JPS5756777A - Method for measuring time difference of light propagation - Google Patents
Method for measuring time difference of light propagationInfo
- Publication number
- JPS5756777A JPS5756777A JP13081780A JP13081780A JPS5756777A JP S5756777 A JPS5756777 A JP S5756777A JP 13081780 A JP13081780 A JP 13081780A JP 13081780 A JP13081780 A JP 13081780A JP S5756777 A JPS5756777 A JP S5756777A
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical path
- beams
- light source
- time difference
- 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
Links
Classifications
-
- 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
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measurement Of Unknown Time Intervals (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
PURPOSE:To make the accurate measurement of refractive indices possible by using coherent light, measuring the fluctuation of the light power inputting to a photo- detector, determining a peak value of visibility, and measuring the time difference of light propagation from the difference in optical path lengths. CONSTITUTION:The light out from a light source 21 is bisected by a beam splitter 22, one of which is turned back by a fixed mirror 23, and the other is turned back by a mirror 24 placed in a variable optical delay path 25. If these two beams of light are so adjusted as to superpose on each other in a photodetector 26, the optical path lengths of the two beams of light cause level fluctuation owing to the interference of the two beams within coherence length. In this case, if a light source of short coherence length is used as the light source, the light passing the optical path 2a and the light passing the optical path 2b are matched on the photodetecting surface 26 with high accuracy in time, and refractive indices are measured accurately.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13081780A JPS5756777A (en) | 1980-09-22 | 1980-09-22 | Method for measuring time difference of light propagation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13081780A JPS5756777A (en) | 1980-09-22 | 1980-09-22 | Method for measuring time difference of light propagation |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5756777A true JPS5756777A (en) | 1982-04-05 |
JPH0338555B2 JPH0338555B2 (en) | 1991-06-11 |
Family
ID=15043400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13081780A Granted JPS5756777A (en) | 1980-09-22 | 1980-09-22 | Method for measuring time difference of light propagation |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5756777A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011128040A (en) * | 2009-12-18 | 2011-06-30 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber refractive index measuring device and optical fiber refractive index measuring method |
CN103776801A (en) * | 2012-10-17 | 2014-05-07 | 成都光明光电股份有限公司 | Detection method of optical element refractivity and detection device thereof |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4203831B2 (en) * | 2006-11-30 | 2009-01-07 | 独立行政法人産業技術総合研究所 | Precision measurement method for group refractive index of optical materials |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4827717A (en) * | 1971-06-18 | 1973-04-12 | ||
JPS5010509A (en) * | 1973-05-24 | 1975-02-03 | ||
JPS5225117A (en) * | 1975-08-18 | 1977-02-24 | Kanebo Ltd | Prepapation of flame retardant polyamide |
JPS5231750A (en) * | 1975-04-07 | 1977-03-10 | Toray Ind Inc | Print device |
JPS553407U (en) * | 1978-06-20 | 1980-01-10 |
-
1980
- 1980-09-22 JP JP13081780A patent/JPS5756777A/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4827717A (en) * | 1971-06-18 | 1973-04-12 | ||
JPS5010509A (en) * | 1973-05-24 | 1975-02-03 | ||
JPS5231750A (en) * | 1975-04-07 | 1977-03-10 | Toray Ind Inc | Print device |
JPS5225117A (en) * | 1975-08-18 | 1977-02-24 | Kanebo Ltd | Prepapation of flame retardant polyamide |
JPS553407U (en) * | 1978-06-20 | 1980-01-10 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011128040A (en) * | 2009-12-18 | 2011-06-30 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber refractive index measuring device and optical fiber refractive index measuring method |
CN103776801A (en) * | 2012-10-17 | 2014-05-07 | 成都光明光电股份有限公司 | Detection method of optical element refractivity and detection device thereof |
Also Published As
Publication number | Publication date |
---|---|
JPH0338555B2 (en) | 1991-06-11 |
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