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
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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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