Device-Hardware
Number
Table
Hardware Number
0
1
2
5
6
7
9
10
13
15
270M
Rapid Scanning Imaging Spectrograph
Device
Monochromator motor
Front Entrance Slit
Front Exit Slit
Entrance Mirror
Turret
Front Entrance Shutter
Side Entrance Slit
Side Exit Slit
Exit Mirror
Side Entrance Shutter
A step is the smallest increment that a device can be moved
by
the driver.
For a sine drive monochromator,such as the 270M, one mono step is proportional
to
change in wavelength. However, one can determine the proper step position value for
a given wavelength as follows:
Given:
lambda = desired wavelength.
steps per unit = number
of
steps per unit.
groove density = current groove density
of
the grating.
sgroove_density = standard groove density
of
the grating (always 1200 for a 270M}.
Find:
step = step position
to
move monochromator
to
yield the desired wavelength.
Solution:
step = lambda * steps _per_ unit * ·(groove_ density / sgroove _ density}
Example:
_
_ Let the desired wavelength be 570 nm and let there be 32 steps per nm.· Find the
required step position if the groove density is 300 and the· standard groove density is
1200.
step = 570 nm * (32
steps/nm}
* (300/1200} = 4,560
For slits, each step is proportional
to
a change in slit width. Using information
provided, one can determine the proper step for a desired slit width as follows:
64
Revised November 24.
1992
Leica Microsystems, Inc.'s Ex. 1033
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