FS: Rubicon Laser Power Meters

[142laser]

Nah, just press one at a time to see which one is the ejection seat!

[ARGLaser]

wouldn't it make some sense to identify the 4 buttons on
your enclosure?

Thanks for the suggestion, I will look into that.

The UI is very intuitive and the function of each button is clear after a few minutes of use. The function of the four buttons (select, up, down, function) is detailed in the Rubicon users manual.

[Eidetic]

This looks like a very well made and professional quality meter. Top of my list for the next one I buy.

[White-Light]

Are these 'safe' enough for reliable audience scanning evaluations? Am looking into my options at the moment...

The trouble you're going to have is finding a suitable head to take the measurement as I believe the Ophir 20C-A won't cut it for direct MPE measurement which is most people's head of choice as they're relatively cheaply available. For a straight power measurement, the Ophir is fine.

The minimum measurable power on the 20C-A is 20mw with an accuracy of +/- 3% (http://www.ophiropt.com/laser/pdf/20...-A_20C-UAU.pdf), which equates to 19.4mw in the more sensitive direction, by my maths.

With a 12mm diameter sensor you have a sensor area of 113mm 2.

So that's a 19.4mw measurement spread over 113mm 2.

113/100 x 19.4 = 21.9mw over 100mm 2 (ie. 1cm 2 = 10x10mm)

I'm sure my maths is probably wrong here so no doubt someone will jump on this and correct it, but I make the minimum measurable power density on the 20C-A sensor to be 21.9mw cm 2 - that's a 19.4mw reading on the 12mm aperture.

As MPE is 10mw cm2, its only suitable for laser power measurement not MPE measurement.

You need a sensor with a lower minimum power measurement capability.

This doesn't in any way reflect on the meter of course which is probably capable of MPE measurements when paired with a suitable sensor.

[ARGLaser]

The trouble you're going to have is finding a suitable head to take the measurement as I believe the Ophir 20C-A won't cut it for direct MPE measurement which is most people's head of choice as they're relatively cheaply available.

The minimum measurable power on the 20C-A is 20mw with an accuracy of +/- 3% (http://www.ophiropt.com/laser/pdf/20...-A_20C-UAU.pdf), which equates to 19.4mw in the more sensitive direction, by my maths.

With a 12mm diameter sensor you have a sensor area of 113mm 2.

So that's a 19.4mw measurement spread over 113mm 2.

113/100 x 19.4 = 21.9mw over 100mm 2 (ie. 1cm 2 = 10x10mm)

I'm sure my maths is probably wrong here so no doubt someone will jump on this and correct it, but I make the minimum measurable power density on the 20C-A sensor to be 21.9mw cm 2 - that's a 19.4mw reading on the 12mm aperture.

As MPE is 10mw cm2, its only suitable for laser power measurement not MPE measurement.

You need a sensor with a lower minimum power measurement capability.

This doesn't in any way reflect on the meter of course which is probably capable of MPE measurements when paired with a suitable sensor.

Thanks for the math! I stand corrected
I did not know MPE was calculated in that way.

[White-Light]

I'm not saying it is. I'm sure I'm probably wrong and someone who's done the safety course, will correct me.

All I'm saying as a few people have mentioned the Ophir head is that I don't believe its suitable for use with any meter as a direct MPE head for use with the simple method, because I believe the minimum power density it can measure is too high. So I believe its more suited to straight power measurements or MPE where you measure the power at the aperture and then calculate the long way around using divergence etc.

If anyone buying your meter wants to use it specifically for direct MPE measurement using the simple method, then they probably need to pair it with a head which can measure below 20mw minimum.

It is a very nice meter btw and paired with the right head will be a great purchase.

I'd certainly buy one for power measurement and with a different head for MPE.

[badger1666]

Question : can the firmware be modded to have more ranges ? Ie 5to10w and 10to20w
As a heatsinked 20C-A head can measure these powers

[ARGLaser]

Question : can the firmware be modded to have more ranges ? Ie 5to10w and 10to20w
As a heatsinked 20C-A head can measure these powers

Sending you a PM about this

[als1980]

Sending you a PM about this

Could you please forward me these instructions as well? I have an ophir 150-a-.3 that needs heating above 5w. I'm also confused at to max power to be read. I can supply 24v max and at .3 v/w I can't hit the 150.
Thanka

[flecom]

does the version without the sensor come with the cable to go to the sensor?