Uncooled microbolometer devices need to integrate signal for a
portion of each frame time. The terms exposure setting, integration
time, and shutter speed are analogous to the time constant, which is
the metric that FLIR uses for its uncooled sensors. The time constant
is fixed in the design of the readout integrated circuit (ROIC). An
exact time constant value is not specified because there can be slight
variations in the manufacturing process of the readout integrated
circuits (ROICs) used in FLIR`s uncooled devices.
The thermal time constant of Tau2 and Quark2 is estimated to
12 milliseconds. For the Tau2 640, the time constant has been measured
by an agency of the U.S. government to be about 10 milliseconds.
Boson`s thermal time constant is about 8 milliseconds.
NOTE: The time constant is not a specified, controlled, tested, or reported parameter, and may vary slightly from camera to camera.