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Title:
APPARATUS FOR SPECTROSCOPIC MEASUREMENT OF TRACE SPECIES
Document Type and Number:
Japanese Patent JP2010014739
Kind Code:
A
Abstract:

To provide an improved apparatus for detection and measurement of trace species in a gas or a liquid sample.

A sensor of ring down cell formed from an optical fiber is exposed to the sample gas or liquid. A coherent source emits radiation into the optical fiber loop, which is in turn received at an output coupler. The fiber optic ring is coupled to a sensor which has a portion thereof, between the input and output, exposed to the sample gas or sample liquid. The sensor has an extended evanescent region. A processor is coupled to the receiver and determines the level of trace species in the gas or liquid sample based on the rate of decay of the radiation within the fiber optic ring.


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Inventors:
LEHMANN KEVIN K
TARSA PETER B
RABINOWITZ PAUL
Application Number:
JP2009243613A
Publication Date:
January 21, 2010
Filing Date:
October 22, 2009
Export Citation:
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Assignee:
UNIV PRINCETON
International Classes:
G01N21/27; G01N21/39; G01J3/42; G01N21/77
Domestic Patent References:
JPH10246694A1998-09-14
JPS54141691A1979-11-05
JPH11326184A1999-11-26
JPH0712715A1995-01-17
JPH08101120A1996-04-16
JPH06125124A1994-05-06
JPH11223597A1999-08-17
JP2004500574A2004-01-08
Foreign References:
WO2001071316A22001-09-27
Attorney, Agent or Firm:
Takuji Yamada
Mitsuo Tanaka
Hiroshi Okabe



 
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