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This study discusses a non-contact optical technique(electronic speckle pattern interferometry) that is well suited for thermal deformation measurement without any surface preparation and compensating process. Fiber reinforced plastics ([0] 16, [0/90J8S) were analyzed by ESPI to determine their thermal expansion coefficients. The thermal expansion coefficient of the transverse direction of a uniaxial composite is evaluated as 48.78 X 10-6 (1/'C ). Also, the thermal expansion coefficient of the cross-ply laminate [0/90J85 is numerically estimated as 3.23 X 10-6 (l/'C) that is compared with that measured by ESPI.

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