 

Due to the existence of multiple guided wave modes ultrasonic guided waves have vast advantages including remote measurements, structural health monitoring, material property measurements etc. Surface temperature mapping is crucial for control of an object of interest such as a  Furnace/Reactor Pipes carrying hot fluids, or a component that is under the temperature-dependent process. While the use of waveguides for distributed temperature measurement in air/fluid medium has been well documented in the literature, the attachment of this waveguide to any metallic component poses new challenges. These include the relationship between the local waveguide temperature and the temperature of the metal component being investigated, the leakage of the wave into the component being measure and its effect on the measurements. This paper studies the generation and propagation of guided ultrasound wave in strip waveguide for the distributed surface temperature measurement of a simulated metal component. A suitable ultrasound mode and frequency is selected based on the dispersion characteristics as well as the confinement of the wave within the waveguide (reduce the leakage). And for the designing of the waveguide and placement of the ultrasound-based sensors, Finite element methods is used. Sufficient numbers of notches (that act as sensors) are embedded inside the waveguide for surface temperature mapping of the metal plate. Time of Flight (ToF) obtained from the reflection of the embedded notch/sensor were used to estimate the local surface temperature of the metal component. For experiments, sensors are kept inside a standard high-temperature furnace and data are collected at the steady-state condition. A calibration chart is prepared for each ultrasound-based temperature sensor. Temperature values obtained from the sensor is compared with a standard Resistance Temperature Detector (RTD). This work proposes an ultrasound-based surface temperature sensor for components at elevated temperatures and is of interest in several applications in industries.

Keywords: Ultrasound Waveguide, Temperature Sensor, Non-Destructive Measurements


Surface Temperature Mapping of a Metal Plate Using Ultrasound Guided Wave Technique

No proceedings papers in 2020. Video only.

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