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The basic characteristics of the photocell were tested and analysed through experiments by an optical control experimental platform, such as short circuit current, open circuit voltage, illumination characteristic, volt ampere characteristic, load characteristic, and spectral characteristic.
Using photocell experimental apparatus for data collection and analysis, then handling data by software, you can analyse characteristics of photocell; test results are consistent with the theory. After knowing the characteristics of the photocell, we can build an optical control circuit using photocell.
3.1. Work Principle and Basic Characteristics of Photocell Photodetectors, also called photosensors, are sensors of light or other electromagnetic radiation which are widely used in the digital camera, optical communication, solar cells and other fields, the photocell is a basic unit of semiconductor photoelectric detector.
Volt ampere characteristics When the input light intensity of silicon photocell is constant, the relationship between the output voltage and current of the photocell along with the change of load resistance is called the volt ampere characteristic. Load characteristics The photocell is used as a battery, as shown in figure 3.
The basic characteristics of silicon photovoltaic cells are mainly studied, such as short-circuit current, photoelectric characteristics, spectral characteristics, volt ampere characteristics, time response characteristics and so on, and the application of silicon photocell can be realised.
3.3.2. Open Circuit Voltage Characteristic Test of Silicon Photocell. Under the condition of the Fig2 circuit, the illuminance on photocell is controlled by illumination meter. Adjust illumination to the minimum, connected to the illumination meter, DC power to the minimum, open the illumination meter, at this time the meter readings should be 0.
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