THRESHOLD SENSITIVITY OF QUARTZ TORSION MAGNETOMETERS ON A BASE OF VICALLOY AND SAMARIUM-COBALT
Abstract and keywords
Abstract (English):
Extremely achievable parameters of quartz torsion variometer magnetometers are investigated. Influence of instability and noise of the opto-electronic converter on a threshold of sensitivity of a magnetometer with the negative feedback (NF) is considered and extreme values of a sensitivity threshold of the magnetometer are estimated for different magnetic materials used, depths of NF and the demanded frequency range of measurements. Criteria for optimization of the sizes and a form of the magnets are determined by a condition of a maximum relation of the magnetic moment to the moment of inertia. Theoretical and experimental estimates of noise level of magnetometers on a base of vicalloy and samarium-cobalt are given. It is shown that for threshold sensitivity of the magnetometer about 1~pT, the frequency range of the magnetometer with a sensor on a base of vicalloy is limited by a frequency about 1.6~Hz, samarium-cobalt -- 6.4~Hz. The received values of a frequency and threshold sensitivity for the specified magnetic materials completely meet the requirements of Intermaget for one-second data and are probably the extreme values for quartz variometers with the opto-electronic converter of angular movements.

Keywords:
Quartz magnetic variometer, sensitivity, frequency range
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References

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