Dispersive near-infrared spectrometer with automatic wavelength calibration

a near-infrared spectrometer and automatic technology, applied in the direction of optical radiation measurement, instruments, spectrometry/spectrophotometry/monochromators, etc., can solve problems such as calibration transfer, and achieve the effect of improving the calibration set of nir spectra, improving the dispersive and diffraction grating nir

Inactive Publication Date: 2008-08-28
BUSCH KENNETH W +1
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Problems solved by technology

If the wavelength scales of different spectrometers are miscalibrated (as they inevitably are), problems with calibration transfer may occur.

Method used

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  • Dispersive near-infrared spectrometer with automatic wavelength calibration
  • Dispersive near-infrared spectrometer with automatic wavelength calibration
  • Dispersive near-infrared spectrometer with automatic wavelength calibration

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Embodiment Construction

[0020]The present invention relates to a novel dispersive NIR spectrometer that automatically calibrates the wavelength scale of the instrument without the need for external wavelength calibration materials.13 This NIR spectrometer with automatic calibration as disclosed herein was developed by the inventor in the laboratory from commercially available component parts in novel combination. The spectrometer is in part based on a spectrometer that has been described previously.14 The general layout of a spectrometer 10 is seen in FIGS. 1 and 2. First, a 100-W quartz tungsten halogen (QTH) lamp 1 serves as the source beam for the spectrometer 10. The regulated constant-current power supply associated with the source permits source current to be varied to study its influence in different experiments. It is attached to a source power supply 2. The source beam is focused through a source collimating lens 3. A long-pass cut-on filter 4 with a cut-on wavelength of 1160 nm is attached to the...

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Abstract

The present invention is a dispersive, diffraction grating, NIR spectrometer that automatically calibrates the wavelength scale of the instrument without the need for external wavelength calibration materials. The invention results from the novel combination of: 1) a low power He—Ne laser at right angles to the source beam of the spectrometer; 2) a folding mirror to redirect the collimated laser beam so that it is parallel to the source beam; 3) the tendency of diffraction gratings to produce overlapping spectra of higher orders; 4) a “polka dot” beam splitter to redirect the majority of the laser beam toward the reference detector; 5) PbS detectors and 6) a software routine written in Lab VIEW that automatically corrects the wavelength scale of the instrument from the positions of the 632.8 nm laser line in the spectrum.

Description

[0001]This application is based on and claims priority from U.S. patent application Ser. No. 10 / 890,942 filed Jul. 14, 2004, which is a continuation of U.S. patent application Ser. No. 10 / 093,584 filed Mar. 8, 2002, which claims priority to Provisional patent Application Ser. No. 60 / 274,300 filed on Mar. 8, 2001.BACKGROUND OF THE INVENTION[0002]The present invention relates to a Near-infrared (NIR) spectrometer with automatic wavelength calibration without the need of external calibrating. NIR spectroscopy is the measurement of the wavelength and intensity of the absorption of near-infrared light by a sample. Near-infrared light spans the 800 nm-2.5 micrometers (μm) range and is energetic enough to excite overtones and combinations of molecular vibrations to higher energy levels. NIR spectroscopy is typically used for quantitative measurement of organic functional groups, especially O—H, N—H, and C—H. Analyte detection limits are typically 0.11%.[0003]NIR spectroscopy has been shown...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01J3/00G01J3/28
CPCG01J3/021G01J3/0232G01J3/28G01N21/3563G01N21/274G01N21/35G01N21/359G01J2003/2866
Inventor BUSCH, KENNETH W.RABBE, DENNIS H.
Owner BUSCH KENNETH W
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