Table of Contents
Advertisement
User Guide
2.6 Installation Precautions
2.6.1 Vibration
It is highly recommended that the LSP
location where vibration is kept to a minimum.
2.6.2 Infrared reflections
All practical targets have some reflectivity within the infrared waveband. This
reflectivity increases as the target emissivity reduces (see Section 5.0). Therefore, the
scanner sees some radiant heat energy from reflections of surrounding objects, as well
as from the target source. This energy is not usually sufficient to have an effect on the
measurement, but take care to ensure that objects of similar or higher temperature to
the target are not placed where reflected energy may enter the scanner.
2.6.3 Compensating for losses in viewing windows
The emissivity control on the LSP
and window losses (such as when using the LSP Sealed to Process Flange). A simple
calculation provides the correct setting, as follows:
For example: if viewing a target of emissivity 0.8 through a sapphire window the
effective emissivity setting should be the product of the surface emissivity and the
transmission of the sapphire. Transmission is 100% minus the reflection loss of each
surface (7% + 7%) = 86% . The equivalent emissivity setting to overcome this loss
may be calculated as follows: 1 - (losses) / 100 which equals 0.86.
This value should then be multiplied by the value of target emissivity. Hence emissivity
setting = 0.86 x 0.80 = 0.69
Note
Ensure you choose an appropriate window material for the spectral response of
the LSP
scanner you have. For more information, contact AMETEK Land.
HD
Linescanning Thermometer is positioned in a
HD
can be set to compensate for target emissivity
HD
LSP
Linescanner Head
HD
Page 15
Hide quick links:
Advertisement
Table of Contents
