Dangers of PWM instead of AM with Lasers and other Aplications

Discussion in 'General Electronics Chat' started by -live wire-, Feb 8, 2018.

  1. -live wire-

    Thread Starter Active Member

    Dec 22, 2017
    828
    72
    Often, to decrease the brightness of an LED or the loudness of a speaker, the duty-cycle of a PWM is decreased, instead of the amplitude. So if you have a speaker that is loud enough to damage your hearing, or a laser diode that is bright enough to blind you, would a high-frequency PWM with a low duty-cycle protect you, or would the short bursts still be damaging? For example, would a 1W laser with a 100 kHz 1% PWM be the same as a 10 mW laser in terms of how damaging it would be? I am asking about this hypothetically, as I do not have any high-power lasers or extremely loud speakers.
     
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