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Spectrometer benchmark

A set of tests were performed in order to understand the repetitivity, reprodutibility, and the effects of some components of the spectrometer in the transmittance measurements of PWO crystals with the Lambda 750 UV/VIS/NIR spectrometer at CUA.

Two types of measurements are planned to be performed with this spectrometers to quantify the crystals transmittance: longitudinal measurement and transverse scan along crystal length. For each of these, a set of benchmark tests were done as described in the following subsections.

Transverse Transmittance

• Cloth to cover the spectrometer

This test allowed us to make sure there is no effect on the transmittance measurements when working with a cloth covering the sample compartment instead the spectrometer's lid. Using the cloth will be necessary since the 20 cm crystals can only be fully scanned in the spectrometer if the lid is removed, since the sample compartment is not big enough.

Measurements:

• • 1 - Measure transmittance of a 20-cm BTCP crystal installed at the center of the compartment with the compartment cover installed and closed.
  • 2 - Measure transmittance of 20-cm BTCP crystal installed at the center of the compartment without the compartment cover and a black cloth covering the setup. Do not move the crystal between point (1) and this measurement. This test is done without the diagonal slider. Compare the result with that of the previous point. If there is significant noise in the data, check the positioning of the black cloth.