Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
American Express Investment Management Co
Original Assignee
American Express Investment Management Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Express Investment Management CofiledCriticalAmerican Express Investment Management Co
Priority to FR7206599ApriorityCriticalpatent/FR2173479A5/fr
Application grantedgrantedCritical
Publication of FR2173479A5publicationCriticalpatent/FR2173479A5/fr
G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
G01B11/00—Measuring arrangements characterised by the use of optical techniques
G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
G01B11/161—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means
G01B11/164—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means by holographic interferometry
G—PHYSICS
G01—MEASURING; TESTING
G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
G01B9/00—Measuring instruments characterised by the use of optical techniques
G01B9/02—Interferometers
G01B9/021—Interferometers using holographic techniques