I did this! First trial version gave the same patterns you got. Then I improved my apparatus and got totally different patterns. One was a circle whose radius would vary from nearly zero to a maximum and then to zero again, etc. Could not get the original patterns. Very puzzling. Found out that the direction of rotation of the mirrors makes a difference. If they rotate in the same direction, you get one set of patterns. Different directions, different patterns. -Fun for an Old physics guy.
I have a question. If you watch the video for about 2:00, the star figure almost not rotate. But when you look at 2:30, why is the picture rotating counterclockwise? I made that it as a slow video. As a result, when the figure was not rotated, the figure draws a closed curve, but when it rotates, it draws an open curve. If that laser draw open curve, that shape rotate? What conditions draw an open curve? What is the ratio of the frequency of the motor to the closed or open curve? If you can tell me the title of the related paper, I will read it.
Are Lissajous patterns and spirograph patterns the same thing? I thought spirographs were hypotrochoids, epitrochoids, etc....there's a bunch of similar shapes)
Nikola Tesla yes, both mirrors have a slight wobble as they spin on the motor shaft. Each mirror then causes the light to form a circle as it is reflected.
I think the best pictures are when the ratios of the speeds of the motors are whole numbers for example on motor is spinning 3 times faster than the other
Hi Bruce. Thank you for this great work! I notice you're explaining stable patters develop when the speeds of the two motors are whole number ratios. Two questions: (A) Is there a way to measure speed of the two motors reliably (and inexpensively) enough to have students find the relationship between stable patterns and simple ratios? (B) have you explored ways to connect this idea to music theory--why some intervals sound "nicer" than others?
these motors are fairly common and available on many electronic supply sites. they are rated at 1.5 to 3 volts or higher. In this case I am running them on 3 volts
Alessio Santoro I have several lasers that work with this demonstration, an old Helium Neon laser that I've had for years was my original source of light but I've since switched to using laser pointers that are readily available can be purchased at a variety of stores, or online. I have purchased a few at Walmart, some hardware stores carry them, I even have one that I purchased at a dollar store. they will all work just fine.
I did this! First trial version gave the same patterns you got. Then I improved my apparatus and got totally different patterns. One was a circle whose radius would vary from nearly zero to a maximum and then to zero again, etc. Could not get the original patterns. Very puzzling.
Found out that the direction of rotation of the mirrors makes a difference. If they rotate in the same direction, you get one set of patterns. Different directions, different patterns.
-Fun for an Old physics guy.
You deserve a thumbs up and a response for that comment. 👍👍
Awesome!
@@elliotburing87 Thanks, Elliot! I had totally forgotten about this.
Wow... it is really really beautiful moments
This is amazing, seriously a great stuff. Thanks for all your videos.
I'm doing this for Pi Day. Thanks for the explanation. I was having a difficult time finding an explanation! Bruce nailed it for me at 0:26-0:33
Glad it was helpful!
I have a question. If you watch the video for about 2:00, the star figure almost not rotate. But when you look at 2:30, why is the picture rotating counterclockwise? I made that it as a slow video. As a result, when the figure was not rotated, the figure draws a closed curve, but when it rotates, it draws an open curve. If that laser draw open curve, that shape rotate? What conditions draw an open curve? What is the ratio of the frequency of the motor to the closed or open curve? If you can tell me the title of the related paper, I will read it.
Wow, awesome demonstration!
Rubix Cube
The motor direction also affects the patterns.
If both same direction or one opposite to the other.
Loved it! Thanks!
So sorry simple, so awesome!
Thank you coz I'm getting into DJing I'll be able to make an awesome light show laser projector for next to nothing
Try attaching the laser to a chladni plate. Your own music will have an effect on the light show.
How can we measure the phase difference
How the speed of motors changes the pattern???
It's just reflection !! With pahse chage in source how it happens ??
R u tilted mirror's
Have you tried doing this with the laser attached to a chladni plate?
Are Lissajous patterns and spirograph patterns the same thing? I thought spirographs were hypotrochoids, epitrochoids, etc....there's a bunch of similar shapes)
Gracias.... me guso mucho... pienso hacerlo en alguna ocasion...
What about adding a 3rd mirror, would that give an extra plane for the laser to make shapes say 3 dimensional?
SpydreX Official umm, no
is that happening because a mirror isnt in a perfect plane?
Nikola Tesla yes, both mirrors have a slight wobble as they spin on the motor shaft. Each mirror then causes the light to form a circle as it is reflected.
phenomenal.
It's tilted
Nice project sir...
is it possible to make actual images instead of shapes like they did with lights on fans?
the aim and the theory of this is that because of unmatched frequency designs are formed?
I think the best pictures are when the ratios of the speeds of the motors are whole numbers for example on motor is spinning 3 times faster than the other
this is awesome
can anyone tell the song being played??
@@AveryTheHorror lmao
Hi Bruce. Thank you for this great work! I notice you're explaining stable patters develop when the speeds of the two motors are whole number ratios. Two questions: (A) Is there a way to measure speed of the two motors reliably (and inexpensively) enough to have students find the relationship between stable patterns and simple ratios? (B) have you explored ways to connect this idea to music theory--why some intervals sound "nicer" than others?
You can do it with a membrane, a speaker, a laser and a little mirror.
What is the voltage in the motors??
these motors are fairly common and available on many electronic supply sites. they are rated at 1.5 to 3 volts or higher. In this case I am running them on 3 volts
Thanks!!
which is the name of the laser? where i could find it?
Alessio Santoro
I have several lasers that work with this demonstration, an old Helium Neon laser that I've had for years was my original source of light but I've since switched to using laser pointers that are readily available can be purchased at a variety of stores, or online. I have purchased a few at Walmart, some hardware stores carry them, I even have one that I purchased at a dollar store. they will all work just fine.
This is Art.
Can someone refer to any theoretical work on this?
awsome
Hello Bruce, cool video - will you look at my lisajou laser videos too?
I did, nicely done!
yukari yakumo's speaker loud 🔊
coool
😊
yukari yakumo speaker L 🔊 R🔊
Pk