Phase-shifting laser scanning confocal microscopy moiré method and its applications

Abstract

The laser scanning confocal microscopy (LSCM) moiré method is an effective method for full-field displacement and strain measurement in the micrometer scale. In this study, the phase-shifting LSCM moiré method is proposed for automatic processing of the moiré fringe. A combined phase-shifting and loading system for LSCM was developed, which could offer a tensile load on the plate type sample with a maximum load range of up to 500 N. Using the PZT (piezoelectric ceramic) phase shifter in the loading system, the moiré fringe phase was shifted and measured. Full field deformation was calculated according to the phase data. With the combination of LSCM and the self-developed loading system, tensile deformation of the aluminum sample was measured by the phase-shifting LSCM moiré technique. Full-field deformations under the different loads and elastic modulus of the sample were obtained. Experimental results demonstrated the feasibility of this technique, and the accuracy for deformation measurement is clearly improved.