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Photodetectors or photosensors are sensors that are used to transform incoming optical energy into electrical signals. A photodetector used in the application field of color science and technology typically covers the visible spectrum wavelength range from 380 to 780 nm.
Photodetectors are transducers that transform one of their characteristics when light energy impinges on them. In this category, photoresistors alter their ohmic resistance, rods, and cones of the retina neurons of the eye alter their electrochemical response, and chlorophyll in plant leaves changes the rate of converting CO2 to O2. Some other photodetectors alter the flow of electrical current or the potential difference across their terminals.
Photodetectors with sufficiently fast response that provide a measurable output for a small amount of light are easily reproducible and are economical and worth investigating for applications in high-speed optical...
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