When selecting and utilizing contactless temperature sensors, three major challenges are encountered:
Fill the Field
● Overcoming the Issue of Object Transparency
Achieve accurate emissivity adjustment
Field objects' thermal radiation "manifests" their surface temperature, which is very similar to wireless beacons. The difference lies in IRT measurements, where the thermal radiation comes from a known-sized spot on the object's surface. You need to capture all the radiation without any being obstructed along the way.
The diameter of spots at a specific distance (also the cross-sectional area of the "visual cone" at a given distance) is determined by the optical characteristics of the device. Generally, the further the distance from the sensor, the larger the spot diameter. The spot size is often represented by a ratio, such as 50:1 or 10:1. This indicates that the small target spot diameter is 1/50 or 1/10 of the distance from the sensor to the object of interest (Figure 1).
