CN104061996B - A kind of novel vibrating experiments of measuring device based on intermode interference principle - Google Patents
A kind of novel vibrating experiments of measuring device based on intermode interference principle Download PDFInfo
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- CN104061996B CN104061996B CN201410019769.8A CN201410019769A CN104061996B CN 104061996 B CN104061996 B CN 104061996B CN 201410019769 A CN201410019769 A CN 201410019769A CN 104061996 B CN104061996 B CN 104061996B
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Abstract
The present invention proposes a kind of novel vibrating experiments of measuring device based on intermode interference principle.The LASER Light Source 1 that this device uses centre wavelength to be 1550nm sends laser, laser is by being converted to voltage signal by photodetection circuit 10 after single mode multimode single-mode fiber 5 and being amplified, it is acquired by SR830 lock-in amplifier 2 afterwards, obtains output voltage signal.SR830 lock-in amplifier 2 provides the sinusoidal signal of given frequency, makes multimode fibre 12 vibrate by vibration and driving module 13, and therefore the output voltage of SR830 lock-in amplifier will change therewith.Test result indicate that, this device can measure the frequency of vibration signal continuously, and has obtained good linear characteristic, and its sensitivity is 4.7401mV/Hz, and measuring frequency range is 2Hz～80Hz.This device uses cantilever beam structure as vibration source, makes experimental configuration more simplify, and utilizes lock-in amplifier 2 to detect signal output, makes experimental data more accurate.
Description
Technical field
The present invention is a kind of novel vibrating experiments of measuring device based on intermode interference principle, belongs to fiber optic sensor technology
Field.
Background technology
Earlier 1900s, researchers begin to vibration measurement technique is carried out exploratory development.Constantly study at them
With in practice, vibration measurement technique gradually moves to maturity.The important parameter of vibration is mainly measured in vibration measurement, such as amplitude, frequently
The dynamic parameters such as rate, speed, acceleration and displacement.Vibration measurement technique is along with in engineering growing with each passing day vibration monitoring demand
And development, emerge a large amount of high-quality measurement equipment and advanced measuring method.At present, the method for vibration measurement is main
Including mechanical type, electric and optical profile type three class.
Commonly use both at home and abroad now is also based on electric vibrating sensor, such as electric vortex type vibrating sensor, pressure
Electric-type vibrating sensor, strain-type vibrating sensor and electrodynamic transducers.It is low, anti-dry that these sensors generally have sensitivity
Disturb ability, measure the shortcomings such as frequency range is narrow.So, in the urgent need to working out a kind of low cost, strong adaptability, highly sensitive
Vibration testing equipment.
In order to reach these requirements, researchers turn to Fibre Optical Sensor field sight.The most both at home and abroad optical fiber is passed
Sensor there has also been certain research, and most study is optical fiber raster vibration sensor, although his sensitivity is the highest, but sensing letter
Number demodulation relatively difficult, the demodulation product of actual application is few, and expensive (Michelson interference Fibre Optical Sensor and method
Background of cloth-Bo Luo interference-type sensor construction is the most more complicated, is unfavorable for practical operation).And shake based on intermode interference principle measurement
Dynamic relatively simple for structure, and need not the demodulated equipment of costliness, therefore researchers have been placed on intermode interference aspect sight.
Nineteen ninety-five, Lucas B.Soldamo et al. delivers literary composition on Journal of Lightwave Technology
Chapter, is discussed most important theories such as multimode fibre internal model interference effect, Self-focusing and transmission light field changes, from
Within 2003, rising, scholars starts to carry out single mode-multi-mode-single mode optical fiber (SMS) structure extensively and in-depth study, it is thus achieved that many
Many scientific achievements, as measured (document 1:Yuan Gong, Tian Zhao, Yun-Jiang Rao, the Yu such as strain, refractive index, pH
Wu. All-Fiber Curvature Sensor Based on Multimode Interference. IEEE
PHOTONICS TECHNOLOGY LETTERS, VOL. 23, NO. 11, JUNE 1,2011 document 2 Qiangzhou
Rong , Xueguang Qiao, Tuan Guo
Ruohui Wang, Jing Zhang, Manli Hu , Zhongyao Feng Yinyan Weng , Yue
Ma, Temperature-calibrated f iber-optic refractometer based on a compact FBG-
SMS structure, CHINESE OPTICS LETTERS, COL 10 (03), 030604 (2012)).Described in this article
Experimental provision, be based on being that light can produce the principle of intermode interference in single mode multimode single-mode fiber structure and sets
Meter
Devising a kind of novel vibrating experiments of measuring device based on intermode interference principle in the present invention, this device is good
The single mode multimode single-mode fiber structure that demonstrates may be used for measuring vibration, and drawn single mode multimode single-mode fiber
Frequency range and the sensitivity thereof of vibration can be measured.This device has structure compared with measuring vibration with traditional electric method
Simply, lightweight, highly sensitive, the series of advantages such as anti-electromagnetic interference capability is strong, corrosion resistance is strong.Many with conventional single mode
Mould single-mode fiber is measured vibration and is compared, and this experimental provision uses the cantilever beam structure of isosceles triangle as vibration source, it is ensured that
Optical fiber each point uniform force.And being provided sinusoidal signal by SR830 lock-in amplifier 2, signal is adjustable and scope is wide.And signal
Detection device uses SR380 lock-in amplifier 2, and signals collecting is more accurate.
Summary of the invention
(1), to solve the technical problem that
The present invention solves the demodulation difficulty of current transducing signal, and expensive, structure is complicated, and capacity of resisting disturbance is weak etc. asks
Topic mainly proposes a kind of novel vibrating experiments of measuring device based on intermode interference principle.
(2), technical scheme
In order to achieve the above object, the invention provides a kind of novel vibrating experiments of measuring based on intermode interference principle dress
Put.This device is to be fixed on by optical fiber on cantilever beam 7, and a permanent magnet 8 is fixed in cantilever beam 7 lower end.Put by SR830 is phase-locked
Big device 2 provides sinusoidal signal, then output is to solenoid 9 after signal amplification circuit 4 amplifies, and therefore solenoid 9 produces
Alternating magnetic field, drives the permanent magnet 8 of cantilever beam 7 tail end to vibrate back and forth, so that the multimode fibre 12 on cantilever beam 7 shakes
Dynamic.When multimode fibre 12 occurs vibration, occur the intensity of intermode interference to change, therefore can cause changing of output intensity
Becoming, this output signal is gathered by SR830 lock-in amplifier 2 after photodetection circuit 10, obtains corresponding output voltage,
It is hereby achieved that the relation between output voltage and frequency of vibration.
In such scheme, described vibration and the primary structure driving module 13 are cantilever beam 7.This cantilever beam 7 is fine by carbon
Dimension plate is constituted, in isosceles triangle shape, and long 20cm, bottom width 4cm, thickness 1.5mm.This structure can ensure that optical fiber is bonded at cantilever beam
During center, its each point institute uniform force.
In such scheme, described vibration and driving module 13 have employed solenoid 9 and permanent magnet 8.Two electromagnetism
The symmetrical shape of coil 9, internal diameter 10mm, external diameter 35mm, length 30mm, inductance value 22.6mH.Permanent magnet 8 radius 5mm.Logical
Cross and solenoid 9 is energized, make permanent magnet 8 vibrate, owing to permanent magnet 8 is fixed on cantilever beam 7, therefore cantilever beam
7 vibrate, and the multimode fibre 12 being further driven on cantilever beam 7 vibrates.
In such scheme, described light source uses the LASER Light Source 1 that centre wavelength is 1550nm.
In such scheme, the signal detection apparatus of described experimental provision uses SR830 lock-in amplifier 2, and SR830 locks
Phase amplifier 2 can effectively eliminate the accuracy of noise, beneficially experimental result.
In such scheme, described photodetection circuit 10 has a 1M amplification, detection wave-length coverage be 1100nm～
1700nm, responsiveness is 0.96A/W, and dark current is less than 1.0nA.Can put well for exporting the least voltage signal
Greatly.
(3), beneficial effect
From technique scheme it can be seen that the method have the advantages that
1) present invention uses isosceles triangle cantilever beam structure, and material is made up of carbon fiber board, is not only simple in structure, and
And can ensure that when optical fiber is bonded at cantilever beam 7 center, its each point institute uniform force.
2) present invention uses SR830 lock-in amplifier 2 to provide sinusoidal signal, solenoid 9 drive cantilever beam 7 to shake
Dynamic, frequency-adjustable and the scope of vibration signal are wide.
3) experimental provision uses SR830 lock-in amplifier 2 can effectively eliminate noise, improves measurement accuracy.
4), when what experimental provision was good demonstrates multimode fibre 12 generation vibration, light is at single mode multimode single-mode fiber 5
Middle meeting interferes, and when multimode fibre 12 frequency of vibration changes, interference strength also can change, therefore output intensity
Will change.
5) final result is passed through, it can be deduced that single mode multimode single-mode fiber 5 structure can measure vibration frequency well
The change of rate.And the frequency of vibration measured becomes good linear relationship with the voltage of display, sensitivity is 4.7401mV/Hz,
Measuring frequency range is 2Hz～80Hz.
(4), accompanying drawing explanation
Fig. 1 is the system construction drawing of a kind of novel vibrating experiments of measuring device based on intermode interference principle.
Fig. 2 is single mode multimode single-mode fiber 5 structural representation.
Fig. 3 is the relation curve between voltage signal and cantilever beam 7 frequency of vibration that SR830 lock-in amplifier 2 detects
Figure.
(5), detailed description of the invention
For making above-mentioned purpose, advantage more understandable, below in conjunction with the accompanying drawings and detailed description of the invention is further to the present invention
Explanation.
The present invention is achieved by the following technical solutions.This novel vibrating experiments of measuring based on intermode interference principle
Device mainly includes the LASER Light Source 1 that centre wavelength is 1550nm, single mode multimode single-mode fiber 5, vibrates and drives mould
Block 13, signal detection and processing module 14.Connected mode between each module is as shown in Figure 1: centre wavelength is 1550nm laser
Light source 1 is connected with single mode multimode single-mode fiber 5, and wherein multimode fibre 12 is fixed on vibration and drives the cantilever of module 13
Above beam 7, the optical fiber other end is connected with processing module 14 with signal detection.Vibration and driving module 13 include lock-in amplifier
2, signal amplifier 4, power supply 3, support 6, cantilever beam 7, permanent magnet 8, solenoid 9.Signal detection is wrapped with processing module 14
Include photodetection circuit 10, SR830 lock-in amplifier 2.The wherein outfan of single mode multimode single-mode fiber 5 and photodetection
Circuit 10 is connected, and is finally detected by SR830 lock-in amplifier 2.
The vibration signal of the present invention produces with the following method:
Permanent magnet 8 is fixed on above cantilever beam 7, and cantilever beam 7 and solenoid 9 are fixed on above support 6, such as Fig. 1 institute
Showing, the sinusoidal signal that SR830 lock-in amplifier 2 produces is supplied to solenoid 9 through signal amplification circuit 4, makes solenoid 9
Produce electromagnetic force, interact with permanent magnet 8, make permanent magnet 8 vibrate, and drive cantilever beam 7 that sinusoidal vibration occurs.
The sensing principle of the present invention is as described below:
Light, in intersecting area, forms one group of stable light and dark speckle, referred to as interference of light phenomenon.Interference of light
Coherent condition: (1) frequency is identical；(2) there is the oscillating component being parallel to each other；(3) phase contrast is stable.For in multimode fibre
Each pattern, because deriving from same light source so its frequency is identical, oscillating component can be divided into vertical and horizontal, Mei Gemo
Formula phase place is unique, as long as therefore light source is coherent source, just meets interference of light condition between each pattern in multimode fibre.?
The LASER Light Source 1 using centre wavelength to be 1550nm in this device, when laser is entered multimode fibre 12 by single-mode fiber 11
Can motivate the light of multiple pattern, the light between each pattern meets interference condition, therefore enters back into when the light of these patterns
Will interfere during another section single-mould fiber 11.When multimode fibre 12 occurs vibration, interference strength can be made to change, logical
Crossing and gather this change and just can measure vibration, therefore single mode multimode single-mode fiber 5 structure may be used for measuring vibration.
Specific implementation process of the present invention is as follows:
In single mode multimode single-mode fiber 5, multimode fibre 12 is pasted onto above cantilever beam 7.Wherein single mode multimode list
Mode fiber 5 is mainly formed, such as Fig. 2 by 11, one section of multimode fibre of a section single-mould fiber 12 and section single-mould fiber 11 welding
Shown in.Cantilever beam 7 vibration can drive the multimode fibre 12 in single mode multimode single-mode fiber 5 to vibrate.Optical signal is many
It is converted into voltage signal with processing module 14 by signal detection and detects after interfering in mode fiber 12.Because cantilever beam 7
Happens is that the vibration of given frequency, the voltage that SR830 lock-in amplifier 2 is detected by we is demarcated, afterwards by mark
The one of the fixed voltage signal that both can obtain detecting with SR830 lock-in amplifier 2 at the frequency of vibration of this device Analysis of A Cantilever Beam Under 7
One corresponding relation is as shown in Figure 3.Thus draw the pass of the voltage that cantilever beam 7 frequency of vibration detects with SR830 lock-in amplifier 2
It is as follows:
WhereinIt is the frequency of vibration of cantilever beam 7,It it is the output voltage of SR830 lock-in amplifier 2
This experimental provision utilizes vibration and drives module 13 to provide vibration to multimode fibre 12.Vibration to given frequency
Signal measures, and uses SR830 lock-in amplifier 2 to carry out signals collecting, it is possible to exclusive PCR to greatest extent, finally marks
Make the relation of frequency of vibration and voltage.This device sufficiently demonstrates single mode multimode single-mode fiber 5 structure and can use
In measuring vibration signal.It is 4.7401mV/Hz that experiment records sensitivity, and measurement scope is 2Hz～80Hz.
Claims (7)
1. a novel vibrating experiments of measuring device based on intermode interference principle, mainly includes that centre wavelength is swashing of 1550nm
Radiant (1), single mode multimode single-mode fiber (5), vibrates and drives module (13), signal detection and processing module
(14), it is characterised in that: centre wavelength is LASER Light Source (1) one end with single mode multimode single-mode fiber (5) of 1550nm
Connecting, wherein in single mode multimode single-mode fiber (5), multimode fibre (12) is fixed on vibration and drives the outstanding of module (13)
Above, the other end of single mode multimode single-mode fiber (5) is connected, wherein with processing module (14) arm beam (7) with signal detection
In vibration and driving module (13), a permanent magnet (8) is fixed in cantilever beam (7) lower end, puts by a SR830 is phase-locked
Big device provides sinusoidal signal, accesses solenoid (9) through signal amplification circuit (4), and solenoid (9) produces alternating magnetic field, from
And driving the permanent magnet (8) of cantilever beam (7) tail end to vibrate back and forth, the multimode fibre (12) on cantilever beam (7) shakes therewith
Dynamic, then output intensity will change, and optical signal enters photodetection circuit afterwards by single mode multimode single-mode fiber (5)
(10), finally by the 2nd SR830 lock-in amplifier gather, it is possible to obtain the 2nd SR830 lock-in amplifier output voltage with
Relation between multimode fibre (12) frequency of vibration.
A kind of novel vibrating experiments of measuring device based on intermode interference principle, it is characterised in that:
Vibration and driving module (13) include a SR830 lock-in amplifier (2), signal amplification circuit (4), support (6), cantilever beam
(7), permanent magnet (8), solenoid (9), the signal output part of a SR830 latching amplifier and signal amplification circuit (4) phase
Even, power supply (3) is connected with signal amplification circuit (4), powers to signal amplification circuit (4), signal amplification circuit (4) and electromagnetic wire
Circle (9) is connected, and permanent magnet (8) is fixed on cantilever beam (7) above, and cantilever beam (7) and solenoid (9) are fixed on support (6)
Above, a SR830 lock-in amplifier (2) gives solenoid (9) for sinusoidal signal, is allowed to produce electromagnetic force, and electromagnetic force is with forever
Magnet (8) interacts for a long time, finally drives the multimode fibre (12) on cantilever beam (7) that sinusoidal vibration occurs.
A kind of novel vibrating experiments of measuring device based on intermode interference principle, it is characterised in that:
Wherein single mode-multi-mode-single mode optical fiber (5) by core diameter be 9 μm, cladding diameter be single-mode fiber (11) and the fibre core of 125 μm
Multimode fibre without covering (12) welding of a diameter of 125 μm forms.
A kind of novel vibrating experiments of measuring device based on intermode interference principle, it is characterised in that:
Signal detection is with processing module (14), and the photodetection circuit (10) of optical signals 1M amplification is converted to voltage signal,
It is acquired by the 2nd SR830 lock-in amplifier afterwards.
A kind of novel vibrating experiments of measuring device based on intermode interference principle, it is characterised in that
Described cantilever beam (7) is made up of carbon fiber board, and in isosceles triangle shape, long 20cm, bottom width 4cm, thickness 1.5mm, single order is solid
Having frequency 50Hz, this structure can ensure that when optical fiber is bonded at cantilever beam center, its each point institute uniform force.
A kind of novel vibrating experiments of measuring device based on intermode interference principle, it is characterised in that
Described solenoid (9) internal diameter is 10mm, and external diameter is 35mm, a length of 30mm, and inductance value is 22.6mH.
A kind of novel vibrating experiments of measuring device based on intermode interference principle, it is characterised in that
Described permanent magnet (8) radius is 5mm, and magnetic induction is 0.58Gs.
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| CN104483509B (en) * | 2014-12-23 | 2018-02-13 | 东南大学 | A kind of multiple-mode interfence optics integrated-type accelerometer |
| CN110108347A (en) * | 2019-05-13 | 2019-08-09 | 安徽理工大学 | A kind of device and method of flexible cantilever vibration of beam non-contact measurement and Untouched control |
| CN115507937A (en) * | 2022-01-21 | 2022-12-23 | 芯元(浙江)科技有限公司 | Piezoelectric sensor calibration device and method and vibration sensor |
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| CN101782601A (en) * | 2009-05-18 | 2010-07-21 | 东北大学 | Concatenation-type fiber bragg grating self-demodulation current sensor |
| CN101852815A (en) * | 2010-05-13 | 2010-10-06 | 北京交通大学 | Temperature self-compensating cantilever beam type fiber grating accelerometer |
| CN103076082A (en) * | 2013-01-04 | 2013-05-01 | 北京交通大学 | Single mode-multimode-single mode fiber intermode interference-based vibration and stress sensing device |
| JP5367347B2 (en) * | 2008-11-26 | 2013-12-11 | 古河電気工業株式会社 | Optical fiber sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5367347B2 (en) * | 2008-11-26 | 2013-12-11 | 古河電気工業株式会社 | Optical fiber sensor |
| CN101782601A (en) * | 2009-05-18 | 2010-07-21 | 东北大学 | Concatenation-type fiber bragg grating self-demodulation current sensor |
| CN101852815A (en) * | 2010-05-13 | 2010-10-06 | 北京交通大学 | Temperature self-compensating cantilever beam type fiber grating accelerometer |
| CN103076082A (en) * | 2013-01-04 | 2013-05-01 | 北京交通大学 | Single mode-multimode-single mode fiber intermode interference-based vibration and stress sensing device |
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