Calibration of dispersive Raman process analyzers

James M. Tedesco; Kevin L. Davis

doi:10.1117/12.341033

26 February 1999 Calibration of dispersive Raman process analyzers

James M. Tedesco, Kevin L. Davis

Proceedings Volume 3537, Electro-Optic, Integrated Optic, and Electronic Technologies for Online Chemical Process Monitoring; (1999) https://doi.org/10.1117/12.341033
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

Widespread acceptance of Raman spectroscopy in chemical process monitoring requires instrument calibration, which is automated, repeatable, reliable, verifiable, and transferable from instrument to instrument. Key elements to be calibrated in a dispersive Raman analyzer are Raman emission wavelengths, the spectral response of the instrument, and the excitation laser wavelength. Modern Raman instruments are capable of simultaneously monitoring multiple sample points in a process pipeline. In a typical industrial installation, multiple remote probe heads are coupled to a central instrument (laser source, spectrograph, CCD detector and control/software) via fiber optic cables up to hundreds of meters in length. Instruments must self- calibrate and validate without direct access to remote probe head installations. The presence of a holographic laser notch filter in the system presents unique calibration challenges. The implications of these issues on instrument configuration and calibration/ validation protocol are discussed. Candidate wavelength and intensity calibration references are compared. Examples of industrial Raman applications and their requirements on calibration accuracy and precision are given.

Citation Download Citation

James M. Tedesco and Kevin L. Davis "Calibration of dispersive Raman process analyzers", Proc. SPIE 3537, Electro-Optic, Integrated Optic, and Electronic Technologies for Online Chemical Process Monitoring, (26 February 1999); https://doi.org/10.1117/12.341033

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