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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.

best infrared thermometer

Infrared Thermometer
Temperature monitoring functions. Infrared thermometers are used to test arriving travelers, at times of epidemics of diseases causing fever, such as Ebola virus disease and SARS coronavirus.
May be subject to error because of the reflection of radiation from a hotter
body the person holding the instrument–instead of radiated by the object and to an incorrectly.
There are many varieties of temperature-sensing devices that are infrared,
Most surfaces have high emissivity (over 0.9), and most IR

The distance-to-spot ratio (D:S) is the ratio of the

The infrared thermometers that are most common are the Place

Accuracy
By specifications including angular and precision coverage.
Include thermal imaging cameras and infrared scanning systems.
Infrared systems scan a larger area, typically by using what is a place thermometer pointed at a mirror that was rotating. These devices are
commonly used in manufacturing involving conveyors or “internet” procedures,
such as large sheets of glass or metal exiting an oven, fabric, and paper, or continuous piles of stuff along a conveyor
belt. Thermal imaging cameras or cameras are
infrared radiation thermometers that measure the temperature at points
over a relatively large area to create a two-dimensional image, called a
thermogram. This technology is
processor- and software-intensive than scanning or spot thermometers, and is
used for monitoring large areas. Applications include inspection/process excellent monitoring of processes perimeter monitoring used by military or security personnel, and equipment or enclosed space cold or hot spot monitoring for safety and efficacy maintenance purposes.
The design Basically consists of a lens to focus the
A camera with film and Acceptable lens,
For mobile and handheld use and as installations.
This is not sensitive to the and only Catches the near-infrared
Sometimes, Particularly near ambient temperatures, readings
An infrared thermometer is a thermometer which infers
Infrared thermometers are characterized
Infrared thermometer
Thermal radiation from room temperature objects.

Some circumstances are where the object to be
Thermometer or infrared pyrometer, which measures the temperature in a place on
a surface (actually a relatively small area dependent on the D:S ratio). A visible red dot usually projects on the center of the area being measured;
that identifies the place but plays no role in the measurement.
The angular area varies among instruments and is not
restricted to the spot.
Proportional to the fourth power of temperature, so when the measurement
surface has areas, the temperature may be higher
than the true temperature, and closer to fourth-power mean average.
Kinds of infrared thermometers
Distance to the diameter of the temperature measurement area and the measurement surface.
Thermometers rely on this simplifying assumption; however, non-reflective surfaces have not lower emissivity than reflective surfaces. Some sensors have an
adjustable emissivity setting, which can be set to measure the temperature of
surfaces that are non-reflective and reflective. A thermometer could be
used by applying a tape or paint, to assess the temperature of a surface, with some loss of precision.

Infrared radiation on a
detector, which converts the power after being compensated for ambient temperature to an electric signal which can be displayed. Temperature measurement is permitted by this without
contact with the object to be measured. A thermometer is
useful for measuring temperature under conditions where thermocouples or
other probe-type sensors cannot be used or don’t produce data.

Examples of use
According to the Stefan-Boltzmann Law power is
Used to measure the emissivity of a surface or to calibrate the sensor for a given surface. When the temperature of a surface is
accurately known (e.g. by measuring with a contact thermometer), then the
sensor’s emissivity setting can be adjusted until the temperature measurement
by the IR method matches the measured temperature by the contact method; the
emissivity setting will signal the emissivity of the surface, which may be
taken into account for later measurements.
A sensor with an emissivity setting Is Also
Temperature from a portion of the thermal radiation sometimes called
radiation emitted by the object being measured. They are called laser thermometers as a laser is used to help thermometers, or aim the thermometer or temperature guns, to describe the device’s ability to measure temperature. By knowing the amount of energy the temperature of the object can be determined.

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By | 2017-07-01T08:09:27+00:00 20. 6. 2017|Thermometers|Comments Off on Infrared thermometer

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