Recent Examples of photodiode from the Web
Star gazing 1922: Professor Joel Stebbins attaches what is called a photodiode to the Washburn Observatory’s 15-inch telescope to measure and track stars.
The lasers have slightly different pulse repetition frequencies, so over time, the output of the photodiode oscillates from producing two signals to producing four and back again.
The simplest part of the system is probably the laser measurement system, which only requires a laser with very high polarization purity and five photodiodes, all mounted on a very, very stable table.
For solar power, the device uses a tiny (1 cm square) photodiode.
Supplemental power to increase the device’s range comes from photodiodes, essentially tiny solar panels.
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