Aerosol absorption measurement with a sinusoidal phase modulating fiber optic photo thermal interferometer

Shuwang Li; Shiyong Shao; Haiping Mei; Ruizhong Rao

doi:10.1117/12.2246855

25 October 2016 Aerosol absorption measurement with a sinusoidal phase modulating fiber optic photo thermal interferometer

Shuwang Li, Shiyong Shao, Haiping Mei, Ruizhong Rao

Author Affiliations +

Proceedings Volume 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology; 101561A (2016) https://doi.org/10.1117/12.2246855
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China

Abstract

Aerosol light absorption plays an important role in the earth’s atmosphere direct and semi-direct radiate forcing, simultaneously, it also has a huge influence on the visibility impairment and laser engineering application. Although various methods have been developed for measuring aerosol light absorption, huge challenge still remains in precision, accuracy and temporal resolution. The main reason is that, as a part of aerosol light extinction, aerosol light absorption always generates synchronously with aerosol light scattering, and unfortunately aerosol light scattering is much stronger in most cases. Here, a novel photo-thermal interferometry is proposed only for aerosol absorption measurement without disturbance from aerosol scattering. The photo-thermal interferometry consists of a sinusoidal phase-modulating single mode fiber-optic interferometer. The thermal dissipation, caused by aerosol energy from photo-thermal conversion when irritated by pump laser through interferometer, is detected. This approach is completely insensitive to aerosol scattering, and the single mode fiber-optic interferometer is compact, low-cost and insensitive to the polarization shading. The theory of this technique is illustrated, followed by the basic structure of the sinusoidal phase-modulating fiber-optic interferometer and demodulation algorithms. Qualitative and quantitative analysis results show that the new photo-thermal interference is a potential approach for aerosol absorption detection and environmental pollution detection.

Citation Download Citation

Shuwang Li, Shiyong Shao, Haiping Mei, and Ruizhong Rao "Aerosol absorption measurement with a sinusoidal phase modulating fiber optic photo thermal interferometer", Proc. SPIE 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology, 101561A (25 October 2016); https://doi.org/10.1117/12.2246855

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