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2022

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09

Will the resistor be affected by the change of temperature?

Category:


【Summary】Like other semiconductor devices, resistors are greatly affected by temperature. When the temperature rises, its dark resistance will drop. The change of temperature also has a great influence on the spectral characteristics. Figure 2.6.6 is the spectral temperature characteristic curve of lead sulfide photosensitive resistor.

Like other semiconductor devices, resistors are greatly affected by temperature. When the temperature rises, its dark resistance will drop. The change of temperature also has a great influence on the spectral characteristics. Figure 2.6.6 is the spectral temperature characteristic curve of lead sulfide photosensitive resistor. It can be seen from the figure that its peak value moves in the direction of wave length with the rise of temperature. Therefore, sometimes cooling measures are taken to improve sensitivity or to accept far infrared light.


The common photosensitive resistor is cadmium sulfide photosensitive resistor, which is made of semiconductor material. The resistance of photosensitive resistor varies with the intensity of incident light (visible light). Under dark conditions, its resistance (dark resistance) can reach 1~10M Ω; Under strong light conditions (100LX), its resistance (bright resistance) is only hundreds to thousands of ohms. Sensitivity of photosensitive resistor to light (i.e. spectral characteristics) and human eye to visible light (0.4~0.76) μ The response of m is very close. As long as the light can be felt by the human eye, it will cause its resistance to change. So when designing the light control circuit, the incandescent bulb (small electric bead) light or natural light is used as the control light source, which greatly simplifies the design.


The change of the corresponding resistance value of the photosensitive resistor with the intensity of the incident light is not linear, so it cannot be used for the linear transformation of photoelectricity. This is the point that users should pay attention to. Beginners can purchase a photosensitive resistor (MG45 type), light a 60-100W incandescent lamp at night, and measure the resistance of the photosensitive resistor directly with a multimeter. During the measurement, the photosensitive resistor should be pointed at the light of the incandescent lamp, and then gradually open the distance from the lamp (from near to far), observe the change of resistance value indicated by the multimeter, which can directly verify the characteristics of the photosensitive resistor, so as to deepen the perceptual understanding of it.


The commonly used photosensitive resistor models include sealed MG41, MG42, MG43 and unsealed MG45 (cheap). Their rated power is below 200MW.


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