- #1

- 3

- 0

## Main Question or Discussion Point

Hi Everyone!

There is a type of CO2 laser cutter power meter on the market (Product link removed)

The meter uses a block of black anodized aluminum bonded to the end of basically a mechanical meat thermometer, and has a zero adjustment on the back of the face to set the base temperature to room temperature, and a reskinned dial that indicates the temperature as watts.

To use it, you shine the laser's defocused beam onto the target for a prescribed number of seconds as indicated on the calibration tag on each meter (such as "37.7 seconds"), then turn the laser off. You then watch the meter to see how high the indicator needle travels as it will continue to rise, and the peak is your wattage reading for the laser's power.

What's the math behind the calculation that this meter uses to calculate the wattage of the laser's beam?

I'm guessing that IF you know

o Mass of the target body

o Time of energy imparted on the target

o Temperature rise over the interval of time

then you can calculate the watts that have been imparted on the target.

Am I correct in this guess?

What would the equation be for this?

Also, how would you adjust the equation to handle how much the target absorbs or reflects the energy from the laser (for example, if you used anodized aluminum for the target versus other materials)?

Thank you very much!

--Jim

There is a type of CO2 laser cutter power meter on the market (Product link removed)

The meter uses a block of black anodized aluminum bonded to the end of basically a mechanical meat thermometer, and has a zero adjustment on the back of the face to set the base temperature to room temperature, and a reskinned dial that indicates the temperature as watts.

To use it, you shine the laser's defocused beam onto the target for a prescribed number of seconds as indicated on the calibration tag on each meter (such as "37.7 seconds"), then turn the laser off. You then watch the meter to see how high the indicator needle travels as it will continue to rise, and the peak is your wattage reading for the laser's power.

What's the math behind the calculation that this meter uses to calculate the wattage of the laser's beam?

I'm guessing that IF you know

o Mass of the target body

o Time of energy imparted on the target

o Temperature rise over the interval of time

then you can calculate the watts that have been imparted on the target.

Am I correct in this guess?

What would the equation be for this?

Also, how would you adjust the equation to handle how much the target absorbs or reflects the energy from the laser (for example, if you used anodized aluminum for the target versus other materials)?

Thank you very much!

--Jim

Last edited by a moderator: