beamDiskOverlap: Gaussian beam and disk overlap with shift

Description Usage Arguments Details Value Author(s) References Examples

View source: R/beamDiskOverlap.R

Description

Calculate the overlap integral of a 2-D Gaussian beam and a uniform disk, including a shift between the centers of the beam and disk.

Usage

1
beamDiskOverlap(s = 0, r = 1, theta.fwhm = 1)

Arguments

s

Shift between centers

r

Disk radius

theta.fwhm

Gaussian beam FWHM

Details

Converts the 2-D integral to 1-D for speed. Use consistent units.

Value

Value of the overlap integral, normalized to unity for a beam much smaller than the disk.

Author(s)

Andrew Harris

References

"Telescope illumination and beam measurements for submillimeter astrononomy," A.I. Harris, Internat. J. IR and mm Waves, 9, 231 (1988)

Examples

1
2
s <- seq(0, 10, 0.1)
plot(s, beamDiskOverlap(s, 4, 1), t='l', col=4)

astroFns documentation built on May 29, 2017, 3:02 p.m.

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