CN110057439A - A kind of low quick sensing device of resonance eccentric core fiber sound based on F-P interference - Google Patents
A kind of low quick sensing device of resonance eccentric core fiber sound based on F-P interference Download PDFInfo
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- CN110057439A CN110057439A CN201910400856.0A CN201910400856A CN110057439A CN 110057439 A CN110057439 A CN 110057439A CN 201910400856 A CN201910400856 A CN 201910400856A CN 110057439 A CN110057439 A CN 110057439A
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- eccentric core
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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 low quick sensing device of resonance eccentric core fiber sound based on F-P interference, including the following contents: the laser that tunable laser issues is divided into two-way after fiber coupler, directly acquisition is used as reference light all the way, another way turns eccentric core fiber module through optical fiber circulator and single mode optical fiber and enters the quick sensing head of eccentric core fiber sound, and the light of reflection enters another way photoelectric conversion module through optical fiber circulator.The quick sensing head of eccentric core fiber sound is to plate transparent organic molecular film and double layer of metal film in eccentric core fiber end face by coating technique to form F-P resonant cavity, and F-P interference, which occurs, in optical fiber front end using light can convert modulated optical signal for voice signal.After photoelectric conversion module and amplification module, acquires and handle this signal to restore the acoustical signal of optical fiber end.Resonance is greatly reduced in the design of eccentric core fiber, reduces remained shock noise.The configuration of the present invention is simple, good reliability have higher sensibility and signal-to-noise ratio than conventional fiber optic sensors, are with a wide range of applications.
Description
(1) technical field
The present invention relates to a kind of low quick sensing devices of resonance eccentric core fiber sound based on F-P interference, specifically utilize F-P optics
Interference can obtain low resonance high-precision and the inspection of high-resolution pressure signal to design and produce eccentric core fiber acoustic sensor
It surveys.
(2) background technique
Sonic detection technology is a kind of velocity of wave, frequency and amplitude variations by detecting the echo that sound wave reflects in the medium
Understand the technology of media interior information, it can detect organism or raw material under nondestructive state, be widely applied
In fields such as biomedicine, aerospaces.The key of sonic detection technology is acoustic sensor, but so far, traditional sound
The disadvantages of dependent sensor generally uses piezoelectric material to acquire vibration information, and there is such as sensitivity is low and Bandwidth-Constrained.Interference
Type optical fiber acoustic sensor measures the amplitude-frequency characteristic of acoustic signals by the interference between light beam, is developed in recent years
A kind of novel acoustic sensor, it is acoustic sensor that it has many advantages, such as, and anti-electromagnetic interference capability is strong, small in size, high sensitivity
One important research direction.According to principle difference, interference-type optical fiber acoustic sensor can be divided into Michelson interference-type,
The optical fiber acoustic sensors such as Mach-Zehnder interference-type, Sagnac interference-type and F-P interference-type.Michelson interference-type
Optical fiber acoustic sensor is relatively simple for structure, but due to being influenced when light transmits interference in multi-channel optical fibre vulnerable to extraneous factor,
Which has limited its precision and application environments.Mach-Zehnder interference-type optical fiber acoustic sensor has biggish detection bandwidth,
But it there is the disadvantage of stability difference.Sagnac interference-type optical fiber acoustic sensor stability with higher, but its
It is generally used for the measurement of angular speed, application scenarios are relatively more limited.Optical fiber based on F-P interference in interference-type acoustic sensor
Acoustic sensor because with precision is high, size is small and stability is high due to have attracted much attention, but there are stronger humorous for this sensor
Vibration and it is longer echo the duration, this frequently can lead to biggish noise.In order to overcome this disadvantage, the present invention is based on F-
P interference effect proposes a kind of eccentric core fiber acoustic sensor, and this novel optical fiber acoustic sensor is low humorous as the result is shown
Precision with higher and signal-to-noise ratio under vibration.
(3) summary of the invention
Present invention mainly solves the problem of be to provide a kind of low quick sensing device of resonance eccentric core fiber sound, using fiber optic tip
The method of plated film designs F-P resonant cavity, forms presser sensor end face, and when extraneous acoustic pressure converts, chamber is long generates change therewith
Change, the reflection signal that F-P interference generates changes, it may be possible to obtain very high measurement accuracy.The bias of fiber core is set
The resonance that can reduce fiber optic tip is set, realizes that sensing head reduces making an uproar for generation of echoing on the basis of not reducing measurement accuracy
Sound.
For solve optical fiber acoustic sensor resonance problems, the technical solution adopted by the present invention is that: a kind of optical fiber sound is provided
Quick sensing device, comprising: tunable laser module, fiber coupler, optical fiber circulator, the quick sensing head of eccentric core fiber sound, light
Electric conversion module, amplifier module and signal processing unit.The light that the tunable laser issues passes through after fiber coupler
It is divided into two-way, a routing optical fiber circulator first port enters, and is output to single mode optical fiber from optical fiber circulator second port and turns inclined
Heart optic module, then enters the quick sensing head of eccentric core fiber sound by eccentric core fiber again, and another way is directly entered photoelectric conversion
Module is converted to electric signal as intensity contrast signal.Light enter after the quick sensing head of optical fiber sound can be formed in double layer of metal film it is humorous
F-P interference is generated in vibration chamber, then passes the light after interference back eccentric core fiber again.When voice transmission to the quick biography of eccentric core fiber sound
Metal film can be caused to shake when feeling head, cause F-P interference to generate variation, and then the light intensity being reflected into eccentric core fiber is caused to occur
Variation.The light being reflected back from eccentric core fiber turns eccentric core fiber module through single mode optical fiber and enters optical fiber circulator second port,
Then photoelectric conversion module is output to by third port.The electric signal of two-way photoelectric conversion module output passes after amplifier amplifies
To acquisition and signal processing unit, and then the achievable demodulation to voice signal.
The core of the quick sensing device of eccentric core fiber sound is the quick sensing head of eccentric core fiber sound being made of F-P cavity, sensing
Head is the F-P resonant cavity of fiber optic tip, is made of double layer of metal film and intermediate one layer of organic high molecular layer.Metal film has higher
Reflectivity and the light transmittance of organic high molecular layer is higher.The chamber that resonant cavity can be changed when voice transmission is to resonant cavity is long, and light exists
The reflection of resonant cavity can change therewith and then complete the measurement to acoustic pressure.
Preferably, the thickness that organic molecular film is determined according to the wavelength of interference light can be distinguished according to reflection and transmissivity
Determine the thickness of double layer of metal film；
Preferably, according to the actual (real) thickness of organic molecular film in eccentric core fiber acoustic sensor, tunable laser it is defeated
Wavelength out, until wavelength is in reflectivity on the greatest gradient of thickness change, sensor has maximum sensitivity at this time；
Preferably, according to minimum remained shock amplitude and time, it can determine that the radius of eccentric core fiber and fibre core are several to optical fiber
The distance at what center.
The beneficial effects of the present invention are: being double layer of metal film and intervening organic molecules film group by design eccentric core fiber front end
At F-P cavity, can achieve very high measurement accuracy, fibre core eccentric place in covering can be effectively reduced remained shock, and then make
Make highly sensitive broadband acoustic sensor.
(4) Detailed description of the invention
Fig. 1 is a kind of quick sensing device light path schematic diagram of eccentric core fiber sound of the present invention.
Fig. 2 is the eccentric core fiber acoustic sensor structural schematic diagram interfered based on F-P.
Fig. 3 is eccentric core fiber cross-sectional view.
In Fig. 1: 1- tunable laser module；2- fiber coupler；3- optical fiber circulator；4- single mode optical fiber turns eccentric light
Fiber module；5- eccentric core fiber；The quick sensing head of 6- eccentric core fiber sound；7 photoelectric conversion module A；8- photoelectric conversion module B；9- amplification
Device modules A；10- amplifier module B；11- Signal acquiring and processing unit.
In Fig. 2: 12- fiber core；13- fibre cladding；14- metal film A；15- organic high molecular layer；16- metal film B.
In Fig. 3: R1 is the radius of eccentric core fiber；R2 is inner core radius；R is inner core to fiber optic hub distance.
(5) specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is the quick sensing device light path schematic diagram of eccentric core fiber sound in the present embodiment shown in Fig. 1.The eccentric core fiber of the present embodiment
The quick sensing device of sound includes that tunable laser module 1, fiber coupler 2, optical fiber circulator 3, single mode optical fiber turn eccentric core fiber
The quick sensing head 6 of module 4, eccentric core fiber sound, eccentric core fiber 5, photoelectric conversion module 7 and 8, amplifier module 9 and 10 and signal are adopted
Collection and processing unit 11.It is based on the eccentric core fiber acoustic sensor of F-P interference shown in Fig. 2, basic structure is one by three
The F-P interferometer that tunic is constituted, for acoustic pressure to be converted to the light intensity signal of reflection.
The present invention will be further described below with reference to the drawings:
Step 1, the light that tunable laser 1 issues are divided into two-way by fiber coupler 2, pass through optical fiber circulator 3 all the way
First port enters, and is output to single mode optical fiber from optical fiber circulator second port and turns eccentric core fiber module 4, then passes through bias again
Optical fiber 5 enters optical fiber acoustic sensor 6；
Step 2, light enter the resonant cavity that can be formed between metal film A and metal film B after the quick sensing head of eccentric core fiber sound
Middle generation F-P interference, then turns eccentric core fiber module through single mode optical fiber again for the light after interference and passes eccentric core fiber back；
Step 3 is chosen the laser of tunable wave length for carrying out interference experiment research, is guaranteed by continuous scanning
Light intensity is at greatest gradient with the variation of resonant cavity thickness；
Step 4 can cause metal film to shake, cause F-P resonant cavity thickness when voice transmission is to optical fiber acoustic sensor
Variation, in turn result in the light intensity being reflected into eccentric core fiber and change；
Step 5, the another way light separated from fiber coupler 2 enters photoelectric conversion module 7, then through amplifier module 9
Entering signal acquisition and processing unit；
Step 6, from the light being reflected back in eccentric core fiber by optical fiber circulator after single mode optical fiber turns eccentric core fiber module
Two-port netwerk, which enters from third port, is output to photoelectric conversion module 8, is then transmitted to signal acquisition after the amplification of amplifier module 10
With processing unit 11, and then the achievable demodulation to voice signal.
The experimental results showed that the remained shock that eccentric core fiber sensor measures is lower, the duration of echoing is small, survey with higher
Accuracy of measurement and lesser noise.
Above to the description of the present invention and embodiments thereof, it is not limited to which this, is only reality of the invention shown in attached drawing
Apply one of mode.Without departing from the spirit of the invention, it without creating designs similar with the technical solution
Structure or embodiment, the category scope of the present invention.
Claims (5)
1. a kind of low quick sensing device of resonance eccentric core fiber sound based on F-P interference, which includes: tunable sharp
Light device module, fiber coupler, optical fiber circulator, single mode optical fiber turn eccentric core fiber module, eccentric core fiber sensing head, photoelectric conversion
Module, amplifier module and Signal acquiring and processing unit, the fiber coupler first port and optical fiber circulator are tunable
Laser connection, second port are connect with optical fiber circulator first port, and third port is connect with photoelectric conversion module；Fiber optic loop
The second port of shape device and single mode optical fiber turn the second port that eccentric core fiber module is connect and connect with the spectra collection module
Third port.
2. tunable laser module according to claim 1, it is characterised in that generated optical maser wavelength is adjustable, according to
Demand is changed to need wavelength.
3. optical fiber circulator according to claim 1, it is characterised in that light enters second port output resistance from first port
Anti- very little enters third port output impedance also very little from second port, but exports from third port input from first port
Impedance is very high.
4. the quick sensing head of eccentric core fiber sound according to claim 1, it is characterised in that: the sensing head includes eccentric light
The organic high molecular layer of the layer of transparent of fine and end face plating and the metal film of two layers of part reflection, polymeric membrane is with a thickness of 2-50 μ
M, double layer of metal film thickness are 10-200nm, and the F-P cavity presser sensor structure for forming certain resonance to carry out high-precision to acoustic pressure
Measurement.
5. eccentric core fiber according to claim 2, it is characterised in that: the eccentric core fiber includes amesiality optical fiber
Fibre core and fibre cladding.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110553715A (en) * | 2019-09-09 | 2019-12-10 | 北京航空航天大学 | Optical fiber array type sound wave signal acquisition device based on laser interference |
| CN111998884A (en) * | 2020-07-14 | 2020-11-27 | 重庆邮电大学 | Wavelength self-calibration optical fiber FP sensor demodulation method |
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| CN111998884A (en) * | 2020-07-14 | 2020-11-27 | 重庆邮电大学 | Wavelength self-calibration optical fiber FP sensor demodulation method |
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Application publication date: 20190726 |