Comparison of continuous and discrete frequency-versus-radius frequency-modulated reticles.
We present a general expression for the transmission function of the discrete frequency-versus-radius reticle and compare such a reticle with the more common continuous reticle. A discrete form of the frequency-versus-radius reticle has an integer number of chopping cycles on a single radius. The discreteform limits the resolution of the reticle in the radial direction, but this limit is not severe for small-target images. However, since no phase reversal occurs, electronic processing is simplified.
Taylor
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Driggers
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Halford
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Sanders
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Griffin
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Wellfare
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