PWM signal on an LED, caught by a digital camera

Artifacts of the PWM signal on the digital camera, appearing as vertical dashed lines emanating from the LEDs, can be used to measure the PWM duty cycle. Just take a still from such a video, and divide the length of a "light dash" (in pixels) by the distance between the beginnings of two dashes. In this particular case I got an accuracy of ~5%.

PWM signal on an LED, caught by a digital camera scope realty
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Science & Technology	Upload TimePublished on 4 Nov 2013

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