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 discrete form 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. © 1992 Optical Society of America.
Taylor, J., Driggers, R., Halford, C., Sanders, J., Griffin, S., & Wellfare, M. (1992). Comparison of continuous and discrete frequency-versus-radius frequency-modulated reticles. Applied Optics (10), 1638-1640. https://doi.org/10.1364/AO.31.001638