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infrared thermometer

Infrared thermometerInfrared thermometerFrom Wikipedia, the free encyclopedia[hide]This article has multiple issues. Please help discuss these issues on the talk page or improve it. (Learn how and when to remove these template messages)This article needs additional citations for verification. (January 2015)This article may require cleanup to meet Wikipedia’s quality standards. (June 2011)
An infrared thermometer.
A sailor checking the temperature of a ventilation systemAn infrared thermometer is a thermometer which infers temperature from a portion of the thermal radiation called blackbody radiation emitted by the object being measured. The temperature of the object can often be determined by knowing the amount of infrared energy emitted by the object and its emissivity. Infrared thermometers are a subset of devices known as “thermal radiation thermometers”.Sometimes, especially near ambient temperatures, readings may be subject to error due to the reflection of radiation from a hotter body—even the person holding the instrument[citation needed]—rather than radiated by the object being measured, and to an incorrect assumed emissivity.The design consists of a lens to focus the infrared thermal radiation on to a detector, which converts the radiant power to an electrical signal that can be displayed in units of temperature after being compensated for ambient temperature. This permits temperature measurement from a distance without contact with all the object. A non-contact infrared thermometer is useful for measuring temperature under circumstances where thermocouples or other probe-type sensors can’t be used or don’t produce data that is accurate for a variety of reasons.Contents [hide]1 Examples of use2 Accuracy3 Types of infrared thermometers4 Gallery5 See also6 References7 External linksExamples of use[edit]Infrared thermometers might be used to serve a wide variety of temperature monitoring functions. At times of epidemics of diseases causing fever, such as SARS coronavirus and Ebola virus disease, infrared thermometers are used to check arriving travellers for fever.[1][2][3]There are many varieties of infrared temperature-sensing devices, both for handheld and portable use and as fixed installations.Accuracy[edit]Specifications including angular and accuracy coverage characterise infrared thermometers. Simpler instruments may have a measurement error of about ±2 °C/±4 °F).The distance-to-spot ratio (D:S) is the ratio of the distance to the measurement surface along with the diameter of the temperature measurement area. For instance if the D:S ratio is 12:1, the diameter of the measurement area is one-twelfth of the distance to the object.Based on the Stefan-Boltzmann Law, radiant power is proportional to the fourth power of temperature, so when the measurement surface has both hot and cold areas, the indicated temperature may be higher in relation to the actual average temperature, and closer to fourth-power mean average.[4]Most surfaces have high emissivity (over 0.9), and most IR thermometers rely on this simplifying assumption; however, reflective surfaces have lower emissivity than non-reflective surfaces. Some sensors have an adjustable emissivity setting, which may be set to measure the temperature of reflective and non-reflective surfaces. A non-adjustable thermometer could be used to measure the temperature of a reflective surface by applying a non- reflective paint or tape, with some loss of accuracy.A sensor with an adjustable emissivity setting can be used to calibrate the sensor for a given surface, or to measure the emissivity of a surface. When the temperature of a surface is accurately known (e.g.Types of infrared thermometers[edit]The most common infrared thermometers are the spot infrared thermometer or infrared pyrometer, which measures the temperature at a spot on a surface (actually a relatively small area determined by the D:S ratio). These usually project a visible red dot onto the middle of the area being measured; this identifies the spot but plays no part in the measurement. The actual angular area being measured varies among instruments and is not restricted to the spot that is visible.Related equipment, although not strictly thermometers, infrared thermal imaging cameras and include scanning systems that are infrared. Infrared scanning systems by using what’s a spot thermometer, scan a larger area, typically pointed at a rotating mirror. These devices are widely used in manufacturing involving conveyors or “web” processes, like large sheets of glass or metal exiting an oven, fabric and paper, or continuous piles of material along a conveyor belt. Infrared thermal imaging cameras or infrared cameras are essentially infrared radiation thermometers that measure the temperature at many points over a large area to generate a two-dimensional image, called a thermogram, with each pixel. This technology is more processor- and software- intensive than spot or scanning thermometers, and is used for monitoring large areas.This isn’t sensitive to the thermal radiation from room temperature objects and only captures the near infrared.

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By | 2017-06-24T12:14:35+00:00 20. 6. 2017|Thermometers|Comments Off on Infrared thermometer

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