A novel technique, moire deflectometry, for ray deflection mapping is presented. Numerous experimental techniques for diagnostics of phase objects and specular surfaces, for shearing analysis, for microscopy, and for MTF determination, based on moire deflectometry, are described. The wide range of applications encompasses laser beam diagnostics, characterization of optical components, flow visualization in wind tunnels, temperature mapping of flames, turbulence study, and real -time tracking of transient phenomena like thermal lensing. Subject terms: 3 -D sensing for inspection; moire deflectometry; metrology; optical testing; laser beam diagnostics; flow visualization.Optical Engineering 24 (6), 944 -960 (November /December 1985).

Mapping of temperature of a premixed hydrogen-oxygen flame by moire deflectometry is demonstrated. The technique is based on deflection mapping of rays from a collimated light beam due to gradients of the refractive index across the flame. For an axially symmetric flame the radial distribution of the refractive index was derived by Abel transformation. The temperature profile of the flame was calculated for a known gas composition assuming ideal gas behavior.

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A new moire deflectometer setup with a built-in telescope is proposed. This setup is equally suitable for measuring both phase objects and specular surfaces requiring only minor adjustments. The telescope-based design enables high-sensitivity testing of large optical components with a 2.54-cm (1-in.) aperture optical system.

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