The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 1999
Filed:
Oct. 16, 1997
D Alan Hanna, Boulder, CO (US);
Datex-Ohmeda, Inc., Louisville, CO (US);
Abstract
A novel process is disclosed for continually or periodically correcting gas spectrometer measurements for wavelength calibration drift without interrupting the gas measurement process. The spectrometer employs certain calibration vectors for use in obtaining single component information based on a composite measurement for a multi-component gas sample. A calibration vector can be provided for each component of interest as well as an average spectrum and other spectra as desired. These calibration vectors are used to selectively compensate for spectral interference between the multiple components so as to effectively isolate and measure a selected spectral characteristic for a particular component of interest. Temperature changes and attendant variations in spectrometer dimensions or other temperature related factors can degrade measurement performance. The novel process involves deriving wavelength correction data for the spectrometer as a function of temperature, monitoring the spectrometer for temperature changes during a time period of interest, and adjusting or shifting one or more of the calibration vectors to compensate for temperature variations. By performing temperature-related adjustments based on the calibration vectors, the computational intensity of the process is greatly reduced, thereby minimizing processor burden/requirements. It is anticipated that the correction process can be continually executed as a low priority or background function in a multitasked system without requiring dedicated processor resources.