< p > photosensitive resistance profile < / p > < p > photosensitive resistor is made using the photoelectric effect of the semiconductor a resistance change with the strength of the incident light and the resistor;
The incident light intensity, resistance is reduced, incident light is weak, resistance increased.
< / p > < p > photoresistor light measurement, the light is commonly used in control and photoelectric conversion (
The change of converts the change of light to electricity)
Commonly used photoresistor cadmium sulphide photosensitive resistor, it is made of semiconductor materials.
Photosensitive resistor resistance with the incoming light (
The strength of the change and change, in the dark, under the condition of its resistance (
The dark resistance)
Can reach 1 ~ 10 m euro, in bright light conditions (
It resistance (
Only a few hundred to thousands of ohm.
The sensitivity of the photoresistor light (
The spectral characteristics)
With the human eye to visible light (
4 to 0.
Mu m's response is very close, as long as the human eye can feel light, and will cause its resistance changes.
Electric circuit, the design USES incandescent bulbs (
Light or natural light for control the light source, has greatly simplified the design.
< / p > < p > photosensitive resistance structure < / p > < p > usually, photosensitive resistor are made into flake structure, in order to absorb more light.
When it was light irradiation, semiconductor chip (
Within just inspire electronic -
Hole pair, participate in conduction, increase current in the circuit.
In order to obtain high sensitivity, photosensitive resistance of electrode comb is often used to design, it is under a certain mask to photoconductive film on steamed gold-plated or indium metal forming.
< / p > < p > photosensitive resistor by photosensitive layer, the glass substrate (usually
Or resin moistureproof film)
And electrode, etc.
Photosensitive resistor in a circuit with the letter 'R' or 'RL', 'RG' said.
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< / p > < p > the article source: li 3 c electric light a night light ea -
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