Electro-optic readout of thermoplastic deformation patterns

Details Electro-optic readout of thermoplastic deformation patterns Electro-optic readout of thermoplastic deformation patterns

1975-01-06

1976-04-06

Cardillo, Jr., Raymond F.

Telegraphy

Systems

Simplex-reversing periodic

96 11, 178 72, 340173TP, 350162R, H04N 582, H04N 530, G03G 1600

Patent

active

039491609

ABSTRACT:
A method of and apparatus for reading out information disposed as a surface deformation such as a thermoplastic deformation pattern is disclosed in accordance with the teachings of the present invention. A coherent light beam is projected to the surface deformation pattern and one of the first order components of the diffraction pattern received from the deformation pattern is imaged onto a surface. At the surface, the first order component is mixed with a further coherent light beam to form an interference pattern comprised of image modulated sinusoidal interference fringes. The interference pattern has an intensity that varies as a linear function of the amplitude of the deformation pattern. In a preferred embodiment thereof, the first order component of the diffraction pattern is imaged to the surface by an imaging lens optically positioned out of optical communication with the zero order component of the diffraction pattern. The further coherent light beam is provided by optical filter disposed to receive the zero order component of the diffraction pattern and to transmit the zero order component to the surface. The optical filter includes a lens having a focal point disposed in the focal plane of the imaging lens and offset from the focal point of the imaging lens. The surface at which the interference pattern is formed comprises a photoelectric transducer for generating an electric signal representing the interference pattern, the signal being comprised of an informational component related to the deformation pattern modulated onto a carrier component related to the spatial frequency of the interference fringes. The informational component is recovered by demodulation of the electric signal.

REFERENCES:
patent: 3131257 (1964-04-01), Wallace
patent: 3436216 (1969-04-01), Urbach
patent: 3838401 (1974-09-01), Graf et al.

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