Dielectric constant measurement circuit based on RLC series resonance circuit and method thereof
A series resonant circuit and dielectric constant technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., can solve the problems of complex measurement methods and high measurement costs, and achieve low measurement costs and simple measurement methods Effect
Inactive Publication Date: 2015-11-25
YANAN UNIV
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[0003] The purpose of the present invention is to provide a kind of circuit based on RLC series resonant circuit to measure dielectric constant, which solves the problem that existing dielectric constant measurement method has complicated measurement method and high measurement cost
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[0065]Put the parallel plate capacitor into distilled water, adjust the inductance L to 10mH, adjust the resistance R to 30Ω, connect the moving end of the single-pole double-throw switch S to the fixed end B, and adjust the voltage output amplitude of the power supply XF until AC milliseconds The voltage value U on the voltmeter V is displayed as 1, then connect the moving end of the SPDT switch to the non-moving end A, adjust the frequency meter f, and observe the voltage change at both ends of the resistor R, when the voltage on the AC millivolt meter V is When the maximum value is displayed, the frequency value on the frequency meter f at this time is the resonant frequency f of the resonant circuit 0 , use a vernier caliper to measure the radius r of the two plates of the parallel plate capacitor and the distance d between the two plates, and substitute the corresponding data into the formula (4) to calculate the dielectric constant of distilled water. The relevant data of...
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The invention discloses a dielectric constant measurement circuit based on an RLC series resonance circuit. The dielectric constant measurement circuit comprises a parallel plate capacitor C. An electric inductor L, a resistor R' and one end of a resistor R are connected on one plate of the parallel plate capacitor C in turn. The fixed end A of a single-pole double-throw switch S is connected between the resistor R and the resistor R'. The fixed end B of the single-pole double-throw switch S is connected with one end of an AC voltmeter V. The other end of the AC voltmeter V and the other end of the resistor R are grounded. The other plate of the parallel plate capacitor is respectively connected with the moving end of the single-pole double-throw switch S, one end of a frequency meter f and one end of a power supply XF. The other end of the frequency meter f and the other end of the power supply XF are grounded. With application of a method of the dielectric constant measurement circuit, an equivalent relationship of solving the capacitance value of the parallel plate capacitor C is constructed when the circuit reaches the resonance state, a calculation formula for measuring the dielectric constant epsilon is deduced, and the dielectric constant epsilon is indirectly measured. The adopted measurement method is simple and measurement cost is relatively low.
Description
technical field [0001] The invention belongs to the technical field of dielectric permittivity measurement, and relates to a circuit for measuring the permittivity based on an RLC series resonant circuit, and also relates to a method for measuring the permittivity by using the circuit. Background technique [0002] Dielectric constant, also known as permittivity or relative permittivity, is an important data that characterizes the electrical properties of dielectric or insulating materials. It refers to the ratio of the capacitance when the same substance is used as the dielectric and vacuum in the same capacitor, indicating the relative ability of the dielectric to store electrostatic energy in the electric field. The smaller the relative permittivity, the better the insulation. Due to the continuous development of electronic engineering, the use of capacitance, the basic component in the circuit, is becoming more and more frequent. It is often necessary to measure the valu...
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Inventor 刘艳峰
Owner YANAN UNIV