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TILSAM – Traceable Infrared Laser Spectrometric Amount fraction Measurement - has been available since 2009 [1]. Onboarded by a EURAMET research project and validated by a comparison study of ambient level carbon dioxide gas standards [2], this method has been successfully applied for CO2 and CO quantifications in greenhouse gas measurements, breath analysis studies, and industrial drying processes [3-6]. Facing new challenges in gas analysis related to an increasing number of critical analytes as well as an increasing demand from stakeholders in industry and atmospheric sciences for improved amount fraction sensitivity, the TILSAM method has been combined with appropriate spectroscopy techniques to form an instrument class of its own, called Optical Gas Standard (OGS). TILSAM-compliant OGS systems are seen to advance and complement the use of gaseous reference materials. This is for example the case when the needed amount fractions cannot be supported by existing reference gases, or analyte definitions and combinations of species asked by customers do not allow them to be filled into pressurized cylinders because of their reactivity or instability. Furthermore, OGS systems can serve SI-traceability demands in applications where reference gases cannot be carried for and analyzer down times for individual calibrations are not economically tolerable. In a collaborative approach DFM and PTB both have progressed their spectrometric gas metrology efforts towards more advanced individual OGSs for various species, including CO, H2O, HCl, NH3, NO2. The TILSAM method has not yet been merged into an operational CMC-based service. However, ongoing work will advance the TILSAM protocol [1], providing an improved updated edition. This contribution will introduce the TILSAM method, provide an outlook into the new edition, and discusses a suite of applications having advanced TILSAM and related instrumentation to finally become an OGS [7]. |
