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Effects of relative humidity on laser light transmittance during cryogen spray cooling of in vitro skin phantoms
 

Summary: Effects of relative humidity on laser light transmittance during
cryogen spray cooling of in vitro skin phantoms
JC Ramirez-San-Juana,b
, B Choia
, W Francoc
, JS Nelsona
, G Aguilarc
a
Beckman Laser Institute, University of California, Irvine, CA, USA
b
Instituto Nacional de Astrofísica, Óptica y Electrónica, Puebla, México
c
Department of Mechanical Engineering, University of California, Riverside, CA, USA
ABSTRACT
While cryogen spray cooling (CSC) can protect skin epidermis from non-specific thermal damage, spray droplets in-
flight and the cryogen/frost layer that forms on the skin surface may pose a potential problem for laser light attenuation
due to absorption and/or scattering. Employing a hand piece expressly designed for concurrent light and cryogen
delivery on skin phantoms, we studied the effect of relative humidity on light transmittance during and after spray
cooling. Cryogen spurts were aimed at a microscope glass slide and a deformable agar phantom preheated at 32°C.
According to our results, relative humidity plays a very important role in the light transmission during CSC. Light

  

Source: Aguilar, Guillermo - Department of Mechanical Engineering, University of California at Riverside

 

Collections: Engineering