Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1974-03-27
1976-06-22
Corbin, John K.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
250572, 356237, 356239, G01B 902
Patent
active
039648303
ABSTRACT:
A method for inspecting flaws existing on the surface or existing in the inside of material through employment of a coherent and spherical wave of light is disclosed, in which method a flat wave of light, such as He-Ne Laser light, is converted by a lens system into a coherent and spherical wave of the light, and subsequently the spherical wave of the light is brought into impingement upon the material to be inspected and, further, a Fresnel diffraction pattern of the material is produced on an inspection screen through a projection method whereby two-dimensional images, which approximate the shape of the flaws of the material, are observed.
REFERENCES:
patent: 3518007 (1970-06-01), Ito
patent: 3748047 (1973-07-01), Millgard et al.
patent: 3764216 (1973-10-01), Bliek et al.
born et al. Principles of Optics, Second Ed. Macmillan, pp. 445-449, 1964.
Ikeda Hiroyuki
Inagaki Takefumi
Corbin John K.
Fujitsu Ltd.
Koren Matthew W.
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