Experimental Evaluation Of Components For A Super Compact In-Situ LII Probe Applicable On Automotive Exhaust Pipes

Martin Kupper, Jožef Pulko, Alexander Bergmann, Martin Kraft

Research output: Contribution to conference(Old data) Lecture or PresentationResearchpeer-review

Abstract

Introduction: Laser-Induced Incandescence (LII) is an established technology in science for studying soot in flames and aerosols. Its capability of measuring at high time resolution with accuracies meeting legally mandated limits renders it of high interest also for measuring soot concentrations in automotive exhausts. This work presents the first attempt to realise a highly compact in-situ LII system applicable directly at an automotive exhaust pipe.

Experimental Methods: Key components for the proposed in-situ LII system are a super-compact high-power DPSS laser (CTR HiPoLas®), fast KETEK silicon photomultipliers (SiPM) as detectors and a dedicated optical measurement setup. A measurement cell was specially designed for i) optimized collection of the incandescent radiation and ii) high flexibility, to allow verifying LII both with different aerosols from particle generators (e.g. Jing 5201 miniCAST – Combustion Aerosol STandard) and automotive exhausts from an engine testbed.

Results: Measurements using aerosol from the CAST proved the incandescence signals to be clearly distinguishable from scattered laser light and yielded corresponding LII signals, proving the fundamental feasibility of an in-situ LII probe. It thus appears very likely that previously used extractive cells and large-scale laser sources can be replaced by this approach, providing a true in-situ particle sensor. Further testing is ongoing, as are the tests with real automotive exhausts. Efforts now focus in particular on providing a calibration of the LII signals in dependence on the soot concentration using a CAST, and evaluate the applicability of this calibration for the use on exhaust gases.
Original languageEnglish
Publication statusPublished - 18 Sep 2017
Event36th AAAR Annual Conference - Raleigh Convention Center, Raleigh, North Carolina, United States
Duration: 16 Oct 201720 Oct 2017
https://www.aaar.org/2017/

Conference

Conference36th AAAR Annual Conference
CountryUnited States
CityRaleigh, North Carolina
Period16/10/1720/10/17
Internet address

Keywords

    Cite this

    Kupper, M., Pulko, J., Bergmann, A., & Kraft, M. (2017). Experimental Evaluation Of Components For A Super Compact In-Situ LII Probe Applicable On Automotive Exhaust Pipes. 36th AAAR Annual Conference, Raleigh, North Carolina, United States.

    Experimental Evaluation Of Components For A Super Compact In-Situ LII Probe Applicable On Automotive Exhaust Pipes. / Kupper, Martin; Pulko, Jožef; Bergmann, Alexander; Kraft, Martin.

    2017. 36th AAAR Annual Conference, Raleigh, North Carolina, United States.

    Research output: Contribution to conference(Old data) Lecture or PresentationResearchpeer-review

    Kupper, M, Pulko, J, Bergmann, A & Kraft, M 2017, 'Experimental Evaluation Of Components For A Super Compact In-Situ LII Probe Applicable On Automotive Exhaust Pipes' 36th AAAR Annual Conference, Raleigh, North Carolina, United States, 16/10/17 - 20/10/17, .
    Kupper M, Pulko J, Bergmann A, Kraft M. Experimental Evaluation Of Components For A Super Compact In-Situ LII Probe Applicable On Automotive Exhaust Pipes. 2017. 36th AAAR Annual Conference, Raleigh, North Carolina, United States.
    Kupper, Martin ; Pulko, Jožef ; Bergmann, Alexander ; Kraft, Martin. / Experimental Evaluation Of Components For A Super Compact In-Situ LII Probe Applicable On Automotive Exhaust Pipes. 36th AAAR Annual Conference, Raleigh, North Carolina, United States.
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    title = "Experimental Evaluation Of Components For A Super Compact In-Situ LII Probe Applicable On Automotive Exhaust Pipes",
    abstract = "Introduction: Laser-Induced Incandescence (LII) is an established technology in science for studying soot in flames and aerosols. Its capability of measuring at high time resolution with accuracies meeting legally mandated limits renders it of high interest also for measuring soot concentrations in automotive exhausts. This work presents the first attempt to realise a highly compact in-situ LII system applicable directly at an automotive exhaust pipe.Experimental Methods: Key components for the proposed in-situ LII system are a super-compact high-power DPSS laser (CTR HiPoLas{\circledR}), fast KETEK silicon photomultipliers (SiPM) as detectors and a dedicated optical measurement setup. A measurement cell was specially designed for i) optimized collection of the incandescent radiation and ii) high flexibility, to allow verifying LII both with different aerosols from particle generators (e.g. Jing 5201 miniCAST – Combustion Aerosol STandard) and automotive exhausts from an engine testbed.Results: Measurements using aerosol from the CAST proved the incandescence signals to be clearly distinguishable from scattered laser light and yielded corresponding LII signals, proving the fundamental feasibility of an in-situ LII probe. It thus appears very likely that previously used extractive cells and large-scale laser sources can be replaced by this approach, providing a true in-situ particle sensor. Further testing is ongoing, as are the tests with real automotive exhausts. Efforts now focus in particular on providing a calibration of the LII signals in dependence on the soot concentration using a CAST, and evaluate the applicability of this calibration for the use on exhaust gases.",
    keywords = "Aerosol Instrumentation, Laser induced incandescence, LII, Ru{\ss}, Automobilabgas",
    author = "Martin Kupper and Jožef Pulko and Alexander Bergmann and Martin Kraft",
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    AU - Kraft, Martin

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    N2 - Introduction: Laser-Induced Incandescence (LII) is an established technology in science for studying soot in flames and aerosols. Its capability of measuring at high time resolution with accuracies meeting legally mandated limits renders it of high interest also for measuring soot concentrations in automotive exhausts. This work presents the first attempt to realise a highly compact in-situ LII system applicable directly at an automotive exhaust pipe.Experimental Methods: Key components for the proposed in-situ LII system are a super-compact high-power DPSS laser (CTR HiPoLas®), fast KETEK silicon photomultipliers (SiPM) as detectors and a dedicated optical measurement setup. A measurement cell was specially designed for i) optimized collection of the incandescent radiation and ii) high flexibility, to allow verifying LII both with different aerosols from particle generators (e.g. Jing 5201 miniCAST – Combustion Aerosol STandard) and automotive exhausts from an engine testbed.Results: Measurements using aerosol from the CAST proved the incandescence signals to be clearly distinguishable from scattered laser light and yielded corresponding LII signals, proving the fundamental feasibility of an in-situ LII probe. It thus appears very likely that previously used extractive cells and large-scale laser sources can be replaced by this approach, providing a true in-situ particle sensor. Further testing is ongoing, as are the tests with real automotive exhausts. Efforts now focus in particular on providing a calibration of the LII signals in dependence on the soot concentration using a CAST, and evaluate the applicability of this calibration for the use on exhaust gases.

    AB - Introduction: Laser-Induced Incandescence (LII) is an established technology in science for studying soot in flames and aerosols. Its capability of measuring at high time resolution with accuracies meeting legally mandated limits renders it of high interest also for measuring soot concentrations in automotive exhausts. This work presents the first attempt to realise a highly compact in-situ LII system applicable directly at an automotive exhaust pipe.Experimental Methods: Key components for the proposed in-situ LII system are a super-compact high-power DPSS laser (CTR HiPoLas®), fast KETEK silicon photomultipliers (SiPM) as detectors and a dedicated optical measurement setup. A measurement cell was specially designed for i) optimized collection of the incandescent radiation and ii) high flexibility, to allow verifying LII both with different aerosols from particle generators (e.g. Jing 5201 miniCAST – Combustion Aerosol STandard) and automotive exhausts from an engine testbed.Results: Measurements using aerosol from the CAST proved the incandescence signals to be clearly distinguishable from scattered laser light and yielded corresponding LII signals, proving the fundamental feasibility of an in-situ LII probe. It thus appears very likely that previously used extractive cells and large-scale laser sources can be replaced by this approach, providing a true in-situ particle sensor. Further testing is ongoing, as are the tests with real automotive exhausts. Efforts now focus in particular on providing a calibration of the LII signals in dependence on the soot concentration using a CAST, and evaluate the applicability of this calibration for the use on exhaust gases.

    KW - Aerosol Instrumentation

    KW - Laser induced incandescence

    KW - LII

    KW - Ruß

    KW - Automobilabgas

    M3 - (Old data) Lecture or Presentation

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