CN108761130A - A kind of all -fiber acceleration measurement device and method - Google Patents
A kind of all -fiber acceleration measurement device and method Download PDFInfo
- Publication number
- CN108761130A CN108761130A CN201810391034.6A CN201810391034A CN108761130A CN 108761130 A CN108761130 A CN 108761130A CN 201810391034 A CN201810391034 A CN 201810391034A CN 108761130 A CN108761130 A CN 108761130A
- Authority
- CN
- China
- Prior art keywords
- fiber
- port
- optical fiber
- optic splitter
- connect
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/16—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by evaluating the time-derivative of a measured speed signal
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Transform (AREA)
Abstract
The invention discloses a kind of all -fiber acceleration measurement device and method, which includes laser, fiber optical circulator, optical fiber collimator, 1 × 2 fiber optic splitter, fibre delay line, 2 × 1 fiber couplers, photodetector and signal processing unit.The output port of laser is connected by the first port of single mode optical fiber and fiber optical circulator, the second port of fiber optical circulator is connect with optical fiber collimator, the third port of fiber optical circulator is connect with 1 × 2 fiber optic splitter input terminal, first output port of 1 × 2 fiber optic splitter and the input terminal of fibre delay line connect, the output end of fibre delay line is connect with the first input port of 2 × 1 fiber couplers, the second output terminal mouth of 1 × 2 fiber optic splitter is directly connect with the second input port of 2 × 1 fiber couplers, the output end of 2 × 1 fiber couplers is connect with photodetector；The present invention has many advantages, such as topology layout advantages of simple and non-cpntact measurement, realizes high-precision acceleration analysis.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, more particularly to a kind of all -fiber acceleration measurement device and method.
Background technology
Acceleration is very important parameter index during object of which movement, and characterization measures the dynamic characteristic of object.Accelerate
The accurate measurement of degree has very important effect in industry, scientific research, military and civilian field.Existing acceleration measurement method
It is most of to use contact type measurement, because its measurement method has interference to the motion state of object, it will produce measurement error；In addition
The non-contacting measurement method in part then will first measure the speed of moving object, and acquire acceleration by operation, such as：Special
Profit number is in 2010101128841 patent document, just gives a kind of non-contact speed and acceleration measurement method, this method
Advanced row tachometric survey is needed, then could acceleration be calculated by the velocity measurement at former and later two moment.Because to accelerating
Degree is measured as indirect measure, therefore the error generated is larger, causes measurement result inaccurate.Especially for high transient state
Acceleration analysis there are low precision, can ranging from the defects of short, measurement range is narrow, these methods are difficult to smaller in displacement and accelerate
It spends under larger occasion and uses.
Invention content
In view of above-mentioned analysis, the present invention is intended to provide a kind of all -fiber acceleration measurement device and method, to non-
Under contact conditions, the direct measurement to moving target acceleration is solved the problems, such as.
In order to reach the purpose of the present invention, the present invention provides following technical scheme：A kind of all -fiber acceleration measurement device,
Including laser, three fiber port circulators, optical fiber collimator, fiber optic splitter, fibre delay line, fiber coupler, photoelectricity
Detector and computing unit, the optical function component are connected with each other using single mode optical fiber；The wherein output end of laser
Mouth is connect with the first port of three fiber port circulators, and second port and the optical fiber collimator of three fiber port circulators connect
It connects, the third port of three fiber port circulators is connect with fiber optic splitter input terminal, the first output port of fiber optic splitter
It is connect with fibre delay line input terminal, the output end of fibre delay line and the first input port of fiber coupler connect, optical fiber
The second output terminal mouth of beam splitter is directly connect with the second input port of fiber coupler, and the output end of fiber coupler passes through
Photodetector is connect with computing unit.
Further, the fiber optic splitter selects 1 × 2 fiber optic splitter, the fiber coupler to select 2 × 1 optical fiber
Coupler, 1 × 2 fiber optic splitter are identical as the optical fiber pigtail length of 2 × 1 fiber couplers.
Above-mentioned all -fiber acceleration measurement method, includes the following steps：The light that laser is sent out by Single-Mode Fiber Coupling extremely
The entry port of three fiber port circulators is emitted by the adjacent exit ports of three fiber port circulators, then passes through optical fiber
Collimator coupling outgoing, a part of light form reference light back from the end face reflection of optical fiber collimator, and another part light penetrates light
The end face of fine collimator, which is beaten, to be reflected to form sense light in moving object, two-beam generate beat signal, beat signal by
Optical fiber collimator is coupled back into single mode optical fiber, and is incident to three fiber port circulators, by the third end of three fiber port circulators
Mouth outgoing, and pass through Single-Mode Fiber Coupling to the input terminal of 1 × 2 fiber optic splitter, the first output end of 1 × 2 fiber optic splitter
By Single-Mode Fiber Coupling to the first input end of 2 × 1 fiber couplers, the second output terminal of 1 × 2 fiber optic splitter is coupled to light
The output end of the input terminal of fine delay line, fibre delay line is coupled to the second input terminal of 2 × 1 fiber couplers, 2 × 1 optical fiber
The output end of coupler is converted to electric signal by Single-Mode Fiber Coupling to photodetector, and processing analysis is carried out to the electric signal,
The signal processing unit according toIn conjunction with the delay time of fibre delay lineBy Δ f=k τ a, calculate
To acceleration a.
Compared with prior art, beneficial effects of the present invention are as follows：
1, the present invention is that fibre delay line is added on the basis of laser doppler technique, construct a kind of features simple structure,
Optical fiber type acceleration sensing device easy to implement, the transient state that can directly measure moving object in a non-contact manner accelerate
Degree.
2, the present invention is used in the acceleration analysis in detonation, collision and impact process, can avoid differentiating bringing
Large error, obtain accurately instantaneous acceleration, which has the characteristics that precision is high, applied widely.
Description of the drawings
Fig. 1 is the structural schematic diagram of all -fiber acceleration measurement device of the present invention
In figure, 1- lasers, tri- fiber port circulators of 2-, 3- optical fiber collimators, 4- moving objects, 5- fiber beam splittings
Device, 6- fibre delay lines, 7- fiber couplers, 8- photodetectors, 9-computing units.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with embodiment and attached drawing to this
Invention is described in further detail.
As shown in Figure 1, embodiment 1 provides a kind of all -fiber acceleration measurement device includes：Laser, three fiber port rings
Row device, optical fiber collimator, fiber optic splitter, fibre delay line, fiber coupler, photodetector and computing unit, the light
It learns function component to be connected with each other using single mode optical fiber, connection type is to connect by flanged joint or by welding mode.
The output port of described laser 1 is connect by single mode optical fiber with the entry port of three fiber port circulators 2 of 3 ports, and three
The adjacent exit ports of fiber port circulator 2 are connect by single mode optical fiber with the tail optical fiber of optical fiber collimator 3, three fiber port rings
The third port of row device 2 is connect by single mode optical fiber with the input terminal of 1 × 2 fiber optic splitter 4, and the of 1 × 2 fiber optic splitter 4
One output end is connect by single mode optical fiber with the first input end of 2 × 1 fiber couplers 7, and the second of 1 × 2 fiber optic splitter 4 is defeated
Outlet is connect with the input terminal of fibre delay line 6, the second input of the output end of fibre delay line 6 and 2 × 1 fiber couplers 7
End connection, the output end of 2 × 1 fiber couplers 7 are connect by single mode optical fiber with the tail optical fiber of photodetector 8, photodetector 8
Output end connect with computing unit 9 by single mode optical fiber.
Further, the fiber optic splitter selects 1 × 2 fiber optic splitter, for optical signal to be realized branch.
Further, the fibre delay line is single mode optical fiber, is used for transmission optical signal, and output radiofrequency signal can consider
It is the fiber medium with time delay function by optical fiber delay signal；The length of delay time and the optical fiber delay
The fiber lengths and optical fibre refractivity of line are directly proportional；
Further, the fiber coupler selects 2 × 1 fiber couplers, for by the reference light received and signal
Light exported to the photodetector after closing beam mixing；
Further, 1 × 2 fiber optic splitter is identical as the optical fiber pigtail length of 2 × 1 fiber couplers；
Further, the photodetector is used to receive the light beam after 2 × 1 fiber couplers close beam mixing.
In use, the acceleration measurement method of moving object 4 is as follows：The light that laser is sent out is by Single-Mode Fiber Coupling to three
The entry port of fiber port circulator is emitted by the adjacent exit ports of three fiber port circulators, then passes through optical fiber standard
Straight device coupling outgoing, a part of light form reference light back from the end face reflection of optical fiber collimator, and another part light penetrates optical fiber
The end face of collimator, which is beaten, to be reflected to form sense light in moving object, and two-beam generates beat signal, and beat signal is by light
Fine collimator is coupled back into single mode optical fiber, and is incident to three fiber port circulators, by the third port of three fiber port circulators
Outgoing, and by Single-Mode Fiber Coupling to the input terminal of 1 × 2 fiber optic splitter, the first output end of 1 × 2 fiber optic splitter by
For Single-Mode Fiber Coupling to the first input end of 2 × 1 fiber couplers, the second output terminal of 1 × 2 fiber optic splitter is coupled to optical fiber
The output end of the input terminal of delay line, fibre delay line is coupled to the second input terminal of 2 × 1 fiber couplers, 2 × 1 optical fiber couplings
The output end of clutch is converted to electric signal by Single-Mode Fiber Coupling to photodetector, and processing analysis is carried out to the electric signal, should
Signal processing unit according toIn conjunction with the delay time of fibre delay lineBy Δ f=k τ a, it is calculated
Acceleration a.
The principles illustrated of measurement process of the present invention is as follows：
With laser doppler, when moving object and light source generation relative motion, from surface of moving object
Reflected light will produce Doppler shift frequency, and the relationship of the speed and frequency difference that can obtain moving object is
In formula, v is the movement velocity of object, and λ is the wavelength of laser, and Δ f is the Doppler shift frequency of light wave.It can be pushed away by above formula
Export Doppler shift frequency and object of which movement acceleration relational expression
Δ f=k τ a
In formula, constantA is the acceleration of moving object, and τ is the fiber delay time time.And fiber delay time time and light
Fine length and effective refractive index is directly proportional, i.e.,
In formula, L is optical fiber delay line length, neffFor the effective refractive index of optical fiber, c is the light velocity in vacuum.Due to used
Fiber coupler is identical as the optical fiber pigtail length of fiber optic splitter, then above formula τ is delay time.Thus it can be learnt that
It is obtained by the interference formula of Doppler effect and light field：
In formula, I0For signal light intensity, IdTo refer to light intensity, f2For the frequency received, θ is the initial phase difference of two-beam.
It enablesReferred to as fringe number, then beat frequency be
So
I.e.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not limiting
The system present invention.For those skilled in the art, according to the thought of the present invention, several simplicity can also be made
It deduces, deform or replaces.
Claims (3)
1. a kind of all -fiber acceleration measurement device, it is characterised in that：It is accurate including laser, three fiber port circulators, optical fiber
Straight device, fiber optic splitter, fibre delay line, fiber coupler, photodetector and computing unit, the optical function component
It is connected with each other using single mode optical fiber；Wherein the output port of laser is connect with the first port of three fiber port circulators,
The second port of three fiber port circulators is connect with optical fiber collimator, third port and the optical fiber point of three fiber port circulators
Beam device input terminal connects, and the first output port of fiber optic splitter connect with fibre delay line input terminal, fibre delay line it is defeated
Outlet and the first input port of fiber coupler connect, the second output terminal mouth of fiber optic splitter directly with fiber coupler
Second input port connects, and the output end of fiber coupler is connect by photodetector with computing unit.
2. all -fiber acceleration measurement device according to claim 1, it is characterised in that：The fiber optic splitter selects 1 × 2
Fiber optic splitter, 2 × 1 fiber couplers of the fiber coupler selection, 1 × 2 fiber optic splitter and 2 × 1 fiber couplers
Optical fiber pigtail length is identical.
3. all -fiber acceleration measurement device according to claim 2, it is characterised in that：The all -fiber acceleration analysis side
Method includes the following steps：The light that laser is sent out by Single-Mode Fiber Coupling to the entry port of three fiber port circulators, by three
The adjacent exit ports of fiber port circulator are emitted, and are then coupled and are emitted by optical fiber collimator, a part of light is accurate from optical fiber
The end face reflection of straight device forms reference light back, and another part light is beaten through the end face of optical fiber collimator to be reflected in moving object
Sense light is formed back, and two-beam generates beat signal, and beat signal is coupled back into single mode optical fiber by optical fiber collimator, and is incident to
Three fiber port circulators are emitted by the third port of three fiber port circulators, and pass through Single-Mode Fiber Coupling to 1 × 2 light
The input terminal of fine beam splitter, the first output end of 1 × 2 fiber optic splitter is by the of Single-Mode Fiber Coupling to 2 × 1 fiber couplers
The second output terminal of one input terminal, 1 × 2 fiber optic splitter is coupled to the input terminal of fibre delay line, the output of fibre delay line
End is coupled to the second input terminal of 2 × 1 fiber couplers, and the output end of 2 × 1 fiber couplers is by Single-Mode Fiber Coupling to photoelectricity
Detector is converted to electric signal, and processing analysis is carried out to the electric signal, the signal processing unit according toIn conjunction with optical fiber
The delay time of delay lineBy Δ f=k τ a, acceleration a is calculated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018103011311 | 2018-04-04 | ||
| CN201810301131 | 2018-04-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108761130A true CN108761130A (en) | 2018-11-06 |
Family
ID=64012163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810391034.6A Pending CN108761130A (en) | 2018-04-04 | 2018-04-27 | A kind of all -fiber acceleration measurement device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108761130A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU877444A1 (en) * | 1980-02-13 | 1981-10-30 | Предприятие П/Я А-3759 | Method and device for measuring vibrational accelerations |
| CN1095482A (en) * | 1993-05-22 | 1994-11-23 | 电子科技大学 | A kind of acceleration sensing method with optical fibre and equipment |
| WO2006088974A2 (en) * | 2005-02-17 | 2006-08-24 | Metris Usa Inc. | Compact fiber optic geometry for a counter-chirp fmcw coherent laser radar |
| CN103116038A (en) * | 2013-01-21 | 2013-05-22 | 中国人民解放军国防科学技术大学 | Acceleration-measuring method by satellite receiver carrier tracking l |
| CN106443066A (en) * | 2016-09-23 | 2017-02-22 | 中国航空工业集团公司北京长城计量测试技术研究所 | Laser Doppler vibration measurement method impact acceleration measurement device and method |
| CN107783144A (en) * | 2017-10-30 | 2018-03-09 | 南京牧镭激光科技有限公司 | Windfinding laser radar apparatus |
-
2018
- 2018-04-27 CN CN201810391034.6A patent/CN108761130A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU877444A1 (en) * | 1980-02-13 | 1981-10-30 | Предприятие П/Я А-3759 | Method and device for measuring vibrational accelerations |
| CN1095482A (en) * | 1993-05-22 | 1994-11-23 | 电子科技大学 | A kind of acceleration sensing method with optical fibre and equipment |
| WO2006088974A2 (en) * | 2005-02-17 | 2006-08-24 | Metris Usa Inc. | Compact fiber optic geometry for a counter-chirp fmcw coherent laser radar |
| CN103116038A (en) * | 2013-01-21 | 2013-05-22 | 中国人民解放军国防科学技术大学 | Acceleration-measuring method by satellite receiver carrier tracking l |
| CN106443066A (en) * | 2016-09-23 | 2017-02-22 | 中国航空工业集团公司北京长城计量测试技术研究所 | Laser Doppler vibration measurement method impact acceleration measurement device and method |
| CN107783144A (en) * | 2017-10-30 | 2018-03-09 | 南京牧镭激光科技有限公司 | Windfinding laser radar apparatus |
Non-Patent Citations (3)
| Title |
|---|
| STEVE ROTHBERG 等: "The New Laser Doppler Accelerometer for Shock and Vibration Measurement", 《OPRICS AND LASERS IN ENGINEERING》 * |
| 孔德仁 等: "《兵器实验学》", 31 March 2016, 北京航空航天大学出版社 * |
| 郝冬杰 等: "激光多普勒测速光纤光路", 《国外电子测量技术》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108050941A (en) | A kind of CW with frequency modulation laser interference optical fiber displacement sensor and its displacement detecting method | |
| CN102636217B (en) | Sensing device based on joint detection of Brillouin optical time domain analysis and Mach-Zehnder interference | |
| CN104764898B (en) | It is a kind of to realize two kinds of velocity measuring techniques to a measuring point while the device of repetition measurement using single probe monochromatic light road | |
| CN106949842B (en) | Two-dimensional displacement measurer and measurement method | |
| CN103592652B (en) | Bifrequency Doppler laser radar detection system based on single four marginal technology of solid FP etalons | |
| CN103743552B (en) | A kind of caliberating device of wide range continuous light path delay line | |
| JPH09257415A (en) | Optical fiber sensor | |
| CN105547197B (en) | Measurement angle and the method and device of vibration while based on laser self-mixing interference | |
| CN108534686A (en) | A kind of no drift heterodyne laser Doppler measurement optic fibre light path and measurement method | |
| CN104698468A (en) | Fiber optic coherent ranging device and method | |
| KR20100062035A (en) | Measurement method of chromatic dispersion of optical beam waveguide using interference fringe measurement system | |
| CN105784336A (en) | Fiber device transmission and reflection performance test device and method | |
| CN106769736A (en) | A kind of powder concentration measurement system | |
| CN104535534B (en) | A kind of optical fiber precast rod refractivity profile measurement apparatus and measuring method based on the absolute light path comparison method of white light interference | |
| CN103620340A (en) | Coupled multi-wavelength confocal systems for distance measurements | |
| CN107064539A (en) | A kind of big visual field photon Doppler speed measuring device and method | |
| CN106441083A (en) | Laser feedback interferometer | |
| JPH0972723A (en) | Method and equipment for measuring thickness and refractive index of film | |
| CN102494799B (en) | Dual-wavelength optical delay optical fiber temperature sensor | |
| US5696579A (en) | Method, apparatus and system for determining the differential rate of change of strain | |
| EP2792996A1 (en) | Interferometric distance sensing device and method | |
| CN109374914A (en) | Larger Dynamic measurement range all -fiber Doppler speed measuring device | |
| US20190064446A1 (en) | Optical fiber sensor measuring apparatus | |
| CN100449317C (en) | High distinguishability subnanosecond magnitude optical three-dimensional accelerometer | |
| CN108761130A (en) | A kind of all -fiber acceleration measurement device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181106 |