IT1137002B - Optical energy sensor and demodulation system - Google Patents
Optical energy sensor and demodulation systemInfo
- Publication number
- IT1137002B IT1137002B IT21356/81A IT2135681A IT1137002B IT 1137002 B IT1137002 B IT 1137002B IT 21356/81 A IT21356/81 A IT 21356/81A IT 2135681 A IT2135681 A IT 2135681A IT 1137002 B IT1137002 B IT 1137002B
- Authority
- IT
- Italy
- Prior art keywords
- single mode
- etched
- mode fibre
- fibre
- glass clad
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title abstract 2
- 239000000835 fiber Substances 0.000 abstract 7
- 239000011521 glass Substances 0.000 abstract 3
- 238000005253 cladding Methods 0.000 abstract 1
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 239000011162 core material Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The signal energy to be sensed or detected is caused to stretch an etched single mode fibre. An etched single mode fibre is a single mode glass clad fibre whose cladding thickness has been reduced a specific amount so as to lower its strength. The invention provides that, when necessary to maintain the etched single mode fibre's light guiding properties, the portion of the glass clad which was removed is replaced with a plastic material whose optical index is lower than that of the single mode fibre's core material and whose elastic modulus is lower than that of the glass clad which it replaces. Such an etched single mode fibre is more sensitive to stretching or compression because it is weaker. For a given amount of signal energy, a single mode fibre will stretch a greater amount after it has been etched. The sensor is used in a hydrophone array.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT21356/81A IT1137002B (en) | 1981-04-24 | 1981-04-24 | Optical energy sensor and demodulation system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT21356/81A IT1137002B (en) | 1981-04-24 | 1981-04-24 | Optical energy sensor and demodulation system |
Publications (2)
Publication Number | Publication Date |
---|---|
IT8121356A0 IT8121356A0 (en) | 1981-04-24 |
IT1137002B true IT1137002B (en) | 1986-09-03 |
Family
ID=11180593
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT21356/81A IT1137002B (en) | 1981-04-24 | 1981-04-24 | Optical energy sensor and demodulation system |
Country Status (1)
Country | Link |
---|---|
IT (1) | IT1137002B (en) |
-
1981
- 1981-04-24 IT IT21356/81A patent/IT1137002B/en active
Also Published As
Publication number | Publication date |
---|---|
IT8121356A0 (en) | 1981-04-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19970430 |