Effect of Errors to a Laser-Speckle1 Strain Gauge

摘要

This paper proposes a new arrangement for an interferometric laser-speckle gauge. For the proposed set-up geometrical inaccuracies are assumed. Therefore, we are looking for a sensor position, where the geometrical inaccuracies are having the smallest impact on the measurement result. For the measurement of an applied measurand vector to the observed specimen, we suggest a linear unbiased minimum variance estimator. Theory an measurement results using this estimator are shown for a specific measurement set-up of the laser-speckle strain gauge.