Masters Theses

Abstract

"A technique is investigated for counting water droplets formed in a vertical plate steady flow thermal diffusion chamber designed to count cloud condensation nuclei. The counting technique utilizes light scattering. The light source is a He-Ne laser. The detector is a photomultiplier tube. The technique differs from that used in instruments manufactured by Bausch and Lomb, Royco, Climet, etc., in that the aerosol is not passed through a capillary tube. Instead, the viewed volume is optically defined.

It was found that in the configuration tested, the viewed volume is not well enough defined for use with polydisperse aerosols, although the apparatus as tested is useful for sizing and counting monodisperse aerosols. The investigation also indicates that the most likely way to improve the performance would be to use a thin rectangular slit as an optical stop, rather than the circular aperture tested"--Abstract, page ii.

Advisor(s)

Alofs, Darryl J.

Committee Member(s)

Stampfer, J. F.

Department(s)

Mechanical and Aerospace Engineering

Degree Name

M.S. in Aerospace Engineering

Sponsor(s)

National Science Foundation (U.S.). Atmospheric Sciences Section

Comments

This work was supported by the National Science Foundation under grant number GA-30876 of the Atmospheric Sciences Section.

Publisher

University of Missouri--Rolla

Publication Date

1973

Pagination

vi, 36 pages

Note about bibliography

Includes bibliographical references (page 34).

Rights

© 1973 Duane Burton Bush, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Optical detectors -- DesignAtmospheric nucleation -- Measurement -- InstrumentsCondensation (Meteorology)

Thesis Number

T 2915

Print OCLC #

6020009

Electronic OCLC #

911403068

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