FMX 320/FMX 640 SERIES USER MANUAL
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11-2-3 Ambient Temperature
The Ambient Temperature, which is often referred to as the background, is the
temperature of the air surrounding the target object. This number can affect
surfaces whose energy will hit the face of the target object and reflect from it
into the camera’s field of view.
Entering a numerical value in the appropriate input box will adjust the
temperatures of an image accordingly.
11-2-4 Distance and Angle of Capture
Although distance usually will not affect the temperatures measured by the
software it can be helpful to know the distance to the target location. Generally,
the further away the IR sensor is from the target/background area, the less
thermal contrast seen in the image.
Angles of reflection can also affect the contrast. This is significant because when
the IR sensor is operated at low angles over water there may be no perceived
thermal difference between the horizon and the water, i.e. the horizon can seem
to disappear. Users can change their angle by changing where they stand or by
attaching a camera to an unmanned aerial system.
While there is an input box for Distance there is not an input for Angle. Use the
Comments section to create notes.
11-2-5 Humidity
Humidity remains in the atmosphere even on bright days. Water of all three
states can be found naturally in the atmosphere: liquid (rain, fog, and clouds),
solid (snowflakes, ice crystals), and gas (water vapor). Water in any state is
an obstacle to accurate temperature measurements. When the wave passes
through the water particles, a part of its energy is absorbed and a part is
scattered. Therefore the electromagnetic wave is attenuated.
Users can correct for atmospheric attenuation due to humidity by defining the
value using the input field.
Use the input fields
to enter information
and numerical data.
Users can include data
in reports. To toggle
data on/off click the
squares. Boxes are
green when selected.
