Torsional mode ultrasonic helical waveguide sensor for re-configurable temperature measurement
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TLDR
An ultrasonic torsional mode based technique, configured in the form of a helical “spring-like” waveguide, for multi-level temperature measurement is introduced in this article.Abstract:
This paper introduces an ultrasonic torsional mode based technique, configured in the form of a helical “spring-like” waveguide, for multi-level temperature measurement. The multiple sensing levels can be repositioned by stretching or collapsing the spring to provide simultaneous measurements at different desired spacing in a given area/volume. The transduction is performed using piezo-electric crystals that generate and receive T(0,1) mode in a pulse echo mode. The gage lengths and positions of measurements are based on machining multiple reflector notches in the waveguide at required positions. The time of fight (TOF) measurements between the reflected signals from the notches provide local temperatures that compare well with co-located thermocouples.read more
Citations
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Journal ArticleDOI
Ultrasonic bent waveguides approach for distributed temperature measurement.
TL;DR: Novel multiple bent waveguide method proposed to measure temperature in a chamber using two configurations of bent wires used with single transducer and electronics to improve upon the earlier reported studies using straight waveguides.
Analysis of helical waveguide
Saeyoung Ahn,A. K. Ganguly +1 more
TL;DR: In this article, the dispersion characteristics of the large-diameter helical waveguide are calculated using Pierce's small-signal theory, and the threshold interaction length for the onset of oscillation is also calculated.
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Ultrasonic Waveguide-Based Multi-Level Temperature Sensor for Confined Space Measurements
TL;DR: In this paper, an ultrasonic technique for accurate temperature measurement by tracking the time-of-flight of reflected guided wave modes from appropriately spaced notch reflectors is proposed, while using the reflection from a bend is used as a reference.
Journal ArticleDOI
Ultrasonic waveguide based level measurement using flexural mode F(1,1) in addition to the fundamental modes.
TL;DR: By monitoring all three wave modes simultaneously, a more versatile and redundancy in measurements of the fluid level inside critical enclosures of processing industries can be achieved by compensating for changes in the fluid temperature using one mode, while the level is measured using another.
Journal ArticleDOI
Multiple temperature sensors embedded in an ultrasonic “spiral-like” waveguide
TL;DR: In this article, the authors studied the propagation of ultrasound in spiral waveguides towards distributed temperature measurements on a plane, where the finite element (FE) approach was used for understanding the velocity behaviour and consequently designing the spiral waveguide.
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