Studies on Forming Anti-icing Railroad Traffic Signal Lens by Using Femtosecond Laser Surface Processing Directly (FLSP) or by Stamping Tungsten Carbide FLSP Surfaces Into Railroad Lens Materials

Alexander, Dennis R; Shield, Jeffrey; Zuhlke, Craig; Song, Yingxiao; Ediger, Aaron; University of Nebraska--Lincoln; Nebraska Transportation Center

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ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.

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Studies on Forming Anti-icing Railroad Traffic Signal Lens by Using Femtosecond Laser Surface Processing Directly (FLSP) or by Stamping Tungsten Carbide FLSP Surfaces Into Railroad Lens Materials

2018-08-01
By Alexander, Dennis R ; Shield, Jeffrey ; Zuhlke, Craig ; ...

[PDF-3.60 MB]

English

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Creators:

Alexander, Dennis R ; Shield, Jeffrey ; Zuhlke, Craig ; Song, Yingxiao ; Ediger, Aaron

Alexander, Dennis R ; Shield, Jeffrey ; Zuhlke, Craig ; Song, Yingxiao ; Ediger, Aaron Less -
Corporate Creators:

University of Nebraska--Lincoln ; Nebraska Transportation Center

University of Nebraska--Lincoln ; Nebraska Transportation Center Less -
Corporate Contributors:

United States. Department of Transportation. University Transportation Centers (UTC) Program ; University of Texas Rio Grande Valley ; University Transportation Center for Railway Safety (UTCRS) [UTC]

United States. Department of Transportation. University Transportation Centers (UTC) Program ; University of Texas Rio Grande Valley ; University Transportation Center for Railway Safety (UTCRS) [UTC] Less -
Subject/TRT Terms:

[+]

Anti-icing Carbides Laboratory Tests Lasers Lenses (Optics) Light Emitting Diodes Nanotechnology Railroads Railroad Signals Roughness Texture
Publication/ Report Number:

26-1121-0018-008
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final Report (Oct. 2016 to August 2018)
Corporate Publisher:

University of Nebraska-Lincoln. University Transportation Center for Railway Safety
Abstract:

During winter weather conditions snow and ice can accumulate on railroad traffic signal lenses especially when high efficiency light emitting diodes are used as the light source making them hazardous as signals for the engineers. Railroad signal lens polycarbonate (PC) was functionalized to be anti-wetting and anti-icing using femtosecond laser surface processing (FLSP) directly as well as by imprinting PC using a FLSP tungsten carbide (WC) die to produce micron and nanoscale roughness on the surface that is characteristic of anti-wetting surfaces. The micron and nanoscale surface structure on FLSP PC was controlled by adjusting the fluence per laser pulse and number of pulses impinging upon the sample. During stamping applied pressure, temperature, and stamp morphology influenced the imprinted surface structure. Through contact angle measurements, condensation freezing experiments, and placing samples in outdoor icing conditions we demonstrate that both directly processing PC using FLSP and imprinting an FLSP WC surface onto PC enhances the anti-wetting and anti-icing properties. Laboratory scales experiments have shown that the quality of the lens is not affected by the FLSP processing. The next step is to proceed to actual railroad test bed experiments.
Format:

PDF
Funding:

DTRT13-G-UTC59
Collection(s):

University Transportation Centers
Main Document Checksum:

[+]

urn:sha256:a2a50aa4443eb568e7a7f0461f3c70dc8646f2a61b8101c1192b679b95732d9b
Download URL:

https://rosap.ntl.bts.gov/view/dot/66398/dot_66398_DS1.pdf
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Studies on Forming Anti-icing Railroad Traffic Signal Lens by Using Femtosecond Laser Surface Processing Directly (FLSP) or by Stamping Tungsten Carbide FLSP Surfaces Into Railroad Lens Materials

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