Method and apparatus for determining kinematic viscosity through the transmission and reception of ultrasonic energy

摘要

An apparatus for determining a fluid's kinematic viscosity from ultrasonic energy that has passed through the fluid of unknown viscosity along an acoustic path of known length. A computer of the apparatus determines a characteristic frequency of a received electrical signal associated with the ultrasonic energy and measures the fluid's velocity of sound. The kinematic viscosity of the fluid is determined by the computer on a continuous basis based on the characteristic frequency and the sound velocity. A method for determining a fluid's kinematic viscosity.

主权项

1. An apparatus for determining a fluid's kinematic viscosity comprising:
a transmitter and a transmitting transducer capable of converting a single pulse from the transmitter into ultrasonic energy; a receiving transducer and an electronic amplifier which converts some of the ultrasonic energy that has passed through a fluid of unknown viscosity into an electrical signal, the ultrasonic energy created by the transmitting transducer follows an acoustic path which is made to pass through the fluid of unknown viscosity along a path of known length; and a computer which determines a characteristic frequency of a received electrical signal and measures a fluid's velocity of sound and which determines kinematic viscosity of the fluid on a continuous basis based on the characteristic frequency and the sound velocity, where the kinematic viscosity is formed from a fluid's bulk viscosity and shear viscosity.