Fiber-Optic Microprobe For Interferometric Measurements In Generators

L De Maria; M Martinelli; C Pistoni; A Barberis

doi:10.1117/12.965073

8 June 1988 Fiber-Optic Microprobe For Interferometric Measurements In Generators

L De Maria, M Martinelli, C Pistoni, A Barberis

Proceedings Volume 0867, Optical Devices in Adverse Environments; (1988) https://doi.org/10.1117/12.965073
Event: 1987 Symposium on the Technologies for Optoelectronics, 1987, Cannes, France

Abstract

In the framework of the development of an extrinsic type fiber-optic interferometric sensor, the design and the qualification tests of the sensing microprobe are presented. The microprobe is the end-termination of a fiber-optic instrument devised for the monitoring of the end-turn vibrations of large generators. Since the monitoring must be made in real operating conditions, the microprobe must survive in real harsh environment: 100°C average temperature, very high electromagnetic field (30000 Amp. average current), pure hydrogen at 4 atmosphere pressure, high mechanical noise. The microprobes were developed following two approaches: conventional and stacked micro-optics concept. Several thermal tests showed a better behaviour by the stacked-optic microprobe. During the test, autointerference modulation phenomena appeared on the control beams. A hypothesis of a polyetalon existence inside the microprobe was formulated and its correctness was supported by a computer simulation. Preliminary qualification tests of the whole interferometric instrument, ended by the stacked-optic microprobe, showed an excellent response over the whole thermal operating range.

Citation Download Citation

L De Maria, M Martinelli, C Pistoni, and A Barberis "Fiber-Optic Microprobe For Interferometric Measurements In Generators", Proc. SPIE 0867, Optical Devices in Adverse Environments, (8 June 1988); https://doi.org/10.1117/12.965073

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available