Threat representative droplet generation and surface interaction analysis

Steven Simpson; Thomas H. Chyba; Robert M. Jones; Gordon Harper; Diane Haslam

doi:10.1117/12.883952

3 June 2011 Threat representative droplet generation and surface interaction analysis

Steven Simpson, Thomas H. Chyba, Robert M. Jones, Gordon Harper, Diane Haslam

Proceedings Volume 8018, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII; 80181S (2011) https://doi.org/10.1117/12.883952
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

We present our experiments with state-of-the-art equipment to dispense threat-representative (3 - 90 nL) freely falling droplets of viscous chemical material (< 500 cP) at room temperature and measure their time-dependent interactions with realistic surface substrates (road surfaces). A direct displacement droplet dispenser is used to generate the droplets and a goniometer/tensiometer is used to analyze the surface interaction of the free-falling droplets after surface impact. The advanced goniometer system is able to characterize the surfaces, capture images of the impact and time dependent droplet morphology after impact, and is able to calculate the average contact angle and droplet volume as a function of time. By coupling these instruments, a free-falling threat-representative droplet of viscous material can be created on demand and the behavior of the droplet on a surface can be monitored as a function of time. Knowledge of how these droplets behave on surfaces is critical in understanding an entire chemical threat scenario and directly impacts the design, testing, and success of standoff surface chemical sensor technology and modeling efforts alike. We are currently working to address this knowledge gap by recording 'cradle-to-grave' droplet dissemination and surface interaction events.

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Steven Simpson, Thomas H. Chyba, Robert M. Jones, Gordon Harper, and Diane Haslam "Threat representative droplet generation and surface interaction analysis", Proc. SPIE 8018, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII, 80181S (3 June 2011); https://doi.org/10.1117/12.883952

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KEYWORDS

Liquids

Cameras

Chemical analysis

Image processing

Spherical lenses

Glasses

Sensors

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