Referenced intensity-modulated optical fiber sensor system for measuring linear displacement

John M. Senior; G. Murtaza; Anthony I. Stirling; Geoffrey H. Wainwright

doi:10.1117/12.141265

5 March 1993 Referenced intensity-modulated optical fiber sensor system for measuring linear displacement

John M. Senior, G. Murtaza, Anthony I. Stirling, Geoffrey H. Wainwright

Proceedings Volume 1795, Fiber Optic and Laser Sensors X; (1993) https://doi.org/10.1117/12.141265
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

The development of a dual wavelength referenced intensity-modulated optical fiber sensor system is described. The system utilizes a single broadband LED source whose emission is spectrally sliced to provide two separate narrow-band wavelength signals, one as the measurand and a second as the reference. The allocated wavelength bands were selected to minimize differential intensity effects between the two optical signals that may arise from the LED thermal variations. Subsequently, the sensor system provides an output fully referenced for all major common-mode variations arising from the optical propagation effects as well as those due to the LED instability. The complete system comprises of a terminal transceiver unit which incorporates the system electronics together with a specially designed LED coupler and wavelength demultiplexer device which is interfaced to an optical sensor using a single optical fiber. A Graded-Index (GRIN) rod microlens together with an interference filter and a moving mirror element are used in the optical sensor to provide a mechanism for intensity modulation of the measurand signal. The performance characteristics of an advanced prototype sensor system are reported which demonstrate substantial amount of linear displacement. Finally, an initial investigation of the immunity of the system to common-mode variations is also described.

Citation Download Citation

John M. Senior, G. Murtaza, Anthony I. Stirling, and Geoffrey H. Wainwright "Referenced intensity-modulated optical fiber sensor system for measuring linear displacement", Proc. SPIE 1795, Fiber Optic and Laser Sensors X, (5 March 1993); https://doi.org/10.1117/12.141265

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