The so-called sensitive resistor refers to a resistor that is sensitive to various external factors such as temperature, humidity, pressure, and other factors. Because of the difference of various elements, there are many different classifications of sensitive resistors. Let me introduce some of them below. Common classification.
The thermistor is a kind of resistance whose resistance value is very sensitive to temperature. Such resistors are usually made of single crystal, polycrystalline, and other semiconductor materials. There are many kinds. For example, according to the temperature of the resistance, the resistance can be divided into a negative temperature coefficient thermistor whose resistance decreases with increasing temperature and a positive temperature coefficient thermistor whose resistance increases with increasing temperature.
For example, according to the magnitude and speed of resistance change with temperature; it can be divided into two types: slow change type and sudden change type. If divided according to the heating method of the resistor, it can be divided into two types: direct heating and indirect heating. According to its shape and structure, it can also be divided into a rod shape, disc shape, square shape, bead shape, linear tube shape, thin film and thick film thermistors. The main characteristics of thermistors are high sensitivity to temperature and low thermal inertia. , Long life, small size, and simple structure. It is widely used in the fields of temperature measurement, control, fire alarm, meteorological sounding, microwave and laser power measurement.
Photoresistance is a kind of resistive element based on the principle of the semiconductor light effect. Its resistance changes by shifting the intensity of incident light. Photoresistors are usually composed of glass substrates, photosensitive layers, electrodes and so on. It can be divided into polycrystalline photoresistors and single-crystal photoresistors. According to the spectral resolution of photoresistors, they can be further divided into ultraviolet photoresistors, visible light photoresistors and infrared photoresistors. Used in various photoelectric automatic control systems, mainly photoresistors such as selenium, cadmium sulfide, cadmium selenide, zinc sulfide, etc., are usually used in various photoelectric automatic control systems.
Varistor is a sensitive resistor. When a certain voltage is separated, its resistance value will drop sharply. According to the different materials, it can be divided into silicon carbide varistor, silicon varistor and metal oxide. Material varistor and barium titanate varistor, etc. According to its structure, it can be divided into bulk varistor, junction varistor, single-particle laminated varistor and thin-film varistor. According to its volt-ampere characteristics, it can be divided into symmetrical resistance-sensitive resistance and asymmetrical varistor. Its performance parameters are nominal voltage, nominal current, nonlinear coefficient, current capacity and voltage temperature coefficient, etc. Varistors are mainly used in overvoltage protection and voltage stabilization circuits.
4. Magnetic resistance.
Magnetron resistance is also called magnetron resistance. It is made using the magnetoresistance effect. Its distinguishing feature is: in a weak magnetic field, the relationship between the resistance value and the magnetic field increases the magnetoresistance according to the square law with high sensitivity, but the direction of the magnetic field cannot be judged, and it is greatly affected by temperature and the resistance of the magnetoresistance Changes with the change of the magnetic field. The manufacture of non-contact switches has made great achievements in measurement technology, automatic control, and signal processing.
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