filter Script

Typically, the script is used to select the wavelength for forthcoming observations eg for J, H or K bands.

Currently (10/11/00) the following configurations are supported:
 

Setup	Pupil Stop	Filter Wheel 1	Filter Wheel 2
blank	blank1	blank2	blank4
z	cs	z	clear
j	cs	j	clear
h	cs	h	clear
k_s	cl	k_s	clear
k	cl	k	clear
fe2	cs	h	fe2
brg	cl	clear	brg
kcont	cl	clear	kcont
hcont	cs	h	hcont

Internally the script builds on the services provided by the Instrument Support Platform (ISP) fwheel1, fwheel2 and pstop commands.

Currently (10/11/00) INGRID has only been characterised for conditions where mechanism movement takes place sequentially. In order not to jeopardise the mechanical repeatability of  the instrument (particularly critical for the pupil stop) the decision has been taken to execute individual wheel movements one at a time. At a later date this limitation may be lifted, and the script may be recoded to allow movement in parallel, resulting in a threefold increase in mechanism set up times.