SU951189A1 - Device for continuous measuring of electrostatic field strength - Google Patents

Description

The invention relates to electrical measuring technology and is designed to continuously measure the strength of an electrostatic field generated by electrostatic charges, and can be used in all industries of the industry, where the electrification of recycled materials takes place in the implementation of technological processes.

Devices for measuring electrostatic field strength are known, consisting of a measuring electrode, a sensor, an amplifier, and a recording switch instrument that operates according to the principle of inducing an electrostatic charge on a measuring electrode proportional to the field strength at the measuring point and the density of electrostatic charge on the object . If there is an induced charge on the measuring electrode, the anode current of the electrometric lamp is changed, which is a sensor, the received signal is amplified and measured by the indicating device 1.

 The disadvantages of this invention are the inability to provide continuous measurements, due to the saturation of the measuring electrode

which significantly distorts the measurement results; limited distance; low noise immunity and accuracy; analog output. The closest technical solution to the present invention is a device for measuring the strength of an electrostatic field, comprising a measuring electrode, a sensor,

10 amplifier recording instrument and modulating plate. A charge is induced on the measuring electrode by an external electrostatic field; modulating plate located in front of

15 By a measuring electrode, it rotates at a frequency of about 1000 Hz (which is necessary to ensure favorable operating conditions of the AC amplifier) and modulates the field. This allows continuous measurements. At the output of the sensor (electrometric lamp), an alternating voltage of -1 appears, which is fed to the input of the electronic amplifier, and then registered with a pointer device 2.

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Significant drawbacks of this type of device are: the need for screen rotation with a high speed electromechanical drive d (limited reliability) for obtaining 30

Claims (2)

Neither modulation with a frequency of about 1000 Hz is the reception of an analog signal at the output, which makes it difficult to use these devices in process control systems, limited distance, and low accuracy and noise immunity. The purpose of the invention is to improve measurement accuracy, reliability, and device simplification. The goal is achieved by the fact that in a device for continuous measurement of the electrostatic field strength, containing a sensor and a recording device, the sensor is designed as an electrical voltage converter into a pulse signal, the output of which includes a recording device and a movable screen located in front of the measuring electrode. In addition, the converter is made in the form of two electrodes, between which a conducting particle is observed in a dielectric medium. The drawing shows a device for continuously measuring the strength of an electrostatic field. The device comprises a housing 1, an electrode 2, a conducting particle 3, a measuring electrode 4, a movable screen 5, a screen drive 6, a resistor 7. The space between the electrodes is filled with a dielectric liquid 8. A digital frequency meter 9 is used as a recording device. in a way. When a sensor is introduced into the electric field, a charge is indicated on the measuring electrode, due to which a potential difference is created between the sensor electrodes, and the conducting particle 3 begins to oscillate, the frequency of which is proportional to the field strength. The input of the frequency meter 9 receives pulses that are recorded in digital form. Due to the fact that screen shifts are only necessary for periodic shielding of the measuring electrode from the measured field in order to avoid saturation, the frequency of the movements is low, about 1 Hz, which significantly increases the reliability of the proposed device. Claim 1. A device for continuous measurement of the electrostatic field strength, comprising a sensor and a recording device, characterized in that, in order to improve the measurement accuracy, reliability and simplification of the device, the sensor is designed as a converter, an electrical voltage. the output of which included a recording device and introduced a movable screen located in front of the measuring electrode. 2. The device according to claim 1, wherein the transducer is made in the form of two electrodes, between which there is a conductive particle in a dielectric medium. Sources of information taken into account in the examination 1. Rubber and rubber / 1969, 7, p.55-57. 2. Textile industry, 1969, 9, pp.56-57.