Abstract
study it is concluded that the envisioned optical LVDT is viable, rendering the idea worthy of consideration
| Original language | English |
|---|---|
| Journal | Journal of Materials in Civil Engineering |
| Number of pages | 11 |
| ISSN | 0899-1561 |
| DOIs | |
| Publication status | Published - 2016 |
| Externally published | Yes |
Keywords
- Asphalt Concrete
- Material Characterization
- Linear Variable Displacement Transducer (LVDT)
- Digital Image Correlation
- Precision and Accuracy
Cite this
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Development of an Optical Displacement Transducer for Routine Testing of Asphalt Concrete. / Hamam, Tomer; Levenberg, Eyal; Zelnik-Manor, Lihi.
In: Journal of Materials in Civil Engineering, 2016.Research output: Contribution to journal › Journal article › Research › peer-review
TY - JOUR
T1 - Development of an Optical Displacement Transducer for Routine Testing of Asphalt Concrete
AU - Hamam, Tomer
AU - Levenberg, Eyal
AU - Zelnik-Manor, Lihi
PY - 2016
Y1 - 2016
N2 - Routine mechanical characterization of asphalt concrete is performed under small-strain levels with on-specimen linear variable displacement transducers (LVDTs) as deformation measuring devices. An optical LVDT was conceptually proposed and evaluated in this study to serve as a viable noncontact alternative to physical LVDTs. The envisioned device consists of a pair of low-end low-resolution grayscale cameras, each monitoring a virtual gauge point, i.e., a small untreated surface area of the tested specimen. The gauge length is the distance between the two virtual gauge points, and the sought-after information is their differential in-plane translation. Digital image correlation techniques were employed for the measurement, operated on the natural material texture without requiring speckle coating. As a first step toward evaluating the concept, the study explored both the precision and the accuracy that may be achieved with one low-resolution image sensor. A calibration scheme was also offered for introducing object-scale dimensions into the analysis. From this predevelopmentstudy it is concluded that the envisioned optical LVDT is viable, rendering the idea worthy of consideration
AB - Routine mechanical characterization of asphalt concrete is performed under small-strain levels with on-specimen linear variable displacement transducers (LVDTs) as deformation measuring devices. An optical LVDT was conceptually proposed and evaluated in this study to serve as a viable noncontact alternative to physical LVDTs. The envisioned device consists of a pair of low-end low-resolution grayscale cameras, each monitoring a virtual gauge point, i.e., a small untreated surface area of the tested specimen. The gauge length is the distance between the two virtual gauge points, and the sought-after information is their differential in-plane translation. Digital image correlation techniques were employed for the measurement, operated on the natural material texture without requiring speckle coating. As a first step toward evaluating the concept, the study explored both the precision and the accuracy that may be achieved with one low-resolution image sensor. A calibration scheme was also offered for introducing object-scale dimensions into the analysis. From this predevelopmentstudy it is concluded that the envisioned optical LVDT is viable, rendering the idea worthy of consideration
KW - Asphalt Concrete
KW - Material Characterization
KW - Linear Variable Displacement Transducer (LVDT)
KW - Digital Image Correlation
KW - Precision and Accuracy
U2 - 10.1061/(ASCE)MT .1943-5533.0001570
DO - 10.1061/(ASCE)MT .1943-5533.0001570
M3 - Journal article
JO - Journal of Materials in Civil Engineering
JF - Journal of Materials in Civil Engineering
SN - 0899-1561
ER -