Method and apparatus for speckle-shearing interferometric deform

Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer

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356 355, 356347, 356354, G01B 902

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046828923

ABSTRACT:
A nondestructive means of testing tires for subsurface defects by speckle-shearing interferometry. The tire is illuminated with a beam of coherent light. The light reflected from a surface of the tire is directed through a converging lens having one-half of one of its surfaces covered by a transparent plate having flat parallel sides such that a photographic media is exposed to a first pair of focused images of the tire displaced with respect to one another. The tire is then subjected to a stress, and a second pair of slightly displaced images is recorded on the same photographic media. The photographic media is developed to form a transparency, and then a first surface of the developed photographic media is illuminated with a collimated white light source. Interference fringes that are observed by viewing the opposite surface of the photographic media may then be analyzed.

REFERENCES:
patent: 3767308 (1973-10-01), Duffy
patent: 4139302 (1979-02-01), Hung et al.
Chiange et al., "Whole Field Stress Analysis of a Centrally Cracked Tensile Plate by a Laser Speckle Method" Topical Meeting on Hologram Interferometry and Speckle Metrology, Jun. 2-4 1980, Cape Cod, Mass., pp. MA6-1-MA6-4.
Archbold et al., "Displacement Measurement from Double-Exposure Laser Photographs," Optica Acta. vol. 19, No. 4, pp. 253-271, 8/72.
Hung et al., "Measurement of Slopes of Structural Deflections by Specke-Shearing Interferometry" Eaptl. Mech., pp. 281-285, 7/74.
Hung et al, "Speckle-Shearing Interferometric Technique: A Full Field Strain Gauge", Applied Optics, vol. 14, No. 3, pp. 618-622, 3/75.
Duffy, "Measurement of Surface Displacement Normal to the Line of Sight", Eaptl. Mech. pp. 378-384, 9/74.

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