Understanding Infrared Thermography Reading 3

101. Sector - For a line scanner, a portion of the total scan angle over which
measurement is made at the target plane.
102. Seebeck effect - The phenomenon that explains the operation of thermocouples;
that in a closed electrical circuit made up of two junctions of dissimilar metal
conductors, a direct current will flow as long as the two junctions are at different
temperatures, The phenomenon is reversible: if the temperatures at the two
junctions are reversed. the flow of current reverses.
103. Sensitivity - See minimum resolvable temperature (difference), MRT(D).
104. Setpoint - Any temperature setting at which an activating signal or closure can be
preset so that. when the measured temperature reaches the setpoint, a control
signal, pulse or relay closure is generated.
105. Shock - A sudden application of force, for a specific time duration; also the
temporary or permanent damage to a system as a result of a shock.
106. Signal processing - Manipulation of temperature signal or image data for
purposes of enhancing or controlling a process. Examples for (1) infrared
radiation thermometer are peak hold, valley hold, sample hold and averaging.
Examples for (2) infrared scanners and (3) infrared imagers are usually referred
to as image processing and include isotherm enhancement. image averaging,
alignment, image subtraction and image filtering.
107. Slit response function - A measure of the measurement spatial resolution
(IFOV meas
) of an infrared scanner or imager.
Charlie Chong/ Fion Zhang