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B.1.18 What does a broken fiber mean?
ASD.Document 600540 Rev. C
Normally, the Baud rate (4800), Data bits (8), Parity (none), and Stop bits (1)
settings will remain the same as what is displayed in the window. The Write
to log file is checked by default. When this field is checked and the GPS
fixed data is enabled, an entry will be made to a daily log file (i.e.
050302gps.log) when a spectrum is saved.
In the GPS Settings dialog box, enter communication settings appropriate
for your instrument controller's port intended for use as well as the GPS
device.
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Note:
The RS
settings on the instrument controller and the ports that are
used must match the actual port used as well as the settings of the
GPS device.
Connect an appropriate cable between the instrument controller's port and the
GPS device.
You may need a serial-USB converter depending upon the instrument
controller and GPS device.
Enable the GPS functionality in the RS
•
GPS->Enable... pull-down menu item.
•
Alt+G, E key combination.
Refer to the manual of your actual GPS device for further instructions
regarding usage and configuration.
The fiber-optic cable is made up of fifty-seven (57) randomly distributed glass
fibers.
•
19 fibers are 100 micron for the VNIR region.
•
19 fibers are 200 micron for the SWIR1 region.
•
19 fibers are 200 micron for the SWIR2 region.
Therefore, a single broken fiber results in a 5% reduction in the signal.
A few broken fibers is not critical when measuring reflectance, because this is
a ratio. Any noise introduced by the broken fibers in measuring the sample
were also present when measuring the white reference, and therefore cancels
out.
Radiance and irradiance are measured using the raw data and comparing to
numbers that exist in the calibration file. Therefore, a few broken fibers will
result in lower values.
The fibers are protected by a metal spiral inside the black cable casing. If
there are kinks in your cable, the fibers are not necessarily damaged.
However, if your cable has been crunched so severely that you are able to see
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Appendix B Reference Information
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application by selecting either:
FieldSpec® 3 User Manual
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