Power increase, NiMh 1.2v vs. Lithium 1.7v

[k-shell]

Re: Power increase, NiMh 1.2v vs. Lithium e2 1.7v

Yea i guess

 

[k-shell]

Re: Power increase, NiMh 1.2v vs. Lithium e2 1.7v

Ok I just put it on the energy meter.

At 2.4v with the collimator lens on I get 22mw, with the collimator off and the diode as close to the meter as possible I get 82mw...

Is this possible because its not IR filtered?

 

[Cyparagon]

Re: Power increase, NiMh 1.2v vs. Lithium e2 1.7v

That's not even possible, dude. 17mA at 2.4V is 40mW. You're claiming your laser is operating at 200% efficiency. Are you using a lasercheck?

maybe its a 10 or 20 mw one?

It should be less than 5mW at that current. Quite possibly class II

 

[Hemlock_Mike]

Re: Power increase, NiMh 1.2v vs. Lithium e2 1.7v

I run all my greenie pens with e2 lithiums. Only a couple failed to show increased output. You are showing classic symptoms of excess IR.

Mike

 

[k-shell]

Re: Power increase, NiMh 1.2v vs. Lithium e2 1.7v

That's not even possible, dude. 17mA at 2.4V is 40mW. You're claiming your laser is operating at 200% efficiency. Are you using a lasercheck?

[quote author=john_lawson link=1220817258/0#12 date=1220849918]maybe its a 10 or 20 mw one?

It should be less than 5mW at that current. Quite possibly class II[/quote]

I know, it shouldn’t be such a high power, I was wondering how I get more output then I am putting in. well one thing to consider is that when I measured the current going into the driver I was using a variable DC power supply, but when I measured the output power I was using NiMh batteries. So I don’t know what the current really was or if that even makes a difference.

The meter I was using was the PM120 from ThorLabs. The unit is brand new and was $1300. So id imagine the calibration is still good...
The sensor is wide range 200 - 1800nm and 5nW to 500mW.

I can take a video of the whole thing hooked up to a variable PS and shine it into the energy meter tomorrow.
But I’m perplexed???

 

[Hemlock_Mike]

Re: Power increase, NiMh 1.2v vs. Lithium e2 1.7v

WOWWWWWW -- What a meter
You need to measure current and power so you can report to us !!!!!
A bench supply sure eliminates battery sag.

Mike

 

[k-shell]

Re: Power increase, NiMh 1.2v vs. Lithium e2 1.7v

Alright, here’s a little something I put together:

(Let theses download!)

This is a sweep from about its cutoff voltage to the highest voltage I feel comfortable with (3.0v).

---

And I take back what I said before, I guess you can see an increase from 2.4 to 3.0  

 

[k-shell]

Re: Power increase, NiMh 1.2v vs. Lithium e2 1.7v

Ahh Crap, I feel like a fool

I got all my units screwed up  

The power supply is in amps, not ma.

so everything i measured, multiply by x10

now things make sense!!!

Stupid me, LOL... Doh!


anyways i got some more animations...

in this you can see that the NiMh's do drive the diode at 2.4V. at the end of this clip i dont see much of a diffrence...

 

[Cyparagon]

Okay, so 800mW input is more reasonable.

IR diodes are no more than 40% efficient. The pump should be emitting 320mW or so 80mW sounds more reasonable. It may be a peak reading, but still feasible.

 

[t3rmanater]

hmm