Hi, I'm looking to simulate propagation of a sine wave through a silicone mould we are creating (In the direction indicated below). I was planning on doing this by varying the voltage in each on the wires over time, with some lag in the variation, to give the effect of a sine wave moving along the mould.



Does anyone possibly have some suggestions on what could be used to effectively vary the analog voltage in each of the wires over time, or other simpler methods to achieve the goal?

Thanks

 

How does varying the voltage in a wire that does not form a complete circuit accomplish anything? What are you hoping to observe?

 

Hello there , welcome to AAC! are you looking for a visual representation of a sine wave?
Does the silicone mold have any special properties?
Could you please elaborate?

 

Hello there , welcome to AAC! are you looking for a visual representation of a sine wave?
Does the silicone mold have any special properties?
Could you please elaborate?

Thanks for replying, the silicon is to be mildly doped with graphene to give a degree of electrical conductivity.

A measuring device, consisting of an array of discrete electrodes is then placed in top of the silicon to record the voltage at different points on the silicon surface.

This is done over time such that the variation in voltage over the mould surface can be mapped.

The varying voltages plotted against time will ideally give the visual of a sine wave propagating down the length of the mould, just so we have something distinct to validate against.

Hopefully this makes a bit of sense, I can draw a diagram of anything specific that might help?

 

How does varying the voltage in a wire that does not form a complete circuit accomplish anything? What are you hoping to observe?

We don't need to observe any current flow, just need to observe the discrete voltage of multiple points on the mould surface over time.

 

Does it have to be a sine-wave? It would be dead easy with a squarewave!

 

See

 

Thanks for replying, the silicon is to be mildly doped with graphene to give a degree of electrical conductivity.

A measuring device, consisting of an array of discrete electrodes is then placed in top of the silicon to record the voltage at different points on the silicon surface.

This is done over time such that the variation in voltage over the mould surface can be mapped.

The varying voltages plotted against time will ideally give the visual of a sine wave propagating down the length of the mould, just so we have something distinct to validate against.

Hopefully this makes a bit of sense, I can draw a diagram of anything specific that might help?

Can you draw an electrical representation of the mould surface?

 

How many outputs from the power source do you need? You have drawn 14. Is this just an example or a requirement?
How pure a sign wave do you need? Could the wave be constructed with a limited number of steps?
What frequency?
What voltage?
What will the load current be (what is the resistance of the silicone/graphene substance)?

Basically, it can be done. My thinking is digital - use a micro-controller with a number of D to A outputs (or filtered PWM outputs), construct the sine wave with voltage (or PWM) steps probably from a look-up table in memory. Each output might require an amplifier to get the voltage swing you need.

Analog could be done with a delay line probably but would require massive capacitors and inductors at a low frequency!

 

I was going to suggest a version of the CD4018 circuit, but I was waiting for further information.