Method and apparatus for monitoring a gas or fine particles

Details Method and apparatus for monitoring a gas or fine particles Method and apparatus for monitoring a gas or fine particles

1994-02-28

1995-06-27

Warden, Robert J.

Chemistry: analytical and immunological testing

Optical result

With fluorescence or luminescence

436133, 422 8208, 73 2334, 738656, 2504591, G01N 2176, G01N 2100, G01N 1700

Patent

active

054279577

ABSTRACT:
A carbon dioxide gas is supplied to a living plant while it is illuminated with excitation light, and resulting fluorescence from the plant is detected. Then, a mixture of a carbon dioxide gas and a gas or fine particles to be monitored is supplied to the same living plant while it is illuminated with the excitation light, and resulting fluorescence from the plant is detected. Differences between temporal variations or wavelength characteristics of fluorescence intensities under the above two conditions are used to identify the gas or fine particles.

REFERENCES:
patent: 4768390 (1988-09-01), Baker et al.
patent: 5014225 (1991-05-01), Vidaver et al.
patent: 5130545 (1992-07-01), Lussier
patent: 5143853 (1992-09-01), Walt
Ireland et al, "The Relationship Between Carbon Dioxide Fixation and Chlorophyll A Fluorescence During Induction of Photosynthesis in Maize Leaves at Different Temperatures and Carbon Dioxide Concentrations", Planta, 160:550-558, 1984.
"Laser-induced fluorescence of green plants. 1: A technique for the remote detection of plant stress and species differentiation", E. W. Chappelle et al., Applied Optics, vol. 23, No. 1, Jan. 1984.

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