[Popular Science Detailed At present species (three) sensors
sensor is an essential product of the information age, almost everywhere. It is the key to human access to information from the outside world. Now people rely on their sense organs, in the study of natural phenomena and laws as well as production activities in their function is far enough.
Then [science] Detailed species present (b) of the sensor article writing.
1 ,. temperature sensor means able to feel the temperature sensor and converted into a usable output signal. The temperature sensor is a core part of the temperature measuring devices, a wide variety. Press measurement can be divided into contact and non-contact two categories, classified into two types according to the heat resistance and thermocouple sensor materials and electronic components characteristics.
2, the detection contact portion with the measured object contact type temperature sensor in good contact, known as a thermometer. Thermometer by conduction or convection thermal equilibrium, so that the indication indicates the temperature of the thermometer can be directly measured object. Usually higher precision measurement. A porous high silica glass sintering carburizing carburizing heat resistance glass is a low temperature thermometer, temperature sensing element, may be used to measure temperature in the range of 1.6 ~ 300K.
Non-contact sensing elements which do not contact with the measured object, also known as non-contact Thermometer. This type of meter used to measure the moving object, a small thermal capacity and small targets or rapid temperature variations (transients) of the object surface temperature, the temperature field can also be used to measure the distribution. The most commonly used non-contact thermometer table based on the basic law of black body radiation, referred to as a radiation temperature meter. Radiation thermometry method comprising luminance (see optical pyrometer), radiation (see Radiation pyrometer) and colorimetry (see colorimetric thermometer). Non-contact temperature measurement advantages: from measurement limit temperature sensing element limits the degree of temperature, and therefore there is no limit on the maximum temperature can be measured principle. For high temperature of 1800 ℃, mainly non-contact method of temperature measurement. With the development of infrared technology, infrared radiation thermometry gradually expanded from a visible light, at room temperature until 700 ℃ the following are employed, and high resolution.
