spid_annul_ap - construct a spidered annular aperture object.

Calling Sequence

[aperture]=spid_annul_ap(out_diameter,in_diameter,nspiders,spider_width)

Parameters

• out_diameter : the outer diameter in meters.
• in_diameter : the inner diameter in meters.
• nspiders : the number of the spiders.
• spider_width : the spider width in meters.
• aperture : a pointer, the size of the pointer equal to the structure APERTURE.

Description

construct a spidered annular aperture.

Examples

	number=256;
	wavelength=1e-6;
	pixscl=0.1;sz=number*pixscl;
	dwf=begin(sz,wavelength);
	ap=spid_annul_ap(sz,sz/2,4,sz/10);
	dwf=aperture_transform(dwf,ap);
	dwf_fits(dwf,"spid_annul_ap");
 

Author

Chen jingyuan, Gan guangyong (IAPCM, Beijing,China.)

See Also

circle ,   rectang ,   hex_ap ,   til_hex_ap ,   aperture_transform ,   aperture ,