| 摘要 |
Light from an emitter 110, which may be an LED, is guided by at least one light guide 130 to reaction vessel 140, for example a transparent or translucent cuvette or microtiter plate. After being transmitted through or reflected from the vessel the light is then guided to detector 120, possibly a photo-diode, by at least one guide 160. The light guides may comprise a light guide head such as a prism and a plastic optical fibre (POF), which may be exchangeable. The vessel material and light wavelength used may be chosen to ensure low transmission, for instance using polypropylene and 430nm (blue) light respectively. Uses may include detection of liquid level or air bubbles within or integrity of the vessel, or of the presence or position of it. The reaction vessel may comprise a position marker such as a rib or rough surface. |
