Embedded chemicals detection using multiple frequencies excitation

Yaohui Gao; Meng-Ku Chen; Chia-En Yang; Yun-Ching Chang; Jimmy Yao; Jiping Cheng; Stuart (Shizhuo) Yin

doi:10.1117/12.862147

18 August 2010 Embedded chemicals detection using multiple frequencies excitation

Yaohui Gao, Meng-Ku Chen, Chia-En Yang, Yun-Ching Chang, Jimmy Yao, Jiping Cheng, Stuart (Shizhuo) Yin

Proceedings Volume 7781, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications IV; 778114 (2010) https://doi.org/10.1117/12.862147
Event: SPIE Photonic Devices + Applications, 2010, San Diego, California, United States

Abstract

In this paper, recent works of buried chemical detection system by stimulating and enhancing spectroscopic signatures with multi-frequency excitations are discussed. In this detection system, those multiple excitations, including DC electric field, microwave, CO₂ laser illumination and infrared radiation, are utilized and each of them plays a unique role. The Microwave could effectively increase the buried chemicals' evaporation rate from the source. The gradient DC electric field, generated by a Van De Graaff generator, not only serves as a vapor accelerator for efficiently expediting the transportation process of the vapor release from the buried chemicals, but also acts as a vapor concentrator for increasing the chemical concentrations in the detection area, which enables the trace level chemical detection. Similarly, CO₂ laser illumination, which behaves as another type vapor accelerator, could also help to release the vapors adsorbed on the soil surface to the air rapidly. Finally, the stimulated and enhanced vapors released into the air are detected by the infrared (IR) spectroscopic fingerprints. Our theoretical and experimental results demonstrate that more than 20-fold increase of detection signal can be achieved by using those proposed technology.

Citation Download Citation

Yaohui Gao, Meng-Ku Chen, Chia-En Yang, Yun-Ching Chang, Jimmy Yao, Jiping Cheng, and Stuart (Shizhuo) Yin "Embedded chemicals detection using multiple frequencies excitation", Proc. SPIE 7781, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications IV, 778114 (18 August 2010); https://doi.org/10.1117/12.862147

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Microwave radiation

Absorption

Gas lasers

Infrared spectroscopy

Near infrared

Chemical detection

Spectroscopy

Show All Keywords

Keywords/Phrases

Search In:

Publication Years