M77781A
MS257
™ USB/RS232
MONOCHROMATOR AND SPECTROGRAPH
63
400 l/mm grating
1200 l/mm grating
Note
the
difference
in
wavelength
range
and
resolution of the 577 and
579 doublet.
A glass filter was used to
block the second order of
UV lines.
Figure 24: Grating Resolution
When spectrographs are used with diode arrays and CCD detectors, the resolution is often limited by the
pixel width. Nyquist sampling theory leads to calculating the resolution as if an exit slit were equal to two
pixels. Thus the limiting resolution of an MS257 with a diode array and 25
μ
m wide pixels would be about
0.2 nm.
