Detection device and method of liquid viscosity coefficient based on ultrasonic guided wave

Abstract

The invention relates to liquid viscosity coefficient determination, and belongs to the field of ultrasonic nondestructive detection. The detection device of the detection method comprises a metal feeler lever, a magnetostrictive transducer, and a comprehensive function module, wherein the metal feeler lever and the magnetostrictive transducer are mounted and manufactured as a hardware core part of the device. Because the transducer can excite ultrasonic guided waves in a torsional modal in the feeler lever, when the feeler lever is soaked into liquid with different viscosity coefficients, the energy attenuation coefficients of the guided waves propagated along the feeler lever are different. Therefore, through the measurement of the energy attenuation coefficients of the guided waves under different conditions, the liquid viscosity coefficients can be reflected. A ratio of an end face echo amplitude when the feeler lever is soaked into different liquids to an end face echo amplitude in the air is defined as a relative reflection coefficient RF, and a relation formula and a correction formula are established between the viscosity coefficient and parameters such as the relative reflection coefficient, frequency, temperature, and the like; and thus the liquid viscosity coefficient is calculated. The advantages of the invention are that the detection method is simple for implementation, and the used detection system can realize on-line detection.

Description

technical field [0001] The patent of the invention relates to the measurement of the viscosity coefficient of liquid, which belongs to the field of ultrasonic non-destructive testing. Specifically, it is a method of using a magnetostrictive sensor to excite torsional mode ultrasonic guided waves in a metal probe rod. The relationship between the energy reflection coefficient and the viscosity coefficient of the liquid, and the detection device and method for realizing the measurement of the viscosity coefficient of the liquid. Background technique [0002] Viscosity coefficient is an important physical quantity to characterize the properties of liquid, and the measurement of liquid viscosity coefficient is of great significance in various practical projects. For example, in hydraulic and thermal engineering, due to the viscoelasticity of the fluid, the energy consumption of the fluid during long-distance transportation in the pipeline; in the machinery industry, the selectio...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of off-line detection, poor environmental adaptability, and cumbersome experimental operations of the existing liquid viscosity detection method, and propose a simple and easy-to-operate online liquid viscosity measurement device and method based on ultrasonic guided waves

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