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project:laser_modulation [2015/12/16 20:44] ivan_ahepjuk [Transmitting sound frequencies by using the modulated laser beam] |
project:laser_modulation [2015/12/23 19:13] (current) ivan_ahepjuk [Main solution:] |
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| **2]** It would be pain in the ass to calibrate this and it would change with "each blow of the wind". There are better way and they are called modulation. | **2]** It would be pain in the ass to calibrate this and it would change with "each blow of the wind". There are better way and they are called modulation. | ||
| - | * **Pulse-Frequency Modulation**: The main idea is to make laser flashing at the frequency, which I am actually transmitting. In the other words, instead of transmitting sinus of the frequency X, I can transmitt pulse signal of the frequency X and then, after receiving this pulse signal of the frequency X, just make the sinus from it by analog filters. | + | * **Pulse-Width Modulation**: The main idea is to make laser flashing at certain frequency and while transmitting, be changing the width of pulses by the transmitted frequency |
| + | * https://en.wikipedia.org/wiki/Pulse-width_modulation. | ||
| **Step 1:** Initial design: This is basic idea how to build the transmitter. | **Step 1:** Initial design: This is basic idea how to build the transmitter. | ||
| * All amplifiers are LM358N | * All amplifiers are LM358N | ||
| + | Cannot upload pictures:/ | ||
| **Step 2:** simulation by LTspice (maybe little tutorial how to use ltspice would be more than good) | **Step 2:** simulation by LTspice (maybe little tutorial how to use ltspice would be more than good) | ||
| + | Cannot upload pictures:/ | ||
| **Step 3:** Photo of actual prototype | **Step 3:** Photo of actual prototype | ||
| - | + | Cannot upload pictures:/ | |
| + | **Step 4:** stay tuned | ||