Accession Number : ADD017290

Title :   Method and Apparatus for Evaluating the Optical Spatial Response Characteristics of Objects.

Descriptive Note : Patent, Filed 8 Jun 92, patented 25 Oct 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Marchywka, Michael J ; Socker, Dennis G

Report Date : 25 Oct 1994

Pagination or Media Count : 4

Abstract : An apparatus and method for optically testing an object, such as an optical detector whose pitels 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. (MM)

Descriptors :   *BEAM FORMING, *OPTICAL DETECTORS, *PATENTS, FOURIER TRANSFORMATION, MIRRORS, TRANSFER FUNCTIONS, REFLECTION, LASER BEAMS, PATTERN RECOGNITION, PIXELS, OPTICAL FILTERS

Subject Categories : Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE