Source Uv Control; 100-264V, 47/63 Hz Computer; 100-264V, 47/63 Hz Printer; Computer-Controlled Traversing System - Hunter SpectraProbe XE Hardware User Manual

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contaminants. FAILURE TO CLEAN THE AIR FILTER MAY DAMAGE THE SENSOR

Source UV Control

For the measurement of optical brighteners or UV-induced fluorescence, the calibration and control of

the source UV energy is important. UV-induced fluorescence can vary based on the geometry of the

instrument used, the spectral properties of the simulated source (usually D65), the condition of the

instrument's lamp, and the fluorescent characteristics of the sample. Using the variable UV filter

available on the SpectraProbe XE, the proper ratio of the energy in the UV region of the electromagnetic

spectrum to that in the visible region of the spectrum can be achieved and maintained. This improves

the agreement of the illumination between different instruments.

Transfer standards marked with known values are used to set the correct illumination conditions. These

standards are stable, white fluorescent plastic samples that have been calibrated at the factory. Special

algorithms in the SpectraProbe XE system adjust the UV content by adjusting the position of the UV

filter until the whiteness value read by the sensor agrees with the calibrated value for the tile. This

process should be carried out periodically since the UV output of the lamp will change as the lamp ages.

Instructions for using UV control are given in the software manual, since control of the UV filter is

maintained through the software.

Note: It is important to know what type of fluorescence is involved for the samples being measured.

Some materials fluoresce due to excitation by visible rather than ultraviolet wavelengths. The UV-

absorbing filter does not eliminate this type of fluorescence.

A computer that autodetects the available voltage (between 100 and 264 volts) and operates properly

using that voltage is available.

A printer that autodetects the available voltage (between 100 and 264 volts) and operates properly using

that voltage is available.

The traversing system provides a sensor mount on a rail mechanism that is driven side to side across the

production line. Traversing systems are valuable in the event that the conveying system exhibits a

cyclical side-to-side motion or belt wander. Rail assemblies are available in lengths between 60.00

inches (1825 mm) and 250.9 inches (6375 mm), in 12.75-inch (325 mm) increments.

11/02

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Introduction

1-13

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