Technical Briefs

Laser Based Calibration Technique of Thin Film Gauges for Short Duration Transient Measurements

[+] Author and Article Information
Rakesh Kumar, Niranjan Sahoo, Vinayak Kulkarni, Anugrah Singh

Research Scholare-mail: krakesh@iitg.ernet.inAssociate Professore-mail: shock@iitg.ernet.inAssistant Professore-mail: vinayak@iitg.ernet.in Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, IndiaAssociate Professore-mail: anugrah@iitg.ernet.in Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, India

J. Thermal Sci. Eng. Appl 3(4), 044504 (Oct 24, 2011) (6 pages) doi:10.1115/1.4005075 History: Published October 24, 2011; Online October 24, 2011

Surface temperature history and determination of convective heating rate are the important activity in many research programs for devising an effective cooling system in internal combustion engines or for typical high speed aerodynamic reentry vehicles. Thin film sensors have high response time (∼ few microseconds) and are invariantly used for these applications due to their precision measurement. Moreover, they can be fabricated in-house and thus cost effective. Present investigations are focused on the fabrication of such sensors and establishment of an experimental setup for calibration. Thin film sensors are prepared in-house by platinum ink mounted on an insulated substrate (Pyrex). Experiments are carried out by applying step heat load on the thin film sensor using laser light of known wattage. Recorded transient temperature data are processed for estimation of laser wattage using numerical and analytical models. For the known heating load, temperature signal is also predicted using one-dimensional transient heat conduction solver using ansys . Encouraging agreement of these predictions has demonstrated the success of the designed calibration set up and cost-effective means of in-house fabrication of thin film sensors.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Photograph of a platinum thin film sensor

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Figure 2

Schematic diagram of oil bath method to determine TCR

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Figure 3

Variation of voltage with temperature during heating and cooling process in oil-bath experiments

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Figure 4

Schematic diagram of laser based experimental setup for calibration of platinum thin film gauge

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Figure 5

Geometric configuration of the platinum film mounted on a Pyrex substrate

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Figure 6

Platinum film mounted on a Pyrex substrate modeled in ansys : (a) computational model of TFG; (b) finite element meshing of TFG; and (c) vertically enlarged view to show the interface region

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Figure 7

Comparison of temperature history for various step heat loads: (a) 30 kW/m2 ; (b) 35 kW/m2 ; (c) 40 kW/m2 ; and (d) 45 kW/m2

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Figure 8

Comparison of transient surface heat flux for various step heat loads: (a) 30 kW/m2 ; (b) 35 kW/m2 ; (c) 40 kW/m2 ; and (d) 45 kW/m2



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