Optical instrument evaluation using modulation transfer function

Details Optical instrument evaluation using modulation transfer function Optical instrument evaluation using modulation transfer function

1993-11-24

1995-03-28

Rosenberger, Richard A.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

283115, G01M 1100

Patent

active

054022258

ABSTRACT:
A novel chart permits rapid and inexpensive evaluation of an optical instrument for manufacturing purposes and/or by an operator of the instrument. For example, a user of an optical instrument may directly test the performance of an instrument without the assistance of trained personnel or a well-equipped laboratory facility. The chart comprises a plurality of levels defined by blocks having converging lines extending therein. The plurality of levels define a corresponding plurality of contrast levels between their blocks and the converging lines therein. The chart is used by viewing a plurality of levels within the chart and determining corresponding line frequency values at which the viewer is unable to discern multiple lines. These line frequency values are then compared to calibration line frequency values for the instrument being evaluated. The chart of the present invention is easily transported and used, and may be supplied along with an optical instrument to define operating characteristics of the instrument.

REFERENCES:
patent: 4324459 (1982-04-01), Gerharz
patent: 4575124 (1986-03-01), Morrison
patent: 4653909 (1987-03-01), Kuperman
patent: 5303023 (1994-04-01), Portney et al.
Armin J. Hill, "A Resolution Test Chart for Motion Picture Cameras", American Cinematographer, Oct. 1951, vol. 32, Iss. #10, p. 402.
"Resoluton Test Chart of the Motion Picture Research Council" British Kinematography, Oct. 1952, vol. 21, Iss. 4, pp. 102-103.
Whelan et al, "Videoarthroscopy: Review and State of the Art; Arthroscopy" The Journal of Arthroscopic and Related Surgery, 8(3):311-319, 1992.

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