CN203965028U - Ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration - Google Patents
Ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration Download PDFInfo
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- CN203965028U CN203965028U CN201420396237.1U CN201420396237U CN203965028U CN 203965028 U CN203965028 U CN 203965028U CN 201420396237 U CN201420396237 U CN 201420396237U CN 203965028 U CN203965028 U CN 203965028U
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Abstract
Ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration, its feature comprises LASER Light Source, optoisolator, Polarization Controller, 2 * 1 coupling mechanisms, single-mode transmission optical fiber, Side polishing fiber single-mode fiber, clearance, be coated with class " loudspeaker " spr sensor of golden film, total reflection film, photodetector, data collecting card (DAC) and PC; Described clearance is comprised of Side polishing fiber single-mode fiber and class " loudspeaker " spr sensor that is coated with golden film; Described side-polished fiber, clearance and class " loudspeaker " spr sensor that is coated with golden film form optical fiber vibration sensing head; External environment effect of vibration, in the golden film of class " loudspeaker " spr sensor, makes it to vibrate, and clearance is found to change, and makes changing of SPR spectrum, by detecting the intensity of certain wave strong point, can realize vibration survey.The utility model proposes a kind of ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration with practicality, low cost, ultra-sensitivity, intensity detection.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, particularly the ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration.
Background technology
Surface plasma body resonant vibration (Surface Plasmon Resonance, be called for short SPR) refer to when the P type polarization polychromatic light sending when light source passes through the interface of film metal and medium, if meet incident angle, be greater than the cirtical angle of total reflection, the gradient that has formed from the teeth outwards electron concentration distributes, form plasma oscillation, form surface plasma wave, existence due to surperficial evanescent wave field and metal complex index of refraction, the light that meets resonance wavelength is partly absorbed, the phenomenon that the light of its commplementary wave length is reflected.Nineteen sixty-eight, roentgen Otto and Kretschmann adopt the method for (AttenuatedTotal Reflection, be called for short ATR) in experiment, to realize the exciting of surface plasma of optical frequency wave band separately.1993, the people such as Jorgenson have realized the optical fiber chemical industry sensor based on SPR experimentally, than glass prism SPR sensor, it has, and volume is little, response is fast, cost is low, can realize the advantages such as on-line real time monitoring, has larger Research Prospects and economic worth.
Since after World War II, underwater acoustic technology has obtained significant progress under the advantage of military requirement promotes, sound field is to collect, transmit and process the important way of bathypelagic information, fibre optic hydrophone is a kind of underwater signal vibration transducer being based upon on optical fiber, photoelectron technology basis, is mainly used in the monitoring of acoustic propagation in marine acoustics environment, noise, reverberation, submarine acoustic characteristic, target acoustic characteristic etc.Fibre optic hydrophone is mainly divided into intensity type, polarization-type and phase interference type, and wherein interfere type is the focus of studying at present.Interference type optical fiber hydrophone is to utilize sound wave to modulate the phase place of light in single-mode fiber coil, makes sensor fibre coil generation elastic effect and strain effect, and fiber optic coils produces vibration as sensing unit.In report, there is at present the free overflow type structure of the cylindrical hollow of employing, pickup arm Optical Fiber Winding is on elastic body outer, reference arm optical fiber is wrapped on internal layer elastic body as acoustic vibration probe, and this structural sensitivity depends primarily on elastomeric sensitivity, the low and complex structure of sensitivity; Someone utilize simple rack in conjunction with long period fiber grating the vibration transducer as nautical receiving set, this design physical construction is simplified relatively, but long period fiber grating is subject to the impact of the cross parameters such as crossover temperature, refractive index, strain, therefore need complicated signal solution system; Middle ship heavy industry 715 associating Zhejiang University of research institute reported adopt metal clips as the optical fiber raster vibration sensor of sensitization structure the probe as nautical receiving set, Michelson interferometer carries out demodulation, this structure is compared above and is reported that sensitivity increases to some extent, but cost increases.These vibration transducers as fibre optic hydrophone otherwise complex structure, otherwise demodulated equipment is expensive, otherwise just need complicated data handling procedure, and the sensitivity of each structure is not high on the whole, the shortcoming of these vibration transducers seriously hinders development and the application of fibre optic hydrophone.
For vibration sensing head complex structure in above-mentioned fibre optic hydrophone, measure that cost is high, the problem such as data processing complex, sensitivity are low, the utility model proposes a kind of ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration.In the utility model, using the gold-plated film of class " loudspeaker " structural base as sound wave Receiver, optical fiber vibration sensing head with Side polishing fiber single-mode fiber formation, along with acoustic vibration, the gap between golden film and optical fiber changes, thereby SPR resonance wavelength is changed.Therefore, the ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration the utility model proposes can be realized the ultra-sensitivity sensing of microvibration, and simple in structure, cost is low, has very strong practical value.
Utility model content
In order to overcome vibration sensing head complex structure in fibre optic hydrophone, measure that cost is high, the problem such as data processing complex, sensitivity are low, the utility model proposes a kind of simple in structure, ultra-sensitivity, low cost, the practical ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration.
The utility model is the technical scheme that technical solution problem is taked:
Ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration, comprising: LASER Light Source, optoisolator, Polarization Controller, 2 * 1 coupling mechanisms, single-mode transmission optical fiber, Side polishing fiber single-mode fiber, be coated with class " loudspeaker " spr sensor, total reflection film, photodetector, data collecting card (DAC) and the PC of golden film.
The output terminal of LASER Light Source is connected with optoisolator input end, the output terminal of optoisolator is connected with Polarization Controller, one end that 2 * 1 coupling mechanisms have a two-port is connected with photodetector respectively at the output terminal of Polarization Controller, data collecting card (DAC) is connected with PC with the output terminal of photodetector respectively, and wherein photodetector has time resolution characteristics; One end of a port and one end of single-mode transmission optical fiber of 2 * 1 coupling mechanisms are connected, and the other end of single-mode transmission optical fiber is connected with the uncoated one end of Side polishing fiber single-mode fiber, and the other end of Side polishing fiber single-mode fiber is coated with total reflection film.Side polishing fiber single-mode fiber forms clearance with class " loudspeaker " spr sensor that is coated with golden film, the thickness of Side polishing fiber single-mode fiber residue covering is between 50nm～250nm, the width of clearance is between 1nm～12nm, gold film thickness is between 40nm～70nm, the root mean square of surfaceness is less than or equal to 5nm, and the metallic film of gold-plated film has good elasticity, pliability and thickness between 1mm～5mm, and total reflection film is more than or equal to 90% to the reflectivity of resonance wavelength; By Side polishing fiber single-mode fiber, clearance, class " loudspeaker " spr sensor that is coated with golden film, form ultra-sensitivity optical fiber vibration sensing head.Photodetector and data collecting card (DAC) are as the detuner of spr sensor.
The beneficial effects of the utility model are:
Class " loudspeaker " spr sensor that the utility model utilizes Side polishing fiber single-mode fiber, clearance, be coated with golden film is as ultra-sensitivity optical fiber vibration sensing head, when there is vibration in external environment, the gold coated films that is coated with class " loudspeaker " spr sensor of golden film also vibrates, the width of clearance is along with vibration changes, make SPR spectrum change, by detecting the intensity at wavelength undetermined place, can realize supersensitive vibration survey.
The utility model utilizes total reflection film as catoptron, simple in structure, realizes the reflective measurement of highly sensitive vibration.
In the utility model, demodulating system is used photodetector, realizes the detection of light intensity, has avoided the use of expensive spectrum (FBG) demodulator equiwavelength checkout equipment, has reduced cost.
Accompanying drawing explanation
Fig. 1 is the ultra-sensitivity hydrophone structure schematic diagram based on surface plasma body resonant vibration.
Embodiment
Below in conjunction with accompanying drawing, utility model is further described.
As shown in Figure 1, the ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration, comprises LASER Light Source 1, optoisolator 2, Polarization Controller 3,2 * 1 coupling mechanism 4, single-mode transmission optical fiber 5, Side polishing fiber single-mode fiber 6, clearance 7, is coated with class " loudspeaker " spr sensor 8 of golden film, total reflection film 9, photodetector 10, data collecting card (DAC) 11 and PC 12.The output terminal of LASER Light Source 1 is connected with optoisolator 2, the output terminal of optoisolator 2 is connected with Polarization Controller 3, one end of the two-port of 2 * 1 coupling mechanisms 4 is connected with photodetector 10 input ends with the output terminal of Polarization Controller 3 respectively, port one end for 2 * 1 coupling mechanisms 4 is connected with one end of single-mode transmission optical fiber 5, the other end of single-mode transmission optical fiber 5 is connected with the uncoated one end of Side polishing fiber single-mode fiber 6, class " loudspeaker " spr sensor 8 that is coated with golden film forms clearance 7 with Side polishing fiber single-mode fiber 6, the other end of Side polishing fiber single-mode fiber 6 is coated with total reflection film 9, data collecting card (DAC) 11 is connected with PC 12 with photodetector 10 output terminals respectively.P polarized light is by LASER Light Source 1, optoisolator 2 and Polarization Controller 3 structure generations; By Side polishing fiber single-mode fiber 6, clearance 7 and class " loudspeaker " spr sensor 8 that is coated with golden film, form ultra-sensitivity optical fiber vibration sensing head, the thickness of Side polishing fiber single-mode fiber 6 residue coverings is between 50nm～250nm, the width of clearance 7 is between 1～12nm, be coated with class " loudspeaker " spr sensor 8 of golden film as SPR sensing unit, gold film thickness is between 40nm～70nm, the root mean square of surfaceness is less than or equal to 5nm, and the metallic film that is coated with golden film has good elasticity, pliability and thickness between 1mm～5mm; The reflectivity of 9 pairs of resonance wavelengths of total reflection film is more than or equal to 90%; Photodetector 10, data collecting card 11 and PC 12 form signal demodulation part.
Working method of the present utility model is: LASER Light Source 1 produces flashlight, by single-mode transmission optical fiber, be input to optoisolator 2, the light signal of optoisolator 2 outputs is controlled output by Polarization Controller 3 and is become P polarized light, P polarized light is by the 2_1 port input of 2 * 1 coupling mechanisms 4, the P polarized light of exporting from the 1_1 port of 1 * 2 coupling mechanism 4 is transferred to side-polished fiber 6 by single-mode transmission optical fiber 5, thickness minimizing due to side-polished fiber covering, some patterns of fibre core and covering are coupled to transmission in clearance 7 with the form of evanescent wave, in clearance 7, the light wave of the pattern of transmission is at the golden membrane interface that is coated with the class of golden film " loudspeaker " spr sensor 8, there is SPR effect, the light wave of generation SPR effect exists with the form of surface plasma-wave, remaining light wave continues to propagate, through total reflection film 9 total reflections, again through clearance 7, at the golden membrane interface that is coated with the class of golden film " loudspeaker " spr sensor 8, there is SPR effect, the light that produces the resonance wavelength of SPR effect is exported by the photodetector 10 with time resolution characteristics and is received by the 2_2 port of 2 * 1 coupling mechanisms 4, photodetector 10 changes the light signal of gained into electric signal, the electric signal obtaining is through shaping, filtering, amplification is gathered by data collecting card (DAC) 11, the signal being gathered by data collecting card (DAC) 11 is input to PC 12 through line number according to the show and analyze.By side-polished fiber, clearance with to be coated with the optical fiber vibration sensing head that class " loudspeaker " spr sensor of golden film forms very responsive to the variation of clearance, increase along with clearance, the resonance wavelength that produces SPR effect is drifted about to shortwave, and the variable quantity of drift value and clearance has the good linearity.When there is vibration in external environment, act on the metallic film of the class that is coated with golden film " loudspeaker " spr sensor of optical fiber vibration sensing head, vibrate, cause the width of clearance to change along with the variation of vibration frequency, and then SPR spectrum is changed, by detecting the intensity at wavelength undetermined place, can realize supersensitive vibration survey.
The gordian technique that this device can be realized the ionization meter of the ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration has:
1, the structure of optical fiber vibration sensing head.By side-polished fiber, clearance with to be coated with the optical fiber vibration sensing head structure that class " loudspeaker " spr sensor of golden film forms be the basis of realizing ultra-sensitivity sensing.
2, the width of clearance.The resonance wavelength of SPR can be drifted about along with the thickness of clearance, when surpassing certain limit, the evanescent wave that is coupled to clearance cannot excite the free charge of metal inside and produce surface plasma-wave, therefore, side-polished fiber and the width that is coated with the clearance that class " loudspeaker " spr sensor of golden film forms should be strict controlled between 1nm～12nm.
3, the thickness of side-polished fiber residue covering.Along with reducing of cladding thickness, can make increasing core mode be coupled to clearance, if but covering is too thin, can cause occurring that pattern do not mate, and core mode is revealed completely, loss is too large; Very little, SPR coupling efficiency reduces the too thick pattern that causes being coupled to clearance, and the thickness that therefore remains covering should be controlled between 50nm～250nm.
4, be coated with thickness and the roughness of the sensing unit gold film of golden film.Gold film thickness can affect sharp-pointed degree and the extinction ratio of the resonance wavelength harmonic peak of SPR, the degree of roughness on gold film surface can affect the loss of surface plasma, and then affect the performance of SPR, therefore, the thickness of gold film should strictly be controlled between 40nm～70nm, and the root mean square of the roughness on golden film surface should be less than or equal to 5nm.
5, the metallic film of gold-plated film is very large on the measurement sensitivity impact of whole sensor, need to select the material that elasticity and flexible are good, and thickness is between 1mm～5mm.
6, the total reflection film of side-polished fiber is more than or equal to 90% to producing the P polarized light reflectivity of SPR effect, and this reflectance coating should be tried one's best smoothly simultaneously; Known according to surface plasma body resonant vibration theory, only have P polarized light ability excitating surface plasma ripple (SPW), therefore utilize Polarization Controller to guarantee that the flashlight of the side-polished fiber of input is complete P polarized light; The stability of light source is also the important sources of spr sensor error, should guarantee the stability of light source works.
In a specific embodiment of the present utility model, the optical fiber-coupled laser light source of Thorlabs, model S1FC635PM output wavelength 635nm; Optoisolator model is IO-2D-633-VLPa, and operation wavelength is 603-663nm, isolation between 35-40dB; Polarization Controller model is FPC022, and operation wavelength is 600-800nm; Side-polished fiber core diameter is 9 μ m, and the thickness of residue covering is 100nm, and axial length is 20 μ m; Gold film thickness is 50nm, and surfaceness root mean square is 3.7nm; The width of clearance is 5nm; Fiber selection is single-mode fiber G.652; The reflectivity of total reflection film is 95%; With the photodetector FDSP660 of tail optical fiber, single-mode fiber, operation wavelength is 610-770nm; Simultaneous data-acquisition KPCI-1818,8 channel parallel acquisition channels, sample frequency is 500KS/s, sampling resolution is 12; A multi-frequency generator; A loudspeaker.
Shown in the above and figure is only preferred implementation of the present utility model.Those of ordinary skill in the art, not departing under the prerequisite of principle of the present utility model, can also make some modification and improvement, and these also should be considered as belonging to protection domain of the present utility model.
Claims (1)
1. the ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration, comprises LASER Light Source, optoisolator, Polarization Controller, 2 * 1 coupling mechanisms, single-mode transmission optical fiber, Side polishing fiber single-mode fiber, clearance, be coated with class " loudspeaker " spr sensor of golden film, total reflection film, photodetector, data collecting card (DAC) and PC, is characterized in that:
The output terminal of LASER Light Source is connected with optoisolator, the output terminal of optoisolator is connected with Polarization Controller, one end of the two-port of 2 * 1 coupling mechanisms is connected with photodetector input end with the output terminal of Polarization Controller respectively, port one end for 2 * 1 coupling mechanisms is connected with one end of single-mode transmission optical fiber, the other end of single-mode transmission optical fiber is connected with the uncoated one end of Side polishing fiber single-mode fiber, class " loudspeaker " spr sensor and the Side polishing fiber single-mode fiber that are coated with golden film form clearance, the other end of Side polishing fiber single-mode fiber is coated with total reflection film, data collecting card (DAC) is connected with PC with photodetector output terminal respectively,
P polarized light is by LASER Light Source, optoisolator and Polarization Controller structure generation; By Side polishing fiber single-mode fiber, clearance and class " loudspeaker " spr sensor that is coated with golden film, form ultra-sensitivity optical fiber vibration sensing head, the thickness of Side polishing fiber single-mode fiber residue covering is between 50nm～250nm, the width of clearance is between 1～12nm, be coated with class " loudspeaker " spr sensor of golden film as SPR sensing unit, gold film thickness is between 40nm～70nm, the root mean square of surfaceness is less than or equal to 5nm, and the metallic film that is coated with golden film has good elasticity, pliability and thickness between 1mm～5mm; Total reflection film is more than or equal to 90% to the reflectivity of resonance wavelength; Photodetector, data collecting card and PC form signal demodulation part.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165684A (en) * | 2014-07-15 | 2014-11-26 | 中国计量学院 | Surface plasmon resonance-based supersensitive hydrophone |
| CN105277513A (en) * | 2015-11-05 | 2016-01-27 | 中国计量学院 | Surface plasmon resonance refraction index sensor based on optical fiber micro-rings |
| CN106840364A (en) * | 2017-04-07 | 2017-06-13 | 光子瑞利科技（北京）有限公司 | Reaction type optical fiber air based on Rayleigh scattering listens sound system |
| CN110132396A (en) * | 2019-04-29 | 2019-08-16 | 中国科学院光电技术研究所 | A kind of highly sensitive underwater sound wave detection device and method based on telescopic system |
-
2014
- 2014-07-15 CN CN201420396237.1U patent/CN203965028U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165684A (en) * | 2014-07-15 | 2014-11-26 | 中国计量学院 | Surface plasmon resonance-based supersensitive hydrophone |
| CN105277513A (en) * | 2015-11-05 | 2016-01-27 | 中国计量学院 | Surface plasmon resonance refraction index sensor based on optical fiber micro-rings |
| CN105277513B (en) * | 2015-11-05 | 2023-08-29 | 中国计量大学 | Surface plasma resonance refractive index sensor based on optical fiber micro-ring |
| CN106840364A (en) * | 2017-04-07 | 2017-06-13 | 光子瑞利科技（北京）有限公司 | Reaction type optical fiber air based on Rayleigh scattering listens sound system |
| CN110132396A (en) * | 2019-04-29 | 2019-08-16 | 中国科学院光电技术研究所 | A kind of highly sensitive underwater sound wave detection device and method based on telescopic system |
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