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Continuous optical monitoring of asbestos in air.

Authors
Anonymous
Source
The John B. Pierce Foundation of Connecticut, Incorporated, 1980 Aug; :1-6
Link
NIOSHTIC No.
00116184
Abstract
The development of a continuous optical monitor for determining airborne asbestos (1332214) fibers is described. The initial design of the device is reviewed along with later modifications implemented to increase sensitivity and specificity. The final device consists of eight platinum wire electrodes, a glass tube, and a helium neon laser. Two high voltage transformers energized with 400 hertz sinusoidal voltages also are used. The electric field within the glass tube is analyzed by a computer. For sampling, the laser beam shines down the glass tube, and light reflected by the particles within the lumen of the tube passes up through the aperture of the the photomultiplier cathode. Air is drawn up through the tube at an adjustable flow rate. The glass tube does not distort the electric field, and a uniform electric current ensure that polarized fibers will not migrate to the tube walls and that the forces on the fibers will be the same anywhere within the lumen.
Keywords
NIOSH-Grant; Control-technology; Air-contamination; Analytical-instruments; Equipment-design; Asbestos-dust; Fibrous-bodies; Air-sampling-equipment; Optic-system
Contact
Biophysics Division John B Pierce Fdn Laboratory 290 Congress Avenue New Haven, Conn 06519
CAS No.
1332-21-4
Publication Date
19800831
Document Type
Final Grant Report
Funding Amount
117151
Funding Type
Grant
Fiscal Year
1980
NTIS Accession No.
PB88-247598
NTIS Price
A02
Identifying No.
Grant-Number-R01-OH-00647
NIOSH Division
OEP
Priority Area
Control-technology
Source Name
The John B. Pierce Foundation of Connecticut, Incorporated
State
CT
Performing Organization
John B. Pierce Foundation Lab, Inc., New Haven, Connecticut
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