Analysis of light-scattering samples
Integrating sphere
96 Edition 09/2014 SPECORD S600 accessories
Loading powder samples
Powder samples must be loaded outside the SPECORD S600. Fill the sample
in the hollow (2 in Fig. 20-8) of holder (1 in Fig. 20-8). Smooth its surface and
slightly compress the powder.
Fig. 20-9 Sample carrier with powdered sample
Put the sample holder (1 in Fig. 20-8) into the recess at the bottom in the
bottom Spectralon hemisphere and slightly clamp it with the retaining clip (15 in
Fig. 20-7) by moving the guide of the clip along the clip holder.
Carefully insert the sphere body in the SPECORD S600 and move it to the right
up to the control unit.
Reflectance measurement procedure
The measurement procedure is similar to that of transmittance measurements.
If you want to measure the diffuse reflectance as relative quantity in order to
compare two only slightly different surfaces, it will do to perform a reference
measurement (Special Correction) with a purely white Spectralon standard and
subsequently take the sample measurement.
1. Switch on the SPECORD S600 and initialize it.
Before the determination of the integration time, you must not have run a dark
current measurement. If so, re
-initialize the device.
2. Enter the measurement parameters and determine the integration time with
the reference (e.g. white Spectralon insert).
3. Exit the measurement parameter window by storing the data and run the
reference measurement.
4. Load the sphere body with the sample in place of the reference. When
replacing the sphere body onto the carrying rails in the sample
compartment, make sure that it is in the same position as it was for the
reference measurement.
5. Start the measurement in the usual manner.
If you want to take very accurate diffuse reflectance measurements at a defined
wavelength, first calibrate the system using several certified standards same as
in Quantitative Analysis.
Then, as you are used to do from concentration determination in Quantitative
Analysis, measure the unknown sample based on the found calibration curve.
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