| 摘要 |
The present invention features a system for detecting a substance in a fluid sample. A capillary is provided with a longitudinal axis and a channel is formed in it for receiving a fluid sample. The channel is disposed parallel to the longitudinal axis. A reflecting surface surrounds the outer surface of the capillary for reflecting electromagnetic energy. The reflecting surface has an incident window for allowing the electromagnetic energy to enter the capillary and an exit window for allowing the electromagnetic energy to exit the capillary. The exit window is disposed downstream of the incident window with respect to the longitudinal axis, so that the electromagnetic energy that enters the capillary is internally reflected more than once by the reflecting surface.
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