On-line submicron profile measurements from safe distances with conoscopic holography: feasibility and potential problems

Ignacio Alvarez; Jose MarÃ­a Enguita; Jorge Marina; Cesar Fraga Bobis

doi:10.1117/1.2844713

1 February 2008 On-line submicron profile measurements from safe distances with conoscopic holography: feasibility and potential problems

Ignacio Alvarez, Jose MarÃa Enguita, Jorge Marina, Cesar Fraga Bobis

Author Affiliations +

Optical Engineering, Vol. 47, Issue 2, 023602 (February 2008). https://doi.org/10.1117/1.2844713

Abstract

On-line noncontact surface inspection with high precision is still an open problem. Usual methods are, in general, not applicable in hostile environments or not adequate for on-line measurement, as they are either slow in nature or need to work from very short, unsafe distances, providing small depths of field and apertures. The ongoing work toward the development of a noncontact optical profile measuring sensor that could be used for submicron measurements in on-line applications is presented here. Our approach is based on conoscopic holography and triangulation, and uses a very simple method for removing speckle noise, which is key for obtaining high precisions from safe distances (several centimeters).

©(2008) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Ignacio Alvarez, Jose MarÃa Enguita, Jorge Marina, and Cesar Fraga Bobis "On-line submicron profile measurements from safe distances with conoscopic holography: feasibility and potential problems," Optical Engineering 47(2), 023602 (1 February 2008). https://doi.org/10.1117/1.2844713

Published: 1 February 2008

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