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Thermal imager technical indicators
Aug 14, 2018

1, thermal sensitivity / NETD

The thermal imager can distinguish the small temperature difference, which affects the degree of imaging to some extent. The higher the sensitivity, the better the imaging effect, and the more the specific location of the fault point can be distinguished.

2, infrared resolution

Infrared resolution refers to the detector pixel of the thermal imager. Similar to visible light, the higher the pixel, the sharper and more delicate the picture. The higher the pixel, the more temperature data is acquired.

3, field of view / FOV

The horizontal and vertical angles of the image on the detector. The larger the angle, the wider the view, such as the wide-angle lens. The smaller the angle, the smaller it is seen, such as a telephoto lens. Therefore, it is very important to choose the right lens for different occasions.

4, spatial resolution / IFOV

IFOV refers to the angle that can be imaged on a single pixel, because the angle is too small, so it is expressed in milliradians mrad. The IFOV is affected by the detector and the lens to find that the lens is unchanged. The higher the pixel, the smaller the IFOV. On the contrary, the pixels are unchanged, and the smaller the field of view, the smaller the IFOV. At the same time, the smaller the IFOV, the clearer the imaging effect.

5, temperature range

The device can measure from the lowest temperature to the highest temperature range, and can have multiple temperature ranges within the range, which need to be set manually. For example, the temperature range of FOTRIC 226 is -20 °C ~ 650 °C, and the temperature range is -20 °C ~ +150 °C, 0 °C ~ 350 °C and 200 °C ~ 650 °C. Try to select a small range that meets the requirements for testing. If you are testing the target of 60 °C, the range of -20~150 °C will be more clear than the range of 0~350 °C.

6, full radiant thermal image video stream

A video stream that stores temperature data for each pixel at each frame, the full-radiation video can be analyzed for post-temperature changes, and any temperature analysis can be performed for each frame of the image.