CN107576956B - A kind of damage reason location system of the forward and reverse detection of fluorescence optical fiber - Google Patents
A kind of damage reason location system of the forward and reverse detection of fluorescence optical fiber Download PDFInfo
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Abstract
A kind of damage reason location system of the forward and reverse detection of fluorescence optical fiber, including fluorescence optical fiber sension unit, photoelectric processing unit, damage reason location processing unit.Fluorescence optical fiber coated with piezallochromy gathering induced luminescence material is arranged in measured target and forms fluorescence optical fiber sension unit；After measured target is by external impact or shock, the molecular entergy level level and luminescent spectrum of fluorescence optical fiber change, and generate piezoluminescence；The optical signal that fluorescence optical fiber generates is received by photoelectric processing unit, and the optical signal received is converted to electric signal by photoelectric processing unit, is handled, and obtains fluorescence decay time, and export and give damage reason location processing unit；Damage reason location processing unit obtains the coordinate of damage position by time difference and orthogonal fluorescence optical fiber the intersection point unique characteristic for reaching same coding fluorescence optical fiber both ends photoelectric processing unit both ends.The present invention realizes that impact damage positioning real-time monitoring simplifies system structure using unglazed source forcing system.
Description
Technical field
The invention belongs to field of measuring technique, are related to a kind of damage reason location system.
Background technique
With the development of information technology and the rise of New military transform, the fighting efficiency of weaponry is by countries in the world weight
Depending on.The purpose of weapons equipment test training is the fighting efficiency of identification and assessment weapon system, and precision and damage effectiveness quantify
Assessment, depends on the hitting information of acquisition.
For a long time, aircraft test effect is assessed, mainly using technologies such as optical imagery, photoelectric tracking, radar trackings
Means implement measurement of missing the target.Above-mentioned measurement method of missing the target can only be made whether to intercept successful qualitative judgement, can not obtain in real time
The information such as damage position, damaged area and process, it is difficult to impact damage effect be quantitatively evaluated.
Due to aircraft when by hitting apart from ground telemetering station farther out, and the effect of impact time is extremely short, using telemetering
Impact damage position and effect can not be observed and be determined to means, fault localization system that can only be self-contained by means of aircraft.
Impact damage detection system is applied to the in-orbit perception field of impact from space debris more at present, carries out impingement position measurement and injures effect
Fruit assessment, more mature technical measures such as electromagnetic radiation technology, resistance film detection technique, gather inclined fluorine at acoustic emission
Ethylene (PVDF) piezoelectric membrane is exactly, capacitance sensing detection technique etc., is based on electrical sensor and builds impact damage detection system
System.Since the crushing effect of impact time is extremely short, cause aircraft and impact damage detection system life span extremely short, in order to and
When acquire impingement position information, it is desirable that in 10MHz or more, this is one to electrical sensor and huge chooses sensor response frequency
War, in addition, knockout process can generate strong electromagnetic interference, easily causes electrical sensor to fail.Therefore, it is sensed using electric class
Device is difficult to realize aircraft fault localization when destructiveness is hit.
Due to optical fiber have small in size, light weight, intensity height, good bandability, flexibility it is good, not by Electromagnetic Interference, no
Additional power source, corrosion-resistant, the advantages that being easy to be embedded to structural body, establishing monitoring grid, is at low cost are needed, so its sensor application is led
Domain is quite extensive, and existing research personnel are applied to aircraft impact damage detection system.
Alignment sensor in the prior art it is generally existing it is at high cost, resolution speed is slow, is unable to reach the measurement of low-power consumption
It is required that mainly for the crushing or non-crushing fault localization for hitting single operating condition, can not both take into account.
Summary of the invention
Technology of the invention solves the problems, such as: overcoming the deficiencies of the prior art and provide a kind of forward and reverse detection of fluorescence optical fiber
Damage reason location system adapts to the impingement position under the conditions of external force collision using the fluorescence optical fiber piezoluminescence characteristic of special coating
Measurement demand (destructive and non-destructive)；Realize impact damage dynamic process real-time monitoring；Using unglazed source forcing system, letter
Change system structure, reduces system cost and power consumption.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows: a kind of forward and reverse detection of fluorescence optical fiber
Damage reason location system, comprising: fluorescence optical fiber sension unit, photoelectric processing unit, damage reason location processing unit；Fluorescence optical fiber perception
Unit is arranged in measured target surface and is fixed；It applies outside suffered by fluorescence optical fiber sension unit sensitivity to measured target
The power added generates pressure and causes optical signal, and causes optical signal transmission to photoelectric processing unit pressure；Photoelectric processing unit causes light letter to pressure
It number is handled, obtains fluorescence decay time, and export to damage reason location processing unit；Damage reason location processing unit is caused according to pressure
The time difference that optical signal reaches same coding fluorescence optical fiber both ends photoelectric processing unit obtains the coordinate of damage position.
The fluorescence optical fiber sension unit includes transverse direction k root fluorescence optical fiber, longitudinal direction m root fluorescence optical fiber, and fluorescence optical fiber is in length and breadth
Orthogonal formation optical fiber lattice, each vertical or horizontal fluorescence optical fiber are composed of fixed coding, and fluorescence optical fiber is coated with pressure and causes
Change colour gathering induced luminescence material, wherein k is positive integer, and m is positive integer.
The photoelectric processing unit includes photoelectric processing device, and every fluorescence optical fiber both ends are separately connected a photoelectric processing
Device；Photoelectric processing device includes: photoelectric conversion module, amplifier, A/D conversion module, dsp chip；Photoelectric conversion module will receive
To pressure cause fluorescence signal be converted into electric signal, be sent to amplifier；Amplifier amplifies the electric signal received, and passes
Transport to A/D conversion module；After A/D conversion module converts electrical signals to digital signal, it is transferred to dsp chip；Dsp chip is first
Fast Fourier Transform (FFT) is carried out to digital signal, selection obtains the spectral term of frequency spectrum, and obtains the argument or width of corresponding spectrum spectral term
Tangent of an angle value, the tangent value of argument or argument further according to spectral term calculate pressure and the corresponding fluorescence of attenuation curve of optical signal are caused to decline
Fall the time, according to fluorescence decay time judge the road fluorescence optical fiber whether stress or Damage and Fracture.
The damage reason location processing unit is reached according to piezoluminescence signal is located at same root longitudinal direction fluorescence optical fiber both ends
Time difference obtains the forced position of corresponding longitudinal fluorescence optical fiber to the length l of longitudinal fluorescence optical fiber reference edge1, and according to
Piezoluminescence signal reaches the time difference for being located at the fluorescence optical fiber both ends of same root transverse direction, obtains corresponding lateral fluorescence optical fiber
Length l of the forced position to lateral fluorescence optical fiber reference edge2, wherein set any end in longitudinal fluorescence optical fiber both ends
For longitudinal fluorescence optical fiber reference edge, the fluorescence optical fiber benchmark that any end in lateral fluorescence optical fiber both ends is transverse direction is set
End；According to the one-to-one relationship of each intersection point of fluorescence optical fiber sension unit optical fiber lattice and measured target surface location, determine
Measured target damage position.
Length l of the forced position of longitudinal fluorescence optical fiber to longitudinal fluorescence optical fiber reference edge1Calculation formula
It is as follows:
Wherein, L1For be arranged in measured target longitudinal fluorescence optical fiber length, Δ t1It is reached for piezoluminescence signal vertical
To the fluorescence optical fiber other end and reach the time difference of longitudinal fluorescence optical fiber reference edge, c is the propagation speed of light in a vacuum
Degree, n are the refractive index of sensor fibre fibre core.
Length l of the forced position of the lateral fluorescence optical fiber to lateral fluorescence optical fiber reference edge2Calculation formula
It is as follows:
Wherein, L2For be arranged in measured target lateral fluorescence optical fiber length, Δ t2It is reached for piezoluminescence signal horizontal
To the fluorescence optical fiber other end and reach the time difference of lateral fluorescence optical fiber reference edge.
The advantages of the present invention over the prior art are that:
(1) present system compared with prior art, based on be coated with piezallochromy gathering induced luminescence material fluorescence
Fiber-optic probe, which is realized, measures the destructive at the high-speed impact position of aircraft and non-destructive, and hits condition in non-destructive
It is lower to can be achieved that measurement is repeated several times.
(2) present system compared with prior art, reaches same coding fluorescence optical fiber both ends light by detection optical signal
The time difference of the positive and negative both direction of electric treatment unit and the unique characteristic of orthogonal fluorescence optical fiber intersection point obtain the seat of damage position
Mark.
(3) present system compared with prior art, by the fluorescence analysis generated to external force collision piezoluminescence, obtains
Fluorescence decay time realizes the damage position positioning of measured target.
(4) present system compared with prior art, using unglazed source forcing system, reduces light in conventional optical systems
The use of the optical devices such as source, coupler, simplifies system structure, reduces system cost and power consumption.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the damage reason location system of the forward and reverse detection of fluorescence optical fiber in the present invention；
Fig. 2 is photoelectric processing device composition block diagram of the present invention；
Fig. 3 is a kind of damage reason location system flow chart of the forward and reverse detection of fluorescence optical fiber of the present invention.
Specific embodiment
The damage that the present invention proposes a kind of forward and reverse detection of fluorescence optical fiber for aircraft impingement position measurement demand is fixed
Position system realizes aircraft impact damage dynamic process real-time monitoring, and is suitable for the destructive and non-under the conditions of external force collision
Destructive impingement position measurement demand effectively realizes impact damage dynamic compared with existing impingement position measuring technique
Process real-time monitoring, simplifies system structure, reduces system cost and power consumption, and can be achieved under the conditions of non-destructive is hit
Measurement is repeated several times.As shown in Figure 1, Figure 3, this system includes: fluorescence optical fiber sension unit 1, photoelectric processing unit 2, damages and determine
Bit processing unit 3.
After measured target is by external impact or shock, fluorescence optical fiber sension unit 1 is sensitive to be arrived impact or hits generation
Pressure, the fluorescence optical fiber 101 coated with piezallochromy gathering induced luminescence material generate piezoluminescence, fluorescence optical fiber sension unit
The 1 piezoluminescence signal generated is transmitted to photoelectric processing unit 2；Photoelectric processing unit 2 receives optical signal, carries out photoelectricity and turns
It changes, amplify, the processing such as analog/digital conversion, digital signal carries out Fourier to the dsp chip in photoelectric processing unit 2 to treated
Transformation, obtains the fluorescence decay time of piezoluminescence signal, and photoelectric processing unit 2 exports fluorescence decay time to damage reason location
Processing unit 3；Damage reason location processing unit 3 receives fluorescence decay time, and causes the same coding of optical signal arrival glimmering by pressure
Forward and reverse time difference of light optical fiber both ends photoelectric processing unit 2, (pressure caused optical signal to reach same coding fluorescence optical fiber both ends photoelectricity
Forward and reverse time difference of processing unit 2 was obtained according to fluorescence decay time, specifically: reach same root fluorescence optical fiber 101
The fluorescence decay time difference of the other end and reference edge) and the unique characteristic acquisition damage position of orthogonal fluorescence optical fiber intersection point
Coordinate.Fluorescence optical fiber sension unit 1 is arranged in measured target and fixation, by lateral k root fluorescence optical fiber 101 and longitudinal direction m root fluorescence
The orthogonal composition, including k × m optical fiber intersection point 4 in length and breadth of optical fiber 101 is laid out, each vertical or horizontal fluorescence optical fiber in grid-shaped
It is composed of fixed coding, determining for impact damage is realized by the intersection location of external force pressure according to vertical and horizontal fluorescence optical fiber
Position.Fluorescence optical fiber 101 is coated with piezallochromy gathering induced luminescence material, and the crystalline texture of the material occurs under external force
Change, its molecular entergy level level and luminescent spectrum is caused to change, fluorescence optical fiber 101 generates piezoluminescence phenomenon.Fluorescence light
Fine sension unit 1 receives extraneous shock, and to hitting, external force progress is sensitive, and fluorescence optical fiber 101 generates piezoluminescence, and light is believed
Number it is transmitted to photoelectric processing unit 2.Wherein, k is positive integer, and m is positive integer.
Photoelectric processing unit 2 is made of a photoelectric processing device 201 of 2 (k+m), and every 101 both ends of fluorescence optical fiber are separately connected
Photoelectric processing device 201 all the way；As shown in Fig. 2, including: two pole of PIN-based diode or snowslide per photoelectric processing device 201 all the way
Photoelectric conversion module, amplifier, modulus (A/D) conversion module, dsp chip of pipe；Photoelectric conversion module, which receives to hit, presses cause glimmering
Optical signal, and electric signal is converted thereof into, output to amplifier；Amplifier receives the electric signal after photoelectric conversion, is amplified,
And it is transmitted to modulus (A/D) conversion module；Modulus (A/D) conversion module receives amplified electric signal, and is converted into number
Word signal is transferred to dsp chip and is calculated；Dsp chip receives the digital signal after conversion, carries out in quick Fu to it first
Leaf transformation (FFT), selection obtain the spectral term of frequency spectrum, the argument of spectral term or the tangent value of argument are calculated, further according to spectral term
The tangent value of argument or argument calculates the attenuation curve and corresponds to fluorescence decay time, whether judges the road fluorescence optical fiber 101 with this
Stress or Damage and Fracture, and fluorescence decay time is transmitted to damage reason location processing unit 3.
Setting any end in longitudinal 101 both ends of fluorescence optical fiber, as longitudinal 101 reference edge of fluorescence optical fiber, setting is lateral
101 both ends of fluorescence optical fiber in any end be lateral 101 reference edge of fluorescence optical fiber: damage reason location processing unit 3, receive light
The fluorescence decay time that electric treatment unit 2 exports reaches according to piezoluminescence signal and is located at 101 liang of same root longitudinal direction fluorescence optical fiber
The time difference at end obtains the forced position of corresponding longitudinal fluorescence optical fiber 101 to the length of longitudinal 101 reference edge of fluorescence optical fiber
l1, and the time difference for being located at 101 both ends of fluorescence optical fiber of same root transverse direction is reached according to piezoluminescence signal, it obtains corresponding lateral
Fluorescence optical fiber 101 forced position to lateral 101 reference edge of fluorescence optical fiber length l2, according to fluorescence optical fiber sension unit
Each intersection point of 1 optical fiber lattice and the one-to-one relationship of measured target surface location, determine measured target damage position.
Length l of the forced position of longitudinal fluorescence optical fiber 101 to longitudinal 101 reference edge of fluorescence optical fiber1Calculating it is public
Formula is as follows:
Wherein, L1For be arranged in measured target longitudinal fluorescence optical fiber 101 length, Δ t1It is arrived for piezoluminescence signal
Up to the time difference of longitudinal 101 other end of fluorescence optical fiber and 101 reference edge of fluorescence optical fiber for reaching longitudinal direction, c is light in vacuum
In spread speed, n be sensor fibre fibre core refractive index.
Length l of the forced position of lateral fluorescence optical fiber 101 to lateral 101 reference edge of fluorescence optical fiber2Calculating it is public
Formula is as follows:
Wherein, L2For be arranged in measured target lateral fluorescence optical fiber 101 length, Δ t2It is arrived for piezoluminescence signal
Up to the time difference of lateral 101 other end of fluorescence optical fiber and 101 reference edge of fluorescence optical fiber for reaching transverse direction.
The above, only the preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, it is any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
Claims (5)
1. a kind of damage reason location system of the forward and reverse detection of fluorescence optical fiber characterized by comprising fluorescence optical fiber sension unit
(1), photoelectric processing unit (2), damage reason location processing unit (3)；Fluorescence optical fiber sension unit (1) is arranged in measured target surface
And it is fixed；Fluorescence optical fiber sension unit (1) is sensitive to the external power applied suffered by measured target, generates pressure and causes light letter
Number, and cause optical signal transmission to photoelectric processing unit (2) pressure；Photoelectric processing unit (2) causes optical signal to handle pressure, obtains
Fluorescence decay time is obtained, and is exported to damage reason location processing unit (3)；Damage reason location processing unit (3) causes optical signal according to pressure
The time difference for reaching same coding fluorescence optical fiber (101) both ends photoelectric processing unit (2) obtains the coordinate of damage position；The light
Electric treatment unit (2) includes photoelectric processing device (201), and every fluorescence optical fiber (101) both ends are separately connected a photoelectric processing device
(201)；Photoelectric processing device (201) includes: photoelectric conversion module, amplifier, A/D conversion module, dsp chip；Photoelectric conversion mould
The pressure received cause fluorescence signal is converted into electric signal by block, is sent to amplifier；Amplifier carries out the electric signal received
Amplification, and it is transmitted to A/D conversion module；After A/D conversion module converts electrical signals to digital signal, it is transferred to dsp chip；
Dsp chip carries out Fast Fourier Transform (FFT) to digital signal first, and selection obtains the spectral term of frequency spectrum, and obtains corresponding spectrum spectral term
Argument or argument tangent value, the tangent value of argument or argument further according to spectral term calculates the attenuation curve pair that pressure causes optical signal
The fluorescence decay time answered, according to fluorescence decay time judge the road fluorescence optical fiber (101) whether stress or Damage and Fracture.
2. a kind of damage reason location system of the forward and reverse detection of fluorescence optical fiber according to claim 1, which is characterized in that described
Fluorescence optical fiber sension unit (1) includes transverse direction k root fluorescence optical fiber (101), longitudinal direction m root fluorescence optical fiber (101), fluorescence optical fiber
(101) orthogonal formation optical fiber lattice in length and breadth, each vertical or horizontal fluorescence optical fiber are composed of fixed coding, fluorescence optical fiber
(101) it is coated with piezallochromy gathering induced luminescence material, wherein k is positive integer, and m is positive integer.
3. a kind of damage reason location system of the forward and reverse detection of fluorescence optical fiber according to claim 1, which is characterized in that described
Damage reason location processing unit (3) reaches the time for being located at same root longitudinal direction fluorescence optical fiber (101) both ends according to piezoluminescence signal
Difference obtains the forced position of corresponding longitudinal fluorescence optical fiber (101) to the length l of longitudinal fluorescence optical fiber (101) reference edge1,
And the time difference for being located at fluorescence optical fiber (101) both ends of same root transverse direction is reached according to piezoluminescence signal, it obtains corresponding lateral
Fluorescence optical fiber (101) forced position to lateral fluorescence optical fiber (101) reference edge length l2, wherein it sets longitudinal
Any end is longitudinal fluorescence optical fiber (101) reference edge in fluorescence optical fiber (101) both ends, sets lateral fluorescence optical fiber
(101) any end is lateral fluorescence optical fiber (101) reference edge in both ends；According to fluorescence optical fiber sension unit (1) optical network
Each intersection point of lattice and the one-to-one relationship of measured target surface location, determine measured target damage position.
4. a kind of damage reason location system of the forward and reverse detection of fluorescence optical fiber according to claim 3, which is characterized in that described
Length l of the forced position of longitudinal fluorescence optical fiber (101) to longitudinal fluorescence optical fiber (101) reference edge1Calculation formula such as
Under:
Wherein, L1For be arranged in measured target longitudinal fluorescence optical fiber (101) length, Δ t1For the arrival of piezoluminescence signal
The time difference of longitudinal fluorescence optical fiber (101) other end and fluorescence optical fiber (101) reference edge for reaching longitudinal direction, c are light true
Aerial spread speed, n are the refractive index of sensor fibre fibre core.
5. a kind of damage reason location system of the forward and reverse detection of fluorescence optical fiber according to claim 4, which is characterized in that described
Length l of the forced position of lateral fluorescence optical fiber (101) to lateral fluorescence optical fiber (101) reference edge2Calculation formula such as
Under:
Wherein, L2For be arranged in measured target lateral fluorescence optical fiber (101) length, Δ t2For the arrival of piezoluminescence signal
The time difference of lateral fluorescence optical fiber (101) other end and fluorescence optical fiber (101) reference edge for reaching transverse direction.
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| CN103674083A (en) * | 2013-12-13 | 2014-03-26 | 北京航天时代光电科技有限公司 | High-speed particle impact test system |
| CN106643838A (en) * | 2016-12-01 | 2017-05-10 | 北京航天控制仪器研究所 | Bumping position measuring system and method based on bidirectional detection of fiber ring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103674083A (en) * | 2013-12-13 | 2014-03-26 | 北京航天时代光电科技有限公司 | High-speed particle impact test system |
| CN106643838A (en) * | 2016-12-01 | 2017-05-10 | 北京航天控制仪器研究所 | Bumping position measuring system and method based on bidirectional detection of fiber ring |
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