3-Wavelength Nephelometer Suitable for Aircraft Measurement of Background Aerosol Scattering Coefficient
B. Bodhaine, N. Ahlquist, and R. Schnell. Atmospheric Environment Part a-General Topics, 25 (10):
2267--2276(1991)Times Cited: 18
Cited Reference Count: 22.
Abstract
A new nephelometer suitable for aircraft measurements of aerosol scattering extinction coefficient (sigma-sp) has been constructed and operated under field conditions. This instrument is vacuum tight for operation in a pressurized aircraft cabin and is capable of measuring background tropospheric sigma-sp at an averaging time of 1 min. For example, in a typical atmospheric profile the instrument can measure values of about 10(-4) m-1 with a time resolution of 2 s in a polluted region, and about 10(-7) m-1 with a time resolution of 1 min in a clean region. This sensitivity is made possible by: (1) subtracting in real time the air Rayleigh scattering from the total scattering signal by continuously measuring pressure and temperature in the sampling volume of the instrument; (2) correcting for the dark count and sensitivity of the photomultipliers using a rotating shutter; and (3) using a beam splitter arrangement to allow simultaneous detection by three photomultipliers. A laboratory measurement of instrument noise suggests a 550-nm noise level of about 5 x 10(-8) m-1 at an averaging time of 1 min.
%0 Journal Article
%1 Bodhaine:1991p900
%A Bodhaine, B
%A Ahlquist, N
%A Schnell, R
%D 1991
%J Atmospheric Environment Part a-General Topics
%K imported
%N 10
%P 2267--2276
%T 3-Wavelength Nephelometer Suitable for Aircraft Measurement of Background Aerosol Scattering Coefficient
%U http://links.isiglobalnet2.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=mekentosj&SrcApp=Papers&DestLinkType=FullRecord&DestApp=WOS&KeyUT=A1991GB56600019%20
%V 25
%X A new nephelometer suitable for aircraft measurements of aerosol scattering extinction coefficient (sigma-sp) has been constructed and operated under field conditions. This instrument is vacuum tight for operation in a pressurized aircraft cabin and is capable of measuring background tropospheric sigma-sp at an averaging time of 1 min. For example, in a typical atmospheric profile the instrument can measure values of about 10(-4) m-1 with a time resolution of 2 s in a polluted region, and about 10(-7) m-1 with a time resolution of 1 min in a clean region. This sensitivity is made possible by: (1) subtracting in real time the air Rayleigh scattering from the total scattering signal by continuously measuring pressure and temperature in the sampling volume of the instrument; (2) correcting for the dark count and sensitivity of the photomultipliers using a rotating shutter; and (3) using a beam splitter arrangement to allow simultaneous detection by three photomultipliers. A laboratory measurement of instrument noise suggests a 550-nm noise level of about 5 x 10(-8) m-1 at an averaging time of 1 min.
@article{Bodhaine:1991p900,
abstract = {A new nephelometer suitable for aircraft measurements of aerosol scattering extinction coefficient (sigma-sp) has been constructed and operated under field conditions. This instrument is vacuum tight for operation in a pressurized aircraft cabin and is capable of measuring background tropospheric sigma-sp at an averaging time of 1 min. For example, in a typical atmospheric profile the instrument can measure values of about 10(-4) m-1 with a time resolution of 2 s in a polluted region, and about 10(-7) m-1 with a time resolution of 1 min in a clean region. This sensitivity is made possible by: (1) subtracting in real time the air Rayleigh scattering from the total scattering signal by continuously measuring pressure and temperature in the sampling volume of the instrument; (2) correcting for the dark count and sensitivity of the photomultipliers using a rotating shutter; and (3) using a beam splitter arrangement to allow simultaneous detection by three photomultipliers. A laboratory measurement of instrument noise suggests a 550-nm noise level of about 5 x 10(-8) m-1 at an averaging time of 1 min.},
added-at = {2010-06-22T19:38:37.000+0200},
author = {Bodhaine, B and Ahlquist, N and Schnell, R},
biburl = {https://www.bibsonomy.org/bibtex/29869e272d22fa56955d3990c04053750/gsmith},
date-added = {2010-03-10 16:47:11 -0500},
date-modified = {2010-03-10 16:48:23 -0500},
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journal = {Atmospheric Environment Part a-General Topics},
keywords = {imported},
label = {rec-number 971},
local-url = {file://localhost/Users/geoffreysmith/Documents/Papers/Atmospheric%20Environment%20Part%20a-General%20Topics/1991/Atmospheric%20Environment%20Part%20a-General%20Topics,%2025,%202267-2276%201991.pdf},
note = {Times Cited: 18
Cited Reference Count: 22},
number = 10,
pages = {2267--2276},
pmid = {A1991GB56600019},
rating = {0},
timestamp = {2010-06-22T19:39:24.000+0200},
title = {3-Wavelength Nephelometer Suitable for Aircraft Measurement of Background Aerosol Scattering Coefficient},
uri = {papers://E88B624E-D406-46FF-9D95-BB9C1AAE3FDC/Paper/p900},
url = {http://links.isiglobalnet2.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=mekentosj&SrcApp=Papers&DestLinkType=FullRecord&DestApp=WOS&KeyUT=A1991GB56600019%20},
volume = 25,
year = 1991
}