Page 69 of 97
Title FireVu Detector Standalone Installation Manual
NetVu Ltd.
No 1 Thellow Heath Park, Northwich Road, Northwich, Cheshire. CW9 6JB
The patented Flame algorithm utilises the detection and measurement of pixels conforming with
the physical laws of a Black Body emitter. The ‘colours’ in a flame are the Black Body emissions
from soot particles. While there are a number of parameters available, they rarely require
adjustment, other than to ensure a match with the appropriate hardware / lens setup.
It is important that the correct calibrations are applied for a given lens, sensor, IR bandpass filter
etc, which are configured below the algorithm indication images.
QE File
–
The Quantum Energy transform file for the CMOS sensor
–
currently only this device
supported.
Lens File
–
Specific to the lens fitted.
IR Cut File
–
Specifies the transfer characteristics of the bandpass IR cut filter used. Currently, only
this IR filter is in use.
Thermal Threshold
–
Specified temperature above which, or below which, an alarm will be tripped.
Blue Error Range
–
a threshold for determining colour against intensity. It may be appropriate to
consider an increased value if flames with a chemical content resulting in a colour change are
anticipated.
Intensity Offset
–
This is the intensity transform value, in this case for a lens at F4.0. (Note that
Multi-Detectors an intensity offset of -27 is more typical as these operate at F1.4).
Intensity Error Range
–
Variation in intensity from the Planckian Locus value for that colour or
temperature. A higher value gives greater tolerance due to dirt or contamination on the Detector
lens, at the expense of a greater risk of false positives.
Green Adjust / Blue Adjust
–
Rarely requires adjustment
–
part of the overall colour and intensity