CN102878955B - Measuring equipment and measuring method for eccentricity ratios of large-diameter preform - Google Patents
Measuring equipment and measuring method for eccentricity ratios of large-diameter preform Download PDFInfo
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Abstract
The invention discloses measuring equipment and a measuring method for eccentricity ratios of a large-diameter preform, belongs to the field of manufacture of optical fiber preforms, and relates to equipment and methods for measuring eccentricity ratios of preforms by mirror reflection measurement. The measuring equipment comprises a measuring table, a sliding table, a measuring table back plate, a detected data display screen, a data output display screen, a laser transmitting and receiving instrument support, an adjusting knob, a laser transmitting and receiving instrument, a rear linear guide rail, a left fixed roller bracket, a left support roller, a front linear guide rail, a graduated scale, a rotating motor, a moving bracket, a preform supporting rotating roller, a right fixed roller bracket, a right support roller, a left-right moving motor and a left-right moving lead screw. The measuring method includes steps of placing the preform on the left support roller and the right support roller on the left fixed roller bracket and the right fixed roller bracket, testing the surface of a body of the preform by the laser transmitting and receiving instrument in real time, recording data, collecting data of eccentricity ratios of various circumferential points around a first measuring point, computing an eccentricity ratio of the first measuring point by an eccentricity ratio computational formula; and measuring eccentricity ratio of a second measuring point.
Description
Technical field
The measuring equipment of a kind of major diameter prefabricated rods of the present invention excentricity and measuring method thereof belong to preform and manufacture field, relate to the Apparatus for () and method therefor utilizing mirror reflection measuring prefabricated rods excentricity.
Background technology
The preform that general prefabricated rods enterprise produces at present is the vitreum of two-layer different refractivity, the relative surrounding layer excentricity of sandwich layer vitreum directly has influence on product quality, need accurately to measure excentricity in prefabricated rods production run, judge that whether product is qualified, this is the key index of prefabricated rods.
Early stage, surveying instrument detected prefabricated rods excentricity mainly by refraction index test method, by the master bar that refractive index is certain, demarcated, calculated the refractive index of intermediate medium oil.Again the distribution signal of refractive index on a certain cross section of prefabricated rods is collected, calculate, calculate prefabricated rods excentricity, and then be convenient to the quality analyzing prefabricated rods.But the method has the defect of self, along with preform diameter size is constantly done slightly, weight also strengthens thereupon, to existing measuring equipment chuck clamping carrying, the size capacity of oil storage tank, and the aspect of laser instrument all can not meet the demands, existing measuring equipment on the market is also failed to realize major diameter (diameter >=10mm) prefabricated rods excentricity and is measured.
The defect that early stage, surveying instrument possessed comprises: 1) for the supporting different frock of rod needs of different size, very poor to the change adaptability of product, cannot meet the measurement simultaneously possessing multi-specification; 2) early stage surveying instrument take refractive index principle, need light by whole rod, very high to the requirement of laser instrument, cannot meet excellent footpath thicker after measuring accuracy requirement.
Summary of the invention
The object of the invention is for above-mentioned weak point, a kind of measuring equipment and measuring method thereof of major diameter prefabricated rods excentricity are provided, that one utilizes mirror-reflection principle, accurately measure the Apparatus for () and method therefor of compound glass body excentricity, measuring accuracy reaches 0.01mm, meets the precision measure requirement of large scale (diameter >=100m) prefabricated rods excentricity completely.
A kind of measuring equipment and measuring method thereof of major diameter prefabricated rods excentricity take following technical scheme to realize: a kind of measuring equipment of major diameter prefabricated rods excentricity comprises test desk, Mobile Slide, test desk backboard, detect data display screen, data output display screen, Laser emission receiving instrument support, adjusting knob, Laser emission receiving instrument, rear linear guides, left fixed idler whell bracket, left support roller, frontal guide rail, rule, electric rotating machine, movable support bracket, hold in the palm excellent swing roller, right fixed idler whell bracket, right support roller, move left and right motor and move left and right leading screw, in test desk upper rear end, test desk backboard is installed, test desk backboard is provided with and detects data display screen and data output display screen, Mobile Slide is arranged on the frontal guide rail of test desk, the test desk of Mobile Slide left end is provided with left fixed idler whell bracket, left fixed idler whell bracket is provided with left support roller, the test desk of Mobile Slide right-hand member is provided with right fixed idler whell bracket, right fixed idler whell bracket is provided with right support roller, Mobile Slide is provided with movable support bracket, movable support bracket is provided with electric rotating machine and the excellent swing roller of holder, electric rotating machine is connected with the excellent swing roller of holder by the shaft coupling that output shaft is installed, and drives the excellent swing roller of holder to rotate by electric rotating machine, linear guides after Mobile Slide rear portion is provided with, rear linear guides is provided with Laser emission receiving instrument support, Laser emission receiving instrument is arranged on Laser emission receiving instrument support front end, adjusting knob is arranged on Laser emission receiving instrument, is used for regulating Laser emission light and prefabricated rods angle, test desk is provided with and moves left and right motor, move left and right motor output shaft by shaft coupling with move left and right screw mandrel and be connected, move left and right screw mandrel to be arranged in frontal guide rail and rear linear guides, make Laser emission receiving instrument and movable support bracket can movement jointly.In face of test desk, rule is equipped with in portion, is used for the position of auxiliary judgement measurement point.
Described laser pick-off instrument support is lifting type support, can regulate height as required.
Principle of work: prefabricated rods is fixed on measurement table top by left fixed idler whell bracket, support roller, right fixed idler whell bracket and right support roller by the measuring equipment of a kind of major diameter of the present invention prefabricated rods excentricity, drive prefabricated rods to rotate by movable support bracket and the excellent swing roller of holder, Laser emission receiving instrument and movable support bracket are followed together with Mobile Slide and are moved.By adjusting the height of adjusting knob and Laser emission receiving instrument support, controlling Laser emission receiving instrument and impinging upon barred body surface angle and distance.Collected by the light of Laser emission receiving instrument by transmitting, amplify through amplifier and transmit, through data collecting card, analyzing and processing is carried out to data, calculate the distance L1 of sandwich layer and surrounding layer and the distance L2 of L1 symmetry direction sandwich layer and surrounding layer, L1 or L2 is carried out converting to normal data, calculates excentricity by conversion rate computing formula.
A kind of measuring method of measuring equipment of major diameter prefabricated rods excentricity comprises the steps:
1) on left support roller prefabricated rods being placed on left fixed idler whell bracket and right fixed idler whell bracket and right support roller, ensure that prefabricated rods can rotate freely, movable support bracket moved to the first measurement point position and fix, holder rod swing roller on movable support bracket is promoted to and contacts completely with prefabricated rods surface, rotarily drive prefabricated rods by electric rotating machine and rotate; Adjustment Laser emission receiving instrument support height, makes Laser emission receiving instrument and prefabricated rods surface distance be 50 ~ 100mm; Adjustment adjusting knob, thus the laser of adjustment Laser emission receiving instrument transmitting and barred body surface angle, obtain largest light intensity, and by detecting data display screen, observation is the most two hunchbacked waveform; Connect electric rotating machine, drive the excellent swing roller of holder to rotate and prefabricated rods rotation, accept instrument by Laser emission and in real time barred body surface is tested, and record data, collect this circumference each point excentricity data, and measured circumferencial direction each point dual hump tables of data is exported by amplifier; Utilize discrete method to screen above-mentioned data by Intouch shell script, reasonable valid data are calculated the excentricity of this position by program compiler (i.e. Intouch shell script) by excentricity computing formula.
Described reasonable valid data refer to analyzes data by discrete method, loose point data is deleted, and in other data, get maximal value is this excentricity.
2) second point measurement is carried out
Control to reduce the excellent swing roller of holder by PLC or single-chip microcomputer control program, guarantee to ask excellent swing roller not contact with prefabricated rods surface, control electric rotating machine starts, drive shaft coupling rotates, by moving left and right leading screw movable support bracket being moved to the second point measuring position of setting, utilizing table top rule to carry out distance and confirming.Holder rod swing roller on movable support bracket is promoted to and contacts completely with prefabricated rods surface; Connect electric rotating machine, the excellent swing roller of holder and prefabricated rods is driven to rotate, in real time barred body surface is tested by Laser emission receiving instrument, and record data, barred body is utilized to rotate, collect this measuring position circumferentially each point excentricity data, and measured circumferencial direction each point dual hump tables of data is exported by amplifier; Utilize discrete method to screen this data preparation by intouch program, by reasonable valid data by described intouch program computation, calculated the excentricity of this position by excentricity computing formula.
Excentricity is the numerical value of single-point, and so-called second point is measured as first other measurement of putting in addition, and a rod can be surveyed multiple point, multiple point has different excentricities.
For the prefabricated rods of different radii, when measuring installation, its measuring method is identical with described step, only needs adjustment Laser emission receiving instrument support height, makes Laser emission receiving instrument distance prefabricated rods surface 50 ~ 100mm.Adjustment adjusting knob, by detecting data display screen, can know and see the strongest two hunchbacked waveform.
For the prefabricated rods of different length, when measuring installation, adjust the position of left fixed idler whell bracket and right fixed idler whell bracket, then fix, thus realize the measurement of different length prefabricated rods, its measuring method is identical with described step.
The present invention utilizes laser specular reflection principle, can measure two-layer or multilayer prefabricated rods.Measuring principle utilizes Laser emission to go out LASER Light Source, and inclination certain angle shines transparent prefabricated rods on the surface, ensures angle of inclination and measuring distance by regulating device on support.Utilize laser different refractivity surface in prefabricated rods to reflect, adopt the signal of laser pickoff to specular light to collect, judge multiple position such as glass core outward flange and surrounding layer outward flange according to the strong and weak situation of change of mirror signal.The measuring distance of two positions is calculated by light signal, consider that light exists refraction and occurs position deviation problem in different medium, need measurement data to convert, utilize convert formula to calculate glass core outward flange and the outer peripheral actual accurate location of surrounding layer.At the uniform velocity rotate prefabricated rods, measure in each point data on prefabricated rods surface, row filter of going forward side by side, then by formula, sandwich layer is calculated relative to outer field center deviation distance values.
It has four benefits: one is can measure the rod of different-diameter, changes adaptability very strong to the specification of product; Two is that the prefabricated rods measuring different size does not need independent measurement frock, and direct regulation meter just can realize with the spacing of rod; Three is that device structure is simple, and input cost is very low.Four is utilize mirror-reflection principle, and light is not by whole prefabricated rods, requires lower to Laser emission and receiver.
Accompanying drawing explanation
Below with reference to accompanying drawing, the present invention is further described:
Fig. 1 is the structural representation of the measuring equipment of a kind of major diameter prefabricated rods of the present invention excentricity.
Fig. 2 is the measuring principle figure of the measuring equipment of a kind of major diameter prefabricated rods of the present invention excentricity.
Fig. 3 is the measurement data waveform schematic diagram of the measuring equipment of a kind of major diameter prefabricated rods of the present invention excentricity.
In figure: 1, detect data display screen, 2, Laser emission receiving instrument support, 3, adjusting knob, 4, Laser emission receiving instrument, 5, rear linear guides, 6, prefabricated rods, 7, left fixed idler whell bracket, 8, left support roller, 9, frontal guide rail, 10, rule, 11, electric rotating machine, 12, movable support bracket, 13, hold in the palm excellent swing roller, 14, right support roller, 15, right fixed idler whell bracket, 16, shaft coupling, 17, move left and right motor, 18, move left and right leading screw, 19, data output display screen, 20, test desk, 21, Mobile Slide, 22, test desk backboard, 23, sandwich layer, 24, surrounding layer.
φ 1 is prefabricated rods sandwich layer 23 diameter, and φ 2 is prefabricated rods surrounding layer 24 diameters, and L1 is the distance of sandwich layer 23 and surrounding layer 24, and L2 is the distance of L1 symmetry direction sandwich layer 23 and surrounding layer 24.
Embodiment
With reference to accompanying drawing 1 ~ 3, a kind of measuring equipment of major diameter prefabricated rods excentricity comprises test desk 20, Mobile Slide 21, test desk backboard 22, detects data display screen 1, data output display screen 19, Laser emission receiving instrument support 2, adjusting knob 3, Laser emission receiving instrument 4, rear linear guides 5, left fixed idler whell bracket 7, left support roller 8, frontal guide rail 9, rule 10, electric rotating machine 11, movable support bracket 12, holds in the palm excellent swing roller 13, right fixed idler whell bracket 15, right support roller 14, moves left and right motor 17 and move left and right leading screw; In test desk 20 upper rear end, test desk backboard 22 is installed, test desk backboard 22 is provided with and detects data display screen 1 and data output display screen 19; Mobile Slide 21 is arranged on the frontal guide rail 9 of test desk 20, the test desk of Mobile Slide 21 left end is provided with left fixed idler whell bracket 7, left fixed idler whell bracket 7 is provided with left support roller 8, the test desk of Mobile Slide 21 right-hand member is provided with right fixed idler whell bracket 15, right fixed idler whell bracket 15 is provided with right support roller 14; Mobile Slide 21 is provided with movable support bracket 12, movable support bracket 12 is provided with electric rotating machine 11 and the excellent swing roller 13 of holder, electric rotating machine 11 is connected with the excellent swing roller 13 of holder by the shaft coupling that output shaft is installed, and drives the excellent swing roller 13 of holder to rotate by electric rotating machine 11; Linear guides 5 after Mobile Slide 21 rear portion is provided with, rear linear guides 5 is provided with Laser emission receiving instrument support 2, Laser emission receiving instrument 4 is arranged on Laser emission receiving instrument support 2 front end, adjusting knob 3 is arranged on Laser emission receiving instrument 4, is used for regulating Laser emission light and prefabricated rods angle; Test desk 20 is provided with and moves left and right motor 17, move left and right motor 17 output shaft by shaft coupling 16 with move left and right screw mandrel 18 and be connected, move left and right screw mandrel 18 to be arranged in frontal guide rail 9 and rear linear guides 5, make Laser emission receiving instrument 4 and movable support bracket 12 can movement jointly.In face of test desk, rule 10 is equipped with in portion, is used for the position of auxiliary judgement measurement point.
Described laser pick-off instrument support 2 is lifting type support, can regulate height as required.
Principle of work: prefabricated rods 6 is fixed on measurement table top by left fixed idler whell bracket 7, support roller 8, right fixed idler whell bracket 15 and right support roller 14 by the measuring equipment of a kind of major diameter of the present invention prefabricated rods excentricity, drive prefabricated rods 6 to rotate by movable support bracket 12 and the excellent swing roller 13 of holder, Laser emission receiving instrument 4 and movable support bracket 12 are followed together with Mobile Slide 21 and are moved.By adjusting the height of adjusting knob 3 and Laser emission receiving instrument support 2, controlling Laser emission receiving instrument 4 and impinging upon barred body surface angle and distance.Collected by the light of Laser emission receiving instrument 4 by transmitting, amplify through amplifier and transmit, through data collecting card, analyzing and processing is carried out to data, calculate the distance L1 of sandwich layer 23 with the surrounding layer 24 and distance L2 of L1 symmetry direction sandwich layer 23 and surrounding layer 24, L1 or L2 is carried out converting to normal data, calculates excentricity by conversion rate computing formula.
A kind of measuring method of measuring equipment of major diameter prefabricated rods excentricity comprises the steps:
1) on the left support roller 8 prefabricated rods 6 being placed on left fixed idler whell bracket 7 and right fixed idler whell bracket 15 and right support roller 14, ensure that prefabricated rods 6 can rotate freely, movable support bracket 12 moved to the first measurement point position and fix, by on movable support bracket 12 holder rod swing roller 13 be promoted to and contact completely with prefabricated rods 6 surface, rotarily drive prefabricated rods 6 by electric rotating machine 11 and rotate; Adjustment Laser emission receiving instrument support 2 height, makes Laser emission receiving instrument 4 and prefabricated rods 6 surface distance be 50 ~ 100mm; Adjustment adjusting knob 3, thus the laser of adjustment Laser emission receiving instrument 4 transmitting and barred body surface angle, obtain largest light intensity, and by detecting data display screen 1, observation is the most two hunchbacked waveform; Connect electric rotating machine 11, excellent swing roller 13 rotation of holder and prefabricated rods 6 is driven to rotate, accept instrument 4 by Laser emission to test barred body surface in real time, and record data, collect this circumference each point excentricity data, and measured circumferencial direction each point dual hump tables of data is exported by amplifier; Utilize discrete method to screen above-mentioned data by Intouch shell script, reasonable valid data are calculated the excentricity of this position by program compiler (i.e. Intouch shell script) by excentricity computing formula.
Described reasonable valid data refer to analyzes data by discrete method, loose point data is deleted, and in other data, get maximal value is this excentricity.
2) second point measurement is carried out
Control to reduce the excellent swing roller 13 of holder by PLC or single-chip microcomputer control program, guarantee to ask excellent swing roller 13 not contact with prefabricated rods 6 surface, control electric rotating machine 11 to start, drive shaft coupling rotates, by moving left and right leading screw 18 movable support bracket 12 being moved to the second point measuring position of setting, utilizing table top rule 10 to carry out distance and confirming.Holder rod swing roller 13 on movable support bracket 12 is promoted to and contacts completely with prefabricated rods 6 surface; Connect electric rotating machine 11, the excellent swing roller 13 of holder and prefabricated rods 6 is driven to rotate, in real time barred body surface is tested by Laser emission receiving instrument 4, and record data, barred body is utilized to rotate, collect this measuring position circumferentially each point excentricity data, and measured circumferencial direction each point dual hump tables of data is exported by amplifier; Utilize discrete method to screen this data preparation by intouch program, by reasonable valid data by described intouch program computation, calculated the excentricity of this position by excentricity computing formula.
For the prefabricated rods of different radii, when measuring installation, its measuring method is identical with described step, only needs adjustment Laser emission receiving instrument support 2 height, makes Laser emission receiving instrument 4 apart from prefabricated rods 6 surface 50 ~ 100mm.Adjustment adjusting knob 3, by detecting data display screen 1, can know and see the strongest two hunchbacked waveform.
For the prefabricated rods 6 of different length, when measuring installation, adjust the position of left fixed idler whell bracket 7 and right fixed idler whell bracket 14, then fix, thus realize the measurement of different length prefabricated rods, its measuring method is identical with described step.
Claims (5)
1. a measuring method for the measuring equipment of major diameter prefabricated rods excentricity, is characterized in that: testing apparatus comprises test desk, Mobile Slide, test desk backboard, detection data display screen, data output display screen, Laser emission receiving instrument support, adjusting knob, Laser emission receiving instrument, rear linear guides, left fixed idler whell bracket, left support roller, frontal guide rail, rule, electric rotating machine, movable support bracket, holder rod swing roller, right fixed idler whell bracket, right support roller, moves left and right motor and move left and right leading screw; In test desk upper rear end, test desk backboard is installed, test desk backboard is provided with and detects data display screen and data output display screen; Mobile Slide is arranged on the frontal guide rail of test desk, the test desk of Mobile Slide left end is provided with left fixed idler whell bracket, left fixed idler whell bracket is provided with left support roller, the test desk of Mobile Slide right-hand member is provided with right fixed idler whell bracket, right fixed idler whell bracket is provided with right support roller; Mobile Slide is provided with movable support bracket, movable support bracket is provided with electric rotating machine and the excellent swing roller of holder, electric rotating machine is connected with the excellent swing roller of holder by the shaft coupling that output shaft is installed, and drives the excellent swing roller of holder to rotate by electric rotating machine; Linear guides after Mobile Slide rear portion is provided with, rear linear guides is provided with Laser emission receiving instrument support, Laser emission receiving instrument is arranged on Laser emission receiving instrument support front end, adjusting knob is arranged on Laser emission receiving instrument, is used for regulating Laser emission light and prefabricated rods angle; Test desk is provided with and moves left and right motor, move left and right motor output shaft by shaft coupling with move left and right screw mandrel and be connected, move left and right screw mandrel to be arranged in frontal guide rail and rear linear guides, make Laser emission receiving instrument and movable support bracket can movement jointly; In face of test desk, rule is equipped with in portion, is used for the position of auxiliary judgement measurement point;
Measuring method comprises the steps:
1) on left support roller prefabricated rods being placed on left fixed idler whell bracket and right fixed idler whell bracket and right support roller, ensure that prefabricated rods can rotate freely, movable support bracket moved to the first measurement point position and fix, holder rod swing roller on movable support bracket is promoted to and contacts completely with prefabricated rods surface, rotarily drive prefabricated rods by electric rotating machine and rotate; Adjustment Laser emission receiving instrument support height, makes Laser emission receiving instrument and prefabricated rods surface distance be 50 ~ 100mm; Adjustment adjusting knob, thus the laser of adjustment Laser emission receiving instrument transmitting and barred body surface angle, obtain largest light intensity, and by detecting data display screen, observation is the most two hunchbacked waveform; Connect electric rotating machine, the excellent swing roller of holder is driven to rotate and prefabricated rods rotation, accept instrument by Laser emission to test barred body surface in real time, and record data, collect this test position circumferentially each point excentricity data, and measured circumferencial direction each point dual hump tables of data is exported by amplifier; Utilize discrete method to screen above-mentioned data by Intouch shell script, reasonable valid data are calculated the excentricity of this position by program compiler by excentricity computing formula;
2) second point measurement is carried out
Control to reduce the excellent swing roller of holder by PLC or single-chip microcomputer control program, guarantee to ask excellent swing roller not contact with prefabricated rods surface, control electric rotating machine starts, drive shaft coupling rotates, by moving left and right leading screw movable support bracket being moved to the second point measuring position of setting, utilizing table top rule to carry out distance and confirming; Holder rod swing roller on movable support bracket is promoted to and contacts completely with prefabricated rods surface; Connect electric rotating machine, the excellent swing roller of holder and prefabricated rods is driven to rotate, in real time barred body surface is tested by Laser emission receiving instrument, and record data, barred body is utilized to rotate, collect this measuring position circumferentially each point excentricity data, and measured circumferencial direction each point dual hump tables of data is exported by amplifier; Utilize discrete method to screen this data preparation by intouch program, by reasonable valid data by described intouch program computation, calculated the excentricity of this position by excentricity computing formula.
2. the measuring method of the measuring equipment of a kind of major diameter prefabricated rods excentricity according to claim 1, is characterized in that: described laser pick-off instrument support is lifting type support.
3. the measuring method of the measuring equipment of a kind of major diameter prefabricated rods excentricity according to claim 1, it is characterized in that: the reasonable valid data described in described step 1) refer to, data are analyzed by discrete method, loose point data deleted, in other data, get maximal value is this excentricity.
4. the measuring method of the measuring equipment of a kind of major diameter prefabricated rods excentricity according to claim 1, it is characterized in that: for the prefabricated rods of different radii, when measuring installation, its measuring method is identical with described step, adjustment Laser emission receiving instrument support height, makes Laser emission receiving instrument distance prefabricated rods surface 50 ~ 100mm, adjustment adjusting knob, by detecting data display screen, see the strongest two hunchbacked waveform.
5. the measuring method of the measuring equipment of a kind of major diameter prefabricated rods excentricity according to claim 1, it is characterized in that: for the prefabricated rods of different length, when measuring installation, adjust the position of left fixed idler whell bracket and right fixed idler whell bracket, then fix, thus realizing the measurement of different length prefabricated rods, its measuring method is identical with the step of described measuring method.
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| CN201210378949.6A CN102878955B (en) | 2012-10-09 | 2012-10-09 | Measuring equipment and measuring method for eccentricity ratios of large-diameter preform |
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| CN1358602A (en) * | 2000-12-14 | 2002-07-17 | 中国科学院力学研究所 | System for strengthening hot-roling roll by high-frequency pulse laser and strengthening method thereof |
| CN2534554Y (en) * | 2002-02-03 | 2003-02-05 | 殷镇良 | Reel workpieces diameter measurer |
| JP2003222506A (en) * | 2002-01-31 | 2003-08-08 | Kobe Steel Ltd | Thickness measuring device and thickness measuring method for transparent body, and thickness derivation device, thickness derivation method and thickness derivation program for transparent body |
| JP2006337089A (en) * | 2005-05-31 | 2006-12-14 | Shin Etsu Chem Co Ltd | Structure measuring method and measuring device of base material for optical fiber |
| CN1934432A (en) * | 2004-03-23 | 2007-03-21 | 信越化学工业株式会社 | Method for measuring noncircularity of core portion of optical fiber preform and its instrument |
| CN202853583U (en) * | 2012-10-09 | 2013-04-03 | 中天科技精密材料有限公司 | Measuring apparatus for eccentricity of major-diameter perform |
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2012
- 2012-10-09 CN CN201210378949.6A patent/CN102878955B/en not_active Expired - Fee Related
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| CN1358602A (en) * | 2000-12-14 | 2002-07-17 | 中国科学院力学研究所 | System for strengthening hot-roling roll by high-frequency pulse laser and strengthening method thereof |
| JP2003222506A (en) * | 2002-01-31 | 2003-08-08 | Kobe Steel Ltd | Thickness measuring device and thickness measuring method for transparent body, and thickness derivation device, thickness derivation method and thickness derivation program for transparent body |
| CN2534554Y (en) * | 2002-02-03 | 2003-02-05 | 殷镇良 | Reel workpieces diameter measurer |
| CN1934432A (en) * | 2004-03-23 | 2007-03-21 | 信越化学工业株式会社 | Method for measuring noncircularity of core portion of optical fiber preform and its instrument |
| JP2006337089A (en) * | 2005-05-31 | 2006-12-14 | Shin Etsu Chem Co Ltd | Structure measuring method and measuring device of base material for optical fiber |
| CN202853583U (en) * | 2012-10-09 | 2013-04-03 | 中天科技精密材料有限公司 | Measuring apparatus for eccentricity of major-diameter perform |
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| CN102878955A (en) | 2013-01-16 |
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