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How to simulate an IR Emitter & Detector?

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.
 
R

Rich Grise

Jan 1, 1970
0
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
 
M

martin griffith

Jan 1, 1970
0
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)




martin

Serious error.
All shortcuts have disappeared.
Screen. Mind. Both are blank.
 
R

Rene Tschaggelar

Jan 1, 1970
0
Rich said:
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?

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
 
M

Mark Jones

Jan 1, 1970
0
Rich said:
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

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.
 
I

idiosyncratic

Jan 1, 1970
0
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.
 
J

James Meyer

Jan 1, 1970
0
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?

Jim
 
R

Rich Grise

Jan 1, 1970
0
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.

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

Cheers!
Rich
 
R

Rich Grise

Jan 1, 1970
0
Just curious... How are you simulating the inertia of the suspended
object?

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
 
J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that Rich Grise <[email protected]>
wrote (in said:
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.
 
R

Rich Grise

Jan 1, 1970
0
I read in sci.electronics.design that Rich Grise <[email protected]>

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.

So, naturally, determining those component values is left as an exercise
for the reader, right? ;-)

Cheers!
Rich
 
J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that Rich Grise <[email protected]>
wrote (in said:
So, naturally, determining those component values is left as an exercise
for the reader, right? ;-)
No. There are scaling factors involved which are specific to the problem
to be solved, so there are no simple general formulae. There are many
textbooks that treat the subject in depth, such as 'Dynamical Analogies'
by Michael Gayford.
 
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