Temperature measurement in a turbine stator assembly using an integratable high-temperature ultrasonic sensor network

Kuo-Ting Wu; Zhigang Sun; Makiko Kobayashi; Brian Galeote; Nezih Mrad

doi:10.1117/12.880522

27 April 2011 Temperature measurement in a turbine stator assembly using an integratable high-temperature ultrasonic sensor network

Kuo-Ting Wu, Zhigang Sun, Makiko Kobayashi, Brian Galeote, Nezih Mrad

Author Affiliations +

Proceedings Volume 7979, Industrial and Commercial Applications of Smart Structures Technologies 2011; 797902 (2011) https://doi.org/10.1117/12.880522
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

Abstract

Implementation of an integratable ultrasonic sensor network with associated cable connection for high temperature monitoring applications is demonstrated through application of a three-element ultrasonic sensor network for temperature measurement in a turbine stator assembly. The sensor network is composed of a piezoelectric composite film deposited on a titanium substrate with a sol-gel technique and three top electrodes deposited on the piezoelectric film. The sensor network is glued onto a selected area of the stator assembly in such a way that three subareas with different wall thicknesses are probed individually by each of the sensing elements. The ultrasonically instrumented stator assembly is first heated in a furnace to different temperatures. At each temperature and for each probed location the transit time of ultrasonic waves through assembly wall thickness is measured. Then a relationship between transit time and wall temperature is established. In a subsequent experiment, the stator assembly is heated up to 200 °C and then let cool down while the transit time in the assembly wall is being measured continuously. By using the transit time versus temperature relationship obtained earlier, the heating and cooling rates at the three probed locations are determined and then compared.

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Kuo-Ting Wu, Zhigang Sun, Makiko Kobayashi, Brian Galeote, and Nezih Mrad "Temperature measurement in a turbine stator assembly using an integratable high-temperature ultrasonic sensor network", Proc. SPIE 7979, Industrial and Commercial Applications of Smart Structures Technologies 2011, 797902 (27 April 2011); https://doi.org/10.1117/12.880522

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KEYWORDS

Temperature metrology

Transducers

Ultrasonics

Sensor networks

Ferroelectric materials

Ultrasonography

Electrodes

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