| 摘要 |
<p>A system detecting particulates within a liquid flow includes a solid state laser exciting a resonant cavity. It contains a liquid cavity flowing liquid through the beam. Optical elements transmit the beam through the liquid cavity such that laser scatter is indicative of particulates within the flow. The system can include a frequency enhancing crystal such that the beam also includes higher frequency lasing. One of the elements is preferably a reflector at one end of the resonator, so that fewer elements and reflections are present within the cavity. The flow is generated by a nozzle jet or by an inviscid flow jet. Certain optical elements can be made into Brewster windows. The resonant cavity can be responsive to an external laser. It has at least one resonator optical element for reflecting the light energy within the resonant cavity and a feedback system maintains its resonance locked to the external laser.</p> |
