Thermoelastic stress analysis by means of an infrared scanner and a two-dimensional fast Fourier transform-based lock-in technique

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Abstract

An infrared thermographic experimental set-up has been proposed and evaluated towards the capability to measure thermoelastic-effect-induced temperature changes. A standard infrared thermocamera with a nominal noise-equivalent temperature difference (NETD) resolution of 0.12 K has been employed to measure the temperature from unidirectional glass-reinforced plastic tensile coupons under cyclic sinusoidal loads. The raster scanning mode of the camera single detector produces a time delay in acquiring the signal from two succeeding pixels on the same row, and from consecutive scanned rows. By exploiting the acquired dwell times, it was possible to produce a periodic pattern on the thermal maps, caused by and correlated with the thermoelastic-effect-induced temperature changes. The acquired raw data have then been post-processed with a lock-in algorithm implemented in MATLAB® and based on a two-dimensional fast Fourier transform analysis. The filtered thermoelastic component from the lock-in analysis showed good linearity with the load applied, up to values of the temperature change one order of magnitude lower than the NETD resolution limits of the thermocamera. In the light of this the present experimental setup and processing methodology can be proposed as a potential low-cost tool for thermoelastic stress analysis investigations.
Lingua originaleEnglish
pagine (da-a)493-506
RivistaJournal of Strain Analysis for Engineering Design
Volume43-6
Stato di pubblicazionePublished - 2008

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Stress Analysis
Thermoelastic
Fast Fourier transform
Scanner
Stress analysis
Fast Fourier transforms
Infrared
Infrared radiation
Temperature
Dwell Time
Reinforced plastics
Cyclic loads
Linearity
MATLAB
Categorical or nominal
Consecutive
Scanning
Plastics
Time Delay
Time delay

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Applied Mathematics
  • Mechanical Engineering
  • Mechanics of Materials

Cita questo

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title = "Thermoelastic stress analysis by means of an infrared scanner and a two-dimensional fast Fourier transform-based lock-in technique",
abstract = "An infrared thermographic experimental set-up has been proposed and evaluated towards the capability to measure thermoelastic-effect-induced temperature changes. A standard infrared thermocamera with a nominal noise-equivalent temperature difference (NETD) resolution of 0.12 K has been employed to measure the temperature from unidirectional glass-reinforced plastic tensile coupons under cyclic sinusoidal loads. The raster scanning mode of the camera single detector produces a time delay in acquiring the signal from two succeeding pixels on the same row, and from consecutive scanned rows. By exploiting the acquired dwell times, it was possible to produce a periodic pattern on the thermal maps, caused by and correlated with the thermoelastic-effect-induced temperature changes. The acquired raw data have then been post-processed with a lock-in algorithm implemented in MATLAB{\circledR} and based on a two-dimensional fast Fourier transform analysis. The filtered thermoelastic component from the lock-in analysis showed good linearity with the load applied, up to values of the temperature change one order of magnitude lower than the NETD resolution limits of the thermocamera. In the light of this the present experimental setup and processing methodology can be proposed as a potential low-cost tool for thermoelastic stress analysis investigations.",
author = "Leonardo D'Acquisto and Giuseppe Pitarresi and Siddiolo, {Antonino Marco} and Siddiolo",
year = "2008",
language = "English",
volume = "43-6",
pages = "493--506",
journal = "Journal of Strain Analysis for Engineering Design",
issn = "0309-3247",
publisher = "SAGE Publications Ltd",

}

TY - JOUR

T1 - Thermoelastic stress analysis by means of an infrared scanner and a two-dimensional fast Fourier transform-based lock-in technique

AU - D'Acquisto, Leonardo

AU - Pitarresi, Giuseppe

AU - Siddiolo, Antonino Marco

AU - Siddiolo, null

PY - 2008

Y1 - 2008

N2 - An infrared thermographic experimental set-up has been proposed and evaluated towards the capability to measure thermoelastic-effect-induced temperature changes. A standard infrared thermocamera with a nominal noise-equivalent temperature difference (NETD) resolution of 0.12 K has been employed to measure the temperature from unidirectional glass-reinforced plastic tensile coupons under cyclic sinusoidal loads. The raster scanning mode of the camera single detector produces a time delay in acquiring the signal from two succeeding pixels on the same row, and from consecutive scanned rows. By exploiting the acquired dwell times, it was possible to produce a periodic pattern on the thermal maps, caused by and correlated with the thermoelastic-effect-induced temperature changes. The acquired raw data have then been post-processed with a lock-in algorithm implemented in MATLAB® and based on a two-dimensional fast Fourier transform analysis. The filtered thermoelastic component from the lock-in analysis showed good linearity with the load applied, up to values of the temperature change one order of magnitude lower than the NETD resolution limits of the thermocamera. In the light of this the present experimental setup and processing methodology can be proposed as a potential low-cost tool for thermoelastic stress analysis investigations.

AB - An infrared thermographic experimental set-up has been proposed and evaluated towards the capability to measure thermoelastic-effect-induced temperature changes. A standard infrared thermocamera with a nominal noise-equivalent temperature difference (NETD) resolution of 0.12 K has been employed to measure the temperature from unidirectional glass-reinforced plastic tensile coupons under cyclic sinusoidal loads. The raster scanning mode of the camera single detector produces a time delay in acquiring the signal from two succeeding pixels on the same row, and from consecutive scanned rows. By exploiting the acquired dwell times, it was possible to produce a periodic pattern on the thermal maps, caused by and correlated with the thermoelastic-effect-induced temperature changes. The acquired raw data have then been post-processed with a lock-in algorithm implemented in MATLAB® and based on a two-dimensional fast Fourier transform analysis. The filtered thermoelastic component from the lock-in analysis showed good linearity with the load applied, up to values of the temperature change one order of magnitude lower than the NETD resolution limits of the thermocamera. In the light of this the present experimental setup and processing methodology can be proposed as a potential low-cost tool for thermoelastic stress analysis investigations.

UR - http://hdl.handle.net/10447/34765

M3 - Article

VL - 43-6

SP - 493

EP - 506

JO - Journal of Strain Analysis for Engineering Design

JF - Journal of Strain Analysis for Engineering Design

SN - 0309-3247

ER -