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Laser to refract/reflect water vapor and smoke.... angles?
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[QUOTE="MattLogue9, post: 6304206, member: 674243"] Building visibiity sensor... What is best angle to detect water vapor reflection from laser, and refraction? I plan to have two open cylindrical containers painted flat black and put inside each other so the overlap is about 0.5-1" (adj to limit ambient light vs airflow). Laser is cheap red laser diode. dime a dozen deal. Laser points straight thru a plywood hole to target. I plan on using red LEDs to sense since I don't have photodiodes. It goes to Mux, then a LM324 set to ouput 0-1V, then ESP32 MCU ADC. I figure I can work with ratio of fore and aft LED V to determine air contents to some degree. Water refracts of course, dust, smoke, pollen reflect. Precision is NOT critical. Accuracy somewhat. I just want to be able to say, real foggy, foggy, dusty, or clear. Thats it. It will be paired with Temp, Hum, Rainfall, RGB UV Sunlight load, Soil Moisture, Wind Vector, Lightning detectors. It may also be paired with MOx gas sensors... 1 So what angles should I use? 2 What is good method to block out ambient light yet maintain airflow and not condense the water vapor? 2a Pulsed laser and differential signalling? 2b Overlapping cans like [> ? 2bb Orientation for device [] V or = H 3 Should i expect to get a viable signal from R LED and a LM324?Part of larger project: Wx Station. [/QUOTE]
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Laser to refract/reflect water vapor and smoke.... angles?
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