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--- laser_transceiver [2014/11/11 15:24]
cwh0009 [Photos]
+++ laser_transceiver [2014/11/11 15:34]
cwh0009 [Experiments/Demonstrations]
@@ Line 1: / Line 1: @@
 ====== 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 =======
@@ Line 49: / Line 49: @@
 {{:transmitter_5.jpg?direct&400|}} {{:transmitter_3.jpg?direct&400|}}
 ====== 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.

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