Research Papers

Trial for Monitoring the Water Temperature Utilizing the Frequency Dependence of Reflection Coefficient of Ultrasound Passing Through Thin Layer

[+] Author and Article Information
Hironori Tohmyoh

Department of Finemechanics,
Tohoku University,
Aoba 6-6-01, Aramaki, Aoba-ku,
Sendai 980-8579, Japan
e-mail: tohmyoh@ism.mech.tohoku.ac.jp

Shu Terashima

Department of Finemechanics,
Tohoku University,
Aoba 6-6-01, Aramaki, Aoba-ku,
Sendai 980-8579, Japan

1Corresponding author.

Manuscript received August 13, 2018; final manuscript received February 9, 2019; published online March 25, 2019. Assoc. Editor: Fabrizio Ricci.

ASME J Nondestructive Evaluation 2(2), 021001 (Mar 25, 2019) (6 pages) Paper No: NDE-18-1030; doi: 10.1115/1.4042871 History: Received August 13, 2018; Accepted February 12, 2019

This paper describes a new concept to monitor the temperature of water utilizing the acoustic resonance, which occurs when ultrasound passes through a thin layer. In the ultrasonic transmission system that comprises of the reflection plate, thin film, and water, the reflection coefficient of the ultrasound at the plate/film/water interface depends on the frequency and takes its minimum value at the resonant frequency. Notably, this is closely related to the acoustic impedance of the water; moreover, it is a known fact that the acoustic impedance of the water demonstrates temperature dependence. Against this background, the present study aims to develop a technique in order to monitor the temperature of water utilizing the aforementioned correlation between the reflection coefficient and water temperature. First, a theoretical model was developed to determine the acoustic impedance of water from the difference in the amplitude spectra of echoes reflected at the back of the plate in the cases both with and without the film. It was found that the ratio of the amplitude spectrum of the echo recorded in the case with the film to that in the case without the film clearly decreased with a drop in water temperature. From this, we obtained the equation for determining water temperature experimentally. Finally, the temperature of water, which was brought down by air or ice cooling, was monitored by the proposed method. It was found that the behavior of temperature determined by the proposed method was congruent with that which was measured by a thermocouple.

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Fig. 7

Temperature profile measured by a thermocouple

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Fig. 5

(a) γR versus T and (b) ZW versus T

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Fig. 4

Experimental results. Examples of the waveforms obtained both without and with thin film. The waveform without the film was obtained at 25.7 °C, and the waveforms with the film were recorded at 9.0, 18.3, and 30.1 °C, respectively. (b)–(d) The amplitude spectra in the cases without (φ0) and with the film (φ1) at 9.0, 18.3, and 30.1 °C, respectively. Here, φ0 shown in (b)–(d) was the same and obtained at 25.7 °C. (e) γ versus f.

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Fig. 3

Experimental setup

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Fig. 2

Two models for ultrasonic transmission system (a) without and (b) with thin film between the reflection plate and water

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Fig. 1

Changes in the acoustic properties of water: (a) CW and ρW against T and (b) ZW and dZW/dT against T

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Fig. 8

Experimental results of monitoring water temperature. (a) Examples of the waveforms obtained without and with the film at the points m1 to m3 are indicated in Fig. 7. The values of φ1 obtained at m1 to m3 are shown in (b)–(d) along with φ0. (e) γ versus f.

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Fig. 9

(a) The values of γR are plotted as a function of tC (scale for ΓR is also shown), (b) Behavior of TU against tC together with that of TT, and (c) TU versus TT

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Fig. 10

Experimental results for measuring the acoustic impedance of thin film: (a) Waveforms obtained without and with thin film, (b) φ0, φ1 versus f, and (c) γ versus f

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Fig. 11

Comparison of ZW determined by two ways: (a) γR versus T and (b) ZW versus T



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