Measuring the parameters of an electrostatic field
- PDF / 317,637 Bytes
- 4 Pages / 612 x 774 pts Page_size
- 98 Downloads / 264 Views
2. 3. 4. 5.
P . L . Gefter and I. V.LokshSna, Instruments and Method for the Determination of Electrification of Textile Materials in Industrial and Laboratory Conditions [in Russian], TsNllTEILegprom, Moscow (1969). A . M . llyukovich, Measurement of High Resistance [in Russian], Energiya, Moscow (1971). P . L . Gefter, E. V. Budzinskaya, and V. N. Stysis, in: Prevention of the Harmful Effects of Static Electricity [in Russian], NllT~Khim, Moscow (1975). A . M . llyukovich, V. I. Karlashchuk, and V. A. Kulikov~ Trudy VNIIFTRI [in Russian], Vol. 1(31), Part 2, Moscow (1970). I . V . Dzyubenko, Trudy VNIIFTRI [in Russian], Vol, 1(31), Part 2, Moscow (1970).
MEASURING THE PARAMETERS OF AN ELECTROSTATIC FIELD UDC 621.319.7.08
A. Go Moshkov and L. G. Gross
The majority of the modern instruments designed to measure the parameters of electrostatic fields depend on the use of the electrostatic induction effect. Electrostatic induction produces charges on the surface of the measuring electrode of a transducer and the field from these is imposed on the field being measured, thereby distorting it. Consequently, the measuring transducer of any instrument designed to measure the parameters of an electrostatic field, regardless of the conversion principle employed, converts the magnitude of a distorted field. It is also well known that a meter for the parameters of an electrostatic field which is calibrated with one field source is not suitable for the measurement of a field that has different dimensions and configuration [i, 2]. Meters of this sort are usually calibrated in the uniform field of a parallel-plate capacitor [i]. However, under actual circumstances the parameters of nonuniform fields must be measured. For this case a method of calibration in the field of a sphere is proposed in [3]. It is evidently particularly suitable for portable meters with which it is not convenient to use guard rings. The field measured with such a meter is always distorted. In order to allow for the distortion, the influence of various factors must be examined. We will designate the distortion factor for electric-field intensity by
~=~/Eo,
(i)
where E is the average intensity of the distorted field at the surface of the measuring electrode of the instrument's transducer and Eo is the intensity of the field being measured when the instrument is not present. In view of the fact that the determination of K E by means of calculations is extremely complicated and is accomplished only for bodies of the simplest shape such as a sphere and an ellipsoid, it is convenient to investigate K E experimentally by means of portable meters, especially as described in [4-6]. The indication ~ of these instruments is proportional to the field intensity at the surface of their measuring electrodes:
where m is the transfer factor of the meter.
Q ~E . ~ : I ~ xKE~A Eg/E
#
fl
3 I#
2# 30
-~#4cm
Fig. i
a
7
I
1
3
I
5 ~/R b
Fig. 2
Translated from Izmeritel'naya Tekhnika, No, 5, pp, 61-63, May, 1978. 0543-1972/78/2105-0685507.50
9 1978 Plenum P
Data Loading...
