The feasibility of THz -Spectroscopy for identifying petroleum products and monitoring oil degradation in the spectral range of 40-600 cm−1 was investigated. Petroleum samples of commercial gasoline, diesel and lubricating oil identified at frequencies 464 cm−1, 475 cm−1 and 449 cm−1 respectively. Furthermore, characteristic frequency of aromatic compounds was revealed at 475, 464, 256, 146 cm−1.

© 2004 Optical Society of America

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