Reasonable use of infrared thermometers to ensure temperature measurement accuracy
The most important factors in the operation of the infrared thermometer technology and its principle of emitted energy are the emissivity field of view, the distance to the spot and the position of the spot. Emissivity, all objects reflect, transmit, and emit energy, and only the emitted energy gives an indication of the object's temperature.
When an infrared thermometer measures surface temperature, the instrument receives all three types of energy. Therefore, all infrared thermometers must be adjusted to read only the emitted energy. Measurement errors are often caused by infrared energy reflected from other light sources. Some infrared thermometers can vary the emissivity, and emissivity values for various materials can be found in published emissivity tables. Other instruments were fixed with an emissivity preset of 0.95. This emissivity value is for the surface temperature of most organic materials, painted or oxidized surfaces, and is compensated by applying a tape or flat black paint to the surface being measured. When the tape or varnish reaches the same temperature as the base material, measure the temperature of the surface of the tape or varnish, which is its true temperature. The ratio of the distance to the spot. The optical system of the infrared thermometer collects energy from the circular measuring spot and focuses it on the detector. The optical resolution is defined as the ratio of the distance from the infrared thermometer to the object and the size of the spot to be measured (D :S). The larger the ratio, the better the resolution of the infrared thermometer and the smaller the measured spot size. Laser aiming, only to aid in aiming at the measuring point.
A recent improvement in infrared optics is the addition of a near-focus feature that provides accurate measurements of small target areas and is immune to background temperature effects. Field of view, make sure that the target is larger than the spot size of the infrared thermometer. The smaller the target, the closer it should be. When accuracy is critical, make sure the target is at least 2 times the spot size.
