A infrared thermometer is a non-contact thermometer that uses infrared radiation to measure surface temperature. This device is ideal for applications where contact temperature measurement is impossible or dangerous.

A infrared thermometer captures the infrared radiation emitted by a given object and converts it into temperature. These devices feature a detector that focuses the infrared radiation onto a sensor, which then processes it into an electrical signal.

There are several types of infrared thermometers, including:

• Industrial infrared thermometers: used in industry to measure the temperature of machinery, equipment, and processes.

• Laboratory infrared thermometers: used in laboratories for precise temperature measurements.

• Construction infrared thermometers: used to measure the temperature of walls, roofs, insulation, and other structural components.

• Food infrared thermometers: used to monitor food temperature in the food industry.

• Medical pyrometers: used to measure body temperature. Medical infrared thermometers are mainly used in medicine to measure patients' body temperature to diagnose illnesses or monitor the progress of treatment. Increasingly, medical pyrometers are being used in homes instead of traditional contact thermometers.

Advantages:

- Non-contact temperature measurement

- Fast and easy measurement

- Wide measurement range

- Ability to measure temperature in hard-to-reach places

Disadvantages:

- Measurement errors can be caused by surface emissivity, ambient temperature, dust, smoke, or water vapor

- Higher costs compared to traditional thermometers

When choosing a infrared thermometer, several factors should be considered, such as:

- Measurement range

- Measurement accuracy

- Surface emissivity

- Response time

- Additional functions (e.g., laser target indicator, measurement memory)

Before using an infrared thermometer, please read the user manual. Here are some general tips:

- Point the infrared thermometer at the object whose temperature you want to measure.

- Make sure that the field of view of the infrared thermometer covers the entire object.

- Hold the infrared thermometer in a stable position during measurement.

- Take several measurements at different points on the object.

- Store the infrared thermometer in a clean and dry place.

- Protect the infrared thermometer from shocks and drops.

- Regularly clean the lens of the infrared thermometer, without using chemicals.

- Do not use the infrared thermometer in high ambient temperatures.

- Measure high-temperature objects from a safe distance.

- If the device is not used, remove the batteries from it.

Prices of infrared thermometers range from a few dozen PLN to several thousand PLN. The price depends on the type of infrared thermometer, its specifications, and additional features.

Operating an infrared thermometer is usually simple and does not require specialized courses. However, you should read the user manual before using the device.

Emissivity in infrared thermometers is a measure of a surface's ability to emit infrared radiation. It is a key parameter that affects the accuracy of temperature measurement with the device.

Emissivity can take values from 0 to 1:

- 0: An ideal mirror that reflects all radiation.

- 1: A perfect black body that absorbs all radiation incident upon it.

Most real surfaces have an emissivity between 0 and 1. For example:

- Metals: low emissivity (from 0.05 to 0.3).

- Non-metallic materials: high emissivity (from 0.8 to 0.95).

Infrared thermometers are calibrated to measure the surface temperature of an object with a specific emissivity. If the actual emissivity differs from the calibrated value, the temperature measurement will be incorrect:

- Lower emissivity: the infrared thermometer underestimates the temperature (detects less infrared radiation).

- Higher emissivity: the infrared thermometer overestimates the temperature (detects more infrared radiation).

There are several methods for correcting temperature measurement errors caused by emissivity:

- Infrared thermometer with adjustable emissivity: allows entering the emissivity value of the measured surfaces.

- Emissivity tables: contain emissivity values for various materials.

- High-emissivity paint: painting a surface with low emissivity improves measurement accuracy.

- Aluminum 0.05 - 0.10

- Copper 0.05 - 0.10

- Steel 0.20 - 0.35

- Cast iron 0.50 - 0.70

- Wood 0.80 - 0.90

- Paper 0.90 - 0.95

- Plastic 0.80 - 0.95

- Paint (black) 0.95 - 0.98

- Glass 0.80 - 0.90

- Concrete 0.80 - 0.90

- Brick 0.80 - 0.90

The emissivity values provided in the table are approximate. The actual emissivity may vary depending on the surface condition, temperature, and other factors. Exact emissivity values can be found in professional sources, such as ISO or ASTM standards.