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FrozenGate by Avery

Prototype LPM






Hey, great work. The more people play, the more we learn! +1 rep!

Great work, keep it coming!
 
justinjja said:
Here is a video of my prototype LPM

It is an Analog LPM, with some added features:

It can run off of nearly any power source,
as low as 2.5V and up to 9V (Designed for a single 18650)

LPM uses around 1/2 watt of electrical power so:
at 4V it consumes about 120mA
at 8V it consumes about 60mA

Has a ranging switch:
LO: 0.000W to 1.999W
HI: 0.00W to ~5.99W
(HI is not tested yet, but is expected to be around 5W)

Has 2 zero adjust pots, 1 internal, 1 external
The external adjust can adjust +- 10mW
The internal adjust can adjust +- 500mW (Users won't need to use this)

This LPM has a virtual negative rail, so it can be zero'ed after the heatsink has been warmed up by a high powered laser.

Response time is faster than the Alpha, LaserBee usb, and LaserBee analog
but not as fast as the Laserbee II or Laserbee 5W
around 30 Seconds.

I will be testing Linearity at different powers and wavelengths tomorrow when I get my Professional LPM.
I have high hopes :D
Click to expand...

justinjja said:
At a basic level my lpm uses the same concpet as the LPM described here:
http://laserpointerforums.com/f42/diy-thermal-lpm-under-50-a-51129.html
A good staring point for a diy lpm
Click to expand...
:gj:adding a X10 range switch. We've done that for a few LPMs
in our shop.

BTW... am I missing something...:thinking:
I see that you reattached the 15mm X 15mm Sensor to your used
LaserBee 2.5W USB Thermopile..
Correct me if I'm wrong..

You are partially correct. We chose the sensor for the LaserBee USB
and the LaserBee A because it had a faster response time than the
sensors being used on the Alphas.

My question is how can you claim that the response time is faster
than the LB-USB and LB-A when it is the same sensor that has the
same mass and electrical characteristics and you are using a similar
circuit to the Alpha...

AnthoT said:
Yup very nice :beer: 5W LPM
Did you use an 8mm x 8mm TEC?
Click to expand...

Unless he has changed the original LaserBee USB coating to something else..
The original coating will scorch at 2.6 Watts..

AutoItKing said:
I can vouch for the accuracy. It needs a little bit of tweaking, but I think this will be a solid LPM!
Click to expand...

You know I'm going to ask....:eg:
I'm curious as to what you actually used to vouch for the accuracy..


AnthoT said:
Wow! 750$ :eek:

Here is one ( I'm not sure if it's the one you are looking for )
Ophir 150W-OEMA Thermal OEM head | eBay
Click to expand...
Yeah the professional LPM and Head manufactures don't give them
away...

The one you linked to does not seem to have any electronics in the
head...


Jerry

You can contact us at any time on our Website: J.BAUER Electronics
 
Last edited:
Hey Jerry, thanks,
I feel the range switch is quite nice.

The sensor is entirely of my own design.
The Tec is .4in by .4in
The heatsink is IIRC slightly larger than the heatsink used by the Laserbee USB that I had
And the coating is somthing not seen before :D

I would have some numbers for you guys, but someone at UPS decided it would be a good idea deliver my Ophir LPM 2 days late :yabbmad:

Edit: size comparison Radiant Alpha and Jag lpm
photohve.jpg
 
Last edited:
Good choice... that makes sense now for the response time.
But I'm still skeptical of the 5Watt rating of your coating...:beer:

Jerry

You can contact us at any time on our Website: J.BAUER Electronics
 
Last edited:
Some results:
Calibrated against my new Ophir head

Laser 1 measured 1.45W
Laser 2 measured 2.24W

Both at the same time: 3.68W

Also, I was pointing both lasers at the same spot on my coating,
From 6in away, with G1 lenses focused to inf.
Coating held up fine at 3.68W under those conditions.
 
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