The field of view (FoV) determines the flame and smoke size for the fire to be detected.
For example, to detect fire in a wider field of view, the smoke and flame size needs to be bigger.
Whereas a smaller flame and smoke can be detected in a narrow field of view.
The FoV is measured in millimeters (mm): is the calculation of the optical distance from the point where light converge to form a sharp image of an object to the sensor.
The focal length tells us the angle of view:
Short focal length means wide angle of view
Long focal length means narrow angle of view and high magnification
Here it is the difference between a 14mm lens and 140 mm lens
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