LumaSense Technologies InfraWin 5 - Manual (Page 15)

InfraWin 5 Manual Working with the Devices/ Parameters Window 15
3.2.1 Material
Under Material you have the option of storing names of different measuring objects along with
their emissivity values. Once this information is stored, you will be able to recall the item at any
time from the list of choices.
To add a material:
1. Click the Edit button next to the (mat.txt) drop-down list.
2. Enter the material in the form of “emissivity value”=”material”.
Example: 95.0=Water
3. Click the Add button to add the material to the end of the list
OR,
Click a location in the list where you want the material added and then click the Insert
button to insert the new material in that location on the list.
Note: InfraWin automatically records your materials to a file named mat.txt, which is
located in the InfraWin folder on your computer. (Refer to the notes in section 1.5 for more
information on how to access this folder.)
You can also choose to populate the mat.txt file directly. However, you will need to restart
the InfraWin program before your edits will appear in the list.
3.2.2 Emissivity
Emissivity is the relationship between the emission of a real object and the emission of a blackbody
radiation source (this is an object which absorbs all incoming rays and has an emissivity of 100%) at
the same temperature.
Different materials have different emissivities ranging between 0% and 100%. The emissivity is also
dependent upon on the surface condition of the material, the spectral range of the pyrometer, and
the measuring temperature. As such, the emissivity setting of the pyrometer has to be adjusted
accordingly.
To adjust the emissivity setting for the selected pyrometer, type a value in the input box and click
the OK button.
3.2.3 Transmittance
Transmittance is a parameter that can compensate for signal loss due to external windows etc. For
example, if the emissivity of the material is 0.6 and the transmittance of an additional window is
0.9, then the product would be 0.54, which is well inside the allowed range.
You will have the ability to make adjustments to the Transmittance values of window setting
based upon the limits of the selected device.
3.2.4 E-Ratio K
The emissivity slope is only used on ratio pyrometers and is only active if “Ratio temp” is selected as
the operating mode. When operating in 2-color (ratio) mode, the pyrometer is measuring
simultaneously with 2 sensors in adjacent wavelengths. In some cases, the emissivities of the two
wavelengths can differ so that it is necessary to correct the ratio of the two emissivities to get a
correct temperature reading.
It calculates the temperature by calculating a ratio with the radiation intensities of the two
wavelengths. This ratio technique eliminates a number of factors that degrade the accuracy of
conventional 1-color instruments.