2016 CAP Congress / Congrès de l'ACP 2016

Contactless Real-time Dynamic Measurements with THz waves and a Rotary Delay Line

14 Jun 2016, 09:00

15m

SITE J0106 (University of Ottawa)

Oral (Student, Not in Competition) / Orale (Étudiant(e), pas dans la compétition) Industrial and Applied Physics / Physique industrielle et appliquée (DIAP-DPIA) T1-7 Mass spectrometry in nuclear waste management and control at the border (DIAP-DIMP) / Spectrométrie de masse dans la gestion des déchets nucléaires et surveillance à la frontière (DPIA-DPIM)

Speaker

Hichem Guerboukha (École Polytechnique de Montréal)

Description

For several years, THz spectroscopy and imaging have been applied to many different fields. However, some burdens still remain in its commercial generalization, particularly for the industry sector. One of these difficulties lies in the acquisition time. In a typical THz time-domain spectroscopy system (THz-TDS), the THz pulse is sampled in time by the means of a micrometer linear delay line. This operation is highly time-consuming, often on the minute scale. We design and fabricate a fast rotary optical delay line (FRODL) consisting of two curvilinear reflectors directly connected to a rotating motor. The optical delay is linear with the rotation angle of the FRODL. The optical input and output are separate and stable to avoid the use of other moving components. We present an experimental implementation of such FRODL. The FRODL surface is made with a CNC machine. We fabricated four blades on the same disk to increase by four the total scan rate. We tested the FRLODL with speeds up to 48 Hz (192 Hz maximum). The total delay was experimentally evaluated to 100 ps. As a first application, we present contactless monitoring of spray painting process and thickness real-time evaluation of the thickness of the paint layer. As a second application, we present the simultaneous detection and thickness characterization of fast moving objects.