Electronic optical transfer function analyzer

Details Electronic optical transfer function analyzer Electronic optical transfer function analyzer

1973-04-24

1976-02-17

Smith, Alfred E.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356123, G01B 900, G01J 100

Patent

active

039388921

ABSTRACT:
An electronic optical analyzer for use in systems such as optical transfer function analyzers eliminates mechanical scanning systems and comprises entirely electronic image dissection means for dissecting an image transmitted by an optical system under test and producing an electric output signal representative of the beam intensity at a selected element of the image. The image dissection means is preferably (in the case of visible light) an image dissector tube whose positioning coils serve as an image element addressing means. The system is useable with any optical system including visible light, other electromagnetic radiation or charged particles (ions or electrons) so long as the image dissection means is responsive to the beam in question. The optical system under test must produce a real image at the image dissection surface of the image dissection means in order for readily evaluatable data to be obtained. The entire system is preferably computer controlled in order to obtain the necessary data quickly and accurately and to calculate the optical transfer function of the optical system under test on line. With this system both the modulation transfer function and the phase transfer function may be calculated. The digital computer can control the analyzer in any of several modes such as single scan, multiple scan with averaging of values to improve the signal to noise ratio and pass/fail production testing. output from the computer can be in any of several forms, such as displays on display devices, printouts or process control commands such as accept/reject commands in production testing.

REFERENCES:
patent: 2773413 (1956-12-01), Schade, Sr.
patent: 3519358 (1970-07-01), Kuttner
patent: 3563657 (1971-02-01), Kinseley et al.
patent: 3694088 (1972-09-01), Gallagher et al.

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