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12-31-2014, 01:32 AM #1
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jaand12
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HJ-A88 doesn't light matches.

Hello,
Few days ago I bought HJ A88. In internet I saw videos like people light match with this laser in few seconds. I've got the finnest beam and when I try to light the match I only see smoke and no fire. I tried to colour match black. Any ideas?

12-31-2014, 01:42 AM #2
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Re: HJ-A88 doesn't light matches.

https://www.youtube.com/watch?v=m4SfW_RDT7c Did you try moving in closer and closer to the match like in this video? Try another type of match if that doesn't work, assuming you have it focused as best you can. Is there a strike area on the match box? Sorry, bad joke.
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Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

Online calculator to determine spot intensity at different mRad's & powers @ distances: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

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Last edited by Alaskan; 12-31-2014 at 03:40 AM.

12-31-2014, 03:02 AM #3
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ARG
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Re: HJ-A88 doesn't light matches.

Did you try striking it against fine sandpaper? I hear that lights matches very well.

In all seriousness though, if you've got it to the finest point and you colored the match black then you just don't have enough power for the job.

12-31-2014, 10:32 AM #4
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jaand12
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Re: HJ-A88 doesn't light matches.

I try with other type of match and it's working, thanks.

12-31-2014, 12:22 PM #5
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Pman
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Re: HJ-A88 doesn't light matches.

Some matches have some kind of coating on them and are much harder to light. Glad you figured that out. Now don't get the laser close enough to the match that the smoke or ignition particles ruin the lens. The lens is plastic and is VERY easy to destroy.
Also the only eyeballs you have are taking a hit if you are not wearing the appropriate glasses
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01-08-2015, 11:32 AM #6
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mortuus
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Re: HJ-A88 doesn't light matches.

how many mW is it supposed to be? sounds like its a weak laser to me..
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