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1. 发明公开

EP1588151A1 APPARATUS AND METHODS BASED ON CAVITY RING-DOWN SPECTROSCOPY 审中-公开
标题翻译：器件和程序谐振ABKLINGSPEKTROSKOPIE的BASIS
公开(公告)号：EP1588151A1
公开(公告)日：2005-10-26
申请号：EP04700729.9
申请日：2004-01-08
申请人： Shaw, Andrew Mark
发明人： Shaw, Andrew Mark
IPC分类号： G01N21/55 , G01J3/42 , G01N21/39
CPC分类号： G01N21/39 , G01J3/42 , G01J2003/423
摘要： This invention is generally concerned with sensing apparatus and methods, more particularly apparatus and methods for sensing techniques based upon cavity ring-down spectroscopy (CRDS). An evanescent wave cavity-based optical sensor is described. The sensor comprises an optical cavity formed by a pair of highly reflective surfaces (108, 110) such that light within said cavity makes a plurality of passes between said surfaces, an optical path between said surfaces including a reflection from a totally internally reflecting (112) surface, said reflection from said reflection from said surface generating an evanescent wave to providing a sensing function; a light source (102) to inject light into said cavity; and a detector (114) to detect a light level within said cavity; whereby absorption of said evanescent wave is detectable using said detector to provide said sensing function; wherein said light source comprises a continuous wave light source; and wherein said light source has a power and bandwidth sufficient to couple energy into at least two modes of oscillation of said cavity to overcome losses within the cavity and excite at least two modes of oscillation of said cavity.

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