circle - create a circular aperture object.

Calling Sequence

[aperture]=circle(diameter)

Parameters

• diameter : the diameter of the aperture in meters.
• aperture : the circular aperture constructed.

Description

create a circular aperture object. notice: it is't diffrent to circ_ap , because it does not include the process to filter the field by the aperture.

Examples

	number=256;
	wavelength=1e-6;
	pixscl=0.1;sz=number*pixscl;
	dwf=begin(sz,wavelength);
	ap=circle(sz);
	dwf=aperture_transform(dwf,ap);
	dwf_fits(dwf,"circ_ap");
 

Author

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

See Also

circ_ap ,   circ_screen ,   rectang ,   annul_ap ,   hex_ap ,   spid_annul_ap ,   til_hex_ap ,   aperture_transform ,   aperture ,