Fotric 320F Series, User Manual

Page: 118 / 123

114
lens can measure the temperature distribution of a larger field, and a telephoto
lens can observe finer detail in distance. Germanium, silicon, and zinc selenide
are good materials for making camera lenses because they have high infrared
transmittance.
Field of View (FOV)
Field of view refers to the vertical and horizontal angle objects project themselves
in the thermal imager
MFOV
The MFOV is the minimum pixel range in which a thermal detector can accurately
measure temperature. There are two types: MFOV=1, and MFOV=3×3=9
。
Thermal Image
Thermal Image displays surface temperature distribution of an object.
By receiving the object’s radiation energy, the thermal imager converts pixels’
temperature values into visible colors on the matrix coordinates. Each pixel
represents a temperature measuring point on the object’s surface.
Measurement Range
Measurement Range refers to the temperature range that a thermal imager can
accurately measure and record. Outside of the measuring range, the device will
neither be able to properly display the information nor guarantee the accuracy
of the measurement.
NETD
NETD stands for sensitivity (also known as Noise Equivalent Temperature
Difference). It describes the minimal temperature difference the thermal imager
can detect. The smaller the NETD, the more sensitive the thermal imager, and the
image will be clearer.
Accuracy