Portable electrometric apparatus for roadside analysis of automotive exhaust emission
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United States of America Patent
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Nov 3, 1998
Grant Date -
N/A
app pub date -
Jun 6, 1996
filing date -
Jun 16, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for instantaneously measuring the level of carbon dioxide (and other gases) in automotive combustion exhaust analysis is provided in the form of a portable battery driven roadside diagnostic instrument in which the CO.sub.2 level is measured by a calorimetric technique utilizing light as the energy source and a piezoelectric bimorph to vibrate a single fiber-optic element to multiplex between two fiber-optic receptors delivering the light to a measurement cell and a reference cell. The measurement cell comprises a salt of an acid-base indicator dye which provides proportional color change on contact with CO.sub.2. The dye is supported on a polymetric film in the cell.
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