JPS5742835A - Device and method for measuring refractive index distribution of preform - Google Patents

Device and method for measuring refractive index distribution of preform

Info

Publication number
JPS5742835A
JPS5742835A JP11770280A JP11770280A JPS5742835A JP S5742835 A JPS5742835 A JP S5742835A JP 11770280 A JP11770280 A JP 11770280A JP 11770280 A JP11770280 A JP 11770280A JP S5742835 A JPS5742835 A JP S5742835A
Authority
JP
Japan
Prior art keywords
preform
lens
knife
edge
filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP11770280A
Other languages
Japanese (ja)
Other versions
JPH0262814B2 (en
Inventor
Katsunari Okamoto
Nobuo Inagaki
Takayoshi Ogoshi
Masayuki Nishimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP11770280A priority Critical patent/JPS5742835A/en
Publication of JPS5742835A publication Critical patent/JPS5742835A/en
Publication of JPH0262814B2 publication Critical patent/JPH0262814B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • G01M11/37—Testing of optical devices, constituted by fibre optics or optical waveguides in which light is projected perpendicularly to the axis of the fibre or waveguide for monitoring a section thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • G01N21/412—Index profiling of optical fibres

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

PURPOSE:To measure distribution very precisely without destruction by arranging a lens behind a preform, a knife-edge between the preform and lens, and a space filter, having a laterally long slit, in the rear focal plane of the lens. CONSTITUTION:A preform 11 is held vertically (in direction z) in a refrective index adjusting liquid having the same refractive index as that of a clad. This preform 11 is irradiated with parallel laser light 12 laterally; and a lens 13 is arranged a distance L' away from the preform 11, a knife-edge 14 is arranged between the preform 11 and lens 13 and a distance L away from the preform, and a space filter 15 having a laterally long slit is arranged in the rear focal plane of the lens 13. Further, a TV camera 16 is arranged behind the filter 15. Consequently, the light forms an image through the lens 13 from the center surface of the preform 11 by way of the knife-edge 14 to observe a pattern regarding the knife-edge 14 which is obtained through the filter 15.
JP11770280A 1980-08-28 1980-08-28 Device and method for measuring refractive index distribution of preform Granted JPS5742835A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11770280A JPS5742835A (en) 1980-08-28 1980-08-28 Device and method for measuring refractive index distribution of preform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11770280A JPS5742835A (en) 1980-08-28 1980-08-28 Device and method for measuring refractive index distribution of preform

Publications (2)

Publication Number Publication Date
JPS5742835A true JPS5742835A (en) 1982-03-10
JPH0262814B2 JPH0262814B2 (en) 1990-12-26

Family

ID=14718189

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11770280A Granted JPS5742835A (en) 1980-08-28 1980-08-28 Device and method for measuring refractive index distribution of preform

Country Status (1)

Country Link
JP (1) JPS5742835A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6029149U (en) * 1983-08-03 1985-02-27 日本セメント株式会社 Cement raw material calcination equipment
US6919954B2 (en) * 2000-10-20 2005-07-19 Issei Sasaki Method and apparatus for measuring internal index of refraction of preform of optical fiber

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6029149U (en) * 1983-08-03 1985-02-27 日本セメント株式会社 Cement raw material calcination equipment
US6919954B2 (en) * 2000-10-20 2005-07-19 Issei Sasaki Method and apparatus for measuring internal index of refraction of preform of optical fiber

Also Published As

Publication number Publication date
JPH0262814B2 (en) 1990-12-26

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