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IR Diode v. Laser for Timing
From: "konehead" <konehead@msn.c*>
To: <pes_gmeg@yahoogroups.com>
Sent: Wednesday, June 02, 2004 9:07 AM
Subject: Re: [pes_gmeg] Q: IR Diode v.
Laser for timing
I think a "laser diode" is actually just a light-emitting diode and laser-diode is really just an incorrect term for this common timing mechanism like the guy says.... Halleffects willwork too - they have ones now that will respond to just a magnet - no power supply needed. Only thing is if the magnetice fields of the strong magnets will affect them (why you go to light-triggers) Mechanical commutators will work out to be the best effeciency still I would bet - and still in electric cars today, brushes on DC motors work out the best for example....5yrs replacement time, and they are easy to replace. trick: Switch at the hi (pos) and the (lo) end of the motor coils simultanaeous and vary the timing overlap to give yourself best backemf/recoil output (by way of FWBR over both switches now catching both ways) and also the timign-overlap can be adjusted to make ulstra small pulse width so resonance with recoil.back emf will happen. (big pulse width will muffle any ring) ciaoKonehead ----- Original Message ----- From: Sterling D. Allan <sterlingda@pureenergysystems.c*> To: PES Gray Motor Open Sourcing e-group <pes_gmeg@yahoogroups.com> Sent: Wednesday, June 02, 2004 7:44 AM Subject: [pes_gmeg] Q: IR Diode v. Laser for timing > > Maybe one of you has some insight on this. > > ----- Original Message ----- > From: "Sterling D. Allan" <sterlingda@pureenergysystems.c*> > To: [G.M.] > Sent: Tuesday, June 01, 2004 11:59 AM > Subject: IR Diode v. Laser > > > Hi Gary, > > An associate has made the following recommendation: > > Rather than use a laser diode for timing, why not use an IR diode. By IR > diode he referred to "both pass-through and reflective that are made to > measure physical displacement, cheap and reliable and use a banal > IR-emitting LED, not a Laser-Diode." > > He also asks, "why use the term laser diode? why not use a banal IR-LED. > Little components that incorporate both IR-LED and phototransistor are cheap > and widely available." He tends to think you "do not need coherent light > from a laser." > > Comment? > > Sterling Page posted by SDA,
June 12, 2004 |
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