Document Type
Thesis
Date of Award
5-31-1992
Degree Name
Master of Science in Electrical Engineering - (M.S.)
Department
Electrical and Computer Engineering
First Advisor
Farhad Ansari
Second Advisor
Sol Rosenstark
Third Advisor
Edip Niver
Abstract
The principle of refraction and reflection of light in optical fibers is applied to detection of air bubbles in a previous thesis. In the earlier work, a microcomputer was employed in acquisition and processing of air bubble data. In the present thesis, an embedded controller system is interfaced and programmed in order to replace the microcomputer. In this way, the system can be more easily integrated into field construction operations. Reflected light intensity signals are detected and analyzed by a microcontroller. The entrained percentage of air in concrete is displayed immediately. The signal can be transferred through a UART (Universal Asynchronous Receiver Transmitter) to a master IBM compatible personal computer. Analysis of reflected light intensity produces a graphic measurement of the air content of fresh concrete.
Accuracy of the system is evaluated through extensive laboratory and field trials.
Recommended Citation
Zhang, Zhaowu, "An embedded controller-based fiber optic sensor for use in fresh concrete" (1992). Theses. 2404.
https://digitalcommons.njit.edu/theses/2404
