Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Vapor pressure
Patent
1974-10-07
1976-04-27
Gill, James J.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Vapor pressure
73 676, G01N 3316
Patent
active
039525783
ABSTRACT:
An apparatus for time delay acoustic spectrographic analysis of fluid composition uses frequency modulated ultrasonic vibrations which are transmitted through the fluid from a sending transducer to a receiving transducer. By scanning the frequency of the modulated vibrations at a sufficiently high rate, standing waves which give erroneous indications of fluid component concentrations, are eliminated. The frequency of the signal at the sending transducer is compared with that at the receiving transducer and a comparing means whose output is related to the frequency difference of the signal at the receiving transducer from the sending transducer measures the number of times this signal shifts 360.degree. during a scanning period. This measurement is directly related to a property of the fluid being measured. The method and apparatus have particular application in the investigation of coagulation in human blood.
REFERENCES:
patent: 3392574 (1968-07-01), Lemon et al.
patent: 3568661 (1971-03-01), Franklin
patent: 3587295 (1971-06-01), Simons
Gill James J.
The United States of America as represented by the Secretary of
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