DEVELOPMENT OF A FAR INFRARED FLEXIBLE RETROREFLECTOR

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Authors
  1. Fougeres, A.
  2. Belanger, B.
  3. Caron, S.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN);National Optics Inst, Ste-Foy QUE (CAN)
Abstract
The goal of this project was to investigate the possibility of producing flexible retroreflective prototypes made of high-density polyethylene (HDPE) to complement far infrared (FIR) active imagers used in search and rescue (SAR) operations by the Canadian Armed Forces. Prototypes based on solid corner cubes arranged in a two-dimensional array were produced in various kind of HDPEs using two common moulding techniques. Using injection moulding, we were able to get samples with a -2mm spacing while from some kind of roll and press technique (details not disclosed by the supplier) we obtained samples with a 200 mu m spacing. The roller technique gave partially coherent arrays at 10.6 mu m but the performances as a retroreflector are significantly reduced by diffraction effects. On the other hand, injection moulding yielded near-diffraction limited (factor < 2) but spatially incoherent arrays with limited usable range (less than 150m). When put to test on the terrain at DREV with an active FIR imaging system similar to those susceptible to be used in search and rescue missions, all the samples yielded only few tens of degrees of elevation in apparent temperature for ranges below 150m; clearly insufficient for immediate application in search and rescue operations. Efforts were put in trying to understand the origin of the FIR losses in HDPE and to identify avenues susceptible to improve the FIR performance of the material. TRUNCATED
Keywords
FIR;Retroreflectors;High Density Polyethylene (HDPE)
Report Number
DREV-CR-959 — Contract Report (Final)
Date of publication
01 Feb 1998
Number of Pages
40
DSTKIM No
98-00698
CANDIS No
507578
Format(s):
Hardcopy;Document Image stored on Optical Disk

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