We first understand the electronic thermometer temperature measurement principle.
Infrared forehead temperature gun technology principle:
Any object will release infrared radiation energy, its surface temperature determines the size and wavelength of the radiation energy, based on this principle. Based on this principle, the forehead temperature gun is equipped with a high-precision infrared sensor to measure the wavelength of infrared radiation energy released by the human body of 5-14μm, and through the precise calculation and compensation correction, the measurement of the human body temperature.
Infrared body temperature detector (forehead temperature gun, ear temperature gun, etc.): through the measurement of forehead or measurement of the ear tympanic membrane radiation temperature, to achieve the measurement of human body temperature.
Compared with the traditional mercury glass thermometer, the electronic thermometer has a convenient reading, short measurement time, relative hygiene, can remember, with voice prompts, electronic thermometer does not contain mercury, high security, suitable for families with babies, hospital patients and other uses.
This year's epidemic, so that more people use the electronic thermometer. In the process of our use, people often find that the electronic thermometer every time the number of measurements are not the same, some are even worse. This has led to confusion and distrust of electronic thermometers.
In fact, there are several reasons for this.
1, First of all, we have to be clear about one thing is that the forehead temperature gun has errors in most scenarios. Frontal temperature guns differ from the actual temperature in terms of temperature measurement accuracy and stability. This depends mainly on the accuracy of the sensor used by the manufacturer. The quality of domestic brands varies, while foreign brands have slightly smaller deviations.
Comparison of performance indicators of temperature sensors for electronic thermometers
2, the amount of temperature gun, the error is affected by the environment, temperature, while it has a working temperature range.
Maximum Allowable Error: China's error is ± 0.3 ℃. Measuring range: 35--42 degrees
Operating environment: temperature 16-35 ℃, humidity ≤ 85%
Too hot and too cold is not good. Therefore, we often see in the epidemic news, the forehead temperature gun in the low temperature does not work, to be placed in the coat pocket to cover the heat and some to work properly.
3, the forehead temperature gun by different temperatures, environment, will affect the measurement results. Therefore, our temperature measurement method is also very important.
The temperature measurement method: the forehead temperature gun pointing to the center of the forehead, above the eyebrow and keep vertical, the measurement site can not have hair cover, can not have sweat. The infrared head is 1-3 centimeters away from the forehead skin, not too far away, and can not touch the skin. Holding should be stable, the hand should not shake, vertical to the forehead. Temperature measurement time is best to continue for a short period of time, 2 seconds later, the display has a temperature digital display, and then take the forehead temperature gun away from the forehead.
Note: The subject should be kept in a stable environment for at least 5 minutes. 30 minutes without strenuous exercise, sunbathing, going in and out of an air-conditioned room, blowing a fan, or taking a shower. You can rest for a while and then measure the temperature. If you have a baby at home, pay attention to temperature changes after feeding, crying, wearing too many clothes, in an air-conditioned house, or under a blanket. It is recommended that you take three measurements and choose the highest temperature.
If the temperature measurement error is too large, there are babies at home, you can use the electronic thermometer as a temperature screening, if the electronic thermometer first measured the temperature is abnormal, and then use the mercury thermometer to confirm. At the time of the epidemic, some of our prevention and control points are doing this, electronic thermometer if the temperature measured abnormal, must be reconfirmed with a mercury thermometer.
Of course, some forehead thermometers are still accurate. Our family, especially with children baby, in the preparation of the forehead temperature gun, also prepare a mercury thermometer, at any time for the two thermometer temperature error comparison, to maintain the accuracy of the forehead temperature gun. If the error is too large, you should change it, so that you don't miss your baby's health.
Difference between forehead and ear thermometers
Both forehead and ear thermometers utilize the infrared temperature measurement principle. As our forehead is exposed, it is easily affected by the ambient temperature, which leads to many inaccurate results. The ear thermometer measures the temperature of the tympanic membrane, which is located in the deepest part of the external auditory canal and is not easily affected by the external environment, so the results more accurately reflect our body temperature. Therefore, ear thermometers are more accurate.
However, it's important to note that ear thermometers are in direct contact with the ear, and there is a risk of infection. In addition, it is not easy to master the method of temperature measurement, as the ear thermometer has to penetrate deep into the ear canal, which may not be easy for children to cooperate with.
Special reminder - electronic thermometers have a life expectancy, usually five years. Electronic thermometer is a medical device, should have a medical device approval number. When buying, pay attention to identify. Your situation belongs to the electronic thermometer does not fall zero, to say the reason for this situation, your thermometer is bad, not allowed, need to take the calibration or need to replace the new thermometer, that is, this situation.