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Measuring the Maximum Energy in Reflectance
Mode
The following procedure allows you to determine the maximum energy reaching the detector
when the ATR crystal is retracted. The value obtained here can be used to check that the
crystal is aligned correctly; see
1. Make sure that your spectrometer is switched on, and the source has warmed up.
2. Make sure that the microscope, PC, and stage controller are switched on and that
Spectrum software is running on your PC.
3. Ensure that the infrared beam is directed through the microscope and not the
spectrometer by using the Setup Instrument BeamPath tab.
4. Place the slide holding the reference mirror (supplied with the microscope) on the
sample stage.
5. Select the Reflectance sampling mode on the Setup Microscope Basic tab.
6. Look at the image in the Camera View pane and focus the beam on the surface of the
mirror using the Z-control on the joystick, or the Auto-Focus option.
There are usually dust particles or scratches on the surface that you can use to focus
on.
7. Enter 100 in the Aperture Width and Height text boxes on the Setup Microscope
Advanced tab.
8. Monitor the energy reaching the detector by selecting Monitor from the Measurement
toolbar and choosing the Energy option.
9. Record the energy level measured.
10. Click Halt.
Techniques for Collecting Spectra . 83
Checking the Infrared Alignment
on page 86 for details.
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