How to simulate an IR Emitter & Detector?

Guest
Hi,

I am simulating a Magnetic levitation circuit in Multisim and I am
having problems simulating the IR Emitter and Detector. How do I
simulate the varying resistance of the circuit depending on the
position of the levitated object?

Any suggestions of doing this in Multisim or any other package will be
much appreciated.

Thanks.
 
On Fri, 28 Jan 2005 10:27:11 -0800, rishabh.sinha wrote:

Hi,

I am simulating a Magnetic levitation circuit in Multisim and I am
having problems simulating the IR Emitter and Detector. How do I
simulate the varying resistance of the circuit depending on the
position of the levitated object?

Any suggestions of doing this in Multisim or any other package will be
much appreciated.
Click to expand...
Get a physical LED, and physical photodiode or phototransistor (i.e., your
detector), a power supply, a multimeter, and a piece of cardboard, and
_measure_ the silly thing!

Doesn't anybody do anything _real_ any more?

Good Luck!
Rich
 
On Fri, 28 Jan 2005 20:09:04 GMT, in sci.electronics.design Rich Grise
<richgrise@example.net> wrote:

On Fri, 28 Jan 2005 10:27:11 -0800, rishabh.sinha wrote:

Hi,

I am simulating a Magnetic levitation circuit in Multisim and I am
having problems simulating the IR Emitter and Detector. How do I
simulate the varying resistance of the circuit depending on the
position of the levitated object?

Any suggestions of doing this in Multisim or any other package will be
much appreciated.


Get a physical LED, and physical photodiode or phototransistor (i.e., your
detector), a power supply, a multimeter, and a piece of cardboard, and
_measure_ the silly thing!

Doesn't anybody do anything _real_ any more?

Good Luck!
Rich

not since the group Weller died (msg :Weller WTCPN Problems)
Click to expand...




martin

Serious error.
All shortcuts have disappeared.
Screen. Mind. Both are blank.
 
Rich Grise wrote:
On Fri, 28 Jan 2005 10:27:11 -0800, rishabh.sinha wrote:

I am simulating a Magnetic levitation circuit in Multisim and I am
having problems simulating the IR Emitter and Detector. How do I
simulate the varying resistance of the circuit depending on the
position of the levitated object?

Any suggestions of doing this in Multisim or any other package will be
much appreciated.

Get a physical LED, and physical photodiode or phototransistor (i.e., your
detector), a power supply, a multimeter, and a piece of cardboard, and
_measure_ the silly thing!

Doesn't anybody do anything _real_ any more?
Click to expand...
Naa,
the solder iron is too heavy, there are too many dials on
a scope and there comes real electricvty out of a power
supply. And the investment ...

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net
 
Thanks Mark,

That's exactly the point. I already have the physical setup and was
trying to do a simulation of the same for future modifications to the
circuit.

Thanks for the tip.
 
On 28 Jan 2005 18:24:38 -0800, "idiosyncratic" <rishabh.sinha@gmail.com> wroth:

Thanks Mark,

That's exactly the point. I already have the physical setup and was
trying to do a simulation of the same for future modifications to the
circuit.

Thanks for the tip.
Click to expand...
Just curious... How are you simulating the inertia of the suspended
object?

Jim
 
On Fri, 28 Jan 2005 16:57:37 -0500, Mark Jones wrote:
Rich Grise wrote:
On Fri, 28 Jan 2005 10:27:11 -0800, rishabh.sinha wrote:

I am simulating a Magnetic levitation circuit in Multisim and I am

Doesn't anybody do anything _real_ any more?

I think he wants to learn how to simulate the effects of the maglev
feedback sensor in software, not just get an answer.

Sounds tricky.
Click to expand...
Yeah. What's the transfer function of a lump of metal hanging from a
solenoid, with optical position feedback? ;-)

Cheers!
Rich
 
On Sat, 29 Jan 2005 14:46:20 +0000, James Meyer wrote:

On 28 Jan 2005 18:24:38 -0800, "idiosyncratic" <rishabh.sinha@gmail.com> wroth:

Thanks Mark,

That's exactly the point. I already have the physical setup and was
trying to do a simulation of the same for future modifications to the
circuit.

Thanks for the tip.

Just curious... How are you simulating the inertia of the suspended
object?
Click to expand...
Thinking of a weight, hanging there by a magnetic field, that's controlled
on a time scale probably much shorter than the time constant of the
solenoid, where the farther away it gets, the less pull there is....

Got it!

Negative Inductance!

(in parallel, of course, with imaginary capacitance.)

;-)
Rich
 
I read in sci.electronics.design that Rich Grise <richgrise@example.net>
wrote (in <pan.2005.01.29.20.35.43.740163@example.net>) about 'How to
simulate an IR Emitter & Detector?', on Sat, 29 Jan 2005:
Yeah. What's the transfer function of a lump of metal hanging from a
solenoid, with optical position feedback? ;-)

Any such system can be modelled electrically. We do it all the time with
Click to expand...
loudspeakers and microphones. Both the acoustic and the mechanical parts
of the transducers can be modelled as RLC circuits.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
Rich Grise wrote:
On Fri, 28 Jan 2005 10:27:11 -0800, rishabh.sinha wrote:


Hi,

I am simulating a Magnetic levitation circuit in Multisim and I am
having problems simulating the IR Emitter and Detector. How do I
simulate the varying resistance of the circuit depending on the
position of the levitated object?

Any suggestions of doing this in Multisim or any other package will be
much appreciated.



Get a physical LED, and physical photodiode or phototransistor (i.e., your
detector), a power supply, a multimeter, and a piece of cardboard, and
_measure_ the silly thing!

Doesn't anybody do anything _real_ any more?

Good Luck!
Rich
Click to expand...
I think he wants to learn how to simulate the effects of the maglev
feedback sensor in software, not just get an answer.

Sounds tricky.

If your simulation software will let you build "devices" out of SPICE
primitives (VCVS, ICRS, etc,) then this is the way to go. Think of the
problem not in terms of volts and amps but how the different aspects
of the desired movement reflect changes in the circuit output, then
design a schematic to do just that. You'll need to setup the IR in
prototype anyways, to verify your results (no such thing as a free
lunch.) Have fun.
 
On Sat, 29 Jan 2005 20:43:13 +0000, John Woodgate wrote:

I read in sci.electronics.design that Rich Grise <richgrise@example.net
wrote (in <pan.2005.01.29.20.35.43.740163@example.net>) about 'How to
simulate an IR Emitter & Detector?', on Sat, 29 Jan 2005:

Yeah. What's the transfer function of a lump of metal hanging from a
solenoid, with optical position feedback? ;-)

Any such system can be modelled electrically. We do it all the time with
loudspeakers and microphones. Both the acoustic and the mechanical parts
of the transducers can be modelled as RLC circuits.
Click to expand...
So, naturally, determining those component values is left as an exercise
for the reader, right? ;-)

Cheers!
Rich
 
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