The thermal imager's temperature measuring range is frequently another standard that consumers take into account. Everyone wants the thermal imager's temperature measurement range to be as wide as feasible. Do you, however, know what influences the thermal imager's ability to determine temperature at a distance?
1、Lens focal length
The focal length of the lens is crucial in determining how far a thermal imager can measure temperatures. The size of the image the target creates is directly determined by the focal length of the lens. The imaging distance increases with increasing focal length, while the field of vision decreases. In plain English, a thermal imager can see farther with a longer focal length, but the viewing range (horizontal viewing angle) gets smaller.
2. Resolution
The five grades of thermal imager resolution currently available on the market are 80*60, 160*120, 384*288640*480, and 1024*768, with the middle three categories seeing the greatest usage. As was already explained, you must make sure that it reaches 9 pixels in order to measure the temperature. This demonstrates that resolution and temperature measurement range have a significant impact and are inversely proportional.
3. Detector performance
The focal length of the lens determines the detection distance of the thermal imager theoretically. Another factor that plays an important role in practical applications is the performance of the detector. The focal length of the lens only determines the size of the image and the number of pixels occupied, and the performance of the detector determines the image quality, such as the degree of blur, the signal-to-noise ratio, and so on. Detector performance can be analyzed in terms of pixel size, thermal sensitivity, and signal processing. The smaller the pixel size, the smaller the spatial resolution and the larger the detection distance. The thermal sensitivity and signal processing of the detector determine the clarity of the image. If the thermal sensitivity of the detector is not high, the method of increasing the aperture of the lens is adopted to improve the image effect.
