The difference between mercury thermometer and infrared thermometer

First of all, the principle is different

1, mercury thermometer: a thermometer made of glass, the mercury column rises with the body temperature.

2. Infrared thermometer: It is a thermometer that uses radiation principle to measure body temperature. The infrared sensor it uses only absorbs the infrared rays radiated by the human body, does not emit any rays to the outside world, and senses the body temperature in a non-contact way.

Second, the characteristics are different.

1. Mercury thermometer: Mercury is stored in the mercury ball at the end. When mercury is heated, it will expand and rise along a narrow glass tube. Therefore, small changes in body temperature will lead to a large increase in mercury in glass tubes. After taking your temperature, you have to shake the thermometer vigorously to make the mercury return to the mercury ball.

2. Infrared thermometer: The advantage of infrared thermometer is that it is convenient, simple, fast and quite accurate to collect body temperature, which is very suitable for acute and severe patients, the elderly, infants and so on. The disadvantage is that it is easily affected by ambient temperature, in which case the error is large.

Extended data:

Matters needing attention in the use of infrared thermometer;

1. Use an ear thermometer. Do not use it for patients with ear diseases such as otitis externa and otitis media.

2. Don't use an ear thermometer when the ear hole is wet after swimming and bathing.

3. When the measured person comes from a place with a large difference from the ambient temperature, he should stay in the measuring environment for at least 5 minutes, and then measure it after it is consistent with the ambient temperature.

4. After patients with fever sweat on their foreheads, cold compress and other cooling measures are adopted, and the measurement results will be low. In this case, temperature measurement should be avoided.

Baidu encyclopedia-mercury thermometer

Baidu encyclopedia-infrared thermometer