CN206804690U - A kind of highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system - Google Patents
A kind of highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system Download PDFInfo
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- CN206804690U CN206804690U CN201621141540.2U CN201621141540U CN206804690U CN 206804690 U CN206804690 U CN 206804690U CN 201621141540 U CN201621141540 U CN 201621141540U CN 206804690 U CN206804690 U CN 206804690U
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- acceleration
- sensor
- enhanced sensitivity
- highly sensitive
- optical fibre
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Abstract
The utility model discloses a kind of highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system, suitable for sensory field of optic fibre.The system uses the design on monochromatic light road, measurement to acceleration is realized by fiber interference principle, including light source, isolator, circulator, 50% 50% mirror lens of transmission, the speculum of polarization-maintaining sensor fibre, acceleration enhanced sensitivity and conversion sensor, reflectivity higher than 99%, photodetector and for demodulating the demodulation module of acceleration.The optical fiber used is all polarization maintaining optical fibre, can eliminate influence of the polarization state to interference.A kind of highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system can accurately measure the size of acceleration.The system has the advantages that simple in construction, high sensitivity, measurement dynamic range are wide, it is affected by environment to be not easy.
Description
Technical field
It the utility model is related to sensory field of optic fibre, and in particular to a kind of highly sensitive single polarization maintaining optical fibre interference formula accelerates
Sensor-based system is spent, the measurement to acceleration is realized by principle of optical interference.
Background technology
Accelerometer is a kind of important sensor.The method of traditional optical fiber measurement acceleration also has a lot, such as mikey
Your inferior interferometer mode, M-Z interferometer modes etc., its principle is that the light for sending light source is divided into two beams, a branch of by reference to arm, a branch of
By pickup arm, interference is produced after converging, into photodetector, after carrying out the processing such as photoelectric conversion, demodulates acceleration
Spend information.In this discrete light path, reference arm is not only influenced by temperature, also often in tested vibration environment, easily by
The influence of outside environmental elements, so as to influence the interference of light, decline the sensitivity of measurement.
Luo Zhi meetings et al. (a kind of single fiber Michelson interference sensor and sensor-based system, the patent No.：
201510278193.1) a kind of single fiber Michelson interference sensor and sensor-based system are reported, two chirp grating
Reflectivity is relatively low, causes measurement signal weak, is not suitable for long distance monitoring, using FBG gratings, can not eliminate polarization state to interference
Caused influence.Yao state treasure et al. (a kind of novel optical fiber vibration acceleration sensor simple in construction, the patent No.：
201510647965.4) a kind of novel optical fiber vibration acceleration sensor simple in construction is reported, its measurement sensitivity is low, essence
Spend low, be not suitable for high-precision vibration measurement field.
The content of the invention
The utility model purpose is to introduce a kind of highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system.Should
System uses the design on monochromatic light road, using principle of optical interference, realizes the measurement to acceleration.The system have it is simple in construction,
Reference arm not by influence of ambient vibration, high sensitivity, electromagnetism interference, it is corrosion-resistant, outstanding advantages of.
The utility model describes a kind of highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system, including light
It is source, isolator, circulator, 50% 50% mirror lens of transmission, polarization-maintaining sensor fibre, acceleration enhanced sensitivity and conversion sensor, anti-
Penetrate speculum and photodetector, demodulation module that rate is higher than 99%.Light source is connected with isolator, and a ports of circulator connect
Isolator, the b ports of circulator connect the lens of 50% transmission 50% reflection, and the c ports of circulator connect photodetector, and photoelectricity is visited
Device is surveyed to be connected with demodulation module.After 50% 50% mirror lens of transmission is connected with polarization-maintaining sensor fibre, by acceleration enhanced sensitivity and
Conversion sensor, then be connected with speculum of the reflectivity higher than 99%.
A kind of work of highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system of the utility model introduction is former
Reason is as follows：
The light that light source is sent is injected from a ports of circulator, projected from the b ports of circulator, reached by isolator
The lens of the reflection of 50% transmission 50%, split the light into two parts, and the 50% of light intensity is reflected, and the 50% of light intensity continues through lens
Propagate, by polarization-maintaining sensor fibre, acceleration enhanced sensitivity and conversion sensor, reach the speculum that reflectivity is higher than 99%, it is anti-
Mirror reflection is penetrated, after the transmission of the lens by the reflection of 50% transmission 50%, is interfered with the light of reflection from lens, then from annular
The c ports of device inject to photodetector, are demodulated into demodulation module.If the reflectance factor of two lens is respectively R1With
R2, the light intensity of laser is I0.Then the reflected light of first lens is I0*R1.Transmitted light is I0*(1-R1).Reach second reflection
During mirror, the light intensity of reflected signal is I0*(1-R1)*R2, reflected signal is I by the intensity after first lens0*(1-R1)2*
R2.Here it is the result of first reflection, can be two in view of incident light although first time two-way light intensity has certain difference
Being reflected and transmitted repeatedly between individual lens, so can constantly be added up with the light intensity of transmission per secondary reflection, enter limit by row
It can be found that the output intensity difference of incident intensity and polarization maintaining optical fibre is little after summation operation.And two-beam is through same light source
The light of transmitting, there is the identical direction of propagation and stable phase difference, therefore two-beam interference can be produced.
Acceleration enhanced sensitivity and conversion sensor have three kinds of different forms.Polarization maintaining optical fibre is wrapped on silica cartridge, such as Fig. 2
It is shown, the mass that quality is M is put on silica cartridge, forms paravariable column body formula acceleration enhanced sensitivity and conversion sensor.Light
Fibre is viscous on a cantilever beam, as shown in figure 3, one end of cantilever beam is fixed, the mass that a quality is M, group are put in another free end
Into beam type acceleration enhanced sensitivity and conversion sensor.Optical fiber is bonded on disc, as shown in figure 4, fixing a matter on disc
The mass for M is measured, forms disk type acceleration enhanced sensitivity and conversion sensor.
Compared with prior art, the utility model has the advantage of：
(1) the system is single light path design, compared with traditional double beam system, avoids reference arm easily by environment temperature
Degree and the influence of vibration, the interference of light will not be disturbed, and improve system output stability.
(2) optical fiber that system uses is polarization maintaining optical fibre entirely, can eliminate influence of the polarization state to interference.
(3) the system absorbs the advantages of three kinds of paravariable column body formula, beam type, disk type sensors, improves measurement
Sensitivity.
Brief description of the drawings
Fig. 1 is overall system diagram of the present utility model.
Fig. 2 is paravariable column body formula acceleration enhanced sensitivity and conversion sensor.
In figure：10 be the mass that quality is M, and 11 be optical fiber, and 12 be silica cartridge.
Fig. 3 is beam type acceleration enhanced sensitivity and conversion sensor.
In figure:13 be optical fiber, and 14 be the mass that quality is M, and 15 be cantilever beam.
Fig. 4 is disk type acceleration enhanced sensitivity and conversion sensor.
16 be mass of the quality for M in figure, and 17 be optical fiber, and 18 be disc.
Fig. 5 is the structural representation of the mass that quality is M, spring and spring damping.
19 be mass of the quality for M in figure, and 20 be spring, and 21 be spring damping.
Embodiment
1 to Fig. 5 the utility model is further elaborated below in conjunction with the accompanying drawings：
A kind of highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system, by light source 1, isolator 2, circulator 3,
Lens 4, polarization-maintaining sensor fibre 5, acceleration enhanced sensitivity and conversion sensor 6, the reflectivity of the reflection of 50% transmission 50% are higher than 99%
Speculum 7, photodetector 8, demodulation module 9 form.
A kind of overall index path of highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system is as shown in Figure 1.Light
The light that source is sent, by isolator, into a ports of circulator, exported from the b ports of circulator, by 50% transmission 50%
Lens, polarization-maintaining sensor fibre, acceleration enhanced sensitivity and the conversion sensor of reflection, reach the speculum that reflectivity is higher than 99%, quilt
Speculum reflects, and after the transmission of the lens by the reflection of 50% transmission 50%, is interfered with the light of reflection from lens, then from ring
Project the c ports of shape device.By photodetector, it is demodulated into demodulation module.
The light source of the system is distributed feedback laser (DFB), and centre wavelength is 1550nm narrow linewidth light sources.
The transmissivity and reflectivity of lens are respectively 50%, 50%.
The reflectivity of speculum is higher than 99%.
Used Transmission Fibers are all polarization maintaining optical fibres.
The interference signal that demodulation module detects to photodetector carries out the demodulation of phase, so as to demodulate acceleration.
In three kinds of sensors, when mass M vibrates, silica cartridge, cantilever beam or disc due are driven, constantly
Compression or stretching optical fiber, optical fiber is produced deformation, change light phase, so as to realize the measurement of acceleration.
Three kinds of acceleration enhanced sensitivities and conversion sensor can be equivalent to mechanical model as shown in Figure 5.
To mass M progress force analysis, in the vibration measurement applications below its intrinsic frequency, mass M displacement
X is with being that linear relationship x=η a, η are constant by measuring acceleration a.
For optical interference system, the relation of change and the displacement of phase is obtained, It is the change of phase
Change, λ is the wavelength of laser, and n is the refractive index of optical fiber.By two above formula, the change and acceleration of phase can be obtained
The relation of degree, bothSo the vibration acceleration to be measured can be reflected by the change of interference signal phase.
Claims (4)
- A kind of 1. highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system, it is characterised in that：By light source (1), isolation Device (2), circulator (3), lens (4), polarization-maintaining sensor fibre (5), acceleration enhanced sensitivity and the conversion of the reflection of 50% transmission 50% pass The speculum (7) of sensor (6), reflectivity higher than 99%, photodetector (8), demodulation module (9) composition, light source (1) are sent Light, by isolator (2), into a ports of circulator (3), exported from the b ports of circulator (3), by 50% transmission 50% Lens (4), polarization-maintaining sensor fibre (5), acceleration enhanced sensitivity and the conversion sensor (6) of reflection, reach reflectivity and be higher than 99% Speculum (7), reflected by speculum (7) of the reflectivity higher than 99%, the transmission of the lens (4) by the reflection of 50% transmission 50% Afterwards, the light with reflection from lens is interfered, and is then projected from the c ports of circulator (3), by photodetector (8), into solution Mode transfer block (9) is demodulated.
- 2. the highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system of one kind according to claim 1, its feature It is：The first form of the acceleration enhanced sensitivity and conversion sensor (6) be Optical Fiber Winding on silica cartridge, silica cartridge On put the mass that a quality is M, form paravariable column body formula acceleration enhanced sensitivity and conversion sensor.
- 3. the highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system of one kind according to claim 1, its feature It is：Second of form of the acceleration enhanced sensitivity and conversion sensor (6) is that optical fiber is viscous on a cantilever beam, one end of cantilever beam Fixed, the mass that a quality is M is put in another free end, forms beam type acceleration enhanced sensitivity and conversion sensor.
- 4. the highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system of one kind according to claim 1, its feature It is：The third form of the acceleration enhanced sensitivity and conversion sensor (6) is that optical fiber is bonded on disc, and one is fixed on disc Individual quality is M mass, forms disk type acceleration enhanced sensitivity and conversion sensor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621141540.2U CN206804690U (en) | 2016-10-20 | 2016-10-20 | A kind of highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621141540.2U CN206804690U (en) | 2016-10-20 | 2016-10-20 | A kind of highly sensitive single polarization maintaining optical fibre interference formula acceleration sensing system |
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| CN206804690U true CN206804690U (en) | 2017-12-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106680536A (en) * | 2016-10-20 | 2017-05-17 | 吉林大学 | High-sensitivity single polarization-maintaining fiber interference type acceleration speed sensing system |
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2016
- 2016-10-20 CN CN201621141540.2U patent/CN206804690U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106680536A (en) * | 2016-10-20 | 2017-05-17 | 吉林大学 | High-sensitivity single polarization-maintaining fiber interference type acceleration speed sensing system |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171226 Termination date: 20191020 |