infrared thermometer

Infrared Thermometer Ho

Infrared Thermometer: What is an Infrared Thermometer? An infrared thermometer is a non-contact temperameasurement device. Infrared Thermometers detect the infrared energy emitted by all materials -- at temperatuabove absolute zero, (0Kelvin)-- and converts the energy factor into a temperature reading.

Buy Infrared Thermometers! Infrared Selection Guide (PDF File) Handheld Infrared Thermometers Infrared Thermocouples Fixed Mount Infrared Thermometer/ Transmitters Infrared Selection Guide Pocket/Stick-Type Infrared Thermometers Handheld Infrared Thermometers OMEGASCOPE Handheld Infrared Thermometers Fixed Mount Infrared Thermometer/Transmitters Infrared Blackbody Calibrators OMEGASAYS High Performance Talking Multimeter/Thermometers Benchtop Meters

Transactions: An Omega Technical reference Publication on Infrared (PDF file) Principles of Infrared Thermometry (PDF file) Article on Infrared Temperature Measurement (PDF file) Introduction to Infrared Pyrometers (PDF file) Infrared Temperature Measurement: Theory and Application Principles of Infrared Thermocouples (PDF file) Table of Total Infrared Emissivity (PDF file) Frequently Asked Temperature Questions (PDF file)

Introduction to Infrared ThermomeHow do infrared thermometers work? The most basic design consists of a lens to focus the infrared (IR) ea detector, which converts the energy to an electrical signal that candisplayed in units of temperature after being compensated for ambietemperature variation. This configuration facilitates temperature meafrom a distance without contact with the object to be measured. As sinfrared thermometer is useful for measuring temperature under circwhere thermocouples or other probe type sensors cannot be used oproduce accurate data for a variety of reasons. Some typical circumwhere the object to be measured is moving; where the object is surran EM field, as in induction heating; where the object is contained inor other controlled atmosphere; or in applications where a fast resporequired.

Common Questions When Using an Infrared Thermometer: Why should I use an infrared thermometer to measure temperaapplication? Infrared pyrometers allow users to measure temperature in applicatconventional sensors cannot be employed. Specifically, in cases demoving objects ( i.e., rollers, moving machinery, or a conveyor belt),non-contact measurements are required because of contamination hazardous reasons (such as high voltage), where distances are too where the temperatures to be measured are too high for thermocoucontact sensors. What should I consider about my application when selecting anthermometer? The critical considerations for any infrared pyrometer include field ofsize and distance), type of surface being measured (emissivity consspectral response (for atmospheric effects or transmission through stemperature range and mounting (handheld portable or fixed mountconsiderations include response time, environment, mounting limitaviewing port or window applications, and desired signal processing. What is meant by Field of View, and why is it important? The field of view is the angle of vision at which the instrument operadetermined by the optics of the unit. To obtain an accurate temperatthe target being measured should completely fill the field of view of tinstrument. Since the infrared device determines the average tempesurfaces within the field of view, if the background temperature is difthe object temperature, a measurement error can occur. OMEGA ofunique solution to this problem. Many OMEGA infrared pyrometers patented laser switchable from circle to dot. In the circle mode a bui

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10/1/2005http://www.omega.com/prodinfo/infraredthermometer.html

Introduction to Temperature Measurement Temperature Measurement and Control Glossary Practical Guidelines for Temperature Measurement Temperature Conversion Chart Between C and F

When selecting noncontact temperature measurement instruments, it is necessary to take into account not only the target and its emissivity, but also the surroundings and the invtervening atmosphere.

sighting creates a 12-point circle which clearly indicates the target ameasured. In the dot mode a single laser dot marks the center of thmeasurement area.

What is emissivity, and how is it related to infrared temperaturemeasurements? Emissivity is defined as the ratio of the energy radiated by an objecttemperature to the energy emitted by a perfect radiator, or blackbodsame temperature. The emissivity of a blackbody is 1.0. All values ofall between 0.0 and 1.0. Most infrared thermometers have the abilitcompensate for different emissivity values, for different materials. Inhigher the emissivity of an object, the easier it is to obtain an accuratemperature measurement using infrared. Objects with very low em(below 0.2) can be difficult applications. Some polished, shiny metasuch as aluminum, are so reflective in the infrared that accurate temmeasurements are not always possible. Five Ways to Determine Emissivity There are five ways to determine the emissivity of the material, to enaccurate temperature measurements:

1. Heat a sample of the material to a known temperature, usingsensor, and measure the temperature using the IR instrumenadjust the emissivity value to force the indicator to display thetemperature.

2. For relatively low temperatures (up to 500F), a piece of maswith an emissivity of 0.95, can be measured. Then adjust thevalue to force the indicator to display the correct temperaturematerial.

3. For high temperature measurements, a hole (depth of which times the diameter) can be drilled into the object. This hole ablackbody with emissivity of 1.0. Measure the temperature inthen adjust the emissivity to force the indicator to display the temperature of the material.

4. If the material, or a portion of it, can be coated, a dull black pan emissivity of approx. 1.0. Measure the temperature of the adjust the emissivity to force the indicator to display the corretemperature.

5. Standardized emissivity values for most materials are availabpages 114-115). These can be entered into the instrument tothe materials emissivity value.

How can I mount the infrared pyrometer? The pyrometer can be of two types, either fixed-mount or portable. Funits are generally installed in one location to continuously monitor aprocess. They usually operate on line power, and are aimed at a sinThe output from this type of instrument can be a local or remote disp



with an analog output that can be used for another display or controBattery powered, portable infrared guns are also available; these all the features of the fixed mount devices, usually without the analocontrol purposes. Generally these units are utilized in maintenance,quality control, and spot measurements of critical processes.

Infrared Thermometer Types

Handheld Infrared ThermometersHandheld infrared thermometers are one of the most popular types of infrared pyrometer. Thcommonly used for portable applications although some models also feature an integral tripoOMEGA offers a large variety of infrared thermometers in various shapes and form factors. MOMEGA handheld infrared pyrometers feature OMEGA's patented Circle Dot/Circle Laser sigwhich clearly outlines the field of view of the thermometer.

Pocket/Stick-Type Infrared ThermometersPocket or stick type infrared thermometers are extremely compact. They are normally small ebe carried in a shirt pocket.

Infrared ThermocouplesInfrared thermocouples are small low cost infrared sensors. They are unique in that they are powered and produce an output that mimics a thermocouple sensor.

Fixed Mount Infrared Thermometer/TransmittersFixed mount infrared thermometers are commonly used in industrial processes where the thermometer can be mounted in a stationary position.

Two Color-Ratio ThermometryGiven that emissivity plays such a vital role in obtaining accurate temperature data from infrathermometers, it is not surprising that attempts have been made to design sensors which woumeasure independently of this variable. The best known and most commonly applied of theseis the Two Color-Ratio Thermometer. This technique is not dissimilar to the infrared thermomdescribed so far, but measures the ratio of infrared energy emitted from the material at two wavelengths, rather than the absolute energy at one wavelength or wave band. The use of th"color" in this context is somewhat outdated, but nevertheless has not been superseded. It orin the old practice of relating visible color to temperature, hence "color temperature."

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