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Research Papers

Thin-Film Gauges Using Carbon Nanotubes as Composite Layers

[+] Author and Article Information
Shrutidhara Sarma

Department of Mechanical Engineering,
Indian Institute of Technology Guwahati,
Guwahati 781 039, India
e-mail: s.shrutidhara@iitg.ernet.in

Niranjan Sahoo

Professor
Department of Mechanical Engineering,
Indian Institute of Technology Guwahati,
Guwahati 781 039, India
e-mail: shock@iitg.ernet.in

Aynur Unal

Visiting Professor
Department of Mechanical Engineering,
Indian Institute of Technology Guwahati,
Guwahati 781 039, India
e-mail: aynurunal@iitg.ernet.in

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received August 22, 2015; final manuscript received May 25, 2016; published online July 29, 2016. Assoc. Editor: Irene Beyerlein.

J. Eng. Mater. Technol 138(4), 041014 (Jul 29, 2016) (8 pages) Paper No: MATS-15-1199; doi: 10.1115/1.4033909 History: Received August 22, 2015; Revised May 25, 2016

Measurement of transient temperature and heat flux has attained enormous importance with the recent advancement in technology. Certain situations demand transient measurements to be performed for extremely short durations (approximately few seconds) which in turn call for sensors capable of responding within microseconds or even less. Thin-film gauges (TFGs), a particular class of resistance temperature detectors (RTDs), are such kind of sensors which are suitable for above requirements due to their quick and precise measurements in transient environments. The present work aims at designing an in-house fabrication and calibration of fast response TFG prepared by depositing nanocarbon layer on silver films as a laminated composite topping to enhance thermal and electrical properties. A significant improvement in the thermal and electrical conductivity of the composite sensor is observed when compared to gauges made from pure metals.

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Figures

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Fig. 4

An oil-bath calibration experimental setup for determination of TCR

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Fig. 5

Static calibration curves through oil-bath calibration experiments: (a) pure silver gauge, (b) NC gauge, and (c) pure gold gauge

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Fig. 3

A typical TFG and its components

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Fig. 7

Schematic of the laser beam showing Gaussian distribution of input heat flux

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Fig. 6

The laser-based experimental setup for calibration of heat loads for TFGs

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Fig. 2

Schematic representation of a vacuum coating chamber

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Fig. 1

Laminated composite made of silver and CNT

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Fig. 8

Sample voltage signals obtained from all TFGs while exposed to impulse heat load (20 W) from laser source

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Fig. 9

Sample surface heat flux recovered from the temperature history of TFGs subjected to an impulse input of 20 W from a laser source: (a) Ag TFG, (b) NC TFG, (c) Au TFG, and (d) all three TFGs juxtaposed together

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