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Non Contact Infrared Thermometer consists of a lens to focus the infrared (IR) energy on to a detector, which converts the energy to an electrical signal that can be displayed in units of temperature after being compensated for ambient temperature variation. This configuration facilitates temperature measurement from a distance without contact with the object to be measured. As such, the infrared thermometer is useful for measuring temperature under circumstances where thermocouples or other probe type sensors cannot be used or do not produce accurate data for a variety of reasons. Some typical circumstances are where the object to be measured is moving; where the object is surrounded by an EM field, as in induction heating; where the object is contained in a vacuum or other controlled atmosphere; or in applications where a fast response is required. ">Infrared thermometers are very popular nowadays, and are used across various industries from automobile to fire and insurance inspections and quality control in manufacturing. They are also used in food safety department to check whether food is fully cooked. Infrared thermometers provide fast and instant temperature readings without even physically touching the object and hence they are also known as non contact thermometers. To use this thermometer all you need to do is aim the object, pull the trigger and read the temperature on the LCD display. Infrared thermometers are compact, light weight and easy to use and can safely measure hot and hazardous object without contaminating or damaging the object. Also, infrared thermometers provide many readings per second, as compared to contact methods where each measurement can take several minutes. Infrared thermometers do not actually measure temperature. Instead, they only measure infrared energy emitted by the object whose temperature need to be measured. Because infrared energy is emitted by an object as a function of temperature and emissivity, all infrared thermometers calculate a temperature value based upon an assumption concerning the emissivity character of the measured material. Emissivity So what is emissivity, it is a measure of the efficiency in which a surface emits thermal energy. It is defined as the fraction of energy being emitted relative to that emitted by a thermal black surface (a black body). A black body is a material that is a perfect emitter of heat energy and has an emissivity value of 1. A material with an emissivity value of 0 would be considered a perfect thermal mirror. In the real world there are no perfect ‘black bodies’ and very few perfect infrared mirrors so most objects have an emissivity between 0 and 1. In general, the higher the emissivity of an object, the easier it is to obtain an accurate temperature measurement using infrared. Basic design of Non Contact Infrared Thermometer consists of a lens to focus the infrared (IR) energy on to a detector, which converts the energy to an electrical signal that can be displayed in units of temperature after being compensated for ambient temperature variation. This configuration facilitates temperature measurement from a distance without contact with the object to be measured. As such, the infrared thermometer is useful for measuring temperature under circumstances where thermocouples or other probe type sensors cannot be used or do not produce accurate data for a variety of reasons. Some typical circumstances are where the object to be measured is moving; where the object is surrounded by an EM field, as in induction heating; where the object is contained in a vacuum or other controlled atmosphere; or in applications where a fast response is required.
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