THE infrared thermometers are tools essential to quickly measure the surface temperatures. However, they have their boundaries, and know how to use correctly an infrared thermometer is essential. Today we are going to tackle the subject of emissivity and manner including this factor key affects all readings Infrared.
Stay attentive for more than content to come on subjects like the cleaning and the storage infrared thermometers, the choice of the model adapted to your needs and thecalibration of the infrared thermometer.
Now let's go to technical…
Definition of infrared
Energy infrared (Ir) is part of the spectrum electromagnetic that we meet very frequently on a daily basis. She is invisible with the naked eye, but can be felt in the form of heat. THE influence infrared is one of main means of Thermal transfer, alongside the convection and conduction. All objects around you emit a influence infrared.
There infrared temperature measurement is influenced by three main elements: emissivity, there distance and theenvironment.
Definition of emissivity
Depending on the surface to which you point your infrared thermometer, you will observe a variation energy emitted. Emissivity corresponds to the capacity of a material to issue infrared energy. She is measured on a ladder ranging from 0.01 to 1.00. The more emissivity is close to 1.00, the more the material absorbed and only emits his own influence, without reflection exterior.
Emissivity on infrared thermometers
Each object emits, transmits and reflects energy. THE issue occurs when it takes determine the right area to measure, because its environment strongly influence the reading. If you don't define properly The emissivity of the surface to be measured, the temperature indicated by your infrared thermometer will be inaccurate.
Elements like plastic film, from the cellophane or a glass can distort the reading. For example, if you measure a food wrapped, the thermometer will only measure the temperature of thepackaging.
Here is an illustration of the difference in temperature measured on a cup in brushed steel one side of which has been painted in matt black. The change of value of emissivity generates variations important in readings temperature.
By simply adjusting emissivity, the measured temperature changes. This shows that if you know the surface measured and her emissivity, you will get a precise reading.
Distance, angle and environment
L'corner aimed with a infrared thermometer is a key factor To obtain a precise measurement. If you do not point directly to the surface, you may capture the temperature of the environment.
There distance also plays a role. Each infrared thermometer has a Distance/Target ratio specific. The smaller the report (for example 5:1), the wider the measured area. If there target surface East small, this can cause errors measurement by integrating the surrounding areas.
THE infrared thermometers may seem simple to use, but a good understanding of their operation guarantees reliable measures.
