Fig 2. Microfluidic polymer chips for calcium phosphate crystallization analyses produced by ultrasonic hot embossing and welding.

Each chip contains two cuvettes allowing two analyses in one chip. The drawing of the cross-sections is not to scale. A, A two chamber chip design with embossed fluidic channels and cuvette, a polymer foil lid designed for transmitted laser light measurements. B, An improved design including sputtered titanium mirrors on either side of the cuvette, and a diffusor in front of the detector, effectively increasing the measuring path length and distributing the laser light transmitted through the cuvette over the entire surface of the light dependent resistor, LDR.