| 摘要 |
Pulses are applied to the upper end of an electrical transmission line sensor mounted in a fluid container or tank. Each pulse is reflected at the surface of the fluid, because of the change in dielectric constant which changes the characteristic impedance of the transmission line, and again at the lower end of the transmission line which is not terminated in its characteristic impedance. The volume of fluid in the tank is a function of time delay, t1, associated with the surface-reflected pulse. The density of the fluid is a function of time delay t1 and another time delay, t2-t1, associated with the pulse reflected from the lower end of the transmission line and with respect to the surface-reflected pulse. The weight of fluid in the tank is the product of the volume and density functions.
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