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Prevalence of infrared thermometer especially digital infrared thermometers, across various sectors is becoming prominent day by day. After the Attack of Covid-19, this device that is available in a few basic shapes and design (well basically 2 models for each type :)) detects temperature from a portion of the thermal radiation emitted by the object being measured. This thermometer, also called laser thermometer does not need to physically touch but only scan the surface of the object whose temperature is being measured. Besides, they take less than a second to read and report the temperatures.

How do infrared thermometers work?

An infrared thermometer functions by using a series of lenses to collect infrared light that is then detected by sensors within the thermometer and measured. The thermometer projects the reading in either Celsius or Fahrenheit or both digitally, depending on the model. Portable infrared thermometer and permanent infrared thermometers are the two types available in the market, among others. A portable device is small, most commonly used in a doctor’s office to read the patient’s temperature. Permanent thermometers are larger, mounted devices that function as infrared cameras and are designed to constantly monitor an area.

As industries strive for more accuracy and sophistication, they are also adapting to changing trends and innovative technology. Infrared thermometers have taken the place of conventional thermometers in a wide range of industries as they offer accuracy and do not require physical contact. This quality of the thermometer is convenient in order to check the high or cooling temperature of materials in the manufacturing sectors like that of plastics, metals and ceramics. These are ideal for cooking and baking sectors as well as for medical purposes. Since the thermometers are no-contact devices, they are particularly useful for measuring and recording the temperature of sick babies. An infrared thermometer comes in handy around the house or a small establishment while fixing appliances, especially those related to heat and electricity.

An infrared thermometer is a thermometer which infers temperature from a portion of the thermal radiation sometimes called black-body radiation emitted by the object being measured. They are sometimes called laser thermometers as a laser is used to help aim the thermometer, or non-contact thermometers or temperature guns, to describe the device’s ability to measure temperature from a distance. By knowing the amount of infrared energy emitted by the object and its emissiveness, the object’s temperature can often be determined within a certain range of its actual temperature. Infrared thermometers are a subset of devices known as “thermal radiation thermometers”.

non contact thermometer

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— rather than radiated by the object being measured, and to an incorrectly assumed emissivity.

The design essentially 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 the object to be measured. A non-contact 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 electromagnetic field, as in induction heating; where the object is contained in a vacuum or another controlled atmosphere; or in applications where a fast response is required, the accurate surface temperature is desired or the object temperature is above the recommended use point for contact sensors, or contact with a sensor would mar the object or the sensor, or introduce a significant temperature gradient on the object’s surface.

Infrared thermometers can be used to serve a wide variety of temperature monitoring functions. A few examples provided include detecting clouds for remote telescope operation, checking mechanical or electrical equipment for temperature and hot spots, measuring the temperature of patients in a hospital without touching them, checking heater or oven temperature, for calibration and control, checking for hot spots in fire-fighting, monitoring materials in processes involving heating or cooling, and measuring the temperature of volcanoes. At times of epidemics of diseases causing fever, such as SARS corona

non contact thermometer

virus and Ebola virus disease, infrared thermometers have been used to check arriving travelers for fever.

There are many varieties of infrared temperature-sensing devices, both for portable and handheld use and as fixed installations.

Thanks to our wikipedia team and our virtual friend Said Tahir for his over-scientific article that helped us to collate these paragraphs.