Portable meter to measure chlorophyll, nitrogen and water...

Details Portable meter to measure chlorophyll, nitrogen and water... Portable meter to measure chlorophyll, nitrogen and water...

2006-11-21

2010-06-29

Evans, F. L (Department: 2877)

Optics: measuring and testing

Plural test

C356S051000, C356S420000

Reexamination Certificate

active

07746452

ABSTRACT:
Methods for determining chlorophyll content comprise providing a sample, subjecting the sample to light at a first wavelength and detecting a first wavelength response, subjecting the sample to light at a second wavelength and detecting a second wavelength response, and calculating a chlorophyll content of the sample based on at least the first wavelength response and the second wavelength response. Optional approaches include detecting the nitrogen content and/or water content of the sample. Associated apparatus for determining chlorophyll content, which may comprise a handheld device, is also disclosed.

REFERENCES:
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patent: 5296702 (1994-03-01), Beck et al.
patent: 5424840 (1995-06-01), Moore et al.
patent: 6020587 (2000-02-01), Spiering et al.
patent: 2002/0011567 (2002-01-01), Ozanich
patent: 2000-88747 (2000-03-01), None
International Search Report and Written Opinion for PCT/US2006/045350, filed Nov. 21, 2006 (mailed Jul. 31, 2007).

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