Optical characteristics of a PbS detector array spectrograph for online process monitoring

Markku Kansakoski; Jouko Malinen

doi:10.1117/12.341019

26 February 1999 Optical characteristics of a PbS detector array spectrograph for online process monitoring

Markku Kansakoski, Jouko Malinen

Proceedings Volume 3537, Electro-Optic, Integrated Optic, and Electronic Technologies for Online Chemical Process Monitoring; (1999) https://doi.org/10.1117/12.341019
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

The use of optical spectroscopic methods for quantitative composition measurements in the field of process control is increasing rapidly. Various optical configurations are already in use or are being developed, with the aim of accomplishing the wavelength selectivity needed in spectroscopic measurement. The development of compact and rugged spectrometers for process monitoring applications, has been one of the major tasks for the optical measurements research team at VTT Electronics. A new PbS detector array- based spectrometer unit has now been developed for use in process analyzers, providing 24-wavelengths ranging from 1350 to 2400 nm. Extensive testing has been carried out to examine the performance of the developed units, concerning performance in normal operating conditions, characteristics vs. temperature, unit-to-unit variation and preliminary environmental testing. The main performance characteristics of the developed spectrometer unit include stable output, a band center wavelength (CW) unit-to-unit tracking better than -+ 1 nm, a band CW draft vs. operating temperature less than 1.8 nm in the temperature range +10 degree(s)C...+50 degree(s)C, and optical stray light below 0.1 percent. The combination of technical performance, small size, rugged construction, and potential for medium manufacturing cost (4000-5000 dollars in quantities) make the developed unit a promising alternative in developing competitive high-performance analyzers for various NIR applications.

Citation Download Citation

Markku Kansakoski and Jouko Malinen "Optical characteristics of a PbS detector array spectrograph for online process monitoring", Proc. SPIE 3537, Electro-Optic, Integrated Optic, and Electronic Technologies for Online Chemical Process Monitoring, (26 February 1999); https://doi.org/10.1117/12.341019

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