Optical digitizer for measuring spirometer output

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

1980-01-03

1981-12-29

Cohen, Lee S.

Surgery

Truss

Pad

73239, A61B 508

Patent

active

043077293

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 offset 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.degree. from one another as the columns pass through their respective fields of view. The signals are continuously sampled as digital words and consecutive words are compared to determine whether a counter should be incremented or decremented by one or two counts.

REFERENCES:
patent: 3217539 (1965-11-01), Owen et al.
patent: 3680378 (1972-08-01), Aurilio et al.
patent: 3922525 (1975-11-01), Kozak et al.
patent: 3985124 (1976-10-01), Coleman
Teodorescu, "Optoelectronic . . . Sensor for Medical Use", Electronic Engineering, Jun. 1977, p. 29.

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