Abstract
A photoacoustic gas detector for SO2 was developed for ship exhaust gas emission monitoring. The basic measurement setup is based on the absorption of electromagnetic radiation of SO2 at 285 nm wavelength. A commercially available ultraviolet (UV) light-emitting diode (LED) is used as the light source and a micro-electro-mechanical system (MEMS) microphone as the detector. In order to achieve the required detection limits in marine applications, a measuring cell which allows an acoustically resonant amplification of the photoacoustic signal was developed and characterized. A limit of detection of 1 ppm was achieved in lab conditions during continuous gas flow. Long-term measurements on a container ship demonstrated the application relevance of the developed system.
Highlights
Ship air pollution harms health by causing respiratory diseases, and causes overall air quality problems, which have a negative impact on the natural environment [1]
The demand in reliable combustion emission-monitoring systems highlyhighly increased emission-monitoring systems increased since the global restrictions of the of container ship SO
2 gas detector gas monitor is based on is the resonant photoacoustic detection, using commercially availaSO2 gas monitor based on the resonant photoacoustic detection, using commercially available
Summary
Ship air pollution harms health by causing respiratory diseases, and causes overall air quality problems, which have a negative impact on the natural environment (e.g., acid rain) [1]. Publications on photoacoustic gas sensors using a light-emitting diode (LED) as a light source and a microphone or a quartz tuning fork as an acoustic transducer can be found for CO2 detection [10,11] and methane detection in [12,13]. Since the emission power of UV-LEDs has increased significantly in recent years and the price has decreased at the same time, these light sources represent a very promising starting point to reduce the overall system costs of photoacoustic sensor systems For this reason, we decided to combine commercially available UV-LEDs and MEMS-microphones with the aim to develop a sensitive, reliable, and price-reduced PA gas monitor with a high potential of commercialization. The developed SO2 ship emission monitor was mounted to the funnel of a traveling container ship to conduct primary SO2 emission measurements
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