Gentec-EO Accessories for Beam Diagnostics - Manual (Page 17)

Accessories for Beam Diagnostics Revision 1.2 17
Figure 11: Beamage-3.0-IR and IR Adaptor Excitation Spectrum
Important Steps to Follow When Using the IR Adaptor:
1. Remove the ND4.0 filter from the camera
Remove the ND4.0 filter that is supplied with the Beamage-3.0 camera before using the IR Adaptor.
2. Determining and Entering the Pixel Mulitplication Factor
The Pixel Multiplication of the IR Adaptor at the focus point is 3.29.
Enter this value in the software below Magnifying Lens. The on-screen dimensions will now be correct.
3. Screw the ND filter in front of the IR adaptor.
Depending on the laser source’s power, screw the appropriate ND filter in front of the IR adaptor.
4. Make a Background Subtraction or Select an Active Area
Since this optical component is suitable for
½’’ sensor format only (does not work for ⅔’’ sensor format), a portion
of the sensor will not be available when using it. Therefore, it is necessary to make a background subtraction or to
select an active area on the sensor via the Beamage-3.0 software.
5. Apply the Despeckle Filter
The phosphor coated glass used inside the IR Adaptor produces speckles that may alter the intensity profile of
the beam and thus affect the accuracy of the measurements.
Therefore, it is important to use the Despeckle Filter when viewing a beam with the IR Adaptor because it will
remove speckles and noise related to transmission of light through the phosphor coating.
The Despeckle filter is a new and aggressive spatial filter that performs a 9x9 pixels simple averaging around
each pixel, with all of the pixels having the same relative weight (1/81).