Fiber optic strain sensing with phase-shifting interferometric techniques

Li-Horng Shyu; Yeh-Fen Fu; Jen-yu Shieh

doi:10.1117/12.252149

24 September 1996 Fiber optic strain sensing with phase-shifting interferometric techniques

Li-Horng Shyu, Yeh-Fen Fu, Jen-yu Shieh

Proceedings Volume 2895, Fiber Optic Sensors V; (1996) https://doi.org/10.1117/12.252149
Event: Photonics China '96, 1996, Beijing, China

Abstract

We present the performance of a sensor with an optical fiber strain gauge. The system adopts a phase-shifting technique with an equal phase shifting modulation to determine the strain on the sensor. It is accomplished by applying a triangle-wave-modulated signal to the injection current of a visible laser diode with precision temperature control, and its demodulation technique employs a digital signal processing (DSP) to calculate the phase of strain and a statistic processing to improve the signal-to-noise ratio. The experiments show that the relation between the optical phase difference and the external strain is linear.

Citation Download Citation

Li-Horng Shyu, Yeh-Fen Fu, and Jen-yu Shieh "Fiber optic strain sensing with phase-shifting interferometric techniques", Proc. SPIE 2895, Fiber Optic Sensors V, (24 September 1996); https://doi.org/10.1117/12.252149

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