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From 4D Technology Corporation
Interferometry is used for testing optical components and optical systems as well as the metrology of many other components, such as the flatness and roughness of hard disk drive platters and the shape of magnetic recording heads and machined parts. This article describes three recent advances that are broadening the applications of interferometric metrology: a new technique for reducing the sensitivity of interferometry to vibration; an interferometric method for measuring deformations and vibrations of diffuse surfaces; and a method for reducing the sensitivity to vibration and coherent noise and enabling measurement of parallel glass surfaces. Before delving into these new techniques, I will first describe phase-shifting interferometry, which is critical to all three advances. Moreover, the phase shifting technique has greatly increased the popularity and the usefulness of interferometry in industrial and research applications. Products & Services
Surface metrology equipment is used to measure the surface finish and/or geometry of engineering components. Surface texture and topology characteristics include surface roughness, contour, form, waviness and defects.
Form gages and form gaging systems are used to inspect parameters such as roundness, angularity, squareness, straightness, flatness, runout, taper and concentricity.
Non-destructive testing (NDT) services use test methods to examine an object, material or system without impairing its future usefulness.
Optical flats or test plates are polished surfaces that are used as references against the flatness of unknown surfaces for comparison. They use the property of interference to measure the flatness of a test surface.
Thickness gages are used to make precise dimensional measurements on a wide variety of coatings and materials including steel, plastic, glass, rubber, ceramics, paint, electroplated layers, enamels, etc
Product Announcements
Topics of Interest
In the testing of optical components and optical systems there are many requirements on the precision and accuracy, measurement time, ease of use, dynamic range, and environmental conditions.
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There are three types of optical strain gauges: photoelastic, Moire interferometry, and holographic interferometry.
Photoelastic strain gauges subject an elastomeric material to a load and illuminate...
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Faster product development and reduced time-to-market have made optical surface profilers essential tools for three-dimensional metrology of MEMS. The Veeco Instruments Wyko® NT Series Optical...
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The technique for measuring changes in diffuse surfaces using Electronic Speckle Pattern Interferometry (ESPI) is well known. We present a new electronic speckle pattern interferometer that takes...
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Determination of the spatial variations of optical phase is of primary importance in the fields of optical testing and metrology, optical recording of wavefronts, optical information processing, and...
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Technical Articles
Improved Interferometric Optical Testing (.pdf)
- Test and Measurement
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