Human body temperature measuring instrument popular science knowledge
glass thermometer
Measuring principle and method of use: The glass thermometer is cheap, and has high measurement accuracy and good stability. It is mainly measured through the thermal expansion and contraction characteristics of mercury. Before use, shake the temperature of the glass thermometer to below 35°C, clamp it under the armpit, measure for about 5 minutes, take it out and read it against the scale. It should be noted that although the glass thermometer has high accuracy, it takes a long time to read, and the main component is mercury, which may cause leakage due to improper use. Therefore, it is not recommended to use it to measure the body temperature of children.
Medical Electronic Thermometer
Measuring principle and method of use: The medical electronic thermometer is composed of a temperature sensor, an application-specific integrated circuit, a liquid crystal display and other electronic components. When measuring, the body temperature is displayed in digital form. Compared with glass thermometers, medical electronic thermometers are convenient to read, have a short measurement time, do not contain mercury, and will not cause harm to the human body and the surrounding environment. Before use, press the switch for about 2 seconds, wait for the buzzer to sound, the display will display the last measured temperature, and continue for about 2 seconds, the "℃" symbol on the display will start to flash, then display Lo ℃, start to enter In the temperature measurement state, you can put the electronic thermometer under your armpit for about 60 seconds. When the thermometer beeps for about 5 seconds, it means that the thermometer has finished measuring and you can read the temperature value.
Infrared forehead thermometer
Measuring principle and method of use: Infrared forehead thermometer is an instrument that uses infrared radiation exchange between skin and detector and appropriate emissivity correction to measure skin temperature. Infrared forehead thermometers generally do not exceed a deviation of 0.3°C. When turning on the machine, adjust the temperature measurement mode to "body temperature"; point the infrared detector part to the center of the forehead and keep it vertical. It is recommended that the distance from the forehead be (3cm ~ 5cm), (the measurement distance can also be based on the manufacturer's instructions), measure The part should not be covered by hair, and if there is sweat, it should be wiped dry; press the temperature measurement button and hold it for no less than one second, and the temperature will be displayed on the screen. the
infrared ear thermometer
Measuring principle and method of use: Infrared ear thermometer is a temperature measuring instrument that uses the heat radiation exchange between the ear canal and tympanic membrane and the detector to measure the temperature of the human body. The deviation of infrared ear thermometers generally does not exceed 0.2°C. In order to ensure accurate measurement and avoid cross-infection, the protective cover should be replaced before measurement; after power on, gently pull the pinna to straighten the ear canal, insert the sensor into the ear hole and align it with the eardrum, press and hold the temperature measurement button for one second, Release the button after hearing a long "beep" sound, and the measurement is completed, and the temperature will be displayed on the screen. After the ear thermometer is used, the protective case should be discarded and not reused.
Infrared Screening Instrument
During this epidemic, infrared screening devices were installed in crowded public places such as airports, stations, docks, etc. An instrument that warns when the preset warning temperature value is reached or exceeded. Generally no more than 0.4°C deviation. It should be noted that, in order to ensure accurate measurement, it is recommended that each unit be verified or calibrated by a metrological technical institution before using the temperature measuring equipment. For newly purchased infrared thermometers, or when they are used frequently and have doubts about the measurement results, the infrared thermometer should be calibrated to determine its correction value and eliminate the error of the infrared thermometer as much as possible. When the person under test is waiting for temperature measurement in the car, it is recommended that the people in the car turn off the heating and open the windows 5 minutes in advance, so that the temperature of the human body and the external environment can be kept in thermal equilibrium before taking the measurement. If the person under test suffers from shortness of breath due to long-term wearing of a mask that is too tight, and the face is red and swollen, there will be some errors in the measurement data at this time, and the test will be performed after a little calm down.
