a two-channel (Red/Blue), low- to medium-resolution grating spectrograph
a) DBSP; b) Raw spectra...vertical slit images in telluric lines, with bright knots from HH objects; c) Raytrace of DBSP Red, click-on to enlarge
[PLEASE WIDEN YOUR BROWSER PAGE UNTIL THE THREE PICTURES APPEAR SIDE BY SIDE]
The Double Spectrograph is a low-to-medium resolution (R ~ 1,000 to 10,000) grating instrument for the Palomar 200-inch telescope Cassegrain focus that uses a dichroic (at, e.g., 5200 Å) to split light into separate red and blue channels ("sides"), observed simultaneously. In addition to 128"-long slits of various widths, a multislit mechanism permits the deployment of 8 separate 15" slit segments that may be moved spatially by +/- 26". The DBSP may optionally be configured with a rotating-waveplate polarimeter (either 1/2- or 1/4-wave plates), with which all Stokes parameters may be measured.
Click below to seek info or return to the Palomar homepage. The "DBSP Overview" describes the instrument, with some theory of operation, and presents some detailed information needed while planning a run (e.g., choice of dichroic and gratings; calculation of grating angles). The "DBSP Cookbook" describes, in a step-by-step fashion, how the instrument is operated during a run...particularly the requisite computer commands.
For further info please contact: P200 Instrument Support Last modified: 21 Dec 2014