Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Remote Identification of Aerosols

IP.com Disclosure Number: IPCOM000044853D
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Coufal, H: AUTHOR [+3]

Abstract

A remote method of identifying aerosols is described that do not have a well defined luminescence or Raman scattering. This method detects photo-thermal effects produced in and near the aerosols irradiated by a tunable excitation laser beam, which can be tuned to a peak absorption line of the aerosol or off an absorption line. The photo-thermal effects may be intermodulated light scattering or thermal IR radiation from the aerosols.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Remote Identification of Aerosols

A remote method of identifying aerosols is described that do not have a well defined luminescence or Raman scattering. This method detects photo-thermal effects produced in and near the aerosols irradiated by a tunable excitation laser beam, which can be tuned to a peak absorption line of the aerosol or off an absorption line. The photo-thermal effects may be intermodulated light scattering or thermal IR radiation from the aerosols.

An example of this method will be illustrated by a description of the apparatus shown in the drawing in which the spatial identification of aerosols is based on photo-thermal light scattering. Aerosols 10 are irradiated by a modulated excitation beam 12 such as a 1 watt krypton laser beam modulated at a few hundred Hertz. A probe laser beam 14, for example, a 1 milliwatt HeNe laser, is focused onto the aerosols 10 so that it will cause a light scattering photo-thermal effect. The light scattering passes through the lens 14 and filter 16 to the monochromator 18 and the photomultiplier 20 to produce a signal 22 which is observed on the oscilloscope 24.

Disclosed anonymously

1