Measuring and testing – Volume or rate of flow – With indirect temperature or density compensation
Patent
1990-09-24
1992-10-06
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
With indirect temperature or density compensation
7386127, G01F 166, G01F 186
Patent
active
051521741
ABSTRACT:
An acoustic signal is transmitted into a flowing gas (10). The velocities of propagation of the signal in two predetermined directions are measured, and combined with sensed gas pressure and the frequency of the acoustic signal to compute the mass flow rate of the gas. The velocities are preferably measured as analogous phase differences between the transmitted signal, and the signal as incident upon receivers (18,20) spaced from the signal transmitter (16) by predetermined distances in the predetermined directions. The phase differences are preferably sensed using at least one phase locked loop (44) which adjusts the signal frequency so that a predetermined phase difference is maintained between the transmitted signal and one of the received signals or a derivative thereof. The flow rate computation includes obtaining the speed of the acoustic signal (speed of sound) in the material and the velocity of movement of the gas from the sensed phase differences. The sensor may also be used to sense the velocity of movement of a liquid or solid, in which case the pressure measurement is unnecessary. The velocities may alternatively be measured as propagation times or wavelength shifts, rather than as phase differences. In addition, the temperature of the flow of a gas may be obtained by the same apparatus.
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