CN106643838A - Bumping position measuring system and method based on bidirectional detection of fiber ring - Google Patents
Bumping position measuring system and method based on bidirectional detection of fiber ring Download PDFInfo
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- CN106643838A CN106643838A CN201611092112.XA CN201611092112A CN106643838A CN 106643838 A CN106643838 A CN 106643838A CN 201611092112 A CN201611092112 A CN 201611092112A CN 106643838 A CN106643838 A CN 106643838A
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- 239000000835 fiber Substances 0.000 title claims abstract description 187
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- 230000002457 bidirectional effect Effects 0.000 title abstract 2
- 230000003287 optical effect Effects 0.000 claims abstract description 71
- 230000004044 response Effects 0.000 claims description 54
- 238000012360 testing method Methods 0.000 claims description 29
- 230000008878 coupling Effects 0.000 claims description 16
- 238000010168 coupling process Methods 0.000 claims description 16
- 238000005859 coupling reaction Methods 0.000 claims description 16
- 239000013307 optical fiber Substances 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 11
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- 238000005259 measurement Methods 0.000 description 30
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35341—Sensor working in transmission
- G01D5/35351—Sensor working in transmission using other means to detect the measured quantity
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Abstract
The invention discloses a bumping position measuring system and method based on bidirectional detection of a fiber ring. The system comprises a light source, first, second and third couplers, a sensing fiber, first and second detectors and a processor; the first coupler couples first optical signals output by the first source to obtain second and third optical signals; the first detector receives the third optical signal which is transmitted to the second coupler via the sensing fiber and output, the second detector receives the second optical signal which is transmitted to the third coupler via the sensing fiber and output, and the two detectors detect returned optical signals, and output first and second voltage signals respectively; and the processor determines a bumped position according to the first and second voltage signals. According to the invention, the bumped position of an object to be measured can be measured more rapidly and accurately, the system structure is simplified, the system cost is reduced, and conditions are provided for batch application of schemes.
Description
Technical field
The invention belongs to field of measuring technique, more particularly to a kind of impact site measurement system based on fiber optic loop bi-directional probing
System and method.
Background technology
Guidance precision is the core index of anti-ballistic armament systems, and Guidance Accuracy Evaluation needs to obtain effectively interception test every time
Guidance missdistance data, the key for obtaining its guidance missdistance is to measure the precise location that aircraft is intercepted shock, with reference to interception
The speed of device and aircraft, attitude information, can calculate the relative velocity vector through rum point to the target bullet centre of form
Distance, i.e. guidance missdistance.Therefore, high-precision impact site measurement has a wide range of applications in high-speed aircraft interception test
Demand, can provide key technology and support for anti-ballistic armament systems guidance precision and Damage Effect Assessment.Because aircraft has
Certain flying height, when being subjected to that blocker is crushing to be clashed into aircraft apart from ground telemetering station farther out, and high-speed impact energy
Amount causes greatly aircraft life span short, can only qualitatively judge whether to intercept into by the way of traditional remote measurement or flash ranging
Work(, and the accurate measurement of impact site cannot be realized.In order to realize the accurately quantitative measurment of the impact site to aircraft, generally
Need to carry impact site measuring system on board the aircraft, obtain aircraft in crushing high-speed impact moment and be knocked position
Information, and store in time or pass down in real time by HRT high-rate telemetry.
Both at home and abroad the existing relatively advanced measurement means in target range are difficult to centimetre under the conditions of the hypervelocity impact of high-altitude
Level impact site measurement, such as flash ranging multistation picture miss distance measurement system at same frame, when oblique distance 300km is observed, precision is about
3m, precision further declines when observation oblique distance is farther；Radio Step Frequency broadband miss distance measurement system is not considering bulk effect
In the case of certainty of measurement be about 0.3m；Gao Zhongying narrow-pulse laser range finding miss distance measurement system is not considering bulk effect
In the case of certainty of measurement be about 0.2m；Due to these method response times it is long, therefore be not suitable for longrange interception collision survey
Amount.Additionally, emerging impact site measuring system such as power grid target line rum point measuring system and multiple spot ultrasonic wave rum point are surveyed
Amount system response time, in ten Milliseconds, cannot complete Centimeter Level shock in the system time of most short about ten microsecond
Position measurement task, and electromagnetic interference is easily received, measurement effect is had a strong impact on, even result in measurement failure.And, existing measurement
Also there is many devices, complex structure and relatively costly in scheme.
The content of the invention
The technology solve problem of the present invention：Overcome the deficiencies in the prior art, there is provided a kind of based on fiber optic loop bi-directional probing
Impact site measuring system and method, it is to avoid impact of the electromagnetic interference produced in knockout process to measurement process, while sharp
With photoelectricity high-speed transitions characteristic, the measurement demand under the conditions of crushing shock is adapted to, improve response speed, simplify system knot
Structure, reduces system cost.
In order to solve above-mentioned technical problem, the invention discloses a kind of impact site based on fiber optic loop bi-directional probing is measured
System, the system includes：Light source, the first coupler, the second coupler, the 3rd coupler, sensor fibre, the first detector,
Second detector and processor；
The optical signal of light source output first；
First coupler carries out coupling processing to first optical signal, obtains the second optical signal and the 3rd optical signal, will
Second optical signal is input into second coupler, and the 3rd optical signal is input into the 3rd coupler；
One end of sensor fibre is connected with the output end of second coupler, transmits the of second coupler output
Two optical signals；The other end of sensor fibre is connected with the output end of the 3rd coupler, transmits the 3rd coupler output
The 3rd optical signal；Wherein, the sensor fibre is arranged on the test zone of object to be measured；
First detector via sensor fibre transmission, the 3rd optical signal returned by second coupler to entering
Row detection, according to result of detection first voltage signal is exported；
Second detector via sensor fibre transmission, the second optical signal returned by the 3rd coupler to entering
Row detection, according to result of detection second voltage signal is exported；
Processor determines being impacted for the object to be measured according to the first voltage signal and the second voltage signal
Position.
In the above-mentioned impact site measuring system based on fiber optic loop bi-directional probing, processor is believed according to the first voltage
Number and the second voltage signal, determine the position that is impacted of the object to be measured, including：Processor is according to first voltage signal
With the trailing edge pair that second voltage signal determines respectively the trailing edge of first voltage corresponding first response time and second voltage
The second response time answered；According to first response time and the difference of second response time, with reference to the sensing for arranging
Optical fiber total length determines the fracture position of sensor fibre；According to determine sensor fibre fracture position and sensor fibre to be measured
The set location of the test zone of object, determines the position that is impacted of the object to be measured.
In the above-mentioned impact site measuring system based on fiber optic loop bi-directional probing, processor is according to during the described first response
Between and second response time difference, determine the fracture position of sensor fibre with reference to sensor fibre length, including：Processor
The fracture position of sensor fibre is determined according to equation below：Wherein, L is the test for being arranged on object to be measured
The sensor fibre total length in region, l is the length of the coupler of fracture position distance second of sensor fibre, and Δ t is described first
Response time and the difference of second response time, c is light spread speed in a vacuum, and n is the folding of sensor fibre fibre core
Penetrate rate.
In the above-mentioned impact site measuring system based on fiber optic loop bi-directional probing, the sensor fibre is Z-shaped, according to setting
Determine the test zone that spacing distance is arranged on the object to be measured.
In the above-mentioned impact site measuring system based on fiber optic loop bi-directional probing, light source is LASER Light Source or light-emitting diode
Pipe LED/light source；First detector and the second detector are PIN_FET detectors, or, being avalanche photodide APD detectors；
The responsive bandwidth of the first detector and the second detector is 1MHz～100GHz.
In the above-mentioned impact site measuring system based on fiber optic loop bi-directional probing, when sensor fibre is single-mode fiber,
First coupler, the second coupler and the 3rd coupler are single-mode optical-fibre coupler；When sensor fibre is multimode fibre, first
Coupler, the second coupler and the 3rd coupler are multi-module optical fiber coupler.
In the above-mentioned impact site measuring system based on fiber optic loop bi-directional probing, the system is one or more；Its
In, when the system is two：The second sensor fibre transverse and longitudinal in the first sensor fibre and second system in the first system
Staggeredly, in the latticed test zone for being arranged on object to be measured.
Accordingly, the invention also discloses a kind of impact site measuring method based on fiber optic loop bi-directional probing, the side
Method includes：
Receive the first optical signal of light source output；
Coupling processing is carried out to first optical signal by the first coupler, the second optical signal input that coupling is obtained
To the second coupler, the 3rd optical signal that coupling is obtained is input into the 3rd coupler；
By the first detector to returning by the input of the 3rd coupler, the transmission of Jing sensor fibres and by the second coupler
The 3rd optical signal detected, according to result of detection export first voltage signal；By the second detector to by the second coupling
Device input, the transmission of Jing sensor fibres and the second optical signal by the return of the 3rd coupler are detected, defeated according to result of detection
Go out second voltage signal；Wherein, the two ends of the sensor fibre are connected respectively with the second coupler and the 3rd coupler, the biography
Photosensitive fibre is arranged on the test zone of object to be measured；
According to the first voltage signal and the second voltage signal, the position that is impacted of the object to be measured is determined.
In the above-mentioned impact site measuring method based on fiber optic loop bi-directional probing, according to the first voltage signal and institute
Second voltage signal is stated, the position that is impacted of the object to be measured is determined, including：Believed according to first voltage signal and second voltage
Corresponding second response of the trailing edge of trailing edge corresponding first response time and second voltage of first voltage is determined number respectively
Time；It is true with reference to the sensor fibre total length for arranging according to first response time and the difference of second response time
Determine the fracture position of sensor fibre；According to determine sensor fibre fracture position and sensor fibre in the test section of object to be measured
The set location in domain, determines the position that is impacted of the object to be measured.
In the above-mentioned impact site measuring method based on fiber optic loop bi-directional probing, according to first response time and institute
The difference of the second response time is stated, with reference to the sensor fibre total length for arranging the fracture position of sensor fibre is determined, including；According to
Equation below determines the fracture position of sensor fibre：Wherein, L is the test zone for being arranged on object to be measured
Sensor fibre total length, l for sensor fibre the coupler of fracture position distance second length, Δ t be described first respond
The difference of time and second response time, c is light spread speed in a vacuum, n for sensor fibre fibre core refractive index.
Present invention advantage compared with prior art is：
(1) scheme disclosed by the invention, based on fiber optic loop bi-directional probing the survey at the high-speed impact position to aircraft is realized
Amount, and optical fiber has the advantages that small volume, light weight, intensity are high, is not required to power supply, not receiving Electromagnetic Interference, therefore, institute of the present invention
The scheme stated effectively overcomes the impact of the electromagnetic interference to measurement process of high-speed impact moment generation, it is ensured that measurement it is normal
Carry out and measurement result accuracy.
(2) scheme disclosed by the invention, can be according to the first voltage signal of the first detector output and the second detector
The trailing edge time difference of the second voltage signal of output, with reference to the sensor fibre total length for arranging the damage of sensor fibre is accurately determined
Hinder position；Further, object to be measured can accurately be determined in the installation site of the test zone of object to be measured with reference to sensor fibre
The position that is impacted of (e.g., aircraft), simplifies the structure complexity of system, reduces measurement cost, is the present invention program's
Batch application provides condition.
(3) scheme disclosed by the invention, does not have particular/special requirement to devices such as light source, coupler, detector, sensor fibres,
Make scheme that there is well compatibility, beneficial to promoting on a large scale.
Description of the drawings
Fig. 1 is a kind of structural representation of the impact site measuring system based on fiber optic loop bi-directional probing in the embodiment of the present invention
Figure；
Fig. 2 is a kind of layout diagram of sensor fibre in the embodiment of the present invention；
The step of Fig. 3 is a kind of impact site measuring method based on fiber optic loop bi-directional probing in embodiment of the present invention flow process
Figure.
Specific embodiment
It is public to the present invention below in conjunction with accompanying drawing to make the object, technical solutions and advantages of the present invention clearer
Embodiment is described in further detail.
With reference to Fig. 1, a kind of impact site measuring system based on fiber optic loop bi-directional probing in the embodiment of the present invention is shown
Structural representation.In the present embodiment, the impact site measuring system system based on fiber optic loop bi-directional probing includes：Light
Source 1, the first coupler 201, the second coupler 202, the 3rd coupler 203, sensor fibre 3, the first detector 401, second are visited
Survey device 402 and processor 5.Wherein, the output end of the first coupler 201 respectively with the input and the 3rd of the second coupler 202
The input connection of coupler 203；The output end of second coupler 202 is connected with one end of sensor fibre 3, and the described 3rd
The output end of coupler 203 is connected with the other end of sensor fibre 3, and sensor fibre 3 is located at the second coupler 202 and the 3rd coupling
Between device 203, an optical fiber ring structure is constituted；The output end of the input of the first detector 401 and the second coupler 202 connects
Connect；The input of the second detector 402 is connected with the output end of the 3rd coupler 203；Processor 5 respectively with the first detector
The output end connection of 401 output end and second detector 402.
In the present embodiment, each part in the impact site measuring system based on fiber optic loop bi-directional probing is concrete
Using as follows：
Light source 1 exports the first optical signal.
In the present embodiment, the light source 1 can with but be not limited only to as：LASER Light Source or Light-Emitting Diode LED (Light
Emitting Diode) light source.
First coupler 201 pairs, first optical signal carries out coupling processing, obtains the second optical signal and the 3rd optical signal,
Second optical signal is input into second coupler 202, the 3rd optical signal is input into the 3rd coupler
203。
One end of sensor fibre 3 is connected with the output end of second coupler 202, transmits second coupler 202
Second optical signal of output；The other end of sensor fibre 3 is connected with the output end of the 3rd coupler 203, transmits described the
3rd optical signal of the output of three coupler 203.
First detector 401 pairs transmits via the sensor fibre 3, returned by second coupler 202 the 3rd
Optical signal is detected, and according to result of detection first voltage signal is exported.
Second detector 402 pairs transmits via the sensor fibre 3, returned by the 3rd coupler 203 second
Optical signal is detected, and according to result of detection second voltage signal is exported.
In the present embodiment, the first optical signal of the output of light source 1 is divided into two ways of optical signals at the first coupler 201
(the second optical signal and the 3rd optical signal), two ways of optical signals respectively through the second coupler 202 and the coupling of the 3rd coupler 203 at
Incide the two ends of sensor fibre 3 after reason, two ways of optical signals transmit in sensor fibre 3 after respectively from the opposite end of sensor fibre 3
Outgoing, the two ways of optical signals of outgoing is incident to respectively the first detector 401 Jing after the second coupler 202 and the 3rd coupler 203
With the second detector 402, the first detector 401 and the second detector 402 can change to the break-make of the two ways of optical signals of outgoing
Detected, voltage signal is converted optical signals to according to result of detection.For example, when sensor fibre 3 is subject to clash into fracture, pass
Optical signal in photosensitive fine 3 will appear from from having light to unglazed change, and the first detector 401 and the second detector 402 can be with
This change is detected, and then, when voltage signal output is converted optical signals to, the voltage signal of output is in the time location
There is a trailing edge from (optical signal from have light to unglazed).
Processor 5 determines being hit for the object to be measured according to the first voltage signal and the second voltage signal
Hit position.
In the present embodiment, sensor fibre 3 is arranged on the test zone of object to be measured, when crash occurs, processes
Device 5 can be according to the first voltage signal and the second voltage signal trailing edge time difference, with reference to the sensor fibre 3 for arranging
Total length determines the position that is impacted of the object to be measured.Specifically,
Processor 5 determines respectively the trailing edge of first voltage corresponding according to first voltage signal and second voltage signal
Trailing edge corresponding second response time of one response time and second voltage；According to first response time and described second
The difference of response time, with reference to the sensor fibre total length for arranging the fracture position of sensor fibre 3 is determined.As it was previously stated, when biography
It is photosensitive it is fine by 3 to clash into rupture when, the optical signal in sensor fibre 3 will appear from from having light to unglazed change, two-way detector
Output voltage signal in will have an obvious trailing edge change, due to rupturing moment in sensor fibre 3, optical signal is still
Can propagate in sensor fibre 3, optical signal has a fixed response time from the time that impingement position travels to two detectors, because
This, by the trailing edge in the first voltage signal for detecting the output of the first detector and the second voltage letter of the second detector output
The response time of the trailing edge in number is poor, in combination with transmission speed of the optical signal in sensor fibre 3 and be arranged on it is to be measured right
The sensor fibre total length of the test zone of elephant, you can to calculate the fracture position of sensor fibre 3.Specifically, can basis
Equation below calculates the fracture position of sensor fibre 3：
Wherein, L is the total length of the sensor fibre 3 for arranging, and l is the coupler of fracture position distance second of sensor fibre 3
402 length, Δ t is the difference of first response time and second response time, and c is light propagation speed in a vacuum
Degree, n is the refractive index of the fibre core of sensor fibre 3.
It should be noted that the sensor fibre 3 can be arranged on the test zone of object to be measured, when it is determined that sensor fibre
After 3 fracture position, processor 5 can be according to the fracture position of the sensor fibre 3 for determining and sensor fibre 3 in object to be measured
Test zone set location, determine the position that is impacted of the object to be measured.
In a preferred version of the present embodiment, as it was previously stated, the system described in the present embodiment is by detecting to two-way
Response time of trailing edge in the voltage signal of device output is analyzed, and determines the delay inequality of trailing edge, and based on a determination that
Delay inequality is calculating impingement position.It can be seen that, the accuracy of delay inequality will directly affect the standard of final calculated impingement position
True property, therefore, in order to more accurately obtain delay inequality, realization is more accurately judged impact site, can be to two-way detector
Input optical power be controlled so that the incident optical power approximately equal of two-way detector.In order to realize two-way detector
Incident optical power approximately equal, can be 50 from splitting ratio：50 coupler respectively as above-mentioned first coupler 201,
Two couplers 202 and electric coupler 203.
In a preferred version of the present embodiment, for the trailing edge in the voltage signal for ensureing the output of two-way detector
Response amplitude and slope, can select total null voltage and the approximate two consistent detectors of the linearity to visit respectively as above-mentioned first
Survey the detector 402 of device 401 and second, and then, when incide the optical signal of detector from have to it is unchanged when, two-way detector
Output voltage fall and slope are approximately consistent, are conducive to the extraction of delay inequality.For example, first detector 401 and
Two detectors 402 can be PIN_FET detectors；Or, being avalanche photodide APD (Avalanche Photo Diode)
Detector.
In a preferred version of the present embodiment, in order to ensure that system has higher response sensitivity, can be from sound
Should be with the detector of a width of 1MHz～100GHz (including 1MHz and 100GHz) respectively as above-mentioned first detector 401 and second
Detector 402.Wherein, the occurrence of responsive bandwidth can determine according to the positioning precision demand of system, in general, response
Bandwidth is wider, and the DELAY RESPONSE sensitivity of detector is higher, and the positioning precision of system is also higher.
In a preferred version of the present embodiment, when sensor fibre 3 is single-mode fiber, first coupler 201, the
Two couplers 202 and the 3rd coupler 203 is then corresponding is single-mode optical-fibre coupler.When sensor fibre 3 is multimode fibre,
First coupler 201, the second coupler 202 and the 3rd coupler 203 is then corresponding is multi-module optical fiber coupler.
In a preferred version of the present embodiment, the concrete length of the sensor fibre 3 according to the area of test zone and
Fiber deployment density determines that sensor fibre 3 can be laid in test zone by modes such as pre-buried or surface mounts.For example, institute
The length for stating sensor fibre 3 can be for 1m～1km (including 1m and 1km), and the sensor fibre 3 is Z-shaped, according to setting spacer
From the test zone for being arranged on the object to be measured.
It should be noted that as shown in figure 1, the sensor fibre 3 at impingement position A ruptures, as it was previously stated, processor
5 can determine delay inequality according to the voltage signal of two-way detector output, and then calculate the fracture position for determining sensor fibre 3.
However, because the responsive bandwidth of detector can cause certain time delay error, this will cause by the system described in the present embodiment
There is certain fluctuation range with the actual crack position of sensor fibre 3 in the fracture position of calculated sensor fibre 3.Example
Such as, the responsive bandwidth in detector is that system positioning result there may be the fluctuation of 10cm under conditions of 1GHz.Therefore, in reality
In the application of border, in order to further improve the fast and accurately measurement to the position that is impacted, can will be above-mentioned two-way based on fiber optic loop
The impact site measuring system of detection is used in combination two-by-two.
In the present embodiment, the impact site measuring system based on fiber optic loop bi-directional probing can be one or many
It is individual.When the impact site measuring system based on fiber optic loop bi-directional probing is two, with reference to Fig. 2, show of the invention real
Apply a kind of layout diagram of sensor fibre in example；Wherein, in the first sensor fibre 301 and second system in the first system
The transverse and longitudinal of second sensor fibre 302 staggeredly, in the latticed test zone for being arranged on object to be measured.
When object to be measured is subject to extraneous shock, the sensor fibre (He of the first sensor fibre 301 at impingement position B
Second sensor fibre 302) will rupture.Now, the corresponding system of the first sensor fibre 301 can be to first sense light
Fine 301 fracture position is calculated；The corresponding system of second sensor fibre 302 can be to second sensor fibre 302
Fracture position is calculated.As previously mentioned, it is contemplated that the time delay error that the responsive bandwidth of detector is brought, for the first sense light
Fine 301, it is assumed that system positioning result is in the scope shown in J1；For the second sensor fibre 302, it is assumed that system positioning result exists
In scope shown in W1.Then, by the uniqueness of optical fiber intersection point, the coordinate of impingement position B can be obtained, effectively increases measurement knot
The accuracy of fruit.
, wherein it is desired to explanation, using the longitude and latitude of double optical fiber (the first sensor fibre 301 and the second sensor fibre 302)
The position error that the uniqueness of intersection point carries out system positioning is relevant with the layout density of sensor fibre.Maximum positioning error is sensing
Optical fiber longitude and latitude layout densityTimes, i.e., when the cloth of sensor fibre (the first sensor fibre 301 and the second sensor fibre 302)
If spacing is d, the positioning precision of system can reach
In sum, a kind of impact site measuring system based on fiber optic loop bi-directional probing described in the embodiment of the present invention,
The loop structure formed based on the second coupler, sensor fibre and the 3rd coupler carries out bi-directional probing, is visited by analyzing two-way
The response delay of the trailing edge of the voltage surveyed in the voltage signal of device output is poor, and it is right to realize with reference to the sensor fibre total length for arranging
The impact site of object to be measured is measured, and is effectively simplified the structure complexity and system cost of system.Meanwhile, overcome height
Speed clashes into impact of the electromagnetic interference to measurement process for producing moment, it is ensured that measurement be normally carried out and measurement result standard
True property.
Secondly, the system described in the embodiment of the present invention is to the no spy of the devices such as light source, coupler, detector, sensor fibre
It is different to require, make scheme that there is compatibility well, beneficial to promoting on a large scale.
Further, in practical application, between multiple systems can with work compound, such as by the sense light of two systems
Fibre is intersected by " Z " font to be laid, and the fast and accurately measurement of the impact site to object to be measured is greatly improved.
Based on same inventive concept, the impact site based on fiber optic loop bi-directional probing described in the present embodiment is measured below
Method is illustrated.With reference to Fig. 3, show that a kind of impact site based on fiber optic loop bi-directional probing is measured in the embodiment of the present invention
The step of method flow chart.In the present embodiment, the impact site measuring method based on fiber optic loop bi-directional probing, including：
Step 302, receives the first optical signal of light source output.
Step 304, coupling processing is carried out by the first coupler to first optical signal, the second light that coupling is obtained
Signal input is input into the 3rd optical signal that coupling is obtained to the 3rd coupler to the second coupler.
Step 306, by the first detector to by the input of the 3rd coupler, the transmission of Jing sensor fibres and by the second coupling
The 3rd optical signal that clutch is returned is detected, and according to result of detection first voltage signal is exported；By the second detector to by
The input of second coupler, the transmission of Jing sensor fibres and the second optical signal by the return of the 3rd coupler are detected, according to spy
Survey result output second voltage signal.
In the present embodiment, the two ends of the sensor fibre are connected respectively with the second coupler and the 3rd coupler, described
Sensor fibre is arranged on the test zone of object to be measured.
Step 308, according to the first voltage signal and the second voltage signal, determines being hit for the object to be measured
Hit position.
In the present embodiment, can be according to the first voltage signal and the trailing edge time of the second voltage signal
Difference, with reference to the sensor fibre total length for arranging the position that is impacted of the object to be measured is determined.Specifically：Believed according to first voltage
Number and second voltage signal determine the trailing edge of the trailing edge of first voltage corresponding first response time and second voltage respectively
Corresponding second response time；According to first response time and the difference of second response time, with reference to the biography for arranging
Photosensitive fine total length determines the fracture position of sensor fibre；Treated according to the fracture position and sensor fibre of the sensor fibre for determining
The set location of the test zone of object is surveyed, the position that is impacted of the object to be measured is determined.
Preferably, the fracture position of sensor fibre can be determined according to equation below：
Wherein, L is the sensor fibre total length for arranging, and l is the length of the coupler of fracture position distance second of sensor fibre
Degree, Δ t is the difference of first response time and second response time, and c is light spread speed in a vacuum, and n is
The refractive index of the fibre core of sensor fibre 3.
In sum, a kind of impact site measuring method based on fiber optic loop bi-directional probing described in the embodiment of the present invention,
The loop structure formed based on the second coupler, sensor fibre and the 3rd coupler carries out bi-directional probing, is visited by analyzing two-way
The response delay of the trailing edge of the voltage surveyed in the voltage signal of device output is poor, realizes surveying the impact site of object to be measured
Amount, is effectively simplified the structure complexity and system cost of system.Meanwhile, overcome the electromagnetic interference of high-speed impact moment generation
Impact to measurement process, it is ensured that measurement be normally carried out and measurement result accuracy.
The above, optimal specific embodiment only of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
All should be included within the scope of the present invention.
The content not being described in detail in description of the invention belongs to the known technology of professional and technical personnel in the field.
Claims (10)
1. a kind of impact site measuring system based on fiber optic loop bi-directional probing, it is characterised in that the system includes：Light source,
First coupler, the second coupler, the 3rd coupler, sensor fibre, the first detector, the second detector and processor；
The optical signal of light source output first；
First coupler carries out coupling processing to first optical signal, obtains the second optical signal and the 3rd optical signal, will be described
Second optical signal is input into second coupler, and the 3rd optical signal is input into the 3rd coupler；
One end of sensor fibre is connected with the output end of second coupler, transmits the second light of the second coupler output
Signal；The other end of sensor fibre is connected with the output end of the 3rd coupler, transmits the of the 3rd coupler output
Three optical signals；Wherein, the sensor fibre is arranged on the test zone of object to be measured；
First detector via sensor fibre transmission, the 3rd optical signal returned by second coupler to visiting
Survey, first voltage signal is exported according to result of detection；
Second detector via sensor fibre transmission, the second optical signal returned by the 3rd coupler to visiting
Survey, second voltage signal is exported according to result of detection；
Processor determines the portion that is impacted of the object to be measured according to the first voltage signal and the second voltage signal
Position.
2. system according to claim 1, it is characterised in that processor is according to the first voltage signal and described second
Voltage signal, determines the position that is impacted of the object to be measured, including：
Processor determines respectively corresponding first sound of the trailing edge of first voltage according to first voltage signal and second voltage signal
With trailing edge corresponding second response time of second voltage between seasonable；According to first response time and second response
The difference of time, with reference to the sensor fibre total length for arranging the fracture position of sensor fibre is determined；According to the sensor fibre for determining
Fracture position and sensor fibre in the set location of the test zone of object to be measured, determine the portion that is impacted of the object to be measured
Position.
3. system according to claim 2, it is characterised in that processor is according to first response time and described second
The difference of response time, with reference to the sensor fibre total length for arranging the fracture position of sensor fibre is determined, including：
Processor determines the fracture position of sensor fibre according to equation below：
Wherein, L is the sensor fibre total length of the test zone for being arranged on object to be measured, l for sensor fibre fracture position away from
From the length of the second coupler, Δ t is the difference of first response time and second response time, and c is light in vacuum
In spread speed, n for sensor fibre fibre core refractive index.
4. system according to claim 1, it is characterised in that the sensor fibre is Z-shaped, set according to setting spacing distance
Put the test zone in the object to be measured.
5. system according to claim 1, it is characterised in that
Light source is LASER Light Source or Light-Emitting Diode LED/light source；
First detector and the second detector are PIN_FET detectors, or, being avalanche photodide APD detectors；
The responsive bandwidth of the first detector and the second detector is 1MHz～100GHz.
6. system according to claim 1, it is characterised in that
When sensor fibre is single-mode fiber, the first coupler, the second coupler and the 3rd coupler are single-mode optical-fibre coupler；
When sensor fibre is multimode fibre, the first coupler, the second coupler and the 3rd coupler are multi-module optical fiber coupler.
7. system according to claim 1, it is characterised in that the system is one or more；
Wherein, when the system is two：
The first sensor fibre in the first system staggeredly, in latticed is arranged on the second sensor fibre transverse and longitudinal in second system
The test zone of object to be measured.
8. a kind of impact site measuring method based on fiber optic loop bi-directional probing, it is characterised in that methods described includes：
Receive the first optical signal of light source output；
Coupling processing is carried out to first optical signal by the first coupler, the second optical signal for obtaining of coupling is input into the
Two couplers, the 3rd optical signal that coupling is obtained is input into the 3rd coupler；
By the first detector to return by the input of the 3rd coupler, the transmission of Jing sensor fibres and by the second coupler the
Three optical signals are detected, and according to result of detection first voltage signal is exported；By the second detector to defeated by the second coupler
Enter, the transmission of Jing sensor fibres and the second optical signal for being returned by the 3rd coupler are detected, according to result of detection output the
Two voltage signals；Wherein, the two ends of the sensor fibre are connected respectively with the second coupler and the 3rd coupler, the sense light
Fibre is arranged on the test zone of object to be measured；
According to the first voltage signal and the second voltage signal, the position that is impacted of the object to be measured is determined.
9. method according to claim 8, it is characterised in that believed according to the first voltage signal and the second voltage
Number, determine the position that is impacted of the object to be measured, including：
The trailing edge of first voltage corresponding first response time is determined respectively according to first voltage signal and second voltage signal
The second response time corresponding with the trailing edge of second voltage；
According to first response time and the difference of second response time, determine with reference to the sensor fibre total length for arranging
The fracture position of sensor fibre；
According to determine sensor fibre fracture position and sensor fibre the test zone of object to be measured set location, it is determined that
The position that is impacted of the object to be measured.
10. method according to claim 9, it is characterised in that according to first response time and second response
The difference of time, with reference to the sensor fibre total length for arranging the fracture position of sensor fibre is determined, including；
The fracture position of sensor fibre is determined according to equation below：
Wherein, L is the total length of the sensor fibre of the test zone for being arranged on object to be measured, and l is the fracture position of sensor fibre
The length of the coupler of distance second, Δ t is the difference of first response time and second response time, and c is light true
Aerial spread speed, n is the refractive index of sensor fibre fibre core.
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| CN107576956A (en) * | 2017-07-31 | 2018-01-12 | 北京航天控制仪器研究所 | A kind of damage reason location system of the forward and reverse detection of fluorescence optical fiber |
| CN113533345A (en) * | 2021-07-05 | 2021-10-22 | 浙江大学 | Object surface fracture position real-time monitoring system and method based on optical fiber |
| CN114234829A (en) * | 2021-11-30 | 2022-03-25 | 山东航天电子技术研究所 | Spacecraft impact monitoring and impact part shape reconstruction system and method |
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| CN114234829A (en) * | 2021-11-30 | 2022-03-25 | 山东航天电子技术研究所 | Spacecraft impact monitoring and impact part shape reconstruction system and method |
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