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I aim to find out how distance affects the light intensity emitted from an LED.
Member rating: No Rating | Words: | Submitted: Mon Feb 02 2004
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Aim I aim to find out how distance affects the light intensity emitted from an LED. Introduction To do this I will have to use a sensor of some description. There are a few different components that are currently available to sense for light, these are an LDR (light dependent resistor), a photodiode, a photo voltaic cell or a photo transistor. The LDR as its name suggests is a resistor that is affected by light. The darker it is the higher the resistance and obviously the more light the lower the resistance. A photodiode is a p-n diode with a window that allows the p-n junction to be exposed to light. "The diode is reverse-biased. Incident light creates charge carriers in the junction region enabling current to pass through the p-n junction." A photovoltaic cell is a cell designed to generate an electromotive force when light shines on it. A photovoltaic cell, sometimes referred to...
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