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The change of the temperature on the influence of the resistor?
日期:2011年6月17日 瀏覽[2848]

The change of the temperature on the influence of the resistor?
Resistors and other semiconductor devices, as well as by the temperature on the bigger, when the temperature rises, its dark resistance will decline. The change of the temperature of spectral characteristics also have very big effect. Figure 2.6.6 is "the spectrum of photoconductive resistance temperature characteristic curve. As can be seen from the graph, it with the temperature rising to the peak value of shorter wavelengths in the direction of movement. So, sometimes in order to improve the sensitivity, or in order to accept the far infrared light and cool things down.
Commonly used photosensitive resistors are cadmium sulphide photosensitive resistors, it is by the semiconductor material is made. Photosensitive resistor with resistance of the incident ray (visible) the strength of the changes in the dark conditions, its resistance (dark resistance) up to 1 ~ 10 M Ω; When light conditions (100 LX), it resistance (light resistance) only several hundred to thousands of ohms. Photosensitive resistor (that is, the sensitivity of the light spectrum) and eye to visible (0.4 ~ 0.76) u of m's response is very close, as long as the human eye can feel light, can cause its resistance changes. So a circuit, control design with the incandescent light bulb (small DianZhu) light or natural light as control the light source, make a design greatly simplified.
Photoconductive resistance with the wavelength is the strength of the light corresponding resistance changes not linear, also cannot use it as a photoelectric linear transformation, this is the place where users should pay attention to. Beginners can purchase a photosensitive resistor (MG45 type), in a single night some 60 ~ 100 W bulb, using a multimeter to direct measurement of photosensitive resistance of the resistor. Measurement, should put photoconductive resistance to incandescent lamp light, and then gradually open and distance (light by nearly to the far), observe the multimeter instructions resistance changes, can verify photoconductive resistance, intuitive, with the purpose of it: the perceptual knowledge.
Commonly used photosensitive resistors model have sealed type, the MG41 MG42 MG43 and the sealed type, the MG45 (price cheap). They are both in the power rating of 200 mW below.
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