Simultaneous three-channel measurements of hydrogen diffusion with light intensity analysis of images by employing webcam

After exposure to high-pressure hydrogen and subsequent decompression, a three-channel technique for simultaneous measurement of hydrogen sorption content emitted from polymers and diffusivity and plastics was developed. The technique is based on the volumetric measurement of released H-2 gas combined with light intensity analysis of bright water level images by employing webcams and Lab view software. By measuring the released hydrogen corresponding to the change in water level against elapsed time in three parallel channels in real time, the total hydrogen uptake and diffusivity as a function of exposed pressure were determined with the developed diffusion analysis program. The technique was applied to three kinds of sealing rubber materials and two polyethylene liner materials. The pressure-dependent transport behaviors obtained by the developed technique are discussed and compared with those obtained by different techniques. Diffusion parameters versus variation in volume and shape for high-density polyethylene are presented together with an uncertainty evaluation for this method.