Terahertz time-domain spectroscopic imaging of diverse shale

Qian Xu; Jia-lu Gu; Yu-tong Ma; Hao-chong Huang; Hua Gao; Zi-li Zhang; Zhi-yuan Zheng

doi:10.1117/12.2580469

7 October 2020 Terahertz time-domain spectroscopic imaging of diverse shale

Qian Xu, Jia-lu Gu, Yu-tong Ma, Hao-chong Huang, Hua Gao, Zi-li Zhang, Zhi-yuan Zheng

Proceedings Volume 11571, Optics Frontier Online 2020: Optics Imaging and Display; 115710X (2020) https://doi.org/10.1117/12.2580469
Event: Optics Frontiers Online 2020: Optics Imaging and Display (OFO-1), 2020, Shanghai, China

Abstract

Using terahertz time-domain spectroscopy (THz-TDS) to characterize the shale is significant for geological research. This paper adopts the transmission THz-TDS system which is composed of a femtosecond laser, terahertz radiation generation device, corresponding detection device, and time delay control system. It can also further explore the application potential of THz-TDS in rock mineralogy. The method of shale powder tablet is used to make sample suitable for test and confirm the appropriate proportion that the shale mixed with PTFE under the condition of THz-TDS. Matlab software is used to extract the phase shift and amplitude curve of the sample, and then the refractive index and absorption coefficient of the sample are extracted from the time domain data. In addition, it is feasible to use the characteristic peak in the absorption coefficient to identify minerals in similar shales. The mineral composition of shales which cannot be directly determined by THz-TDS is determined by X-ray fluorescence (XRF) and X-ray diffraction (XRD). The experimental results show that the refractive index can be used to distinguish two kinds of similar black shales: oil shale which is rich in organic matter and ordinary shale. THz-TDS can be used as a supplement to traditional testing methods, which provide a new method for the study of the rock mineralogical characteristics of shale and make the characterization system of shale more perfect.

Citation Download Citation

Qian Xu, Jia-lu Gu, Yu-tong Ma, Hao-chong Huang, Hua Gao, Zi-li Zhang, and Zhi-yuan Zheng "Terahertz time-domain spectroscopic imaging of diverse shale", Proc. SPIE 11571, Optics Frontier Online 2020: Optics Imaging and Display, 115710X (7 October 2020); https://doi.org/10.1117/12.2580469

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available