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Maxwell bridge

About: Maxwell bridge is a research topic. Over the lifetime, 22 publications have been published within this topic receiving 169 citations.

Papers
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Proceedings ArticleDOI
28 May 2015
TL;DR: In this paper, an electro-optic type flow transmitter has been proposed, which converts the float movement of Rotameter into an electrical signal with the help of inductive pickup coil and Maxwell Bridge.
Abstract: The Rotameter is a variable area, local indicator type flow sensor. Hence to transmit reading of Rotameter at a remote distance, some special technique is needed. The transmission of electrical signal is dangerous for inflammable industry. In this paper, an electro-optic type flow transmitter has been proposed. The float movement of Rotameter is converted into an electrical signal with the help of inductive pickup coil and Maxwell Bridge. This electrical signal is applied in electro-optic Mach-zehnder Interferometer, which gives the optical signal for transmitting to remote location. The necessary theoretical equations, along with the experimental results are reported in this paper.

3 citations

Patent
19 Sep 1991
TL;DR: In this paper, the phase detector 38 detects the phase of the output signal of the oscillator 30, i.e. the exciting current for the detecting coil 14 and the coil 16, and then the signal corresponding to the difference between both phases is outputted.
Abstract: PURPOSE:To make it possible to perform detection even if a heterogeneous layer is orthogonal to a measuring surface by tilting a probe for applying a magnetic field on a material to be measured with respect to the detecting surface of the surface to be measured. CONSTITUTION:In a detecting part 10, a Maxwell bridge is constituted of a detecting coil 14 of a probe 12, a correcting coil 16 and a pair of resistors 18 and 20. A bobbin 22 supports the coil 14 so that the coil 14 is tilted with respect to a detecting surface 26 of a material to be measured 24. The magnetic flux generated in the coil 14 is obliquely inputted into the detecting surface 26. One end of each of the coils 14 and 16 is connected to the output side of an amplifier 32 for amplifying the output of an oscillator 30. The other ends are connected to the resistors 18 and 20 and the input side of an amplifier 36. The amplifier 36 amplifies the output of the Maxwell bridge. The amplified signal is inputted into a phase detector 38 together with the output signal of the oscillator 30. The detector 38 detects the phase of the output signal of the oscillator 30, i.e. the exciting current for the coil 14 and the coil 16, and the phase of the output signal of the Maxwell bridge. The signal corresponding to the difference between both phases is outputted.

2 citations

Journal ArticleDOI
TL;DR: In this article, a two-layer symmetric balanced coil array with a serial-resonance Maxwell bridge was proposed to detect metallic foreign objects between the transmitter and receiver coils.
Abstract: In a wireless high-power transfer system with a distance of several tens of centimeters apart between the transmitter and receiver coils, one of the most challenging issues is to detect metallic foreign objects between the transmitter and receiver coils. The metallic foreign objects must be detected and removed since these reduce the transmission efficiency and cause heat generation of the transmitter and receiver. This paper presents two-layer symmetric balanced coil array so that if there are metallic foreign objects, it can be detected through the change of the inductance of the balanced coils. Since the balanced coil is composed of coils that are in a symmetrical relationship in position, there is no need for a reference coil, and interference between coils is reduced by dividing the coil into two layers. In addition, a novel serial-resonance Maxwell bridge circuit to improve the inductance change detection performance is presented in this paper. The proposed metallic foreign object detection system is implemented using two-layer balanced coil array with a serial-resonance Maxwell bridge and the experimental results show that voltage changes of hundreds of mV to several V occur when a metallic foreign object is inserted, so that even small metals such as clips can be detected.

2 citations

Journal ArticleDOI
TL;DR: In this article, a method was described for high resistance measurement which depends essentially on the fact that a small capacitance C, charged and discharged n times per second, is equivalent to a high resistance 1/nC ohms if the pulsating current is smoothed by a larger capacitance.
Abstract: A method is described for high resistance measurement which depends essentially on the fact that a small capacitance C, charged and discharged n times per second, is equivalent to a high resistance 1/nC ohms if the pulsating current is smoothed by a larger capacitance. Upon placing the ``equivalent high resistance 1/nC'' and unknown high resistance R, in two arms of a Maxwell bridge, it is shown that at balance, R is given by the familiar bridge equation: R=(1/nC)R1/R2. The method has been used to check the constancy of several electrolytic resistors three years old. It was found, for a resistance of the order of 108 ohms, that no change was detectable within 0.1 percent; for resistors of the order of 1010 ohms, a decrease of about 3 percent was noted.

2 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20202
20151
20141
20132
20121
20101