The working principle of the photosensitive resistance

1. < em > photoresistor < / em > works - Introduction < p > photosensitive resistance, is a special kind of resistance, referred to as 'light resistance, also known as light pipe, which makes use of the photoconductive semiconductor effect made a resistance change with the strength of the incident light and the resistor, also known as photoconductive detector. It's a direct relationship between the resistance and the strength of the light, the light intensity increases, the resistance decreased; Light intensity decreases, and the resistance increased. This is due to the light produced by the carrier are involved in the electric conduction, in the role of the applied electric field low drift motion, electronic toward the positive, of the power supply hole towards the power of the cathode, thus make photosensitive resistor resistance drops rapidly. < / p > 2。 Working principle of the < em > photoresistor < / em > < p > photosensitive resistance within the working principle is based on the photoelectric effect. When there is a certain wavelengths of light of photosensitive resistance, its resistance ( Bright resistance), Decreased dramatically, the circuit of current increase rapidly. Generally want dark resistance, the better, the greater the resistance as small as possible, high sensitivity of photosensitive resistance at this time. Actual photosensitive resistance level of dark resistance in ohms, light resistance under thousands of Europe. < / p > < p > it is coated in a thin layer on the glass base semiconductor material, equipped with metal electrodes on both ends of the semiconductor, metal electrode connected to the at inlets, photosensitive resistance through the extension line terminal access circuit. In order to prevent the influence of the surrounding medium, in the semiconductor photosensitive layer is covered with a layer of film, film composition should make it in the photosensitive layer of the most sensitive wavelength range transmittance is the largest. < / p > < p > in the darkness of the environment, its value is very high; When the photosensitive resistance by illumination and optical radiation energy is large enough, the electrons in the valence band absorption after the photon energy transition to the conduction band, become free electrons, causes cavitation at the same time, the electron - The appearance of the hole of resistivity decreases. The more light is strong, light raw electronic - Hole for the more, the more resistance is low. When photosensitive resistance and voltage of current through the photoresistor light increases. Incident light disappeared, electron - Holes of composite gradually, resistance also gradually restore original value, current also gradually reduced. < / p > 3。 Working principle of the < em > photoresistor < / em > -- - Application < p > photoresistance semiconductor photosensitive device, in addition to high sensitivity, fast response, spectral characteristics and r value consistency is good wait for a characteristic, in the high temperature, high humidity under the bad environment, still can maintain a high level of stability and reliability, can be widely used in camera, solar garden lamp, lawn lamp, counterfeit detector, quartz clock, music cup, gift boxes, mini night light, GuangShengKong switch, street lamp automatic switch and all kinds of electric toys, electric lighting, lamps and lanterns, and other areas of the automatic light switch control. < / p > < p > chaozhou li electrical appliance factory specializing in the production of light a night light, temperature and humidity meter, LED rechargeable small desk lamp. < / p > article source: li 3 c electric light a night light ea - gl。 com/

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