Time：2022-08-24 Author：
From a general perspective, it can be divided into two types:
1. Contact temperature sensor
As the name suggests, the contact temperature sensor is a temperature sensor that can directly contact the measured object. The detection part of the contact temperature sensor has a good contact with the measured object, also known as a thermometer. The thermometer achieves thermal equilibrium through conduction or convection, so that the indication value of the thermometer can directly represent the temperature of the measured object. Generally, the measurement accuracy is high. In a certain temperature measurement range, the thermometer can also measure the temperature distribution inside the object. However, for moving objects, small targets or objects with small heat capacity, large measurement errors will occur. Commonly used thermometers include bimetal thermometers, liquid-in-glass thermometers, pressure thermometers, resistance thermometers, thermistors and thermocouples. They are widely used in industry, agriculture, commerce, etc.
2. Non-contact temperature sensor
The non-contact temperature sensor does not need to be in contact with the measured medium, but reaches the temperature sensor through the thermal radiation or convection of the measured medium to achieve the purpose of temperature measurement. Its sensitive element and the measured object do not contact each other, also known as non-contact temperature measuring instrument. This instrument can be used to measure the surface temperature of moving objects, small targets and objects with small heat capacity or rapid temperature changes (transient), and can also be used to measure the temperature of temperature fields.
The non-contact infrared thermometer is mainly introduced here. It is used to measure the body temperature of influenza patients. This kind of thermometer is convenient and simple. In order to avoid infection, non-contact infrared thermometers must be used when measuring influenza patients. Skin contact, quick measurement, is a must-have thermometer for checking flu patients. Now during the epidemic period, a non-contact thermometer is needed to measure.
Application of non-contact infrared thermometer:
This kind of thermometer has a wide range of uses and can measure the temperature of the human body, which is accurate and fast, and is more convenient than a mercury thermometer; to measure the temperature of human skin, it is generally used in the replantation of amputated limbs. Infrared thermometer; can also be used to measure the temperature of the watch body, like a cup; it is also very good to measure the temperature of liquids with a non-contact infrared thermometer, such as measuring the temperature of bath water, it is very convenient to use this thermometer to measure.
Precautions for non-contact infrared thermometers:
When measuring the body temperature, measure the forehead of the human body. Be careful not to cover the forehead with hair, so as not to affect the temperature measurement. The distance between the instrument and the forehead should be about 8 cm; if the person to be measured comes from a place with large environmental differences, it needs to wait for about 5 minutes before proceeding. Measurement; the person who measures the temperature must be in a stable environment, not at the blower outlet of fans, air conditioners, etc.
Features of non-contact infrared thermometers
This type of sensor mainly includes infrared temperature sensor. The main feature of this temperature measurement method is that it can measure the temperature of materials in motion and objects with small heat capacity (such as the temperature distribution in integrated circuits). The forehead is an ideal location for taking temperature readings because it is crossed by the temporal artery and receives flowing blood from the aorta and carotid arteries. Furthermore, the forehead is the only part of the head that is in direct contact with the brain and not covered by hair. The brain is the most important, delicate and most fragile organ of the human body. The body has a fever, the temperature rises and falls, and the head feels it first. A non-contact thermometer is a modern and safe body temperature measurement device. Non-contact thermometers do not touch the skin, and non-contact infrared thermometers do not need to be placed anywhere on your child's body. Just hold it close to your forehead and keep it at a certain distance, and the thermometer itself can display the temperature.
Dutch scientist Daniel Wallenheit has studied the properties of thermal expansion and contraction. When the temperature is different, the volume is different. Using this property, the temperature can be measured. In principle, a thermometer can be made of any substance that can change its properties depending on the temperature. Therefore, parents should consider carefully when choosing a thermometer for their children, because some thermometers have unsafe factors. For example, mercury thermometers, although they are more common and cheaper, are made of glass, which is fragile, and the exposure of mercury will pollute the surrounding air and cause harm to the human body. Therefore, parents try not to use mercury thermometers. The most common large-scale temperature measurement thermometer is a non-contact infrared thermometer. Here I recommend a non-contact infrared thermometer CK-T1502 fromShenzhen Fitconn Technology. The accuracy of this thermometer is ±0.2°C, and there are two modes that can be adjusted, it is convenient and fast to use, and the most important thing is high precision, which is very suitable for purchase.
