Exploring Terahertz Waves for Submarine Cladding Non-Destructive Examination (NDE) – Tile Sealant Transmission Characterization, Instrument Field Housing Design/Prototype Option B: proof-of-concept concealed interface imaging

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Authors
  1. Reid, M.
  2. Kilcullen, P.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN);University of Northern BC, Prince George (BC), CAN
Abstract
A Brewster angle imaging system was developed for subsurface hull inspection using broad-band pulsed THz radiation using a Picometrix T-Ray 4000 system in a previous phase of this project. Additionally, a single frequency, reflection imaging prototype system was developed using a cw TeraSense sub-THz imaging camera for subsurface interface inspection. Both systems were previously used to look at the possibility of a submarine hull inspection application for water ingress below Sikaflex grout lines, as it was identified that the grout-lines held the only potential for thoughcladding hull inspection in the far-infrared. Additionally, the possibility of using microwave frequencies was studied by subcontracting microwave inspection to Spectrum NDT. It was identified that through-Sikaflex inspection was not possible at frequencies of potential transparency at frequencies in the far-infrared and below (below 2 THz). In order to generally explore the suitability for subsurface interface water ingress detection of the developed prototypes at all frequencies, the project was extended as per Option B, to demonstrate the potential of the envisioned systems to tackle the identified problem using an analogue sample as the cladding, to demonstrate the idea. As such, this report summarizes the potential for the envisioned application in the far infrared using (i) the pulsed THz Brewster angle imaging system developed in the previous phase, (ii) the cw TeraSense reflection imaging system pro
Keywords
Non-destructive testing/inspection;Submarine;Acoustic tile;Water detection
Report Number
DRDC-RDDC-2018-C200 — Contract Report
Date of publication
01 Feb 2019
Number of Pages
32
DSTKIM No
CA049173
CANDIS No
809810
Format(s):
Electronic Document(PDF)

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