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Alvin
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Help! is a photo detector the same as photosensor? can they be specifically for infrared light? and what does point source mean?
Alvin said:so does point sourc light spread out? so that the intensity is inversly proportional to the square of the distance from source?
A photodetector is a device that converts light signals into electrical signals, while a photosensor is a device that detects the presence of light. In simpler terms, a photodetector measures the amount of light, while a photosensor simply detects the presence or absence of light.
Both photodetectors and photosensors use specialized materials, such as semiconductors, that are sensitive to infrared light. When infrared light hits these materials, it causes a change in their electrical properties, which can then be measured or detected by the device.
A point source of light is a single, concentrated source of light, such as a laser beam or a candle flame. A non-point source of light is a broader source of light, such as a light bulb or the sun. Photodetectors and photosensors can be designed to detect either type of light source, but may have different sensitivities and capabilities for each.
Yes, photodetectors and photosensors can be designed to detect a wide range of wavelengths, including visible light and ultraviolet light. The specific materials and technologies used in the device will determine its sensitivity and range of detection.
Photodetectors and photosensors have a wide range of applications, including in photography, security systems, medical imaging, and optical communication. They are also commonly used in electronic devices, such as smartphones and remote controls, to detect light and adjust screen brightness or activate functions.