Two-band optical comparator for use with chopped cw singlet...

Details Two-band optical comparator for use with chopped cw singlet... Two-band optical comparator for use with chopped cw singlet...

A - Human Necessities

61

B

73/51.5

A61B 6/00 (2006.01) A61N 5/00 (2006.01)

Patent

CA 1306877

ABSTRACT An improved apparatus and method for detecting singlet oxygen emission produced during photoradiation is disclosed. The invention utilizes a two-band optical comparator to detect optical emissions. The optical comparator comprises an in-band filter that passes light in the 1270 nm singlet oxygen emission band and an out-of-band filter that passes light outside of the 1270 nm singlet oxygen emission band. The signal detected when the out-of-band filter is used is composed essentially of a fluorescence emission. This detected signal is used to synchro- nize an electronic reference signal. The electronic reference signal is used by a signal processing means to isolate a phase delayed singlet oxygen emission component which appears with a fluorescence emission component in the 1270 nm singlet oxygen emission band.

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