Introduce the ABC of photosensitive resistor
[introduction] photosensitive resistor is to use vulcanization is lain between or selenium is changed lie between the special resistor that waits for semiconductor material to be made, its job principle is to be based on inside photoemission. Illumination heals strong, block value heals low, as illumination intensity elevatory, resistance is reduced quickly, bright resistance but small to 1KΩ the following. Photosensitive resistor is very sensitive to the light, its are in when having illumination, assume tall block position, dark resistance can amount to 1.5MΩ commonly. The special function of photosensitive resistor, the development as science and technology will get applied extremely extensively.
Photosensitive resistor is to use vulcanization is lain between or selenium is changed lie between the special resistor that waits for semiconductor material to be made, its job principle is to be based on inside photoemission. Illumination heals strong, block value heals low, as illumination intensity elevatory, resistance is reduced quickly, bright resistance but small to 1KΩ the following. Photosensitive resistor is very sensitive to the light, its are in when having illumination, assume tall block position, dark resistance can amount to 1.5MΩ commonly. The special function of photosensitive resistor, the development as science and technology will get applied extremely extensively.
One, photosensitive resistor
The making material with photosensitive commonly used resistor is vulcanization cadmium, still have the stuff such as lead of aluminium of selenium, vulcanization, vulcanization and vulcanization bismuth additionally. These material that make have the smooth illuminate in specific wavelengh to fall, its block is worth the character that reduces quickly. This is carry as a result of what illumination arises stream child participate in electric conduction, move in the action dirty drift of adscititious electric field, the electron runs quickly to the anode of power source, hole runs quickly to the negative pole of power source, make the block value of photosensitive resistor falls quickly thereby.
2, characteristic
Photosensitive resistor is very sensitive to the light. Illumination heals strong, block value heals low. As illumination intensity elevatory, resistance is reduced quickly, can reduce to 1KΩ the following.
3, working principle
The working principle of photosensitive resistor is to be based on inside photoemission, namely in semiconductor photosensitive material two end hold electrify pole lead, enclose its in the envelope that contains transparent window to form photosensitive resistor. To increase sensitivity, two electrode pectination of constant make it.
4, graph of photosensitive module principle
5, utility
1.Photosensitive resistor module is the most sensitive to environmental light intensity, use commonly detect the brightness of surroundings and light intensity.
2.Module is in the condition that do not have light or when threshold value of set of light intensity short of, DO mouth outputs tall n, when outside ambient light intensity exceeds set threshold value, module D0 outputs low n.
3.D0 of output of platelet number amount is OK with sheet piece chance is direct be linked together, through sheet piece machine will detect n of on any account, will detect from this light intensity change of the environment.
4.Platelet imitate quantity outputs AO to be able to be linked together with AD module, pass AD changeover, can achieve environmental light intensity more the numerical value with exact essence.