We present the results of testing a device for grading glass plates for liquid-crystal displays and monitoring the thickness of a ribbon of window glass during its manufacture. The capacitive method used provides highly accurate and contactless real-time measurements.
A brief description is given of a capacitive device for measuring the parameters of the electrical insulation of conductors during their production on an extrusion press.The performance of electrical equipment depends to a large extent on the parameters of the conductors that are used (in particular, on the thickness of the insulating coating, the diameter of the conductor, and the displacement of the conductor from the center of the press). This is especially true of equipment that is subject to continual changes in environmental conditions -temperature, humidity, chemical attack. An analysis of the literature data showed that the quality of electrical equipment can be improved significantly by making noncontact measurements of the parameters of the conductors during their manufacture. Of all of the available methods, the capacitive method seems the most convenient. Its speed, accuracy, and universality and its relative simplicity and reliability has allowed it to gradually take the place of traditional optical and contact methods.In designing primary sensors for instruments to measure the parameters of conductors, we drew on experience gained in the measurement of the diameter of dielectric fibers [1]. In particular, mathematical modeling was used in the design process. The electrical circuit was left essentially unchanged.The primary sensors ( Fig. 1) of the instruments designed to measure the diameter of the conductor (CDR) 1, the quality of the electrical insulation (EI) 2, the displacement of the CDR, and the thickness of the EI 6 were built into the extrusion press used to make the conductor. In tests of the system, the operator used the readings of the first two devices to evaluate the condition of the raw materials and adjust the unit in accordance with specifications. The readings of the conductor displacement meter were used to center the head of the extruder. The signals obtained from these transducers made it possible to monitor the quality of the insulation and, when necessary, alter extrusion rate or temperature so as to obtain the specified conductor parameters.The design of the El transducers is similar to that described in [1]. A I.ampard capacitor was chosen as the transducer for measuring CDR diameter and EI thickness because of its stability under production conditions. In order to satisfy the requirements imposed regarding measurement over a small interval, we proposed a variant of Lampard capacitor which has a short low-potential electrode of length l placed in the channel of a guard electrode with the gap ~.The effect of the geometric parameters of the transducers on measurement accuracy was taken into account by calculating the nonuniformity of field strength in their working regions, expressed through the coefficient K(D, L, l, /~). The effect of other factors was accounted for by introducing the corresponding relations into the formulas used in the design process. For example, temperature, relative humidity, and atmospheric pressure were taken into account through the relation for the p...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.