Abstract
This article describes and analyses an interferometric method for measuring displacements and deformation. The method can be used for a very accurate evaluation of the change in the surface shape of structures used in industry. The paper proposes several multistep phase calculation algorithms and describes an automatic evaluation process using the measurement technique. A complex analysis is also performed of various factors that can have a negative effect on the practical measurement and evaluation process. An analysis is made of the proposed multistep phase calculation algorithms using the proposed error model. It is shown that the resulting phase measurement errors can be effectively reduced by using suitable phase calculation algorithms. The analysis can be applied for a complex comparison of the accuracy and stability of such algorithms.
Highlights
The interferometric measurement technique known as electro-optic holography [1,2,3,4,5] is a modern noncontact measurement method based on the interference phenomenon [6,7] and phase shifting [1,7,8]
In contrast to classical holographic measurement techniques [17], modern optoelectronic array detectors are used for recording the intensity of the interference field, e.g. CCD, together with highly precise phase shifting devices that enable very accurate evaluation of the phase change of the object wave field
We have described a noncontact interferometric measurement technique that can be used for deformation measurement in industry
Summary
The interferometric measurement technique known as electro-optic holography [1,2,3,4,5] is a modern noncontact measurement method based on the interference phenomenon [6,7] and phase shifting [1,7,8]. In contrast to classical holographic measurement techniques [17], modern optoelectronic array detectors are used for recording the intensity of the interference field, e.g. CCD, together with highly precise phase shifting devices that enable very accurate evaluation of the phase change of the object wave field. This phase change of the object wave field is closely related to changes in the shape of the measured object surface that are caused, for example, by loading of the structure under investigation. The analysis can be used for a general comparison of any phase evaluation algorithm in phase shifting
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