Infrared spectrometer

A spectrometer and infrared technology, applied in the field of infrared spectrometer, can solve the problems of lengthy sample collection and preparation, difficult on-site application, and difficult real-time analysis

Active Publication Date: 2011-04-20
UK RES & INNOVATION LTD
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Problems solved by technology

For any application that requires real-time, high-frequency data and/or in-situ measurements, MS suffers from tedious sample acquisition and preparation and difficulties in real-

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Embodiment Construction

[0025] The inventors of the present invention have already reported in "Carbon isotopomers measurement using mid-IR tunable laser sources" Damien Weidmann, et al, Isotopes in Environmental and Health Studies, Vol.41, No.4, December 2005, pp293-302 (DOI: 10.1080 / 10256010500384325), which is hereby incorporated by reference in its entirety.

[0026] Absorption spectroscopy techniques using infrared laser sources offer improvements over MS. The useful spectral range for absorption spectroscopy is considered to lie in the "fingerprint" region in the mid-infrared range (2 microns to 25 microns), where most molecules exhibit strong vibrational transitions.

[0027] For example, the identification and measurement of gases released by volcanoes provides information on the origin of volcanoes and thus can help explain volcano behavior and predict eruptions. There is also information that tracks gas concentrations in volcanic emissions in real time, and measurements of isotope ratios ...

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Abstract

The present invention provides a method and apparatus for detecting, by absorption spectroscopy, an isotopic ratio of a sample, by passing first and second laser beams of different frequencies through the sample. Two IR absorption cells are used, a first containing a reference gas of known isotopic ratio and the second containing a sample of unknown isotopic ratio. An interlacer or reflective chopper may be used so that as the laser frequencies are scanned the absorption of the sample cell and the reference cell are detected alternately. This ensures that the apparatus is continuously calibrated and rejects the baseline noise when phase sensitive detection is used.

Description

technical field [0001] The invention relates to an infrared (IR) spectrometer, in particular to a tunable IR laser spectrometer. [0002] The invention also relates to isotope ratio determination methods and methods for selecting a pair of isotope spectral lines for a sample suitable for isotope ratio determination. Background technique [0003] Stable isotope concentration and flux measurements have become vital backbone technologies in many fields of science. So far, mass spectrometry (MS: mass spectrometry) has become the preferred technique for isotope analysis. For any application that requires real-time, high-frequency data and / or in-situ measurements, MS suffers from tedious sample acquisition and preparation and difficulties in real-time analysis. Furthermore, MS does not significantly resolve small mass differences well. The use of MS is limited to dedicated laboratories and thus difficult to apply in the field. There is a growing need to overcome these shortcom...

Claims

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Application Information

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IPC IPC(8): G01J3/42G01J3/08G01N21/39G01N21/27G01N21/35
CPCG01J3/427G01J3/0232G01J3/0286G01N2021/399G01N21/39G01N21/276G01J3/08G01N21/3518G01J3/02G01J3/0208
Inventor 达米安・魏德曼
Owner UK RES & INNOVATION LTD
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