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Old 05-30-2012, 12:47 AM #1
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Default How to measure the power of Laser Show?

Hi Guys,

I bought a 1W RGB laser from China and I wanna discovery if the mw of green, red and blue lasers are trully real.

So how can I measure that ?

Thanks
Marcel


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Old 05-30-2012, 01:48 AM #2
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Default Re: How to measure the power of Laser Show?

Buy or rent a meter and check what the combined power of all the color channels output is. Usually it's pretty much on target, if not a little more powerful than the rating. Remember that the projector's power rating is the combined output of all the lasers, not the individual channels.
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Old 05-30-2012, 02:28 AM #3
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Default Re: How to measure the power of Laser Show?

Quote:
Originally Posted by Bionic-Badger View Post
Buy or rent a meter and check what the combined power of all the color channels output is. Usually it's pretty much on target, if not a little more powerful than the rating. Remember that the projector's power rating is the combined output of all the lasers, not the individual channels.
Hi Bionic,
but how kind meter I must buy ? It has to work with a specific spectrum or model ? And sould I buy in a eletronic store? Im eletronic engineer but never saw this kind of light instrument (only multimeter, oscilocope, etc).
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Old 05-30-2012, 04:34 AM #4
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Default Re: How to measure the power of Laser Show?

It is said that u need a power meter

Last edited by LASEVER; 05-30-2012 at 04:41 AM. Reason: edit
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Old 05-30-2012, 04:42 AM #5
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Default Re: How to measure the power of Laser Show?

You need a Laser power meter which is usually a thermophile sensor calibrated for a certain range of lasers, such as all the ones you have. They can give highly accurate measurements.
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Old 05-30-2012, 06:49 AM #6
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Default Re: How to measure the power of Laser Show?

You can give us links and pictures of the unit , we do often revieuws of produckts here , might give a little help
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Old 05-30-2012, 01:01 PM #7
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Default Re: How to measure the power of Laser Show?

Hi,
research in these forums I discovered that:

I have two options:

1. Buy one (laser meter or photometer)
Handheld Laser Power Meter | Edmund Optics
Digital Laser Photometer | Edmund Optics
Coherent Inc. A wide range of laser power and energy meters.

Luximeter
Luxmetro Medidor de Intensidade de Lux-Luz Digital LDR-208
Consigo Som & Imagem &raquo Flash, Iluminao & Estdio &raquo Acessrios &raquo Fotometros (Medidor de Luz)
Of couse, its a expensive alternative.

2. Home made one:

Catalogue of options:
LaserBee I Thermopile Based Laser Power Meter

Types:
IR thermometer
Simple Laser Power Meter Using IR Thermometer

thermophile sensor:
DIY: Laser Power Gauge
D4Thing micro hotplate controller and laser power meter display
DIY Laser Power Meter
LED light sensor - YouTube
OPHIR 20C-A Thermopiles

led sensor
LEDs as light sensors
LED/photo diode laser power meter
Issues:
- calibration the measurement is a critical point. Its need find a reference laser power.
- spectrum sensibility (nm) is other point to consider

In my opinion the led/diode sensor is a better aproach than thermal sensor
because in fact we wanna mesuare photons beam intensity not heat.

So for resume, anyone knows a reference source laser with a guarantee power ? For example 100 mw.

In fact we should need at least 3 reference sources to interpolate the sensor responsive curve that will be translated in volts shown by multimeter.

Thanks
Marcel
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Old 05-30-2012, 04:59 PM #8
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Default Re: How to measure the power of Laser Show?

Quote:
Originally Posted by marcelf View Post
Hi,
research in these forums I discovered that:

I have two options:

1. Buy one (laser meter or photometer)
Handheld Laser Power Meter | Edmund Optics
Digital Laser Photometer | Edmund Optics
Coherent Inc. A wide range of laser power and energy meters.

Luximeter
Luxmetro Medidor de Intensidade de Lux-Luz Digital LDR-208
Consigo Som & Imagem &raquo Flash, Iluminao & Estdio &raquo Acessrios &raquo Fotometros (Medidor de Luz)
Of couse, its a expensive alternative.

2. Home made one:

Catalogue of options:
LaserBee I Thermopile Based Laser Power Meter

Types:
IR thermometer
Simple Laser Power Meter Using IR Thermometer

thermophile sensor:
DIY: Laser Power Gauge
D4Thing micro hotplate controller and laser power meter display
DIY Laser Power Meter
LED light sensor - YouTube
OPHIR 20C-A Thermopiles

led sensor
LEDs as light sensors
LED/photo diode laser power meter
Issues:
- calibration the measurement is a critical point. Its need find a reference laser power.
- spectrum sensibility (nm) is other point to consider

In my opinion the led/diode sensor is a better aproach than thermal sensor
because in fact we wanna mesuare photons beam intensity not heat.

So for resume, anyone knows a reference source laser with a guarantee power ? For example 100 mw.

In fact we should need at least 3 reference sources to interpolate the sensor responsive curve that will be translated in volts shown by multimeter.

Thanks
Marcel
The Thermopile options are going to be much more reliaible and accurate for measuring power. Many good meters will come per-calibrated to adjust for variances between wavelengths (either automatically or with a simple equation). There are also a few users on this board that sell their own LPMs which are very well made and calibrated.
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Old 06-01-2012, 12:09 AM #9
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Default Re: How to measure the power of Laser Show?

Yeah, a thermopile (TEC) sensor-based meter will be the type you'll want, not photodiodes/LEDs, etc. The thermopile sensors measure heat from an absorptive surface, so it isn't wavelength dependent (for a good surface). The photodiode/LED-based sensors measure the photonic response of the diode, and that can vary with wavelength.

You can buy a meter from one of the members in the forum, or eBay or other places, for example the Laserbee. They're useful for metering all your lasers and can be helpful when selling lasers so that you can cite measured power output.
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