<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
         <<  Lancair Builders' Mail List  >>
         <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>

From: n295vv

A reliable position sensor which could be used for multiple applications can be made from a paired uv emitter and uv collector.  Mount them adjacent and parallel to each other in two small holes drilled in phenolic or dark plastic.  Adjust them so they shine on a reflective surface that will bounce the emitted uv back to the collector when the position is right.  Chromed metal or Aluminized tape will do the job.  A shiny bolt head will even work.

The same uv collector sensor can detect a match flame from about 15 feet with the proper circuitry and could be  used to make a fire detection system for your engine.

I retired at age 45 as a result of designing a level sensing temperature control system for the semiconductor industry which used these tiny sensors.  They are very reliable and have a long life.

I want 5% if you make a lot of money from my suggestion.  Hehehe.

David Jones

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.