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Old 04-26-2008, 04:51 AM   #1 (permalink)
dcb
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laser fluid detector.

Here is the setup: A 5v power supply, a laser, a 5/16 tube with a gasoline sample in it, a cds cell, and an ohmmeter. The tube is flat against the board and the laser had to be propped up a tiny bit in front to hit the CDS cell through the empty tube.





The tube is empty in front of the laser and the CDS cell is well illuminated.
It is about 1.5K ohms here:




The board is tilted and the laser gets deflected by the fluid in the tube and misses the CDS cell.
It is about 11K ohms here:


So there ya have it. One just needs to carefully drill a couple holes in a block of wood to organize this assembly. But with a jump from 1.5k ohms to 11k ohms it should be pretty easy to detect.



Here is a cheesey picture of what is going on. Note that you have to adjust for the empty tube when aligning the laser, it does not just go straight through! Also, the farther away the CDS cell is from the tube, the greater the deflection distance.

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Last edited by dcb; 07-03-2008 at 07:15 PM..
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Old 04-26-2008, 07:40 AM   #2 (permalink)
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Building a better "low fuel" idiot light?
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Old 04-26-2008, 10:22 AM   #3 (permalink)
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Actually that would be nice to have on a motorcycle. It would be much better than waiting for the engine to start cutting out in the middle of an intersection to remind you to switch to the reserve tank

Though my priority with it is a motorcycle fuel consumption monitoring system, I'd love to hear any other ideas how this could be used.
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Old 04-26-2008, 10:52 AM   #4 (permalink)
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.07 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car - '14 Mitsubishi Mirage ES (base)
90 day: 66.16 mpg (US)
Thanks: 3,942
Thanked 6,820 Times in 3,540 Posts
Ah! I forgot about the old reserve valve! Been a few years since I had the Ninja 250.

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Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
Ecodriving test: Manual vs. automatic transmission MPG showdown



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www.MetroMPG.com - fuel efficiency info for Geo Metro owners
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