Measuring and testing – Volume or rate of flow – Thermal type
Patent
1977-06-23
1979-08-07
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
73205R, 73755, G01F 168
Patent
active
041633903
ABSTRACT:
In a spirometer, a breath transmission passage has first and second ends open to the atmosphere and a restriction between the first and second ends. An elongated conduit has a first port at one end, a second port at the other end, and a third port intermediate to the first and second ports to form a first flow measurement passage in the conduit between the first and third ports and a second flow measurement passage in the conduit between the second and third ports. The first end of the breath transmission passage at a point near the restriction is interconnected to the first port, and the second end of the breath transmission passage at a point near the restriction is interconnected to the second port. A source of bias gas is connected to the third port. The difference between the rate of gas flow through the first and second flow measurement passages responsive to inhalation from the exhalation to the breath transmission passage is sensed to provide a bipolar indication thereof. First and second hot wires are bent in half to extend side by side along the length of a cavity. At one end, the first and second hot wires are electrically connected to each other to form in effect a single hot wire equal in length to the first and second hot wires.
REFERENCES:
patent: 3312106 (1967-04-01), Davis
patent: 3452595 (1969-07-01), Auger
patent: 3691830 (1972-09-01), Tomota et al.
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