without the full optical fiber acoustic pickup of diaphragm sensing probe, it is characterized in that: described sound hole (7) is positioned at the side of described fiber axis shell (5-3) and/or above.
According to described in claim 1 to 4 any one without the full optical fiber acoustic pickup of diaphragm sensing probe, it is characterized in that: described axis body (6-1) is for cylindricality.
6. according to claim 5 without the full optical fiber acoustic pickup of diaphragm sensing probe, it is characterized in that: described axis body (6-1) xsect is circular, quincunx, cloverleaf pattern or butterfly.
According to described in claim 1 to 4 any one without the full optical fiber acoustic pickup of diaphragm sensing probe, it is characterized in that: described axis body (6-1) is spheroid.
One kind based on described in claim 1 to 4 any one without the full optical fiber acoustic pickup of diaphragm sensing probe without the full optical fiber acoustic pickup of diaphragm sensing probe group, it is characterized in that: without the full optical fiber acoustic pickup of diaphragm sensing probe, described without passing through to connect optical fiber series, parallel or connection in series-parallel between the full optical fiber acoustic pickup of diaphragm sensing probe more than comprising two.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420121193.1U CN203758611U (en) | 2014-03-17 | 2014-03-17 | Non-diaphragm and all-fiber sound pickup sensing probe, and sensing probe set |
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| CN201420121193.1U CN203758611U (en) | 2014-03-17 | 2014-03-17 | Non-diaphragm and all-fiber sound pickup sensing probe, and sensing probe set |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884417A (en) * | 2014-03-17 | 2014-06-25 | 南京派光信息技术有限公司 | Membrane-free all-fiber pick-up sensing probe, sensing probe set and sensing method |
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2014
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884417A (en) * | 2014-03-17 | 2014-06-25 | 南京派光信息技术有限公司 | Membrane-free all-fiber pick-up sensing probe, sensing probe set and sensing method |
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