CN107063634B - A kind of system using energy method rapid survey fiber exit coke ratio - Google Patents
A kind of system using energy method rapid survey fiber exit coke ratio Download PDFInfo
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- CN107063634B CN107063634B CN201710128176.9A CN201710128176A CN107063634B CN 107063634 B CN107063634 B CN 107063634B CN 201710128176 A CN201710128176 A CN 201710128176A CN 107063634 B CN107063634 B CN 107063634B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
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Abstract
The invention belongs to optic fibre characteristic fields of measurement, specially a kind of system using energy method rapid survey fiber exit coke ratio.The present invention sets the corresponding energy accounting of fiber exit coke ratio, then measures fiber exit gross energy, and diaphragm is recycled to limit transmitted light intensity, and making the ratio between diaphragm transmitted light intensity and fiber exit total light intensity is particular energy accounting；Stop position, and the corresponding change aperture of the diaphragm are moved along fiber exit optical axis, the aperture of the diaphragm and position are subjected to linear fit, the slope of straight line is the fiber exit coke ratio for setting energy accounting.A kind of system using energy method rapid survey fiber exit coke ratio of the invention, spot size size is fitted without the method for Computer Image Processing, without measurement CCD at a distance from fiber exit end, directly utilize energy method, by the control aperture of the diaphragm and position, the fiber exit coke ratio of any setting energy accounting is obtained.
Description
Technical field
It is specially a kind of using energy method rapid survey fiber exit coke ratio the invention belongs to optic fibre characteristic fields of measurement
System.
Background technique
Fiber exit coke ratio measures optical fiber celestial spectrum most important.Telescopic system is towards heavy caliber, big now
The direction of visual field is developed, and bore is bigger, and the cosmic space of detection is deeper, and the celestial body observed is also more.In the day of early stage
In text observation, telescope can only once observe a target celestial body spectrum, after fiber optic applications to the telescopic system eighties,
The multiple target spectrum observation technology that multiple targets can be observed simultaneously greatly improves observed efficiency.General multiple target spectrum is seen
The one-dimensional spectral information for mainly obtaining target is surveyed, and optical fiber uses in integral field unit (IFU) technology, can obtain three
Tie up spectrum, i.e., simultaneously obtain target two-dimensional position information and one-dimensional spectral information.Optical fiber becomes a kind of important optical transport Jie
Matter has the function of the observation of telescope very crucial.Light from starry sky is very weak, and starlight focuses on telescope
On focal plane, then coupling enters optical fiber and is transferred in spectrometer or other optical systems again.Effectively guidance starlight enters spectrum
In the optical fiber of astronomical telescope, the utilization rate for improving light has very important meaning to spectrum analysis.In telescopic system, light
Fine quantity can achieve several hundred or even thousands of magnitudes, therefore the transmission characteristic of optical fiber and parameters are all to entire telescope
System has a major impact.Measure optical fiber pass the most important factor of light quality there are two: one be optical fiber spectral transmittance, also
One be exactly optical fiber focal ratio degradation characteristic.
Fiber spectrum transmitance directly affects the efficiency of transmission of optical fiber, and the wavelength band covering in astronomical observation is wide, therefore
Optical fiber is needed to be able to satisfy in broadband wide spectrum high transmission rates.In addition to the transmitance of optical fiber itself, optical fiber coupled light and optical fiber
The utilization of emanated energy also influences whether efficiency of transmission.Coke ratio is introduced to the description of optical fiber incident light and emergent light in astronomy
Concept.For convex lens ideal for one, when directional light is parallel to primary optical axis incidence, emergent light converges to focus, goes out at this time
The coke ratio F for penetrating light is defined as the ratio of the focal length f of lens and the bore D of lens:
F/#=f/D
In a fiber, the coke ratio for defining fiber exit end is optical fiber end spot diameter at a distance from receiving plane and on receiving plane
Ratio.
F/#=L/D
The straight optical fiber of perfect condition that is, incident coke ratio and can be gone out with the outgoing of identical subtended angle with the light of certain subtended angle incidence
It is identical to penetrate coke ratio.And actual fiber emergent light is because outgoing subtended angle can be than entering caused by bending, stress, defective workmanship of optical fiber etc.
The subtended angle for penetrating light is big, i.e., at away from fiber end face same distance position, the diameter of emergent light spot can be bigger than launching spot, then going out
It is smaller than incident coke ratio to penetrate coke ratio, this effect is known as focal ratio degradation (focal ratio degradation, FRD).Optical fiber is burnt
Two parts can be divided on the main influence of astronomical telescope than degenerating, a part is the reduction of capacity usage ratio, another part
It is the increase of the design difficulty and cost of telescopic system.Since focal ratio degradation shows as increasing the diameter of fiber exit hot spot,
This dissipates hot spot more, the distribution of the decrease of power density, and under conditions of identical bore, the light energy that can be collected into can be into one
Step reduces, simultaneously because daylight itself is very faint, focal ratio degradation can further decrease utilization rate.On the other hand, focal ratio degradation meeting
The angle of divergence for increasing emergent light, so that the design of rear end spectrometer and the difficulty of imaging system design and increased costs.To light
Fine focal ratio degradation characteristic, which carries out research, facilitates Curve guide impeller spectroscopic analysis system.
The determination of optical fiber incidence coke ratio is more convenient, can directly using incidence end aperture diaphragm apart from optical fiber incidence end away from
From determining with aperture diaphragm diameter ratio.And the outgoing coke ratio measurement at fiber exit end is relatively complicated, because of emergent light
Similar to Gaussian Profile, the not stringent boundary of hot spot, therefore how to determine that spot size is also an important process.From reality
It sets out, the biggish region of energy density is concentrated mainly on for the energy utilization of emergent light, therefore in an experiment or telescope
Design in also mainly consider the spot size that can efficiently use of emergent light spot.Convention is using energy accounting both at home and abroad at present
(it is total to account for hot spot with the energy for being included in the circle of certain radius that is, using light spot energy mass center as the center of circle by Encircled Energy
The ratio of energy.Such as round self-energy accounts for hot spot gross energy 90%, then be EE90, and so on) measure fiber exit coke ratio.It is logical
EE90 or EE95 is often chosen, can both compare the actual facula size for the calculating emergent light spot approached, and can also be effectively reduced
The influence of measuring system dark current and noise.
The method of test coke ratio mainly shoots hot spot by CCD both at home and abroad at present, then carries out Gauss curve fitting to hot spot,
Outgoing spot diameter is calculated using the EE of different proportion, and then obtains the outgoing coke ratio of optical fiber.According to the difference of incident condition,
Coke ratio measurement method is broadly divided into two kinds.First is that using light cone incidence, fiber exit hot spot is the light cone of a class Gauss, away from
Emergent light spot is shot as the position of focal length with a certain distance from fiber exit end, the hot spot then calculated under certain proportion EE is straight
Diameter, then calculate the ratio of focal length and diameter and obtain outgoing coke ratio (GerardoAvila, Paul Singh, Maja
Albertsen.Photometrical scrambling gain and focal ratio degradation in fibers
For astronomical instruments.Proc.of SPIE Vol.6269 62695O-1,2006. or Jeremy
D.Murphy,Phillip J.MacQueen,Gary J.Hill,Frank Grupp,Andreas Kelz,
PovilasPalunas,Martin Roth,Alexander Fry.Focal Ratio Degradation and
Transmission in VIRUS-P Optical Fibers.Proc.of SPIE Vol.7018 70182T-1,2008.)。
Second is that using Spot incident or using collimated light incident with certain inclination angle, the light of a certain determining incident coke ratio is replaced with this
Line, fiber exit are Spot, and the diameter calculation of Spot uses the extension of FWHM generally to indicate the ring of light relative to incident light
The variation at inclination angle, or be converted into the diameter of the ring of light come calculate outgoing coke ratio (Daniel Finstad, EdwardWishnow,
ClairePoppett,MartinSirk,Jerry Edelstein,Steve Gibson,Geoff Marcy,and Andrew
Howard.Collimated focal ratio degradation testing for highly multiplexed
fiber systems-an improvement to a standard test.Applied Optics,Vol.55,No.25,
2016. or Dionne M.Haynes, Michael J.Withford, Judith M.Dawes, Roger Haynes, Joss
Bland-Hawthorn.Focal Ratio Degradation:Anew perspective.Proc.of SPIE Vol.7018
70182U-1,2008.)。
Above method has certain limitation, for example hot spot is chosen and shot to the method for calculating spot size how
Focometry of number of samples and hot spot sampled point etc. has a significant impact to the precision of result, under normal circumstances, accurately measures CCD
Distance of the image planes away from fiber exit end is highly difficult.In addition, when the focal length range of sampled point is shorter, the mistake of measurement result
Difference also will increase.When using laser light incident, since there are laser speckle, the hot spot figure contrasts of CCD shooting for fiber exit spot
Height, calculate different proportion EE energy determined by diameter when as speckle violent fluctuation and generate error.Meanwhile light
Source stability is also an error source, and for CCD when shooting different hot spots, the fluctuation of light source can allow the Energy distribution of hot spot to generate
Variation, then directly error can be also generated using the hot spot calculated diameter of shooting.
In addition, the processing method of these methods is slow, luminosity compensation is difficult, is unfavorable for rapid survey.
Summary of the invention
The purpose of the present invention is to provide a kind of systems using energy method rapid survey fiber exit coke ratio.
The object of the present invention is achieved like this:
A kind of system using energy method rapid survey fiber exit coke ratio, the corresponding energy of setting fiber exit coke ratio account for
Than then measuring fiber exit gross energy, recycling diaphragm to limit transmitted light intensity, make diaphragm transmitted light intensity and the total light of fiber exit
The ratio between strong is particular energy accounting；Stop position, and the corresponding change aperture of the diaphragm are moved along fiber exit optical axis, by the aperture of the diaphragm
Linear fit is carried out with position, the slope of straight line is the fiber exit coke ratio for setting energy accounting.
It is inserted into spectroscope in the optical path of light outgoing, reference beam and tested light beam is obtained, measures the light intensity of reference beam
As reference value, the total light intensity for measuring tested light beam is used as measurement total light intensity, and diaphragm transmitted light intensity and measurement are with always when measurement
The ratio between light intensity is setting energy accounting, is used to correct fiber exit total light intensity fluctuation bring measurement error with reference to light intensity.
The beneficial effects of the present invention are:
A kind of system using energy method rapid survey fiber exit coke ratio of the invention, without Computer Image Processing
Method is fitted spot size size, without measurement CCD at a distance from fiber exit end, directly utilizes energy method, leads to
The control aperture of the diaphragm and position are crossed, the fiber exit coke ratio of any setting energy accounting is obtained.
Spectroscope is added in a kind of system using energy method rapid survey fiber exit coke ratio of the invention, fiber exit end
The emergent light of exit end is divided into two beams, the compensation fluctuated to energy of light source is realized, overcomes the unstability and routine of light source
Bring measurement error when method measurement is different.
A kind of system using energy method rapid survey fiber exit coke ratio of the invention can both measure independent single light
Fine outgoing coke ratio, and microlens array can be measured and add simple optical fiber coke ratio in IFU made of fiber optic bundle.
A kind of system using energy method rapid survey fiber exit coke ratio of the invention, it is easy to operate, it is convenient and efficient, and
It is easily achieved, is suitble to promote the use of.
Detailed description of the invention
Fig. 1 is work system light path schematic diagram of the present invention.
Fig. 2 is that work system of the present invention measures fiber exit coke ratio flow chart.
Specific embodiment
The present invention is further detailed with reference to the accompanying drawing:
A kind of system using energy method rapid survey fiber exit coke ratio, the first corresponding energy of setting fiber exit coke ratio
Measuring accounting, (Encircled Energy is accounted for that is, using light spot energy mass center as the center of circle with the energy for being included in the circle of certain radius
The ratio of hot spot gross energy.Such as round self-energy accounts for hot spot gross energy 90%, then is EE90, and so on), it then measures optical fiber and goes out
Firing association's energy recycles diaphragm to limit transmitted light intensity, and making the ratio between diaphragm transmitted light intensity and fiber exit total light intensity is particular energy
Accounting.Stop position, and the corresponding change aperture of the diaphragm are moved along fiber exit optical axis, the aperture of the diaphragm and position are subjected to Linear Quasi
It closes, the slope of straight line is the fiber exit coke ratio for setting energy accounting.
It is inserted into spectroscope in fiber exit optical path, obtains reference beam and tested light beam.Measure the light intensity of reference beam
As reference value, the total light intensity for measuring tested light beam is used as measurement total light intensity, and diaphragm transmitted light intensity and measurement are with always when measurement
The ratio between light intensity is setting energy accounting.It is used to correct fiber exit total light intensity fluctuation bring measurement error with reference to light intensity.
Diaphragm diameter is controlled and read using electronic diaphragm, can control and read diaphragm position with motorized precision translation stage
It sets, reduces measurement error while improving measuring speed.
Corresponding energy accounting (the Encircled Energy, i.e., with light spot energy mass center of setting fiber exit coke ratio first
For the center of circle, the ratio of hot spot gross energy is accounted for the energy for being included in the circle of certain radius.Such as round self-energy accounts for hot spot gross energy
90%, then it is EE90, and so on), fiber exit gross energy is then measured, recycles diaphragm to limit transmitted light intensity, makes diaphragm
The ratio between transmitted light intensity and fiber exit total light intensity are particular energy accounting.Stop position is moved along fiber exit optical axis, and corresponding
Change the aperture of the diaphragm, the aperture of the diaphragm and position is subjected to linear fit, the slope of straight line is that the optical fiber of setting energy accounting goes out
Penetrate coke ratio.
In order to compensate for the fluctuation of light intensity, it is inserted into spectroscope in fiber exit optical path, obtains reference beam and tested light beam.
The light intensity for measuring reference beam is used as reference value, and measurement is tested the total light intensity of light beam as measurement total light intensity, diaphragm when measurement
The ratio between transmitted light intensity and measurement total light intensity are setting energy accounting.It is used to correct fiber exit total light intensity wave zone with reference to light intensity
The measurement error come.
Using electronic diaphragm and motorized precision translation stage measurement error can be reduced while improving measuring speed.
Technical solution used in the present invention is: a spectroscope placed at fiber exit end, and emergent light spot is divided into two beams,
Respectively with the energy of two photodetector real-time detection two-beams.Reflected light is fluctuated for compensatory light, and transmitted light is along optical fiber
Emergent light axis places a diaphragm, and optical fiber is measured in different-energy by the control aperture of the diaphragm and position in mobile stop position
Stop position and diaphragm diameter are carried out linear fit by the outgoing coke ratio under ratio, and the slope of fitting a straight line is emitted coke ratio.It can
Diaphragm diameter is controlled and read using electronic diaphragm, stop position can be controlled and read with motorized precision translation stage.
Fig. 1 is work system light path schematic diagram of the present invention.Wherein 1 be tested optical fiber, 2 be micro-displacement platform and fiber clamp, 3
It is lens for spectroscope, 4,7,5,8 be photodetector, and 6 be adjustable diaphragm, and 9 be data processing platform (DPP).Tested optical fiber 1 goes out
It penetrates in the fiber clamp 2 that end is placed on micro-displacement platform, the light of fiber exit is divided into two beams by spectroscope 3, respectively thoroughly
Light and reflected light are penetrated, transmitted light passes through adjustable diaphragm 6 and lens 7, and reflected light passes through lens 4, and two-beam is respectively by photoelectricity later
Detector 5,8 receives.The numerical value of the position of adjustable diaphragm 6 and aperture information and two photodetectors 5,8 is all by data processing
Platform 9 (such as computer, microcontroller) is handled.If it is using electronic diaphragm and motorized precision translation stage, then data processing
Center can export control signal.
Fig. 2 is that work system of the present invention measures fiber exit coke ratio flow chart.When adjustable diaphragm 6 is not added in measurement first, light
The 8 received total light intensity I of institute of electric explorer0The reference light intensity I that photodetector 5 is received at this timer, the ratio k that both obtains=
I0/Ir, this numerical value is only related with spectroscopical beam intensity ratio, unrelated with fiber exit light intensity.An ability accounting value is set, such as
EE90, is added adjustable diaphragm 6, and the control aperture of the diaphragm makes diaphragm transmitted light intensity ItWith total light intensity I0The ratio between for setting energy accounting, such as
90%.Mobile stop position, controls the aperture of the diaphragm again, meets It=I0EE=kIr·EE.By stop position and aperture
Diameter carries out linear fit, and slope is fiber exit coke ratio.
Claims (2)
1. a kind of system using energy method rapid survey fiber exit coke ratio, it is characterised in that: setting fiber exit coke ratio pair
Then the energy accounting answered measures fiber exit gross energy, recycle diaphragm to limit transmitted light intensity, make diaphragm transmitted light intensity and light
The ratio between fibre outgoing total light intensity is particular energy accounting；Stop position, and the corresponding change aperture of the diaphragm are moved along fiber exit optical axis,
The aperture of the diaphragm and position are subjected to linear fit, the slope of straight line is the fiber exit coke ratio for setting energy accounting.
2. a kind of system using energy method rapid survey fiber exit coke ratio according to claim 1, it is characterised in that:
It is inserted into spectroscope in the optical path of light outgoing, obtains reference beam and tested light beam, measures the light intensity of reference beam as reference
Value, the total light intensity for measuring tested light beam are used as measurement total light intensity, diaphragm transmitted light intensity and measurement the ratio between total light intensity when measurement
To set energy accounting, it is used to correct fiber exit total light intensity fluctuation bring measurement error with reference to light intensity.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727371A (en) * | 2017-09-28 | 2018-02-23 | 哈尔滨工程大学 | Measure astronomical optical fiber transmissivity and the system and measuring method of focal ratio degradation simultaneously |
| CN108225745A (en) * | 2018-02-09 | 2018-06-29 | 长飞光纤光缆股份有限公司 | A kind of Double Cladding Ytterbium Doped Fiber laser slope efficiency test system and test method |
| CN109141824A (en) * | 2018-08-20 | 2019-01-04 | 中国科学院云南天文台 | It is a kind of for integrating the integrated detection device and detection method of visual field fiber spectrometer optical fiber property |
| CN109959502A (en) * | 2019-04-10 | 2019-07-02 | 深圳市计量质量检测研究院（国家高新技术计量站、国家数字电子产品质量监督检验中心） | A kind of measuring device and measurement method of hot spot key parameter |
| CN110261065A (en) * | 2019-06-26 | 2019-09-20 | 哈尔滨工程大学 | A kind of astronomy optical fiber transmission property automatic measurement system |
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