Ammonia Distribution Measurement on a Hot Gas Test Bench Applying Tomographical Optical Methods

Publikation: Beitrag in einer FachzeitschriftArtikelForschung

Abstract

Measuring the distribution of gas concentration is a very common problem in a variety of technological fields. Depending on the detectability of the gas, as well as the technological progress of the sector, different methods are used. In this paper, we present a device and methods to detect the ammonia concentration distribution in the exhaust system of diesel engines in order to increase the performance of the exhaust aftertreatment system. The device has been designed for usage on a hot gas test bench simulating exhaust gas conditions. It consists of multiple optical beams measuring ammonia line concentrations by applying nondispersive absorption spectroscopy in the deep ultraviolet region. The detectors consist of photodiodes allowing high sampling rates up to 3 kHz while providing a high signal-to-noise ratio. A detection limit of only 1 ppm has been achieved despite the short path length of only eight centimeters. The obtained line concentrations form an inverse problem. The methodology of the tomographic techniques is described in detail in order to best solve the inverse problem and obtain the ammonia concentration distribution images for each time step.

Originalspracheenglisch
Aufsatznummer896
Seitenumfang12
FachzeitschriftSensors & transducers journal
Jahrgang19
Ausgabenummer4
DOIs
PublikationsstatusVeröffentlicht - 21 Feb 2019

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high temperature gases
Ammonia
seats
ammonia
Gases
optics
Inverse problems
exhaust systems
Oil and Gas Fields
Vehicle Emissions
Equipment and Supplies
Exhaust systems (engine)
Signal-To-Noise Ratio
Exhaust gases
Photodiodes
Absorption spectroscopy
Diesel engines
Limit of Detection
Spectrum Analysis
Signal to noise ratio

Schlagwörter

    ASJC Scopus subject areas

    • Analytische Chemie
    • !!Instrumentation
    • !!Atomic and Molecular Physics, and Optics
    • !!Electrical and Electronic Engineering
    • !!Biochemistry

    Dies zitieren

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    abstract = "Measuring the distribution of gas concentration is a very common problem in a variety of technological fields. Depending on the detectability of the gas, as well as the technological progress of the sector, different methods are used. In this paper, we present a device and methods to detect the ammonia concentration distribution in the exhaust system of diesel engines in order to increase the performance of the exhaust aftertreatment system. The device has been designed for usage on a hot gas test bench simulating exhaust gas conditions. It consists of multiple optical beams measuring ammonia line concentrations by applying nondispersive absorption spectroscopy in the deep ultraviolet region. The detectors consist of photodiodes allowing high sampling rates up to 3 kHz while providing a high signal-to-noise ratio. A detection limit of only 1 ppm has been achieved despite the short path length of only eight centimeters. The obtained line concentrations form an inverse problem. The methodology of the tomographic techniques is described in detail in order to best solve the inverse problem and obtain the ammonia concentration distribution images for each time step.",
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