Patent ID: 6490034
Filing Date: 2002-12-03
Classification: B01J,G01N

Abstract:
A micromechanical transmission measuring cell for determining an optical absorption of a sample fluid, comprising:a receptacle formed in a substrate and used for holding the sample fluid, said receptacle having an elongate shape with a longitudinal axis; a light passage opening for introducing the light into the receptacle; and a reflector defined by a wall which has been produced by anisotropic etching of the substrate, wherein the reflector is inclined relative to the longitudinal direction of the receptacle in such a way that the light, which impinges on the surface of the substrate at an angle relative to said surface, is reflected along the longitudinal axis to an opposite wall, most of said light passing through said receptacle without multiple reflections on a wall of said receptacle, and that the optical absorption of the sample fluid is detectable on the basis of the light passing through said receptacle without multiple reflections, wherein a beam transformation of fed-in light into a bundle of substantially parallel rays is effected by a lens, whereas a further lens reverses this process.