High-frequency optical Fourier transform analyzer for whole-field specklegram reconstruction

Journal Article · Sat Jun 01 00:00:00 EDT 1991 · Optical Engineering; (United States)

DOI:https://doi.org/10.1117/12.55851· OSTI ID:7175489

Gielisse, P J; Tu, M ^[1]

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1. Florida A and M Univ., Florida State Univ., Dept. of Mechanical Engineering, Tallahassee, FL (US)

Conventional optical systems used for whole-field specklegram reconstruction are limited by the size of the lenses, the uniformity of the collimated beam, and the off-axis capability. Outside the Fresnel and paraxial regions, the fringe patterns will suffer form various aberrations. The maximum obtainable sensitivity, therefore, is severely restrained. This paper discusses a new optical system and instrument-the high-frequency optical Fourier transform analyzer-specifically designed for whole-field specklegram reconstruction and can extrapolate the spectrum beyond the passband. It can extract information at any point within the hemisphere at which diffraction occurs. It also minimizes aberrations, allowing the sensitivity of speckle metrology to be increased to levels commensurate with those of moire interferometry.

• OSTI ID: 7175489
• Journal Information: Optical Engineering; (United States), Journal Name: Optical Engineering; (United States) Vol. 30:6; ISSN OPEGA; ISSN 0091-3286
• Country of Publication: United States
• Language: English

Related Subjects

440600* -- Optical Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
COHERENT SCATTERING
DESIGN
DIFFRACTION
EXTRAPOLATION
FOURIER TRANSFORM SPECTROMETERS
FREQUENCY DEPENDENCE
IMAGE PROCESSING
INHIBITION
INTERFEROMETRY
LENSES
MEASURING INSTRUMENTS
NUMERICAL SOLUTION
OPTICAL SYSTEMS
PROCESSING
SCATTERING
SENSITIVITY
SIZE
SPECTROMETERS