Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1992-06-08
1994-10-25
Turner, Samuel A.
Optics: measuring and testing
By particle light scattering
With photocell detection
356359, G01B 902
Patent
active
053594118
ABSTRACT:
An apparatus and method for optically testing an object, such as an optical etector whose pixels are an array of optically sensitive charged coupled devices. Two mutually coherent beams of light are interfered on the object to form an interference fringe pattern of sinusoidally varying intensity of preselected spatial frequency. The object's response at this spatial frequency is used to determine one point of the object's modulation transfer function at that frequency. This is preferably done by using the device's output to infer the coherence function of the fringe pattern, taking the Fourier transform of the coherence function, and determining the amplitude of the function at the spatial frequency of the fringe pattern. The process can be repeated for different spatial frequencies until one determines the entire modulation transfer function.
REFERENCES:
patent: 4496216 (1985-01-01), Cowan
patent: 5231468 (1993-07-01), Deason et al.
Marchywka Michael J.
Socker Dennis G.
Kim Robert
McDonnell Thomas E.
Miles Edward F.
The United States of America as represented by the Secretary of
Turner Samuel A.
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