Optical fiber vibration sensor using (Pancharatnam) phase step interferometry

Abstract

A fiber-optic vibration sensor based on polarizationand phase-step interferometry is reported. Left-and rightcircularly polarized light coming back from the reference and signal arms of a modified Michelson fiber interferometer is processed with an array of five linear analyzers separated angular steps of =4 (rad) from each other. Thus, five interference patterns are acquired simultaneously and the dynamical phase retrieval problem is reduced to five-step interferometry in the time-domain. A vibration sensor as described above was built by the authors and its performance was investigated.

High-Precision Calibration of Phase-Only Spatial Light Modulators

“…The extraction of the modulation phase from the interference pattern recorded by the camera is based on the well-known phase-shifting interferometry. Our phase-evaluation method utilizes the polarization state of light to realize the so-called Pancharatnam phase-shifting [23]. When a linearly polarized light illuminates the SLM, the x-polarized component of the reflected light acquires a phase-only modulation, while the y-polarized component reflecting off the SLM does not undergo modulation, and hereby acts as the reference wave.…”

Pixel-addressable phase calibration of spatial light modulators: a common-path phase-shifting interferometric microscopy approach

“…The principle of the phase measurement is based on the well-known phase shifting interferometry [22][23][24][25]. Our phase-evaluation method utilizes the polarization state of light to realize the so-called Pancharatnam phase shifting [26]. When a linearly polarized light illuminates the SLM, the xpolarized component of the reflected light acquires phaseonly modulation, while the y-polarized component is reflected by the SLM without phase modulation, and is taken as the reference wave here.…”

Phase-sensitive optical time domain reflectometry based on geometric phase measurement

“…Geometric Phase is generally studied in the space domain where the SOP of light can be rotated topologically using wave plates or a twisted optical fiber in the context of opto-electronic systems 28 – 31 . In fact, the use of geometric phase in optical fiber sensors 32 or vibration sensing 33 is not new. However, a novel context for the existence of geometric phase is in the time domain 34 – 36 which has recently been studied in the beating of lightwaves.…”