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Computer automation of a dry-dust generating system.

Authors
O'Shaughnessy-PT; Hemenway-DR
Source
Inhal Toxicol 1994 Mar; 6(2):95-113
NIOSHTIC No.
00220072
Abstract
A computer controlled system for the automated generation of a dry aerosol in an exposure chamber was developed to minimize variability in aerosol concentration over time. The automated exposure system consisted of a microprocessor controlled stepper motor, a personal computer with analog to digital converter, and a real time aerosol monitor. A computer program was written so that these devices could be used to produce a chamber dust concentration at a level selected. Attempts were made to reduced temporal variation using time series analysis. The mean of the absolute value of the difference between successive measurements was used as an indication of concentration variability for a particular trial. Trials were performed to determine the response of the chamber concentration levels to step changes in generator speed. Typical results for two trials performed to achieve dust concentrations of 10 and 25mg/m3 were presented. Small changes did not coincide well with desired levels, and the data suggested a longer time period necessary to realize the effect of a small speed change on concentration level. The authors conclude that the automated system has potential, although further work is needed to refine inconsistencies.
Keywords
NIOSH-Publication; NIOSH-Grant; Aerosol-particles; Airborne-dusts; Dust-exposure; Equipment-design; Exposure-levels; Automation; Exposure-chambers
Contact
Civil Engineering University of Vermont RM 226 Votey Bldg Burlington, VT 05405
CODEN
INHTE5
Publication Date
19940301
Document Type
Journal Article
Funding Amount
74200
Funding Type
Grant
Fiscal Year
1994
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R03-OH-03185
Issue of Publication
2
ISSN
0895-8378
Source Name
Inhalation Toxicology
State
VT
Performing Organization
University of Vermont & St Agric College, Burlington, Vermont
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