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Method for optimization selection of proton magnetometer matching capacitor

A technology of matching capacitors and optimizing selection, which is applied in the direction of electric/magnetic exploration, instruments, scientific instruments, etc., and can solve problems such as quality deterioration

Inactive Publication Date: 2014-08-20
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for optimizing the selection of the tuning capacitor, which can effectively solve the problem that some frequency points are not within the bandwidth of the tuning circuit due to the error of the capacitance value, resulting in poor quality, and ensure that any signal to be tested quality, thereby improving the measurement accuracy of the proton magnetometer

Method used

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  • Method for optimization selection of proton magnetometer matching capacitor
  • Method for optimization selection of proton magnetometer matching capacitor
  • Method for optimization selection of proton magnetometer matching capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Embodiment 1: Low Q value matching circuit system

[0083] The magnetic field measurement range of the proton precession magnetometer is 20000nT~90000nT, and the frequency measurement range is 850~3830Hz. The inductance L of the probe is 17.4mH, the internal resistance r of the probe is 5.9Ω, the matching resistance R is 1KΩ, the matching capacitor uses a corrected polypropylene capacitor, and the error is ±5%.

[0084] 1. Determine the fixed minimum capacitance C min . According to the maximum measurement range of the magnetic field of 90000nT, the fixed minimum capacitance C is obtained min is 100nF, it is always connected with the matching circuit.

[0085] 2. Determine the matching capacitor controlled by the switch in the matching circuit.

[0086] (a) Determine the matching capacitor C 1 : with the matching capacitor C 1 The associated two adjacent matching capacitors are C min with C min +C 1 . C min is the smaller value of the adjacent capacitors, and...

Embodiment 2

[0095] Embodiment 2: High Q value, high inductance, low power consumption matching circuit system

[0096]The magnetic field measurement range of the proton precession magnetometer is 20000nT~90000nT, and the frequency measurement range is 850~3830Hz. The inductance L of the probe is 35mH, the internal resistance r of the probe is 20Ω, the matching resistance R is 10KΩ, the matching capacitor uses a corrected polypropylene capacitor, and the error is ±3%.

[0097] 1. Determine the fixed minimum capacitance C min . According to the maximum measurement range of the magnetic field of 90000nT, the fixed minimum capacitance C is obtained min For 49.3nF, it is always connected with the matching circuit.

[0098] 2. Determine the matching capacitor controlled by the switch in the matching circuit.

[0099] (a) Determine the matching capacitor C 1 : with the matching capacitor C 1 The associated two adjacent matching capacitors are C min with C min +C 1 . C min It is the sm...

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Abstract

The invention discloses a method for optimization selection of a proton magnetometer matching capacitor, and belongs to the technical field of magnetic field intensity detection. The method for optimization selection of the matching capacitor comprises the processes of determining matching circuit system parameters, determining the fixed minimum capacitance Cmin and gradually determining the matching capacitor. The method for optimization selection of the matching capacitor according to the matching circuit bandwidth is provided under the condition that certain frequency points are not located within the bandwidth of a matching circuit due to limited capacitor combination and matching, and the whole matching circuit bandwidth can cover the whole system bandwidth. Meanwhile, the matching method for the circuit with capacitance errors is obtained through analysis under the condition that the errors exist between actual capacitance and ideal capacitance, and the problem that due to matching frequency emission offset caused by the capacitor capacitance value errors, certain frequency points are not within the circuit bandwidth range is solved. According to the method, the matching capacitor can be selected according to different measuring ranges, and the precision of later measuring signals is improved.

Description

technical field [0001] The invention belongs to the technical field of magnetic field strength detection, and specifically relates to a method for optimally selecting a matching capacitor for a proton precession magnetometer used for weak magnetic field measurement, which can solve the problem of signal quality caused by certain frequency points not within the bandwidth of the matching circuit Variation problem. technical background [0002] The proton precession magnetometer is made using the principle of hydrogen proton precession in a magnetic field, and is used to measure the total strength of the geomagnetic field (see reference J.A. Koehler, "Proton Precession Magnetometer", Rev2Comox, BC, Canada, November 2004.) . It is a high-precision magnetometer that can sense weak changes in the Earth's magnetic field. Since the 1950s, proton precession magnetometers have developed rapidly and are widely used in geological exploration, earthquake prediction, daily change monito...

Claims

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Application Information

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IPC IPC(8): G01V3/40
Inventor 陈曙东张爽顾玲嘉
Owner JILIN UNIV
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