Method of measuring the amount of movement of an object having u

Details Method of measuring the amount of movement of an object having u Method of measuring the amount of movement of an object having u

1987-08-17

1989-04-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

048230014

ABSTRACT:
An object to be measured for the amount of movement thereof has a uniformly periodic structure. The object is illuminated with divergent light emitted from a coherent spot light source. By positionally adjusting the spot light source, the object, and a light sensor, an enlarged shadow-picture-like diffraction pattern of the uniformly periodic structure is generated at a position in which the light sensor is disposed. The shadow-picture-like diffraction pattern is moved when the object is moved across the divergent light from the spot light source. The amount of movement of the shadow-picture-like diffraction pattern is detected by the light sensor for thereby measuring the amount of movement of the object.

REFERENCES:
patent: 3879136 (1975-04-01), Takeda
patent: 4218615 (1980-08-01), Zinn, Jr.
patent: 4528448 (1985-07-01), Doggett
patent: 4629886 (1986-12-01), Akiyama et al.
patent: 4668862 (1987-05-01), Waibel
Halliday and Resnick, Fundamentals of Physics, John Wiley and Sons, 1974, p. 708.

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