+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Software Libraries (/forum-10.html)
+--- Forum: HP-65/67/97 Software Library (/forum-12.html)
+--- Thread: (HP-67) … Apparent conductivity for the transient electromagnetic … method … (/thread-12352.html)
(HP-67) … Apparent conductivity for the transient electromagnetic … method … - SlideRule - 02-03-2019 11:46 PM
An extract from Calculation of apparent conductivity for the transient electromagnetic (coincident loop) method using an HP-67 calculator, GEOPHYSICS, VOL. 45, NO. 7 (JULY 1980); P. 1197-1204, 3 FIGS.
The interpretation of coincident-loop transient electromagnetic (TEM) surveys is often aided by the transformation of TEM data to apparent conductivity values. Present methods of calculating apparent conductivity have a limited usefulness or require access to a computer.
This paper presents an algorithm for calculating apparent conductivity to an accuracy of better than 1 percent for values of the parameter χ=σμA / 4πτ up to 10, where σ = conductivity, μ = magnetic permeability, A = loop area, and τ = sample time. This range of χ is sufficient for most situations encountered in field work.
The algorithm has been programmed for an HP-67 pocket calculator, and the program steps and user instructions are given in standard format. Execution time ranges from 6 to 15 sec. The program should assist the interpretation of TEM surveys in the field.
BEST!
SlideRule