Document Type
Thesis
Date of Award
1-31-1991
Degree Name
Master of Science in Electrical Engineering - (M.S.)
Department
Electrical and Computer Engineering
First Advisor
Farhad Ansari
Second Advisor
Gerald Martin Whitman
Third Advisor
Edip Niver
Abstract
This thesis describes a microcomputer-based measuring system using a laser diode source, a fiber optic sensor and a microcomputer DMA interface to test and analyze the entrained percentage of air in concrete.
The principle of refraction and reflection of light in optical fibers is applied to detection of air bubbles. Reflected light intensity signals are detected and transferred through a DMA interface to a laptop computer. Analysis of reflected light intensity produces a measurement of the air content of fresh concrete. Accuracy of the system is evaluated through extensive laboratory and field trials.
Recommended Citation
Chen, Qiyu, "A multimode index detecting sensor for use in plastic concrete" (1991). Theses. 2455.
https://digitalcommons.njit.edu/theses/2455
