Abstract
A novel demodulation technique for performing dynamic de- formation measurements using a path-unbalanced Michelson interferom- eter is reported. The method is based on the rf amplitude modulation of a low-coherence source, and demodulation is achieved by tracking in the frequency domain the position of the minimum of the detected intensity. This technique is particularly suitable for deformation measurements in civil engineering structures where deformations of the order of few milli- meters over the sensor length are expected. The method features a measurement range of at least 10 mm, sensitivity better than 10 mm, and dynamic deformation measurements with a bandwidth up to 100 Hz. © 2003 Society of Photo-Optical Instrumentation Engineers. (DOI: 10.1117/1.1543563) Subject terms: optical fiber sensors; Michelson interferometer; deformation mea- surements; dynamic measurements; amplitude modulation; tracking system.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
