Laser doppler device for air pollution detection

Hiie Hindrikus; Kalju Meigas

doi:10.1117/12.196101

23 November 1994 Laser doppler device for air pollution detection

Hiie Hindrikus, Kalju Meigas

Proceedings Volume 2249, Automated 3D and 2D Vision; (1994) https://doi.org/10.1117/12.196101
Event: Optics for Productivity in Manufacturing, 1994, Frankfurt, Germany

Abstract

A simple device for small particles detection is presented, consisting of a single-mode diode or gas laser with external cavity. The basis of the measurement is the selfmixing that occurs in the laser active medium when the radiation, scattered back by the moving particle into the laser resonator, interferes with the field inside it and causes changes of a pump current. Information about the number, velocity and size of particles can be derived by processing the current pulses. This compact device is capable of detecting a single microndiameter particle movement.

Citation Download Citation

Hiie Hindrikus and Kalju Meigas "Laser doppler device for air pollution detection", Proc. SPIE 2249, Automated 3D and 2D Vision, (23 November 1994); https://doi.org/10.1117/12.196101

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