Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Response Linearization of a Diode Detector Type Radio Frequency Electric Field Probe.
Author Ali, Joseph S. ; Anderson, George ; Bailey, E. Baker ;
CORP Author Health Effects Research Lab., Research Triangle Park, NC. ;Northrop Services, Inc., Research Triangle Park, NC.
Year Published 1982
Report Number EPA-600/J-82-025;
Stock Number PB83-223735
Additional Subjects Bioinstrumentation ; Probes ; Electric fields ; Signal processing ; Linearization
Library Call Number Additional Info Location Last
NTIS  PB83-223735 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 8p
An EPROM-based linearization circuit with a resolution of 0.1 percent of full scale has been designed to linearize the response of an orthogonal dipole electric field probe terminated with diodes. Design approach, performance, and probe characteristics are discussed. The nonlinear transducer response is first modeled with a fourth-order polynomial which fits the log-transformed calibration data. The equation is then evaluated at discrete points determined by the memory size and the A/D converter resolution. The antilog of the dependent variable is loaded into an EPROM memory for subsequent readout with a D/A converter and summing network. The response of other nonlinear transducers can be linearized by this method.