Uncooled TIS is in the spotlight for its small size and low-voltage operation for personal and portable use compare to
other TIS. Generally, uncooled TIS using temperature control by TEC converts the gap between TEC temperature and
input-image into voltage by ROIC and outputs the analog image.
For cooled detector, it is possible to block undesirable infrared input since F number of the optics and the detector are
same but for uncooled detector, it is easy to get undesirable infrared input around because the F numbers are different.
It becomes more obvious when temperature gap between the equipment and background gets bigger.
For TIS, background temperature easily changes inside the system and around the detector because the radiating heat
from the electrical circuit inside the system is getting higher as usage time passes, and it makes worse the non-uniformity
output characteristics of the detector.
In particular, the temperature change of the system itself which depends on its setting position and other temperaturechanging
factors like electrical circuit inside the system make the additional non-uniformity worse which caused by
infrared photon radiates from structures which includes optics and detector.
This article would indicate the method of minimizing its image blurring which originates from the F number gap
between optics and detector.