公开(公告)号：US20060032295A1

公开(公告)日：2006-02-16

申请号：US11197780

申请日：2005-08-04

Applicant: Roger Hazelden ,  Kimberley Smith

Inventor： Roger Hazelden ,  Kimberley Smith

IPC: G01N11/00

CPC classification number: G01N29/348 ,  G01N11/16 ,  G01N29/036 ,  G01N29/2462 ,  G01N29/42 ,  G01N2291/0258 ,  G01N2291/02818 ,  G01N2291/0422 ,  G01N2291/0427

Abstract: An apparatus for measuring the viscosity and temperature of a fluid, for example an engine oil, comprises a transducer, which is arranged to vibrate when provided with a drive signal to produce an ultrasonic shear wave; an impedance matching layer that is inserted into the fluid and which couples at least a portion of the ultrasonic waves produced by the transducer into the fluid and from which at least a portion of the wave is reflected back to the transducer; a detector which is adapted to detect a measurement signal produced by the transducer when the reflected wave is incident upon the transducer; a control circuit which varies the frequency of the drive signal applied to the transducer and hence the frequency of the ultrasound signal; a processing means which determines the optimum frequency of the drive signal at which the measurement signal output from the transducer has its minimum amplitude; and a temperature determining means which estimates the temperature of the fluid as a function of the optimum frequency.

Abstract translation: 用于测量流体（例如发动机油）的粘度和温度的装置包括换能器，其被设置为当设置有驱动信号以产生超声剪切波时振动; 阻抗匹配层，其插入到所述流体中并且将由所述换能器产生的超声波的至少一部分耦合到所述流体中，并且所述至少一部分波被从所述流体反射回所述换能器; 检测器，其适于在所述反射波入射到所述换能器时检测由所述换能器产生的测量信号; 控制电路，其改变施加到换能器的驱动信号的频率，并因此改变超声信号的频率; 确定从换能器输出的测量信号具有其最小振幅的驱动信号的最佳频率的处理装置; 以及温度确定装置，其估计作为最佳频率的函数的流体的温度。