New Carré Equation

Metrology and Measurement Systems

Pedro Magalhaes¹  Perrin Neto¹  Cristina Magalhães¹ 

关键词: metrology;    Moiré techniques;    fringe analysis;    phase measurement;    phase shifting technique;    Carré equation;   

DOI  :  10.2478/v10178-010-0016-6

来源: Versita

【 摘 要 】

The present work offers new equations for phase evaluation in measurements. Several phase-shifting equations with an arbitrary but constant phase-shift between captured intensity signs are proposed. The equations are similarly derived as the so called Carré equation. The idea is to develop a generalization of the Carré equation that is not restricted to four images. Errors and random noise in the images cannot be eliminated, but the uncertainty due to their effects can be reduced by increasing the number of observations. An experimental analysis of the errors of the technique was made, as well as a detailed analysis of errors of the measurement. The advantages of the proposed equation are its precision in the measures taken, speed of processing and the immunity to noise in signs and images.

【 授权许可】

Unknown