7792

• UCREFRP Catalog Number: 7792
• Author: Kolz, A. L.
• Title: In-water Electrical Measurements for Evaluating Electrofishing Systems.
• USFW Year: 1993.
• USFW - Doc Type: \
• Copyright Material: NO

Ix-WATER ELECTRICAL MEnsummENm 15
50
45
40
35
IE 30
?o
Fig. 13. Voltage profiles for four cylin- 25
ders. 20
Cylinder immersion depth = 60 cm
Cylinder diameter = 0.64 cm - o
=1.27 cm - x
=2.54cm-
=5.08cm- +
15
10
5
0
0
50 100
Distance (centimeters)
Fig. 14. Voltage profiles for two horizon-
tal loops.
150 200
o - 0.64-cm tubing with 36-cm outside diameter
x -1.27 cm tubing with 61-cm outside diameter
50 100 150 200
00
Distance (centimeters)
Voltage Gradient Profiles
The mathematical derivatives of the voltage pro-
file curves were derived using standard numerical
techniques (De Boor 1978) to calculate the voltage
gradient profiles shown in Figs. 18 through 23.
Each figure displays two voltage gradient curves
that correspond to the six electrode groups de-
scribed previously. For example, Fig. 13 is used to
develop the voltage gradient profiles of Fig. 19 for
cylinders having diameters of 0.64 and 5.08 cm.
The voltage gradient profiles for the cylinders hav-
ing diameters of 1.27 and 2.54 cm could also be
added to Fig. 19, but to simplify the graphics only
the two profiles that represent the extremes for a
given group are presented. The gradient profiles for
those electrodes not shown would obviously fit
somewhere between.
Except for the spheres and cylinders, for which
data were correlated with mathematical expres-