Measuring and testing – Volume or rate of flow – Of selected fluid mixture component
Patent
1984-11-27
1986-04-15
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Of selected fluid mixture component
7386128, 128719, G01F 166, G01F 174
Patent
active
045819424
ABSTRACT:
A measuring conduit adapted for flow rate and concentration of a fluid for use in a measuring apparatus which measures both the flow rate of the fluid such as a respiratory gas containing a particular gas component, for example, carbon dioxide, using an ultrasonic wave and the concentration of the particular gas component in an optical manner. In order to simultaneously measure the flow rate and concentration and also to reduce the dead space of the measuring conduit, this measuring conduit comprises a single conduit member through which the fluid flows; a pair of ultrasonic transducers attached to the conduit member so as to face each other along a line slanted with respect to a flow direction of the fluid; and a pair of light transmitting windows airtightly provided in the wall of the conduit member between the ultrasonic transducers so as to face each other. One of the light transmitting windows introduces a light beam from an external light source into the conduit member. The other light transmitting window introduces the light penetrating the fluid flowing through the conduit member into a photo detecting element of the measuring apparatus.
REFERENCES:
patent: 3901078 (1975-08-01), McShane
patent: 3906791 (1975-09-01), Lynnworth
patent: 4425805 (1984-01-01), Ogura
patent: 4522204 (1985-06-01), Kurahashi et al.
Kurahashi Muneshige
Machida Kaoru
Ogura Ichiro
Goldstein Herbert
Kabushiki Kaisha Toshiba
Nihon Kohden Corporation
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