Abstract

Phase contrast photographs of diatoms are characterized from their Fourier transform taken through an optical diffractometer. The system output is placed on line to a PDP11/40 providing digital subtraction of two output spectral distributions due to different species. Differences obtained in this manner are used for characterizing various species. An average Fourier transform taken through coherent additions is also analyzed to find common features in a given set of diatoms.

© 1979 Optical Society of America

Coherent spatial filtering with simulated input

Hitoshi Fujii and Silverio P. Almeida
Appl. Opt. 18(10) 1659-1662 (1979)

Qualitative and semiquantitative Fourier transformation using a noncoherent system

G. L. Rogers
Appl. Opt. 18(18) 3152-3155 (1979)

Multispectral size-averaged incoherent spatial filtering

S. P. Almeida, S. K. Case, and W. J. Dallas
Appl. Opt. 18(23) 4025-4029 (1979)

Signal-detection tradeoff-analysis of optical vs digital Fourier transform computers

D. J. Granrath and B. R. Hunt
Appl. Opt. 18(1) 36-43 (1979)

Fourier transform method for calculating the transmittance of inhomogeneous atmospheres

William G. Mankin
Appl. Opt. 18(20) 3426-3433 (1979)