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Laser to refract/reflect water vapor and smoke.... angles?
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[QUOTE="Baluncore, post: 6304929, member: 447632"] Those LM324 chips are real cheap. I think you are on a budget and want to keep the price down. The best way to solve the problem reliably, and for the minimum cost, is to use a trick called engineering. That involves thinking carefully about what you need to do, and the different ways you might do it. The next thing to think about is photodetectors. [URL]https://en.wikipedia.org/wiki/Photodiode[/URL] [URL]https://en.wikipedia.org/wiki/LED_circuit#LED_as_light_sensor[/URL] Depending on the circuit, photodiodes can generate a voltage or a current. If you use them in a linear mode, measuring a current proportional to light intensity, then you must convert the current to a voltage while operating them at a fixed voltage. Look at the circuits in this note. https://www.hamamatsu.com/resources/pdf/ssd/e02_handbook_si_photodiode.pdf [/QUOTE]
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Laser to refract/reflect water vapor and smoke.... angles?
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