Apparatus for measuring photoelasticity

Details Apparatus for measuring photoelasticity Apparatus for measuring photoelasticity

1987-01-06

1988-11-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356366, G02F 101

Patent

active

047868023

ABSTRACT:
An apparatus for measuring photoelasticity permitting to control mechanical stress applied to an elastic body, by visualizing phase differences of polarized light transmitted by the elastic body is disclosed. In such a prior art apparatus a quarter wavelength plate was used in order to obtain circularly polarized light. However, the precision of the circularly polarized light is worsened, when it works in a wide wavelength region. To the contrary, in an apparatus according to this invention, circularly polarized light is obtained by means of Fresnel's rhombic body. As the result good circularly polarized light can be obtained for a wide wavelength region from the visible region to the near infrared region and control of products including thin films and semiconductor substrates can be effected by visualizing mechanical stress therein.

REFERENCES:
patent: 2731875 (1956-01-01), Gould
patent: 3741660 (1973-06-01), Abu-Shumays et al.
patent: 4171908 (1979-10-01), Robert et al.
patent: 4309110 (1982-01-01), Tumerman

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