High-resolution terahertz Doppler velocimetry based on frequency difference multiplication

Chang-Lin Sun; Zhao-Hui Zhai; Li-Guo Zhu

doi:10.1117/12.2575034

10 October 2020 High-resolution terahertz Doppler velocimetry based on frequency difference multiplication

Chang-Lin Sun, Zhao-Hui Zhai, Li-Guo Zhu

Proceedings Volume 11559, Infrared, Millimeter-Wave, and Terahertz Technologies VII; 115590X (2020) https://doi.org/10.1117/12.2575034
Event: SPIE/COS Photonics Asia, 2020, Online Only

Conference Poster

Abstract

The frequency range of the terahertz wave makes it have partial characteristics both of microwave and light waves. This also makes the terahertz wave has the advantages of strong penetrability and small influence on the detected object when applied in the field of velocity measurement compared with other non-contact velocity measurement technologies. We designed and built a non-invasive, high-precision, free-space terahertz wave Doppler velocimetry (TDV) , and amplified the Doppler frequency difference to solve the problems such as incomplete terahertz wave interference fringes and low velocity resolution due to the long wavelength of terahertz when TDV applied in the diagnosis of detonation process and other instant process with high acceleration. Combined with the velocity measurement model introduced by our optical system and terahertz interference velocity measurement method, we used high-resolution TDV to measure the flying process of flyerplate. Then we completed the extraction of flyerplate velocity and displacement at velocity up to 1.2 km/s, and proved the high velocity resolution of measurement results. The terahertz Doppler velocimetry combined with the frequency difference multiplication provides a non-destructive, non-contact, high-resolution measurement method for the research of detonation and shock wave physics, internal vibration detection of large equipment, and many other fields.

Citation Download Citation

Chang-Lin Sun, Zhao-Hui Zhai, and Li-Guo Zhu "High-resolution terahertz Doppler velocimetry based on frequency difference multiplication", Proc. SPIE 11559, Infrared, Millimeter-Wave, and Terahertz Technologies VII, 115590X (10 October 2020); https://doi.org/10.1117/12.2575034

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