Optical path automatic compensation low-coherence interferometric fibre-optic temperature sensor

✍ Scribed by Libo Yuan

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 407 KB
• Volume: 30
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(98)00009-7

✦ Synopsis

An interferometric ®bre-optic temperature sensing system employing a light emitting diode (LED) as the broadband optical source and a single mode ®bre coil which was fabricated in a de®nite length as the sensor head is described. A reference ®bre line transmitting back and forth along the same path as the sensing transmitting ®bre is used, so the change caused by the environmental temperature ¯uctuation of the ®bre path can automatically be compensated. The sensitivity of the sensing system can be easily improved by using the long length of the sensing ®bre. The experiment results of the sensing gauge length versus the sensitivity are given. Two typical wavelengths (1300 and 1550 nm). LED sources are used, it is shown that the sensitivity of the system between the two wavelengths is dierent. The experimental curve of the resolution characteristic of the system related to the length of sensing ®bre coil is also discussed.