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laser_transceiver [2014/11/11 15:24] cwh0009 [Photos] |
laser_transceiver [2014/11/11 15:34] cwh0009 [Experiments/Demonstrations] |
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====== Overview ====== | ====== Overview ====== | ||
- | The laser transceiver is a free space optical communication device that encodes audio on a laser beam using pulse width modulation (PWM). A single transmitter and receiver unit can be built for about $15-$20 in parts. We used to use this for a demonstration in ELEC 3030 (RF Systems Lab), but aligning the lasers took quite a bit of time to setup. | + | {{:transmitter_1.jpg?direct&200 |}}The laser transceiver is a free space optical communication device that encodes audio on a laser beam using pulse width modulation (PWM). A single transmitter and receiver unit can be built for about $15-$20 in parts. We used to use this for a demonstration in ELEC 3030 (RF Systems Lab), but aligning the lasers took quite a bit of time to setup. |
====== Design ======= | ====== Design ======= | ||
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{{:transmitter_5.jpg?direct&400|}} {{:transmitter_3.jpg?direct&400|}} | {{:transmitter_5.jpg?direct&400|}} {{:transmitter_3.jpg?direct&400|}} | ||
====== Experiments/Demonstrations ====== | ====== Experiments/Demonstrations ====== | ||
+ | * Place a fan in between the transmitter and receiver, breaking the laser. The fan will generate a tone as it spins. | ||
+ | * Use the receiver to listen to light and see if anything else generates sound. Fluorescent lights should. | ||
+ | * Shake power or dust through the laser, or transmit through a stream of water. It should interrupt the audio. |