Title:
APPARATUS FOR GENERATING ELECTRIC SIGNAL IN PRORTION TO LUG CAPACITY MEASURED BY LUG CAPACITY METER
Document Type and Number:
Japanese Patent JPS56151022
Kind Code:
A
Abstract:
In a spirometer including an expansible chamber (22) of the piston type there is provided an arrangement for producing an electrical signal which is related to the volume of the chamber (22), said arrangement comprising: an indicia strip (82) associated with the piston (14) of the chamber (22) and including two columns (76, 78) of alternating light and dark bars, the columns (76, 78) being offset from one another by one-half the thickness of a bar; and two photodetectors (72, 74) associated with a fixed member (70) of the spirometer and arranged to respectively observe the columns (76, 78), the photodetectors (72, 74) generating signals which are shifted 90 DEG from one another as the columns (76, 78) pass through their respective field of view and which are continuously sampled as digital words, the consecutive words being compared and the comparison result processed to produce said electrical signal.
Inventors:
RATSUSERU FURANKU HAATO
JIYOAN MARII GURUSU
JIERARUDO AANORUDO PURAMU
JIYOAN MARII GURUSU
JIERARUDO AANORUDO PURAMU
Application Number:
JP25681A
Publication Date:
November 21, 1981
Filing Date:
January 05, 1981
Export Citation:
Assignee:
BENDIX CORP
International Classes:
A61B5/08; A61B5/093; G01D5/36; G01D9/22; G01F17/00; (IPC1-7): A61B5/08