Optical testing of a gamma-ray telescope mirror

dc.contributor.author	Udupa, D. V
dc.contributor.author	Shukla, R. P
dc.contributor.author	Saksena, G. D
dc.date.accessioned	2007-05-09T05:46:39Z
dc.date.available	2007-05-09T05:46:39Z
dc.date.issued	1993
dc.identifier.citation	BASI, Vol. 21, pp. 527-530	en
dc.identifier.uri	http://hdl.handle.net/2248/1547
dc.description.abstract	A large size concave mirror for use in the gamma-ray telescope TACTIC was tested. Focal length of the concave spherical mirror of diameter 600 mm was measured to be 401.2 cm using the Ronchi test. The surface accuracy of the mirror was estimated to be about Lambda/2 by visual observation of the fringes obtained. The spot size of the mirror for a nearly collimated beam was measured to be about 0.5 mm, whereas the computed size of the spot for a spherical mirror is about 0.1 mm. The reflectivity of the mirror was measured to be about 83% in the visible region.	en
dc.format.extent	245424 bytes
dc.format.mimetype	application/pdf
dc.language.iso	en	en
dc.publisher	Astronomical Society of India	en
dc.subject	Gamma ray	en
dc.subject	Optical mirror	en
dc.title	Optical testing of a gamma-ray telescope mirror	en
dc.type	Article	en