We present a fiber-sensing technique that detects the mean-absolute speckle-intensity variation between the updated and the reference speckle pattern for determining the environmental perturbation factor (e.g., displacement, temperature, pressure, acoustic wave). We show that the proposed technique is highly sensitive and simple. One of the major advantages of the proposed technique is that it can perform a fast-response measurement with off-the-shelf electronic hardware. Experimental data for submicrometer displacement as well as temperature measurement are provided. To extend the dynamic range of the proposed technique, one can use an updated reference speckle pattern.
© 1994 Optical Society of America
Original Manuscript: April 14, 1993
Published: April 1, 1994
Kun Pan, Chii-Maw Uang, Feng Cheng, and Francis T. S. Yu, "Multimode fiber sensing by using mean-absolute speckle-intensity variation," Appl. Opt. 33, 2095-2098 (1994)