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a camera?
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Yes. One of the greatest inventions of all time and has been around for millennia. The hand.

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Hell. I've been using eyebrows this whole time.
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Thermal imaging
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These guys built a very accurate flame sensor using high voltage through the plasma as a method of building computer-controlled flame/fire effects:https://www.livesparkfire.com/
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You can also use an oxygen sensor. The presence of a flame will decrease oxygen in the gas.
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Yea I came here to say this. It's hoe cars monitor engine combustion efficiency / emissions.
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