Optical digitizer for measuring spirometer output

Details Optical digitizer for measuring spirometer output Optical digitizer for measuring spirometer output

A - Human Necessities

61

B

73/51

A61B 5/08 (2006.01) A61B 5/093 (2006.01) G01D 5/36 (2006.01) G01D 9/22 (2006.01) G01F 17/00 (2006.01)

Patent

CA 1137791

OPTICAL DIGITIZER FOR MEASURING SPIROMETER OUTPUT ABSTRACT A spirometer includes an expansible chamber of the piston type fitted with an indicia strip. The indicia comprise two columns of alternating light and dark bars. The columns are off- set from one another by one-half the thickness of a bar and are respectively viewed by two photodetectors which generate signals which are shifted 90° from one another as the columns pass through their respective fields of view. The signals are con- tinuously sampled as digital words and consecutive words are compared to determine whether a counter should be incremented or decremented by one or two counts.

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