[PConline Information] Recently, due to the severe epidemic, everyone has not only been subject to many restrictions on going out, but even if they can go out, they must also accept body temperature measurement everywhere, which is very inconvenient. At present, the most commonly used thermometer in public is the temperature gun, which only needs to stop the person to “tick” to the forehead or wrist to get the temperature. However, many people find that many thermometers will also measure the temperature of their wrists after measuring the temperature of their foreheads, which makes people wonder: Where is the temperature gun more accurate?
The temperature measurement principle of the physical temperature gun is to quickly detect the temperature of the corresponding position according to the received infrared energy. Almost all objects emit infrared rays, and the amount of energy it contains is directly related to the temperature of the object, of course, the forehead and wrist are no exception, so the body temperature gun that does not need to be in contact with the person tested has become the best temperature measuring instrument in public places.
Although the thermometer can avoid cross-infection, its shortcomings are also obvious. The measured value of the thermometer is easily affected by external factors, such as when you are in a cold and windy day in the north, the value obtained when measuring the temperature outdoors may be low. And the skin on the forehead is always exposed, and the temperature will not be a fixed value. After you run 5 kilometers, the temperature measured with the thermometer may be high, coupled with the presence of hair, sweat, grease and dirt, they will have an impact on the measurement to varying degrees, resulting in a certain error.
To reduce the error, we can take the average or compare it with the temperature measured by a mercury thermometer. First make sure your temperature is within the normal range, then measure your temperature with a thermometer and write down the reading, then measure the temperature of the other person in the same part, if his temperature is higher than yours, it means that the person needs to be further examined. As for the forehead, we can let the test subject adapt to the temperature measurement environment for a few minutes before measuring or measure the abdomen, chest, shoulder blades and other parts with more stable temperature as recommended by the manufacturer. However, it is not realistic to repeatedly measure the temperature and pull clothes in public, so it can be seen that measuring the wrist temperature has become a compromise choice.
At a press conference on the State Council’s joint prevention and control mechanism on February 16, Feng Luzhao, a researcher at the Chinese Center for Disease Control and Prevention, said it would be more accurate to measure the temperature of people entering from outside through a thermometer, or when measuring outdoors, to measure the temperature of areas covered by clothing, such as wrists or necks. This is not only because clothes have a thermal insulation effect, when you are awake, the temperature change of the wrist is only about 1 ° C, which is not much compared to the forehead exposed in the external environment. So, measuring wrist temperature is indeed a compromise method.
Seeing this, I believe that many friends will have such doubts, there are many troubles in the use of the temperature gun, why can’t you measure the temperature in another way? Although the mercury thermometer or electronic thermometer commonly used in the home is highly accurate, each measurement takes at least 10 minutes, which takes hundreds of times more than the temperature gun, and it needs to be in contact with the human body when measuring, and it needs to be cleaned and disinfected after each use, which will greatly increase the workload of the staff. If there is an unexpected situation such as breaking the thermometer during use, it is necessary to carefully clean the glass slag and mercury (i.e. mercury) that is harmful to the human body, which can be a lot of trouble.
There is also a commonly used thermometer called an ear thermometer, which is also highly accurate, but it needs to be inserted into the ear piercing to measure the temperature of the eardrum. This method also has physical contact problems, and although disposable protective covers can be put on the probe, it still has considerable costs for high-traffic public places.
In summary, temperature guns are a cost-effective choice when we face infectious diseases and a large number of susceptible people. In fact, during the SARS virus in 2003, 17 years ago, and during the Ebola epidemic that ravaged West Africa in previous years, infrared thermometers, including temperature guns, played a considerable role in public epidemic prevention. Therefore, in the face of this epidemic, they will naturally go out again in order to contribute to the epidemic prevention work again.
However, it should be noted that although the temperature gun can only let us know our approximate temperature when we go out, it is best to use a mercury thermometer or electronic thermometer to obtain more accurate results, and if the body temperature is higher than normal, you need to go to the hospital fever clinic in time. However, even if your body temperature is within the normal range, do not take it lightly, because fever is not a symptom that patients with new crown pneumonia or other infectious diseases will inevitably have, so we still need to wash our hands frequently, ventilate frequently and do corresponding disinfection measures in daily life to reduce the chance of infection of ourselves and our families as much as possible.