Development of a long wave infrared photonic Doppler velocimeter

G. Lefrère; J-M. Goujon; L. Poffo; P. Besnard; R. Le Page; Y. Barbarin

doi:10.1117/12.2679788

23 October 2023 Development of a long wave infrared photonic Doppler velocimeter

G. Lefrère, J-M. Goujon, L. Poffo, P. Besnard, R. Le Page, Y. Barbarin

Proceedings Volume 12737, Electro-Optical and Infrared Systems: Technology and Applications XX; 127370E (2023) https://doi.org/10.1117/12.2679788
Event: SPIE Security + Defence, 2023, Amsterdam, Netherlands

Abstract

Photonic Doppler Velocimetry (PDV) has become a gold standard technique in materials impact dynamic loading research offered by its high accuracy and resolution in determining the shock wave speed under extreme conditions (shock, explosion, high pressure, etc...). However, this technique is nowadays mostly restrained to surfaces velocities. On the opposite, Radio-Frequency systems may enhance penetration in specific materials, but at the expense of lower spatial and temporal resolutions. To reach adequate penetration depth at high-speed rate measurements, we propose an innovative long-wave (LWIR) infrared Doppler velocimeter architecture to measure shock waves inside a material, operating at a wavelength near 9.5 μm. The system is currently designed to measure velocities up to 4 km/s, with a 750 MHz bandwidth MCT photodetector. Moreover, the measurement is remotely done using a 300 μm diameter Hollow Core fiber with internal dielectric reflective layers. In order to optimize the signal penetration properties into different materials, a wide tunable quantum cascade infrared laser (IR-QCL) operating in the 8-12 μm region is used. As preliminary results, we present measurements at low-speed (<1 m/s) with different targets materials (copper, aluminum and diffuse reflector) in air and transparent medium, in which the sensitivity has been identified at 9.5 μm. Results show that, despite high attenuation components, the system is able to maintain a suitable fringe contrast to ensure the velocity measurement. Further investigation will concern high speed target measurement and wavelength penetration depth optimization for materials of interest.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

G. Lefrère, J-M. Goujon, L. Poffo, P. Besnard, R. Le Page, and Y. Barbarin "Development of a long wave infrared photonic Doppler velocimeter", Proc. SPIE 12737, Electro-Optical and Infrared Systems: Technology and Applications XX, 127370E (23 October 2023); https://doi.org/10.1117/12.2679788

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