Why use non-contact infrared thermometer?
Non-contact infrared thermometers use infrared technology to quickly and easily measure the surface temperature of objects. Quickly obtain temperature readings without mechanical contact with the object being measured. Just aim, press the trigger and read the temperature data on the LCD display. Infrared thermometers are lightweight, small, easy to use, and can reliably measure hot, dangerous, or hard-to-reach objects without contaminating or damaging the object being measured. Infrared thermometers can take several readings per second, while contact thermometers take several minutes per second.
Infrared thermometers receive invisible infrared energy emitted by a variety of objects themselves. Infrared radiation is part of the electromagnetic spectrum, which includes radio waves, microwaves, visible light, ultraviolet, R-rays and X-rays. Infrared is located between visible light and radio waves. Infrared wavelengths are commonly expressed in microns, and the wavelength range is 0.7 microns-1000 microns. In fact, the 0.7 microns-14 micron band is used in infrared thermometers.
There is no objection to the understanding of infrared technology and its principles for its accurate temperature measurement. When the temperature is measured by an infrared thermometer, the infrared energy emitted by the object being measured is converted into an electrical signal on the detector through the optical system of the infrared thermometer. The temperature reading of the signal is displayed, and several factors determine the temperature measurement. The most important factors are emissivity, field of view, distance to the spot and location of the spot. Emissivity, all objects will reflect, transmit and emit energy, and only the emitted energy can indicate the temperature of the object. 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 a variety of materials can be found in published emissivity tables. Other instruments have a fixed emissivity preset of 0.95. This emissivity value is the surface temperature of most organic materials, paints or oxidized surfaces and must be compensated by applying a tape or flat black paint to the surface being measured. When the tape or paint reaches the same temperature as the base material, measure the temperature of the tape or paint surface to determine its true temperature. The ratio of distance to light spot. The optical system of the infrared thermometer collects energy from the circular measurement 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 measured light spot (D :S). The larger the ratio, the better the resolution of the infrared thermometer and the smaller the measured spot size. Laser aiming is only used to help aim at the measurement point. The latest improvement in infrared optics is the addition of a close focus feature, which provides measurement of small target areas and prevents the effects of background temperature. Field of view, ensure that the target is larger than the spot size when measuring by the infrared thermometer. The smaller the target, the closer you should be to it. When accuracy is important, make sure the target is at least 2 times the spot size.
