CN100357742C - Acceleration sensor - Google Patents
Acceleration sensor Download PDFInfo
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- CN100357742C CN100357742C CNB2005100264528A CN200510026452A CN100357742C CN 100357742 C CN100357742 C CN 100357742C CN B2005100264528 A CNB2005100264528 A CN B2005100264528A CN 200510026452 A CN200510026452 A CN 200510026452A CN 100357742 C CN100357742 C CN 100357742C
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- 230000001133 acceleration Effects 0.000 title claims abstract description 55
- 239000013307 optical fiber Substances 0.000 claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 239000003292 glue Substances 0.000 claims abstract description 5
- 239000000835 fiber Substances 0.000 claims description 118
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- 238000005259 measurement Methods 0.000 description 4
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- 238000006073 displacement reaction Methods 0.000 description 3
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Abstract
An acceleration sensor, comprising: the weight is fixed in the middle of the first optical fiber section, two ends of the first optical fiber section and the second optical fiber section are respectively connected with the first optical fiber coupler and the second optical fiber coupler to form an unbalanced Mach-Zehnder interferometer, and the first optical fiber section and the second optical fiber section are fixed on the first support and the second support of the base through bonding glue; a broadband light source is connected with the input end of the unbalanced Mach-Zehnder interferometer; the output end of the unbalanced Mach-Zehnder interferometer is connected with a signal processing circuit module through a detector of optical signals.
Description
Technical field
The present invention relates to acceleration transducer, particularly a kind of acceleration transducer based on the fiber optic interferometric principle.Acceleration transducer of the present invention is a kind of sensor of small acceleration, be mainly used in the buildings such as high building, bridge, high tower, rocking and deformation of measurement perceptual structure by small acceleration is as a kind of real-time monitoring technique of construction work and a kind of means of buildings health detection; Also can be applicable to transport the acceleration detection of other structures such as utensil and mechanical hook-up.
Background technology
Building need be monitored the various mechanics parameters and the material parameter of engineering in real time at construction period.After building is built up and come into operation, also need its state is carried out many-sided regular detection.Building, as high building, bridge, high tower etc., rocking under environmental baselines such as various meteorologies and geology is the phenomenon of an outwardness.This situation of rocking is the important parameter of reflection buildings health status.Absolute displacement when building rocks is a parameter that is difficult to directly measure.But when rocking, will inevitably bring certain acceleration, just can extrapolate the state that buildings rocks by the measurement of acceleration.In general, the shaking amplitude of building may be very big, but relatively slowly.Therefore this is the task of measuring small acceleration.In large-scale carrier and various mechanical hook-up, the detection of acceleration also is the important measures of equipment operation and safety guarantee.
One of acceleration analysis common method is the method for machinery.The measurement acceleration causes the relative motion of fork, just can calculate acceleration.Two of common method is electronics method or microelectronic component method.It generally is the acceleration that the variation by the electric capacity between conductive reed and the fixed electorde comes detecting sensor to stand.Electronics method is comparative maturity.But it also has some difficulty that is difficult to overcome.Such as in the strong-electromagnetic field environment, it can be subjected to big interference, and reliability is measured in influence.It also may be subjected to the influence of environment steam.Therefore people also attach great importance to develop and have the optical means of good anti-electromagnetic interference capability.In optical means, Fibre Optical Sensor is the technology that has practicality most.Formerly one of technology is to utilize the emergent property of fiber grating transmission spectrum.In this acceleration transducer, there is a weight to be fixed on the fiber grating, the inertial force that acceleration causes acts on the fiber grating, causes the strain of optical fiber, as shown in Figure 1.The fiber grating peak wavelength is Δ λ with the fundamental relation of strain variation
B/ λ
B=(1-γ) ε, ε is the strain of optical fiber in the formula, γ is the elasto-optical coefficient of fiber optic materials.The peak wavelength of measuring optical fiber optical grating reflection spectrum just can the suffered stress and the acceleration that is stood of perception.This technology is suitable for bigger acceleration analysis.For small acceleration, the peak wavelength amount of movement is too little, and the sensitivity of detection can not meet the demands.Formerly two of technology is to utilize fibre optic interferometer.In this accelerometer, weight can be fixed on the interference arm of an optical fiber equally.Be subjected to the effect of the inertial force of acceleration generation, interfere the optical path difference of two arms to change, just can measure the acceleration that is stood.It has highly sensitive advantage.But because interference signal is the cycle with 2 π, interference signal can not be differentiated the phase differential that surpasses 2 π integral multiples.Therefore must adopt certain phase unwrapping to calculate.
Fig. 2 is Mach-Zehnder interferometer (M-Z) structure that adopts 2 * 2 fiber couplers to constitute.According to the Mach-Zehnder interference effect, the output power of two output ports can be expressed as:
I
1＝I
0[1+cos(2πnΔL/λ)]/2
I
2＝I
0[1-cos(2πnΔL/λ)]/2
I in the formula
0Be the input light intensity; N is the effective refractive index of optical fiber; Δ L is the optical path difference of interferometer two arms.This transport property can be expressed as the curve of Fig. 3.As seen from the figure, when phase differential =when 2 π n Δ L/ λ reached the integral multiple of π, it is very big or minimum that two output signals reach respectively.The sensitivity that this moment, interference signal changed with phase differential is reduced to zero.And on this a series of zero crossing, the direction that phase differential changes is to increase or reduce, and just can not differentiate from the increase and decrease of interference signal.So, phase differential surpasses the calculating behind the π, just can not add up.Therefore the range of its measurement and sensing also just can only be limited to the phase differential that is less than or equal to π.
Therefore developing a kind of existing high sensitivity, can obtain the acceleration transducer of the novel interferometer type of wide range information again by phase unwrapping, is the demand of practical application.
Summary of the invention
Do not have the problems referred to above of solving at technology formerly, the present invention proposes the interferometer type acceleration transducer that a kind of 3x3 of employing fiber coupler constitutes.
Technical solution of the present invention is as follows:
A kind of acceleration transducer, feature is its formation: a pouring weight is fixed in the middle of first fiber segment, the two ends of this first fiber segment and second fiber segment are connected to form a non-equilibrium Mach-Zehnder interferometer with first fiber coupler and second fiber coupler respectively, and described first fiber segment and second fiber segment are fixed on first bearing and second bearing of base with adhesive glue; One wideband light source links to each other with the input end of described non-equilibrium Mach-Zehnder interferometer; This non-equilibrium Mach-Zehnder interferometer output terminal links to each other with the signal processing circuit module through the detector of light signal.
Described first fiber coupler and second fiber coupler are 3 * 3 fiber couplers.
Described first fiber coupler is 2 * 2 fiber couplers, and second fiber coupler is 3 * 3 fiber couplers, and three output terminals of described second fiber coupler link to each other with the signal processing circuit module through the detector through three road light signals.
Described first fiber coupler is 3 * 3 fiber couplers, and second fiber coupler is 2 * 2 fiber couplers, two free ends of this second fiber coupler are connected to each other, constitute a fiber loop mirror, described first fiber coupler is 3 * 3 fiber couplers, in three ports of each of these coupling mechanism both sides, two ports on right side connect two arms of Mach-Zehnder interferometer, and a port in left side connects wideband light source; Two ports connect the two paths of signals processing circuit module through detector respectively in addition.
Described non-equilibrium Mach-Zehnder interferometer is a two-dimentional non-equilibrium Mach-Zehnder interferometer, one pouring weight is fixed on first fiber segment, the two ends of this first fiber segment and second fiber segment are connected to form outside the non-equilibrium Mach-Zehnder interferometer of level with first fiber coupler and second fiber coupler respectively, also have the 3rd fiber segment and the 4th fiber segment fiber segment for two arms of the Mach-Zehnder interferometer of formation vertical direction, mass is fixed on first fiber segment and the 3rd fiber segment simultaneously.
Described non-equilibrium Mach-Zehnder interferometer is a three-dimensional non-equilibrium Mach-Zehnder interferometer.
The advantage of acceleration transducer of the present invention is:
(1) the present invention has high sensitivity.Interferometer is one of wavelength magnitude, the percentage of wavelength, the subtle change of per mille magnitude of perception two arm optical path differences obviously, therefore has very high sensitivity.
(2) the present invention adopts 3 * 3 fiber couplers to constitute interferometer, and not having sensitivity in measuring the very wide spectral range of sensing is zero " dead band ".
(3) the present invention can judge the direction of phase change by the processing of the light signal of three output ports of 3 * 3 interferometers.Thereby can adopt the computing method of phase unwrapping (Phase Unwrapping), the range of sensing is measured in expansion greatly.
(4) employed components and parts of the present invention are all ripe, and existing supply of commodities, and are therefore with low cost, help applying.
Description of drawings
Fig. 1 is existing grating type optical fiber acceleration transducer
Fig. 2 is existing Mach-Zehnder interferometer type acceleration transducer
Fig. 3 is the transport property of the M-Z interferometer that constitutes of 2 * 2 coupling mechanisms shown in Figure 2
Fig. 4 is the one dimension acceleration sensor structure sketch that embodiment of the invention 1-3 * 3 coupling mechanisms constitute
Fig. 5 is the transport property of the M-Z interferometer of the present invention's 3 * 3 coupling mechanisms formation
Fig. 6 is the acceleration transducer of embodiment of the invention 2-two dimension response
Fig. 7 is the acceleration transducer of the three-dimensional response of embodiment of the invention 3-
Fig. 8 is the acceleration transducer of embodiment of the invention 4-by the M-Z interferometer type of 3 * 3 and 2 * 2 coupling mechanisms formation
Fig. 9 is the acceleration sensor structure synoptic diagram that embodiment of the invention 5-one end adopts the Michelson interferometer of fiber loop mirror to form
Figure 10 is the acceleration transducer that embodiment of the invention 6-is equipped with the amplitude seat
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing.
See also Fig. 4 earlier, as seen from the figure, the formation of acceleration transducer of the present invention comprises:
One pouring weight 1 is fixed on first fiber segment 11, the two ends of this first fiber segment 11 and second fiber segment 12 are connected to form a non-equilibrium Mach-Zehnder interferometer with first fiber coupler 21 and second fiber coupler 22 respectively, described first fiber segment 11 and second fiber segment, 12 usefulness adhesive glue 3 are fixed on first bearing 41 and second bearing 42 of base 4, and the length of described first fiber segment 11 and second fiber segment 12 is respectively L
1And L
2, the optical path difference between them is n Δ L=n (L
1-L
2). One wideband light source 7 links to each other with the input end of described non-equilibrium Mach-Zehnder interferometer; This non-equilibrium Mach-Zehnder interferometer output terminal links to each other with signal processing circuit module 82 through the detector 81 of light signal.Described first fiber coupler 21 and second fiber coupler 22 are the 3x3 fiber coupler.
The principle of work of acceleration transducer of the present invention is as follows: the quality of establishing pouring weight 1 is m, is a by the acceleration of the buildings of sensing and object, and then the inertial force on pouring weight is ma.Under the effect of this inertial force, the part generation tensile strain of first fiber segment 11 between two adhesive glue 3.If the distance of first fiber segment 11 between bonding point is l, pouring weight 1 is fixed on the mid point of first fiber segment 11, the yardstick of supposing pouring weight 1 is much smaller than optical fiber span length l, can derive according to stress analysis and elastic deformation principle, under the effect of gravity mg and inertial force ma, the variable quantity of this length is:
δl＝2m
2(2g+a)al/E
2
This amount also equals to cause the variation δ (Δ L) of two arm optical path differences of interference signal.
The mathematical notation formula of the output signal of the non-equilibrium Mach-Zehnder interferometer that is made of two 3 * 3 fiber couplers can derive out according to the ultimate principle of fiber optics, is written as:
I
1＝(I
0/3)[1+cos(φ-2π/3)]
I
2＝(I
0/3)[1+cos(φ)]
I
3＝(I
0/3)[1+cos(φ+2π/3)]
As shown in Figure 5.Because the variation of interferometer optical path difference will cause the variation of three output port light signals.The spectral characteristic of three output light signals all is a cosine curve, and is identical with the curve of Fig. 3.But three there is 120 ° phasic difference between the curve.This just provides following crucial character:
The first, three output signal can not drop to zero simultaneously for the sensitivity of spectrum change.That the output of a certain road reaches is very big or minimum, when derivative is zero, the signal of two-way is in the interval that changes the slope maximum in addition.Therefore in the overall optical spectral limit, can obtain high response.
The second,,, phasic difference reaches that π, a certain road light signal reach extreme value and can not judge the direction that phase differential further changes the time, two ways of optical signals can provide clear and definite judgement in addition when changing because first characteristic.Utilize this character, when measured variation makes the phasic difference variation reach the integral multiple of π, still can pass through the computing method of phase unwrapping (Phase Unwrapping), obtain the definite information of measured variation.Therefore the scope of measuring sensing in principle can be expanded widely.
Initial light path difference Δ L when three, the period of change of Fig. 3 curve is decided by that this non-equilibrium Mach-Zehnder interferometer is set up.Δ L is big more, and the spectrum change cycle is more little.The spectrum change cycle is little, and light signal is high more for the sensitivity of measured variation.But the range in one-period is more little, and the workload that need carry out phase unwrapping calculating is big more.
Acceleration transducer of the present invention shown in Figure 4 is an one dimension acceleration transducer.It can expand to the acceleration transducer of two and three dimensions.
Fig. 6 is two dimension acceleration sensor of embodiment of the invention 2-.Described non-equilibrium Mach-Zehnder interferometer is a two-dimentional non-equilibrium Mach-Zehnder interferometer, one pouring weight 1 is fixed on first fiber segment 11, the two ends of this first fiber segment 11 and second fiber segment 12 are connected to form outside the non-equilibrium Mach-Zehnder interferometer of level with first fiber coupler 21 and second fiber coupler 22 respectively, also has the 3rd fiber segment and the 4th fiber segment fiber segment for two arms of the Mach-Zehnder interferometer of formation vertical direction, mass 1 is fixed on first fiber segment 11 and the 3rd fiber segment simultaneously, when mass 1 is subjected to gravity and inertial force effect and during displacement, first fiber segment 11 and the 3rd fiber segment generation tensile strain, just can pass through the one 3 * 3 fiber coupler 21 and the 23 * 3 fiber coupler 22, non-equilibrium horse-Zehnder interferometer that the 33 * 3 fiber coupler 23 and the 43 * 3 fiber coupler 24 constitute, measure the variable signal of interfering, calculate the acceleration on the both direction.
In like manner, can constitute the acceleration transducer of the three-dimensional response of embodiment of the invention 3-, as shown in Figure 7.
Fig. 8 is the acceleration transducer of embodiment of the invention 4-by the M-Z interferometer type of 3 * 3 and 2 * 2 coupling mechanisms formation, described first fiber coupler 21 is 2 * 2 fiber couplers, and second fiber coupler 22 is 3 * 3 fiber couplers, and three output terminals of described second fiber coupler 22 link to each other with signal processing circuit module 82 through the detector 81 through three road light signals.
This is because 2 * 2 coupling mechanisms are more much lower than 3 * 3 coupling mechanism prices.This moment, the mathematic(al) representation of output port light intensity was:
I
1＝(I
0/3)[1-sin(φ-2π/3)]
I
2＝(I
0/3)[1-sin(φ)]
I
3＝(I
0/3)[1-sin(φ+2π/3)]
This explanation, the starting point of three ports output is different, but the phase relation between three ports is identical with two 3 * 3 coupler structures.Therefore still have identical characteristics and advantage.
Fig. 9 is the acceleration sensor structure synoptic diagram that embodiment of the invention 5-one end adopts the Michelson interferometer of fiber loop mirror to form, first fiber coupler 21 is 3 * 3 fiber couplers among the figure, and second fiber coupler 22 is 2 * 2 fiber couplers, two free ends of this second fiber coupler 22 are connected to each other, constitute a fiber loop mirror, in three ports of each of described first fiber coupler 21 both sides, two ports on right side connect two arms of Mach-Zehnder interferometer, and a port in left side connects wideband light source 7; Two ports connect two paths of signals processing circuit module 83 through detector 81 respectively in addition.
Therefore from the angle of light source and detector, in fact developed into a Michelson interferometer.But, difference is arranged again with general Michelson interferometer.General Michelson interferometer has an input port, an output port.Because the characteristic of 3 * 3 coupling mechanisms has two output ports in this structure, also have the phasic difference that is not equal to π between the light signal of these two output ports.Therefore the characteristics and the advantage that also have the principle of the invention and had.
The present invention adopts a pouring weight with certain mass to come the inertial force of sense accelerations generation from mechanical motion angle.Improve the sensitivity of sensor, just need be with the bigger pouring weight of quality.This has just brought the problem of optical fiber ability to bear.Lost efficacy for the damage of in transportation, installation and use, avoiding sensor, be necessary to adopt the certain protection measure.Figure 10 is the acceleration transducer that embodiment of the invention 6-is equipped with the amplitude seat.1 is pouring weight among the figure; 9 is that shape is similar to pouring weight 1, and the big slightly amplitude seat of size.When the inertial force that causes when acceleration made pouring weight 1 relative displacement excessive, it will be blocked by amplitude seat 9.So just can avoid optical fiber to be broken, perhaps be stretched to, reach the purpose of protection above elastically-deformable scope.
Claims (5)
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|---|---|---|---|
| CNB2005100264528A CN100357742C (en) | 2005-06-03 | 2005-06-03 | Acceleration sensor |
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|---|---|---|---|
| CNB2005100264528A CN100357742C (en) | 2005-06-03 | 2005-06-03 | Acceleration sensor |
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|---|---|
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| CN100357742C true CN100357742C (en) | 2007-12-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923102A (en) * | 2010-05-17 | 2010-12-22 | 哈尔滨工程大学 | Optical Fiber Accelerometer Based on Mach and Zeider Interferometer |
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|---|---|---|---|---|
| CN101482575B (en) | 2009-02-23 | 2011-02-09 | 东南大学 | A Resonant Integrated Optical Waveguide Accelerometer with Cantilever Beam Structure |
| CN101782595B (en) * | 2010-02-02 | 2011-06-22 | 浙江大学 | Multiplexing fiber optic inertial sensor unit for simultaneous measurement of acceleration and angular velocity |
| CN106125131B (en) * | 2016-09-08 | 2018-08-17 | 哈尔滨工程大学 | A kind of rotation seismic wave measuring device based on compound interferometer |
| CN107255735A (en) * | 2017-06-27 | 2017-10-17 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | A kind of three-dimensional fiber acceleration transducer of anti-strong electromagnetic |
| CN107478861A (en) * | 2017-06-27 | 2017-12-15 | 浙江大学 | One kind plays light type photonic crystal waveguide accelerometer |
| CN109470885B (en) * | 2018-10-19 | 2020-11-24 | 浙江大学 | A monolithic integrated optical accelerometer |
| CN112525238A (en) * | 2020-11-02 | 2021-03-19 | 上海大学 | Distributed optical fiber sensing system utilizing Mach-Zehnder interferometer filtering characteristics |
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|---|---|---|---|---|
| US4322829A (en) * | 1980-09-11 | 1982-03-30 | Dynamic Systems, Inc. | Fiber optic accelerometer and method of measuring inertial force |
| US5155548A (en) * | 1990-05-22 | 1992-10-13 | Litton Systems, Inc. | Passive fiber optic sensor with omnidirectional acoustic sensor and accelerometer |
| CN2570792Y (en) * | 2002-08-06 | 2003-09-03 | 复旦大学 | Multiple-testing total fibre-optical velocity interference apparatus |
| CN2608946Y (en) * | 2003-03-20 | 2004-03-31 | 上海安文信息技术有限公司 | High sensitivity optical fibre sensing interferometer |
| CN2669197Y (en) * | 2003-06-12 | 2005-01-05 | 复旦大学 | Multimode all-fiber speed measuring device |
| US6886404B2 (en) * | 2003-02-05 | 2005-05-03 | Fibersonde Corporation | Fiber optic accelerometer |
| US6900898B2 (en) * | 2000-08-03 | 2005-05-31 | Peleton Photonic Systems, Inc. | Temperature insensitive Mach-Zehnder interferometers and devices |
-
2005
- 2005-06-03 CN CNB2005100264528A patent/CN100357742C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4322829A (en) * | 1980-09-11 | 1982-03-30 | Dynamic Systems, Inc. | Fiber optic accelerometer and method of measuring inertial force |
| US5155548A (en) * | 1990-05-22 | 1992-10-13 | Litton Systems, Inc. | Passive fiber optic sensor with omnidirectional acoustic sensor and accelerometer |
| US6900898B2 (en) * | 2000-08-03 | 2005-05-31 | Peleton Photonic Systems, Inc. | Temperature insensitive Mach-Zehnder interferometers and devices |
| CN2570792Y (en) * | 2002-08-06 | 2003-09-03 | 复旦大学 | Multiple-testing total fibre-optical velocity interference apparatus |
| US6886404B2 (en) * | 2003-02-05 | 2005-05-03 | Fibersonde Corporation | Fiber optic accelerometer |
| CN2608946Y (en) * | 2003-03-20 | 2004-03-31 | 上海安文信息技术有限公司 | High sensitivity optical fibre sensing interferometer |
| CN2669197Y (en) * | 2003-06-12 | 2005-01-05 | 复旦大学 | Multimode all-fiber speed measuring device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923102A (en) * | 2010-05-17 | 2010-12-22 | 哈尔滨工程大学 | Optical Fiber Accelerometer Based on Mach and Zeider Interferometer |
| CN101923102B (en) * | 2010-05-17 | 2013-06-05 | 哈尔滨工程大学 | Fiber accelerometer based on Mach-Zehnder interferometer |
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|---|---|
| CN1693899A (en) | 2005-11-09 |
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