Patent ID: 6224830
Filing Date: 2001-05-01
Classification: G01N

Abstract:
An absorbance cell for a microfluid device, the absorbance cell comprising:a bottom plate having a channel bearing surface in which a channel is defined, the channel having a fluid inlet and fluid outlet, the channel having a depth of about 10-30 .mu.m;a top plate having a channel facing surface bound to the channel bearing surface of the bottom plate;first and second reflecting elements formed on opposed sides of the channel to form a waveguide through which the channel extends such that radiation propagating along the waveguide makes multiple passes across the channel, the waveguide having a radiation input end and a radiation output end; andelectrically non-conducting material of one of the top plate and bottom plate being disposed between the first reflecting element and the channel, the electrically non-conducting material being transparent to measuring radiation.