Contrast enhanced and phase controlled stroboscopic additive fibre optic TV-holography for whole field out-of-plane vibration analysis

摘要: Abstract A new technique for real-time contrast enhancement and phase control of fringes in additive Stroboscopic TV-holography applied to out-of-plane vibration analysis its implementation on a fibre-optic electronic speckle pattern interferometer (FOESPI) are presented. Synchronous illumination, firing two pulses per object period, is combined with simultaneous inter-pulse (high frequency) inter-frame (low modulation the reference arm ESPI yielding sequence frames (interferograms) that grabbed processed real-time. With this both fringe phases independently controlled by means parameters enabling inversion, as required enhance visibility sequential subtraction, well dynamic shifting solve peakvalley ambiguities.