| 摘要 |
<p>Method and device for acoustic flow measurement for measurement of the flow velocity (v) of gases and/or of quantities derived from same. A long-wave sound is transmitted into the measurement pipe (10) and, by means of two sound detectors (14a, 14b) placed at a certain distance (L) from one another in connection with the measurement pipe (10), the sound signals that propagate in the gas flow downstream and/or upstream are detected, the flow velocity (v) of the gas that flows in the measurement pipe (10) being determined by means of correlation of said sound signals. A sound speed co(T) in a medium at rest, which sound speed has been standardized or will be standardized for a certain temperature, is stored in the memory (20M), and the flow velocity (v) and the other quantities that may be derived from same, if any, are computed, at least in situations of disturbance, by means of the detected downstream speed vd or of the detected upstream speed vu and by means of said sound speed at rest co(T) stored in the memory (20M).</p> |
