Infrared thermometers measure body temperature through infrared rays, which can be divided into two types: contact type and non-contact type. Infrared thermometers are relatively safe and accurate for temperature measurement, suitable for the elderly, children, hospitals and families.
How does an infrared thermometer work?
Let's first look at Infrared Rays:
Infrared rays are electromagnetic waves with wavelengths between microwaves and visible light, which are invisible to the naked eye. Any object above the absolute temperature (-273°C) will continuously emit infrared radiation energy to the surrounding space, which is called heat rays in physics.
The size of its infrared radiation energy and its wavelength distribution are closely related to the surface temperature, so the surface temperature of the object can be accurately measured by measuring the infrared energy radiated by the object.
The temperature of the human body is also related to the amount of infrared radiation energy emitted by the human body. The infrared thermometer can convert the radiation energy of the infrared rays emitted by the human body into electrical signals, and obtain the temperature value of the human body by measuring the magnitude of the electrical signals. This is the theoretical basis of infrared thermometers.
The advantages and disadvantages of infrared thermometer:
When measuring the temperature of the forehead, the infrared thermometer should be aimed at the forehead and the distance should be relatively close, about 3-5 mm, and the measurement time can get the result within a few seconds.
The advantage of infrared thermometer is that it is convenient, simple and fast to collect body temperature. It is more hygienic to use than mercury thermometer, and it is quite accurate. It is very suitable for acutely ill patients, the elderly, infants and other use.
The disadvantage is that it is easily affected by the ambient temperature, and the error is large in this case. The measurement results may be affected by the ambient temperature. For example, in an extremely cold environment, a temperature below 10°C, or a very high temperature environment, the temperature measured by the infrared thermometer may be inaccurate.
