We demonstrate a fiber optic dynamic displacement sensing system based on an unbalanced Michelson interferometer. In this system, the phase of the reference light is modulated with triangle and stepwise waveforms. The high-frequency triangle phase modulation makes the interferometer produce a series of chevron-shaped signals. From the change in temporal width of each signal, displacement of an object is measured with high time resolution. The effect of environmentally induced instability enhanced by a relatively large path length difference is suppressed by changing the phase by the step-wise modulation. A 10-kHz vibration displacement, which had not been measured without the step-wise phase modulation, was successfully measured by using a fiber optic Michelson interferometer even with a path length difference of 1 m.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
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.