CN102879082B - A kind of frequency of sound wave detector and multi-mode coupler frequency of sound wave detection system - Google Patents
A kind of frequency of sound wave detector and multi-mode coupler frequency of sound wave detection system Download PDFInfo
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- CN102879082B CN102879082B CN201210374356.2A CN201210374356A CN102879082B CN 102879082 B CN102879082 B CN 102879082B CN 201210374356 A CN201210374356 A CN 201210374356A CN 102879082 B CN102879082 B CN 102879082B
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Abstract
The present invention relates to a kind of frequency of sound wave detector and multi-mode coupler frequency of sound wave detection system.Frequency of sound wave detector comprises multi-module optical fiber coupler, aluminium matter film and derby, the diameter of aluminium matter circular membrane is 30 ~ 40mm, thickness is 2.5 ~ 3.5um, aluminium matter circular membrane surrounding is smooth to be pasted on described derby, the two ends of multi-module optical fiber coupler are fixed, and the coupled zone of middle long 5 ~ 10mm naturally droops and contacts with described aluminium matter film.Multi-mode coupler frequency of sound wave detection system comprises described frequency of sound wave detector, audio signal generator, loudspeaker, wide spectrum light source, 1 × 2 fiber coupler, high speed optoelectronic modular converter, spectrum analyzer.The present invention, compared with traditional condenser type detection method, utilizes optical fiber sound sensing mode, and antijamming capability is strong, is easy to long range propagation.
Description
Technical field
The present invention relates to a kind of frequency of sound wave detector and multi-mode coupler frequency of sound wave detection system.
Background technology
Frequency of sound wave detection is accurately very important in optical fiber communication and optical fiber sensing system.
The most frequently used frequency of sound wave detection means uses Electret Condencer Microphone, it has two pieces of metal polar plates, wherein one piece of surface scribbles electret film and by its ground connection, another pole plate is connected on the grid of field effect transistor, is connected to a diode between grid and source electrode.When being vibrated or be subject to the friction of air-flow, because vibration makes the distance between two-plate change, namely electric capacity changes, and electricity is constant, the change of voltage will be caused, the size of change in voltage, reflect the power of extraneous acoustic pressure, this change in voltage frequency reflects the frequency of external sound, the principle of work of Here it is Electret Condencer Microphone.Electret Condencer Microphone electroacoustic property is fine.But its moisture resistance is poor, and physical strength is low, price is slightly expensive, and uses slightly aobvious trouble.
Based on the novel device of optical fiber sound sensing technology because its volume is little, wide, the electromagnetism interference of dynamic range can work in the presence of a harsh environment, good stability and be easy to multiplexing etc. advantage and be subject to extensive concern.Optical fiber sound sensing technology can be summarised as three large method fields substantially: optical fibre device sonic transducer, fibre optic interferometer sonic transducer, fiber grating acoustic sensor.The stable performance of optical fibre device sonic transducer, but too rely on device performance, can only work in specific occasion.Such as 2004, the people such as R Chen proposed based on fused biconical taper monomode coupler ultrasonic sensor.This method measurement sensistivity can reach 5.6mV/Pa, and survey frequency scope is at 10kHz-1mHz; Fibre optic interferometer sonic transducer frequency sonding scope can reach 40Hz-400kHz, and sensitivity is higher, but easily causes phase error.Such as 2008, the people such as the Wu Dongfang of Fudan University did a series of research to Sagnac interference-type optical fiber microphone, and its experimental result display bandwidth reaches 10Hz-200kHz, and signal to noise ratio (S/N ratio) is up to more than 60dB; Fiber grating acoustic sensor is highly sensitive, good stability, but is only suitable for the high frequency sound signal of look-in frequency at more than 10kHz.Such as 2010, the people such as Hiroshi Tsuda carried out comparative study to the method that the bragg grating of several structure measures ultrasonic signal.
Summary of the invention
Technical matters to be solved by this invention be to provide a kind of look-in frequency scope wide, detect frequency of sound wave detector and multi-mode coupler frequency of sound wave detection system accurately.
For solving the problems of the technologies described above, the present invention provide firstly a kind of frequency of sound wave detector, it is characterized in that, comprise multi-module optical fiber coupler, aluminium matter film and derby, the diameter of described aluminium matter circular membrane is 30 ~ 40mm, thickness is 2.5 ~ 3.5um, described aluminium matter circular membrane surrounding is smooth to be pasted on described derby, and the two ends of described multi-module optical fiber coupler are fixed, and the coupled zone of middle long 5 ~ 10mm naturally droops and contacts with described aluminium matter film.
Based on above-mentioned frequency of sound wave detector, present invention also offers a kind of multi-mode coupler frequency of sound wave detection system, it is characterized in that, comprise described frequency of sound wave detector, also comprise audio signal generator, loudspeaker, wide spectrum light source, 1 × 2 fiber coupler, high speed optoelectronic modular converter, spectrum analyzer, described audio signal generator connects described loudspeaker, described loudspeaker are close to described frequency of sound wave detector, the output terminal of described frequency of sound wave detector connects described high speed optoelectronic modular converter, and described high speed optoelectronic modular converter connects described spectrum analyzer.
Further optimization, described multi-mode coupler frequency of sound wave detection system also comprises 1 × 2 fiber coupler, optics oscillograph, the output terminal of described frequency of sound wave detector connects described 1 × 2 fiber coupler, an output terminal of described 1 × 2 fiber coupler connects optics oscillograph, and another output terminal connects described high speed optoelectronic modular converter.
Preferably, in described multi-mode coupler frequency of sound wave detection system, the coupling ratio of described 1 × 2 fiber coupler is 50%, coupler input is connected by welding mode with multi-module optical fiber coupler, and two output terminals are docked by FC/APC fibre-optical splice with the connection of optics oscillograph and high speed optoelectronic modular converter respectively.
The coupling ratio approximate range of the multi-module optical fiber coupler of described un-encapsulated is at 20%-30%.
Beneficial effect of the present invention is:
1, the present invention is compared with traditional condenser type detection method, utilizes optical fiber sound sensing mode, and antijamming capability is strong, is easy to long range propagation;
2, the present invention is by the spectral image of spectrum analyzer tracking signal, utilizes optics oscillograph to carry out the time domain waveform of detectable signal simultaneously, ensure that the accuracy of measurement.
3, sensing head of the present invention is the multi-module optical fiber coupler utilizing fused biconical taper technique to make, and cost is low, is easy to quick production in enormous quantities.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is further described in detail.
Fig. 1 is multi-mode coupler frequency of sound wave detection system structural drawing of the present invention;
Fig. 2 is the structural drawing of frequency of sound wave detector of the present invention;
Fig. 3 is multi-mode coupler preparation technology structural drawing of the present invention.
Embodiment
Fig. 1 gives multi-mode coupler frequency of sound wave detection system structural drawing, and virtual instrument software audio signal generator 4 sends specific single-frequency acoustic signals by connecting loudspeaker 5.Wide spectrum light source 1 connects frequency of sound wave detector 2 by general single mode fiber, and when characteristic frequency acoustic signals acts on frequency of sound wave detector, cause frequency of sound wave detector resonance, frequency of sound wave signal is converted into the change of light signal.The output terminal of frequency of sound wave detector connects an output terminal connection optics oscillograph 8 of 1 × 2 fiber coupler 3,1 × 2 fiber coupler 3, and real-time dynamic scan is by the time domain fluctuation of the light signal of frequency of sound wave detector.Another output terminal of 1 × 2 fiber coupler 3 connects after high speed optoelectronic modular converter 6 changes into electric signal and accesses in spectrum analyzer 7, the frequency domain spectra shape of display frequency detector resonance, thus demodulates the frequency of sound wave acted on frequency of sound wave detector 2.Optics oscillograph 8 output time-domain signal, time-domain signal gained signal after Fourier transform contrasts with the frequency-region signal on spectrum analyzer 7, ensures the accuracy of demodulation frequency of sound wave.
In Fig. 1,1 × 2 fiber coupler 3 is general single mode fiber coupling mechanism, and its splitting ratio is 50:50.
Fig. 2 gives the structural drawing of the frequency of sound wave detector 2 used by detection system, and it is made up of the multi-module optical fiber coupler 9 of un-encapsulated, aluminium matter film 10 and support metal block 11.The coupling ratio of multi-module optical fiber coupler 9 is about 20%-30%, and its two ends are fixed, and centre naturally droops, and only length is that the coupled zone of 5 ~ 10mm contacts with aluminium matter film 10.Aluminium matter film 10 is the circular membrane of diameter 30 ~ 40mm, thick 2.5 ~ 3.5um, and what surrounding was smooth is pasted on support metal block 11, and support metal block 11 is ring-like, and internal diameter is slightly less than the diameter of aluminium matter circular membrane, thick about 20mm.Sound wave effect causes the resonance of aluminium matter film 10 on aluminium matter film 10, drive the corresponding vibration of the multi-module optical fiber coupler coupled zone be positioned over above film, thus make Coupling power than occurring and the change of sound wave same frequency, so just achieve frequency of sound wave based on intensity modulation to the conversion of frequency of light wave.
Fig. 3 gives multi-mode coupler preparation technology structural drawing, 1550nm single wavelength light source 12 connects general single mode fiber Output of laser, general single mode fiber connects one section of multimode optical fiber 14 by welding mode, multimode optical fiber 14 is placement parallel with another root multimode fiber again, zone line is about 25mm and is all divested coat, then the two ends knotting of part is divested, multimode optical fiber is fixed in fixture 13 and fixture 15 respectively to two ends, and fixture 15 multimode optical fiber is out connected to detector 16 and detector 17 respectively by naked fine adapter again.Detector 16,17 is connected to computer 18, the coupling power information detected is passed to computer 18, computer 18 controls the operation of fixture by the driving circuit of electric wire jockey 13, fixture 15 again, and computer 18 connects hydrogen duration and degree of heating 19 simultaneously, controls the motion of duration and degree of heating.When computer 18 control duration and degree of heating 19 move to hydrogen flame envelope heating multimode optical fiber to 14 time, symmetrical disengaging movement while starting to control fixture 13, fixture 15, multimode optical fiber is realized limit heating edge to 14 stretch, thus realize multimode optical fiber to 14 power cross-couplings, stop drawing cone when reaching predetermined splitting ratio, so just carried out the preparation of multi-module optical fiber coupler 9.
In Fig. 3, multimode optical fiber is the known multimode optical fiber of refractive index to 14, and its core diameter is 105um, cladding diameter 125um.Hydrogen duration and degree of heating 19 supplies hydrogen by hydrogen generator brine electrolysis and controls its hydrogen flowing quantity size.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (5)
1. a frequency of sound wave detector, it is characterized in that, comprising coupling ratio is 20%-30% multi-module optical fiber coupler, aluminium matter circular membrane and loop type metal block, the diameter of described aluminium matter circular membrane is 30 ~ 40mm, thickness is 2.5 ~ 3.5 μm, described aluminium matter circular membrane surrounding is smooth to be pasted on described derby, the two ends of described multi-module optical fiber coupler are fixed, and the coupled zone of middle long 5 ~ 10mm naturally droops and contacts with described aluminium matter circular membrane.
2. a multi-mode coupler frequency of sound wave detection system, it is characterized in that, comprise frequency of sound wave detector described in claim 1, also comprise audio signal generator, loudspeaker, wide spectrum light source, 1 × 2 fiber coupler, high speed optoelectronic modular converter, spectrum analyzer, described audio signal generator connects described loudspeaker, described loudspeaker are close to described frequency of sound wave detector, the output terminal of described frequency of sound wave detector connects described high speed optoelectronic modular converter, and described high speed optoelectronic modular converter connects described spectrum analyzer.
3. multi-mode coupler frequency of sound wave detection system according to claim 2, it is characterized in that, also comprise optics oscillograph, the output terminal of described frequency of sound wave detector connects described 1 × 2 fiber coupler, an output terminal of described 1 × 2 fiber coupler connects optics oscillograph, and another output terminal connects described high speed optoelectronic modular converter.
4. multi-mode coupler frequency of sound wave detection system according to claim 3, it is characterized in that, the coupling ratio of described 1 × 2 fiber coupler is 50%, 1 × 2 fiber coupler input end is connected by welding mode with multi-module optical fiber coupler, and two output terminals are docked by FC/APC fibre-optical splice with the connection of optics oscillograph and high speed optoelectronic modular converter respectively.
5. multi-mode coupler frequency of sound wave detection system according to claim 4, is characterized in that, the coupling ratio scope of the described multi-module optical fiber coupler of un-encapsulated is at 20%-30%.
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