CALIBRATION
iKon-L SECTION 8
Page 148
8.3.1.9 - Micrometer Setting
For certain non-motorized spectrographs, the system will calculate a Micrometer Setting that corresponds to
the Grating and the Center Wavelength / Center of Raman Shift you have chosen. The Micrometer Setting
allows you to manually adjust the angle of the diffraction grating (by means of the micrometer on the
spectrograph housing), so that light of the wavelength / Raman shift of your choice falls on the centre of the
CCD-chip.
The Micrometer Setting appears in a text box on the Spectrograph X-Calibration dialog box. You should use
this value to manually set the micrometer on the spectrograph.
NOTE: If you choose to enter a micrometer setting, the system will calculate a value for the Center
Wavelength / Center of Raman Shift and vice versa. You need enter only one of the two values.
Because Raman shift does not correlate linearly with wavelength (or pixel positions), the center column of pixels
on the CCD-chip (e.g. column 800 on a chip of 1600 pixels width) is likely to be represented off-center on the x-
axis of a data window linearly calibrated for Raman shift. Column and where appropriate, row number, are
expressed in the form [x,y] on the status bar along the bottom edge of the data window.
NOTES:
1. If you choose Raman Shift as the X-Axis label, the Center Wavelength text box is relabeled
Center of Raman Shift.
2. In the case of motorized spectrographs, the wavelength drive is under direct software control.
8.3.1.10 - Grating
From the scrollable drop-down list select the specification of the diffraction grating you are currently using.
Grating specifications are shown as a line density followed by (where applicable) a blaze wavelength.
8.3.1.11 - Close
To exit the Spectrograph X-Calibration dialog box, click Close.
NOTE: The details you supply regarding your spectrograph, including any retrieved data will appear by
default whenever you open the Spectrograph X-Calibration dialog box subsequently. You can change
them whenever you choose.
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