CN104535302A - Device and method for measuring focusing constant g of self-focusing optical fiber - Google Patents
Device and method for measuring focusing constant g of self-focusing optical fiber Download PDFInfo
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- CN104535302A CN104535302A CN201410823903.XA CN201410823903A CN104535302A CN 104535302 A CN104535302 A CN 104535302A CN 201410823903 A CN201410823903 A CN 201410823903A CN 104535302 A CN104535302 A CN 104535302A
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Abstract
The invention discloses a device and method for measuring the focusing constant g of a self-focusing optical fiber. The measuring device comprises an optical fiber preprocessing device and an optical fiber refractive index measuring device. Cover glass is arranged in the center of a hole in the bottom of a sample cavity through gel, the sample cavity is cleaned, and the matching solution is injected in the sample cavity till the sample cavity is full of the matching solution. A bare optical fiber is arranged in an optical fiber clamp, and the bare optical fiber is clamped in a clamping frame after being cut and polished. The optical fiber is pushed till the end face of the optical fiber makes contact with the cover glass. An automatic alignment and one-dimensional linear scanning mode is set in a computer, and a refractive index distribution skeleton map is rapidly obtained. According to the refractive index distribution skeleton map detected by the measuring device, the refractive index data in a fiber core are extracted, and the measurement on the focusing constant g and the center refractive index n0 of the self-focusing optical fiber is achieved through the curve fitting algorithm.
Description
Technical field
The present invention relates to optical fiber property analysis field, the measurement mechanism of especially a kind of self-focusing optical fiber Focusing constant g and method.
Background technology
Self-focusing optical fiber (Sel-focusing fiber) is also known as gradient index fibre (Gradient-index fiber), be a kind of optical fiber of index distribution radially gradual change, diameter can be consistent with interferometer outgoing tail optical fiber (being generally single-mode fiber).The self-focusing optical fiber camera lens utilizing self-focusing optical fiber to make has the self-focusing function the same with GRIN Lens, have again the advantage of optical fiber: pass that optical property is good, volume is little, be easy to and Single-Mode Fiber Coupling etc., therefore self-focusing optical fiber camera lens has broad application prospects in the imaging inspection of the narrow and small tissue such as cardiovascular in recent years simultaneously.(1.E. Swanson, C.L. Petersen, et al.. Ultrasmall optical probes, imaging optics, and methods for using same [P]. U.S. Patent, 2002,6445939; 2. Y.X. Mao, S.D. Chang, et al.. Graded-index fiber lens proposed for ultrasmall probes used in biomedical imaging [J]. Appl. Opt., 2007,46 (23): 5887 ~ 5894; 3.C.Wang, Shubo Bi, Xueqin Xia, Yingjie Yua. Further analysis of focusing performance of an ultra-small gradient-index fiber probe [J] .Optical Engineering, 2014,53 (1) .) index distribution of self-focusing optical fiber affects the key factor that self-focusing optical fiber camera lens passes optical property, its distribution coefficient generally adopts Focusing constant
grepresent.By changing Focusing constant
gvalue, the performance of camera lens can be controlled to a certain extent.Therefore, self-focusing optical fiber Focusing constant
gmeasurement, be an important research content in self-focusing optical fiber lens design and manufacturing process.At present for the optical performance test of self-focusing optical fiber, majority concentrates on and utilizes the method such as refraction process, interferometric method to obtain index distribution profile, lacks Focusing constant
gfurther testing and analysis.The present invention carries out launching for this gordian technique just.
Summary of the invention
The object of the invention is to solve and there is no special self-focusing optical fiber Focusing constant at present
gmeasurement mechanism and the problem of method, measurement mechanism and the method for a kind of self-focusing optical fiber Focusing constant g are provided, based near field refractive method refractive Index Distribution Measurement, adopt the measuring method of curve fitting algorithm, realize self-focusing optical fiber Focusing constant
gand refractive index of the centre
n 0 quick detection.
For achieving the above object, the present invention adopts following technical proposals:
A kind of self-focusing optical fiber Focusing constant
gmeasurement mechanism, comprise self-focusing optical fiber apparatus for measuring refractive index and self-focusing optical fiber end face pretreatment unit; Described self-focusing optical fiber apparatus for measuring refractive index comprises light source, condenser lens combination, the adjustment of Z axis stepper motor, cover glass, X-Y axle precision platform, sample cavity, holding frame, ellipsoidal mirror, detector, computing machine, base and fiber clamp; Described fiber clamp is clipped on described holding frame at measurement self-focusing optical fiber refractive index fashionable dress, described holding frame and described sample cavity are fixed on described X-Y axle precision adjustment platform, described X-Y axle precision adjustment platform is fixed on base, described Z axis stepper motor combines with described condenser lens and is connected, and described detector is connected by data line with described computing machine; The travel path of optical path is: adjust described Z axis stepper motor, the laser beam sent by described light source is successively after described condenser lens combination and described cover glass, be focused at the end face of self-focusing optical fiber sample to be measured, by the laser beam that reflects from self-focusing optical fiber sample after described ellipsoidal mirror reflection, received by described detector; Described self-focusing optical fiber end face pretreatment unit comprises clamping knob, three-dimensional adjustment platform, fiber cutter, reference platform, fixed placement is on three-dimensional adjustment platform when pre-service self-focusing optical fiber end face for described fiber clamp, and described three-dimensional adjustment platform and described fiber cutter are fixed on described reference platform; Described fiber cutter comprises optical fiber stationary fixture, magnetic folder lock, optical fiber cutter and mobile motor.
A kind of self-focusing optical fiber Focusing constant
gmeasuring method, concrete implementation step is:
1) pre-service is carried out to self-focusing optical fiber sample end face;
2) self-focusing optical fiber sample refractive index is measured, obtain the index distribution contour curve at the distance axial line diverse location place of self-focusing optical fiber sample;
3) according to the index distribution contour curve of the self-focusing optical fiber sample to be measured detected, the refractive index in fibre core is drawn
n(
r) with radial distance
rchange measurement data (
r i ,
n i ), wherein
r i represent radial distance,
n i represent radial distance
r i the refractive index at place;
4) self-focusing optical fiber Focusing constant
gwith
r i ,
n i relation according to the theoretical formula of self-focusing optical fiber index distribution:
（1）
In formula,
n 0represent self-focusing optical fiber central axis place refractive index, adopt quadratic polynomial fitting algorithm, to measurement data (
r i ,
n i ) process, and calculate the Focusing constant of self-focusing optical fiber
g;
5) adopt quadratic polynomial fitting algorithm, according to measurement data (
r i ,
n i ) draw self-focusing optical fiber refractive index
n(
r) with
rquadratic polynomial be:
（2）
Wherein,
trepresentative polynomial matching exponent number,
a 2,
a 1,
a 0represent coefficient of polynomial fitting.
6) by self-focusing optical fiber refractive index
n(
r) with
rquadratic polynomial be transformed to
（3）
7) by the index contrast of formula (3) and formula (1), self-focusing optical fiber Focusing constant is obtained
gwith central axis place refractive index
n 0be respectively:
,
.
Above-mentioned steps 5)-7) replace with following two steps:
1) adopt linear fit algorithm, use variable
xreplace
r 2 , self-focusing optical fiber refractive index
n(
r) with
rlinear function close be
（4）
Wherein, conversion coefficient
,
;
2) by the index contrast of formula (4) and formula (1), self-focusing optical fiber Focusing constant is obtained
gwith central axis place refractive index
n 0be respectively:
,
.
The concrete implementation step of described step 1) is:
A) described fiber clamp fixed placement is adjusted on platform in three-dimensional, adjust described three-dimensional adjustment platform, make the center line of the described optical fiber stationary fixture of described fiber clamp and described fiber cutter on the same axis;
B) self-focusing optical fiber sample to be measured is peelled off the coat of certain length, with alcohol wipe self-focusing optical fiber sample, lightly self-focusing optical fiber sample is pushed in fiber clamp, make self-focusing optical fiber sample one end exceed the end face of the optical fiber stationary fixture of described fiber cutter, adopt described clamping knob and the fixing self-focusing optical fiber sample two ends of described magnetic folder lock;
C) utilize the mobile motor in described fiber cutter to drive described optical fiber cutter to cut to the position to be cut of self-focusing optical fiber sample, after polishing, obtain self-focusing optical fiber end face to be measured.
Described step 2) concrete implementation step be:
A) cover glass is cleaned by alcohol wipe, by cover glass gel in sample cavity bottom opening center;
B) by cleaning, wiping, drying process, the inside and outside surface of sample cavity is cleaned, inject matching fluid, make matching fluid be full of sample cavity, and bubble-free produces;
C) the fiber clamp clamping of the pretreated self-focusing optical fiber sample through end will be housed on holding frame, slowly promote ground self-focusing optical fiber sample and its end face is contacted with the cover glass bottom sample cavity;
D) arrange automatic precision alignment so in computing machine, the position of the Z axis stepper motor of adjustment X-Y axle precision adjustment platform and focus direction, by the focal beam spot center of light beam of light source and the end face center superposition of self-focusing optical fiber sample;
E) profit is computerizedd control, and X-Y axle is accurate adjusts platform, utilize one-dimensional linear scan mode, the intensity signal of self-focusing optical fiber sample is detected by described detector, and be transferred in described computing machine and process, obtain the index distribution contour curve at the distance axial line diverse location place of self-focusing optical fiber sample.
The present invention compared with prior art, has following apparent outstanding substantive distinguishing features and remarkable advantage:
X-Y axle precision adjustment platform and Z axis stepper motor adjustment beam focusing position is adopted in measurement mechanism of the present invention, optimize focusing and the centrality of light beam, realize automatic precision to aim at and linear sweep, improve detection efficiency and precision, the index distribution profile diagram that measuring method of the present invention obtains according to measurement mechanism, propose to adopt curve fitting algorithm, realize Focusing constant
gand refractive index of the centre
n 0 measurement, adopt the comparative analysis of multiple curve mode, improve accuracy of detection further, processing ease, convenient.
Accompanying drawing explanation
Fig. 1 is self-focusing optical fiber Focusing constant
gmeasurement mechanism in measure the formation schematic diagram of self-focusing optical fiber refractive index.
Fig. 2 is self-focusing optical fiber Focusing constant
gmeasurement mechanism in the formation schematic diagram of pre-service optical fiber, wherein (a) is vertical view, and (b) is front view.
Fig. 3 is self-focusing optical fiber Focusing constant
gmeasurement mechanism display refractive index profile distribution curve schematic diagram.
Fig. 4 is self-focusing optical fiber Focusing constant
gmeasuring method general flow chart.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
See Fig. 1 and Fig. 2, a kind of self-focusing optical fiber Focusing constant
gmeasurement mechanism, comprise self-focusing optical fiber apparatus for measuring refractive index and self-focusing optical fiber end face pretreatment unit; Described self-focusing optical fiber apparatus for measuring refractive index comprises light source 101, condenser lens combination 102, Z axis stepper motor 103, cover glass 104, the adjustment of X-Y axle precision platform 105, sample cavity 106, holding frame 107, ellipsoidal mirror 108, detector 109, computing machine 110, base 111 and fiber clamp 112; Described fiber clamp 112 is clipped on described holding frame 107 at measurement self-focusing optical fiber refractive index fashionable dress, described holding frame 107 and described sample cavity 106 are fixed on described X-Y axle precision adjustment platform 105, described X-Y axle precision adjustment platform 105 is fixed on base 111, described Z axis stepper motor 103 and described condenser lens combine 102 and are connected, and described detector 109 is connected by data line with described computing machine 110; The travel path of optical path is: adjust described Z axis stepper motor 103, the laser beam sent by described light source 101 is successively after described condenser lens combination 102 and described cover glass 104, be focused at the end face of self-focusing optical fiber sample 113 to be measured, by the laser beam reflected from self-focusing optical fiber sample 113 after described ellipsoidal mirror 108 reflects, received by described detector 109; Described self-focusing optical fiber end face pretreatment unit comprises clamping knob 201, three-dimensional adjustment platform 202, fiber cutter 207, reference platform 208, fixed placement is on three-dimensional adjustment platform 202 when pre-service self-focusing optical fiber end face for described fiber clamp 112, and described three-dimensional adjustment platform 202 and described fiber cutter 207 are fixed on described reference platform 208; Described fiber cutter 207 comprises optical fiber stationary fixture 203, magnetic folder lock 204, optical fiber cutter 205 and mobile motor 206.
In this example, refraction index test instrument employing Photon Kinetics company model is the fiber end face refraction index test instrument of S14 Refractive Index Profiler.The remarkable company in self-focusing optical fiber employing Taiwan model is the optical fiber of 50/125/250 μm of Multimode Optical Fiber, the Focusing constant of producer's nominal
gvalue is 5.5mm
-1, refractive index of the centre
n 0 be 1.486.
As shown in Figure 4, a kind of self-focusing optical fiber Focusing constant
gmeasuring method, concrete implementation step is:
1) pre-service is carried out to self-focusing optical fiber sample 113 end face;
2) self-focusing optical fiber sample 113 refractive index is measured, obtain the index distribution contour curve at the distance axial line diverse location place of self-focusing optical fiber sample 113;
3) as shown in Figure 3, according to the index distribution contour curve of the self-focusing optical fiber sample 113 to be measured detected, the refractive index in fibre core is drawn
n(
r) with radial distance
rchange measurement data (
r i ,
n i ), wherein
r i represent radial distance,
n i represent radial distance
r i the refractive index at place; Concrete data are as following table 1:
Index distribution experimental data in table 1 case
4) self-focusing optical fiber Focusing constant
gwith
r i ,
n i relation according to the theoretical formula of self-focusing optical fiber index distribution:
（1）
In formula,
n 0represent self-focusing optical fiber central axis place refractive index, adopt quadratic polynomial fitting algorithm, to measurement data (
r i ,
n i ) process, and calculate the Focusing constant of self-focusing optical fiber
g;
5) adopt quadratic polynomial fitting algorithm, according to measurement data (
r i ,
n i ) draw self-focusing optical fiber refractive index
n(
r) with
rquadratic polynomial be:
（2）
6) by self-focusing optical fiber refractive index
n(
r) with
rquadratic polynomial be transformed to
（3）
7) by the index contrast of formula (3) and formula (1), self-focusing optical fiber Focusing constant is obtained
gwith central axis place refractive index
n 0be respectively:
,
.
Described step 5)-7) replace with following two steps:
1) adopt linear fit algorithm, use variable
xreplace
r 2 , self-focusing optical fiber refractive index
n(
r) with
rlinear function close be
= -22.7512
X+1.4969 （4）
2) by the index contrast of formula (4) and formula (1), self-focusing optical fiber Focusing constant is obtained
gwith central axis place refractive index
n 0be respectively:
,
.
The concrete implementation step of described step 1) is:
A) described fiber clamp 112 fixed placement is adjusted on platform 202 in three-dimensional, adjust described three-dimensional adjustment platform 202, make the center line of the described optical fiber stationary fixture 203 of described fiber clamp 112 and described fiber cutter 207 on the same axis;
B) self-focusing optical fiber sample 113 to be measured is peelled off the coat of certain length, with alcohol wipe self-focusing optical fiber sample 113, lightly self-focusing optical fiber sample 113 is pushed in fiber clamp 112, make self-focusing optical fiber sample 113 one end exceed the end face of the optical fiber stationary fixture 203 of described fiber cutter 207, adopt described clamping knob 201 and described magnetic folder lock 204 to fix self-focusing optical fiber sample 113 two ends;
C) utilize the mobile motor 206 in described fiber cutter 207 to drive the position to be cut of described optical fiber cutter 205 to self-focusing optical fiber sample 113 to cut, after polishing, obtain self-focusing optical fiber end face to be measured.
Described step 2) concrete implementation step be:
A) cover glass 104 is cleaned by alcohol wipe, by cover glass 104 gel in sample cavity 106 bottom opening center;
B) by cleaning, wiping, drying process, the inside and outside surface of sample cavity 106 is cleaned, inject matching fluid, make matching fluid be full of sample cavity 106, and bubble-free produces;
C) fiber clamp 112 clamping of the pretreated self-focusing optical fiber sample 113 through end will be housed on holding frame 107, slowly promote ground self-focusing optical fiber sample 113 and its end face is contacted with the cover glass 104 bottom sample cavity 106;
D) arrange automatic precision alignment so in computing machine 110, the position of the Z axis stepper motor 104 of adjustment X-Y axle precision adjustment platform 105 and focus direction, by the focal beam spot center of light beam of light source and the end face center superposition of self-focusing optical fiber sample 113;
E) computing machine 110 control X-Y axle precision adjustment platform 105 is utilized, utilize one-dimensional linear scan mode, the intensity signal of self-focusing optical fiber sample 113 is detected by described detector 109, and be transferred in described computing machine 110 and process, obtain the index distribution contour curve at the distance axial line diverse location place of self-focusing optical fiber sample 113.
Claims (5)
1. a self-focusing optical fiber Focusing constant
gmeasurement mechanism, comprise self-focusing optical fiber apparatus for measuring refractive index and self-focusing optical fiber end face pretreatment unit; It is characterized in that, described self-focusing optical fiber apparatus for measuring refractive index comprises light source (101), condenser lens combination (102), Z axis stepper motor (103), cover glass (104), X-Y axle precision adjustment platform (105), sample cavity (106), holding frame (107), ellipsoidal mirror (108), detector (109), computing machine (110), base (111) and fiber clamp (112); Described fiber clamp (112) is clipped on described holding frame (107) at measurement self-focusing optical fiber refractive index fashionable dress, described holding frame (107) and described sample cavity (106) are fixed on described X-Y axle precision adjustment platform (105), described X-Y axle precision adjustment platform (105) is fixed on base (111), described Z axis stepper motor (103) is combined (102) and is connected with described condenser lens, described detector (109) is connected by data line with described computing machine (110); The travel path of optical path is: adjust described Z axis stepper motor (103), the laser beam sent by described light source (101) is successively after described condenser lens combination (102) and described cover glass (104), be focused at the end face of self-focusing optical fiber sample (113) to be measured, the laser beam that will reflect from self-focusing optical fiber sample (113), after described ellipsoidal mirror (108) reflection, is received by described detector (109); Described self-focusing optical fiber end face pretreatment unit comprises clamping knob (201), three-dimensional adjustment platform (202), fiber cutter (207), reference platform (208), described fiber clamp (112) fixed placement when pre-service self-focusing optical fiber end face adjusts on platform (202) in three-dimensional, and described three-dimensional adjustment platform (202) and described fiber cutter (207) are fixed on described reference platform (208); Described fiber cutter (207) comprises optical fiber stationary fixture (203), magnetic folder lock (204), optical fiber cutter (205) and mobile motor (206).
2. a self-focusing optical fiber Focusing constant
gmeasuring method, it is characterized in that, concrete implementation step is:
1) pre-service is carried out to self-focusing optical fiber sample (113) end face;
2) self-focusing optical fiber sample (113) refractive index is measured, obtain the index distribution contour curve at the distance axial line diverse location place of self-focusing optical fiber sample (113);
3) according to the index distribution contour curve of the self-focusing optical fiber sample (113) to be measured detected, the refractive index in fibre core is drawn
n(
r) with radial distance
rchange measurement data (
r i ,
n i ), wherein
r i represent radial distance,
n i represent radial distance
r i the refractive index at place;
4) self-focusing optical fiber Focusing constant
gwith
r i ,
n i relation according to the theoretical formula of self-focusing optical fiber index distribution:
（1）
In formula,
n 0represent self-focusing optical fiber central axis place refractive index, adopt quadratic polynomial fitting algorithm, to measurement data (
r i ,
n i ) process, and calculate the Focusing constant of self-focusing optical fiber
g;
5) adopt quadratic polynomial fitting algorithm, according to measurement data (
r i ,
n i ) draw self-focusing optical fiber refractive index
n(
r) with
rquadratic polynomial be:
（2）
Wherein,
trepresentative polynomial matching exponent number,
a 2,
a 1,
a 0represent coefficient of polynomial fitting;
6) by self-focusing optical fiber refractive index
n(
r) with
rquadratic polynomial be transformed to
（3）
7) by the index contrast of formula (3) and formula (1), self-focusing optical fiber Focusing constant is obtained
gwith central axis place refractive index
n 0be respectively:
,
.
3. a kind of self-focusing optical fiber Focusing constant according to claim 2
gmeasuring method, it is characterized in that, described step 5)-7) replace with following two steps:
1) adopt linear fit algorithm, use variable
xreplace
r 2 , self-focusing optical fiber refractive index
n(
r) with
rlinear function close be
（4）
Wherein, conversion coefficient
,
;
2) by the index contrast of formula (4) and formula (1), self-focusing optical fiber Focusing constant is obtained
gwith central axis place refractive index
n 0be respectively:
,
.
4. a kind of self-focusing optical fiber Focusing constant according to claim 2
gmeasuring method, it is characterized in that, the concrete implementation step of described step 1) is:
A) described fiber clamp (112) fixed placement is adjusted on platform (202) in three-dimensional, adjust described three-dimensional adjustment platform (202), make the center line of the described optical fiber stationary fixture (203) of described fiber clamp (112) and described fiber cutter (207) on the same axis;
B) self-focusing optical fiber sample (113) to be measured is peelled off the coat of certain length, with alcohol wipe self-focusing optical fiber sample (113), lightly self-focusing optical fiber sample (113) is pushed in fiber clamp (112), make self-focusing optical fiber sample (113) one end exceed the end face of the optical fiber stationary fixture (203) of described fiber cutter (207), adopt described clamping knob (201) and fixing self-focusing optical fiber sample (113) two ends of described magnetic folder lock (204);
C) utilize the mobile motor (206) in described fiber cutter (207) to drive described optical fiber cutter (205) to cut to the position to be cut of self-focusing optical fiber sample (113), after polishing, obtain self-focusing optical fiber end face to be measured.
5. a kind of self-focusing optical fiber Focusing constant according to claim 2
gmeasuring method, it is characterized in that, described step 2) concrete implementation step be:
A) cover glass (104) is cleaned by alcohol wipe, by cover glass (104) gel in sample cavity (106) bottom opening center;
B) by cleaning, wiping, drying process, sample cavity (106) inside and outside surface is cleaned, inject matching fluid, make matching fluid be full of sample cavity (106), and bubble-free produces;
C) fiber clamp (112) clamping of the pretreated self-focusing optical fiber sample (113) through end will be housed on holding frame (107), and slowly promote ground self-focusing optical fiber sample (113) and its end face is contacted with the cover glass (104) of sample cavity (106) bottom;
D) in computing machine (110), automatic precision alignment so is set, the position of the Z axis stepper motor (104) of adjustment X-Y axle precision adjustment platform (105) and focus direction, by the end face center superposition of the focal beam spot center of light beam of light source and self-focusing optical fiber sample (113);
E) computing machine (110) control X-Y axle precision adjustment platform (105) is utilized, utilize one-dimensional linear scan mode, the intensity signal of self-focusing optical fiber sample (113) is detected by described detector (109), and be transferred in described computing machine (110) and process, obtain the index distribution contour curve at the distance axial line diverse location place of self-focusing optical fiber sample (113).
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| CN104535302B (en) | 2017-03-15 |
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