Title: The TILSAM method adapted into Optical Gas Standards - complementing gaseous reference materials
Authors: Werhahn, Olav, Physikalisch-Technische Bundesanstalt (PTB), Fachbreich 3.4, Analytische Chemie der Gasphase
Petersen, Jan C., Danish National Metrology Institute, Hørsholm, DENMARK
Nwaboh, Javis, Physikalisch-Technische Bundesanstalt (PTB), Fachbreich 3.4, Analytische Chemie der Gasphase
Pogány, Andrea, Physikalisch-Technische Bundesanstalt (PTB), Fachbreich 3.4, Analytische Chemie der Gasphase
Qu, Zhechao, Physikalisch-Technische Bundesanstalt (PTB), Fachbreich 3.4, Analytische Chemie der Gasphase
Contributors: HostingInstitution: Physikalisch-Technische Bundesanstalt (PTB), ISNI: 0000 0001 2186 1887
Pages:11
Language:en
DOI:10.7795/EMPIR.16ENG05.CA.20211013
Resource Type: Text / Article
Publisher: Physikalisch-Technische Bundesanstalt (PTB)
Rights: Private use is allowed for non-profit purposes only.
Dates: Available: 2021-10-14
Created: 2021-09
File: Download File (application/pdf) 2.12 MB (2228000 Bytes)
MD5 Checksum: ba61eaa1785c5d2eaaa9b9bf7de6bf84
SHA256 Checksum: 363da0aa853328b9bb288c21fbfe971fa83d8de24a93e708bc00d24102ba5764
Keywords: TILSAM ; SI-traceability, laser ; spectroscopy ; gas metrology
Abstract: 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].
Citation: Werhahn, Olav ; Petersen, Jan C. ; Nwaboh, Javis ; Et al.. The TILSAM method adapted into Optical Gas Standards - complementing gaseous reference materials. Physikalisch-Technische Bundesanstalt (PTB), 2021. DOI: https://doi.org/10.7795/EMPIR.16ENG05.CA.20211013
Funding: European Commission (EC, ISNI: 0000 0001 2162 673X, Grant Title: Support for standardisation of high voltage testing with composite and combined wave shapes, Grant Number: EMPIR 19NRM07 HV-com²