D2000
Enlightened
Hi guys and girls,
Not sure if this is the right place for it but it seems like it. Basically what the title says - I have a new spinning top that can spin really REALLY fast, especially if spun up to speed with an air compressor. During the speed up I notice that even to the naked eye I can see the rolling shutter effect whilst my LED light is over it. (The rolling shutter effect is the effect you see when a car wheel appears stationary or even rolling backwards, whilst in motion under a street lamp, or on camera)
I notice the cycles of the rolling shutter effect occur about 10 times during the process of it ramping up. I figure that when the spinning top appears stationary in the light, its reached a multiple of the frequency of the PWM of the LED. (100, 200, 300, 400, 500 etc..)
For example:
The LED PWM is 100Hz. During the speed up I see the spinning top as a static image (rolling shutter effect) 5 times. That means the 5th time I see the spinning top slow down to a still image that frequency is the 5th multiple of 100(Hz), making the spin calculated to 500 times a second, (which would be 30000 RPM)
Is this process of deduction or logic correct?
I will edit this post with a link to a YouTube video of it, once it finishes uploading.
EDIT:https://youtu.be/cjmQUdcnVu4
Thanks,
Dave
Not sure if this is the right place for it but it seems like it. Basically what the title says - I have a new spinning top that can spin really REALLY fast, especially if spun up to speed with an air compressor. During the speed up I notice that even to the naked eye I can see the rolling shutter effect whilst my LED light is over it. (The rolling shutter effect is the effect you see when a car wheel appears stationary or even rolling backwards, whilst in motion under a street lamp, or on camera)
I notice the cycles of the rolling shutter effect occur about 10 times during the process of it ramping up. I figure that when the spinning top appears stationary in the light, its reached a multiple of the frequency of the PWM of the LED. (100, 200, 300, 400, 500 etc..)
For example:
The LED PWM is 100Hz. During the speed up I see the spinning top as a static image (rolling shutter effect) 5 times. That means the 5th time I see the spinning top slow down to a still image that frequency is the 5th multiple of 100(Hz), making the spin calculated to 500 times a second, (which would be 30000 RPM)
Is this process of deduction or logic correct?
I will edit this post with a link to a YouTube video of it, once it finishes uploading.
EDIT:https://youtu.be/cjmQUdcnVu4
Thanks,
Dave
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