Record Display for the EPA National Library Catalog

RECORD NUMBER: 27 OF 72

OLS Field Name OLS Field Data
Main Title Development of Range Squared and Off-Gating Modifications for a Lidar System.
Author Bethk, George W. ;
CORP Author General Electric Co., Philadelphia, Pa. Space Div.
Year Published 1973
Report Number EPA-68-02-0570; 650/2-73-040;
Stock Number PB-228 715
Additional Subjects Optical radar ; Plume detection ; Range gating ; Revisions ; Smoke ; Air pollution ; Remote sensing ; Photomultiplier tubes ; Data processing ; Transmittance ; Measurement ;
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB-228 715 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 54p
Abstract
The study was intended to eliminate the dorminant source of error in the remote measurement of smoke-stack plumes using lidar, and to improve the data presentation of the lidar transmittance measurement. The use of a special grid-controlled photomultiplier tube and off-gating system has resulted in a large reduction of photomultiplier tube afterpulsing which has been the principal problem limiting the accuracy of plume transmittance measurements. A range-correcting time-squared amplifier has also been developed which permits much faster and more convenient data reduction than formerly possible. The above two developments have been adapted to an existing van-mounted EPA lidar system; and the improved overall system accuracy has been evaluated using both opaque and semi-transparent targets of known transmittance. (Author)