Patent ID: 9581491
Date: 2017-02-28
CPC Classifications: G01J,G01N,G02B

Claim:
1. A flow cell for a fluorescence spectrometer, the flow cell comprising: a flow channel to receive a flow of a liquid sample; an excitation light entrance window to receive excitation light from a light source; and an emission light exit window to transmit fluorescent emission light from the liquid sample in the flow channel from the flow cell; wherein the excitation light entrance window and/or emission light exit window includes a waveguide including: wherein the inner end face of the waveguide: wherein the flow cell includes an end pad of opaque, light absorbing material surrounding an end portion of the waveguide core adjacent the flow channel and adjacent the inner end face of the waveguide, wherein the end pad prevents light from propagating directly from the excitation light entrance window to the excitation light exit window.