This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision | ||
cso:telescope:secondary [2012-09-25 09:48] sradford |
cso:telescope:secondary [2014-08-26 21:10] (current) admin |
||
---|---|---|---|
Line 1: | Line 1: | ||
+ | ====== Secondary mirror ====== | ||
+ | The CSO has a wobbling (chopping) secondary mirror to switch the beam back and forth during observations of compact sources. | ||
+ | The secondary controller combines an digital servo loop with an automatic tuning algorithm. | ||
+ | The mirror position is displayed in a window on the remote observing desktop. | ||
+ | |||
+ | {{secondary.png}} | ||
+ | |||
+ | ==== UIP commands ==== | ||
+ | |||
+ | To start the secondary wobbler, \\ ''__UIP__> **secondary //throw// //frequency//** '' | ||
+ | * //throw// is the the beam separation [arcsec]. | ||
+ | * For the switching //frequency// [Hz], avoid 1.00 Hz or integer submultiples. Use an odd value instead, such as 0.491 Hz. | ||
+ | * Tune the secondary mirror wobbler while the telescope is either stationary or sidereal tracking, i. e., not slewing. | ||
+ | To stop the secondary wobbler, \\ ''__UIP__> **secondary /stop ** '' | ||
+ | |||
+ | ==== Reference ==== | ||
+ | |||
+ | **Controlling a telescope chopping secondary mirror assembly using a signal deconvolution technique ** \\ Houde, M., Holt, L. C., Yoshida, H., Nelson, P. M. \\ 2003 Rev. Sci. Instr. 74, 3802 [[http://adsabs.harvard.edu/abs/2003RScI...74.3802H|ADS]] |