Instruments

The WSO-UV telescope feeds two main instruments: the spectrographs unit (WUVS) and field camera unit (FCU), as well as the Fine Guidance System (FGS). WSO-UV instrumentation is designed to provide:

  • Spectroscopic observations in the 115-315 nm range with dispersion 50,000.
  • Long slit spectroscopy with spectral dispersion 1,000.
  • Imagery of space objects with high resolution (up to 0.1 arcseconds in the 115-176 nm range) and wide field imaging in the 200-600 nm range.

The focal plane layout is shown in figure below. The Fine Guiding Sensors are located in a circle of radius 24.25 arcmin around the T-170M optical axis. WUVS entrace slits are intercalated between them, to guarantee accurate guiding during the foreseen long spectroscopic observations. The FCU picks off the beam from the telescope axis but requires an independent refocussing mechanism.

Focal plane layout. Entrance slits to WUVS and fine guiding sensors are marked. The location of FCU pick-off mirrors is also indicated