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Highly sensitive laser-based sensor for nanoparticles in air using a dual-ring-mirror setup.

Robert Schrobenhauser¹, Rainer Strzoda, Maximilian Fleischer

¹Siemens AG, Corporate Technology, Otto-Hahn-Ring 6, 81739 Munich, Germany. robert.schrobenhauser@wsi.tum.de

|July 25, 2012

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This study introduces a novel technique using ring mirrors to enhance nanoparticle detection via laser light scattering, improving sensitivity for small particles below 100 nm.

Area of Science:

Environmental Science
Optical Engineering
Nanotechnology

Background:

Laser light scattering is a common method for detecting airborne nanoparticles.
Sensor miniaturization challenges the sensitivity of traditional light scattering techniques.
Enhanced light intensity is crucial for accurate detection in compact devices.

Purpose of the Study:

To develop an improved technique for detecting sub-100 nm nanoparticles.
To overcome sensitivity limitations in miniaturized laser scattering sensors.
To enhance the intensity of scattered light for improved measurement reliability.

Main Methods:

Utilizing two spherical ring mirrors in a forward-scattering setup.
Implementing a novel optical configuration to focus scattered light.

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Testing the system with polystyrene nanoparticles of known diameters.

Main Results:

Successfully detected polystyrene nanoparticles with diameters of 92 nm.
Achieved a signal-to-noise ratio exceeding 10 for small particle detection.
Demonstrated the effectiveness of the ring mirror system in enhancing sensitivity.

Conclusions:

The developed ring mirror technique significantly improves nanoparticle detection sensitivity.
This method is effective for identifying nanoparticles below 100 nm, even in miniaturized sensors.
The technique offers a promising solution for enhancing the performance of airborne nanoparticle detection systems.