Re[Zs(ω)]=Re[Zt(ω)]−Re[Zc(ω)] Equation (12) and Im[Zs(ω)]=Im[Zt(ω)]−Im[Zc(ω)] Equation (13) where subscript “t” indicates total complex impedance, “s” indicates sensor element impedance, and “c” indicates coil impedance."/>
Impedance analysis technique for frequency domain characterization of magnetoelastic sensor element by measuring steady-state vibration of element while undergoing constant sine-wave excitation
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Impedance analysis technique for frequency domain characterization of magnetoelastic sensor element by measuring steady-state vibration of element while undergoing constant sine-wave excitation
Impedance analysis technique for frequency domain characterization of magnetoelastic sensor element by measuring steady-state vibration of element while undergoing constant sine-wave excitation
Circuitry and program code adapted for carrying out an associated technique for characterizing the response of one or more magnetoelastic sensor elements during exposure to an excitation field generated by an interrogation coil: including: (a) measuring a total sensor signal from the coil with the sensor element positioned within the excitation field within a spacing created by a winding of the coil; and (b) automatically determining: (i) a total measured impedance spectrum from said total sensor signal so measured, and (ii) a plurality of magnitude values representing the real part of a reconstructed impedance spectrum for the sensor element. The reconstructed impedance spectrum for the sensor element, having been calculated by subtracting an impedance generally attributable to the coil during the time an AC excitation signal is provided, from the total measured impedance. Subtraction of coil impedance from total complex impedance is accomplished by separate subtraction of the real part and of the imaginary part, represented as follows Re[Zs(ω)]=Re[Zt(ω)]−Re[Zc(ω)] Equation (12) and Im[Zs(ω)]=Im[Zt(ω)]−Im[Zc(ω)] Equation (13) where subscript “t” indicates total complex impedance, “s” indicates sensor element impedance, and “c” indicates coil impedance.
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机译:适于执行一种相关技术的电路和程序代码,该技术用于表征一个或多个磁弹性传感器元件在暴露于询问线圈产生的激励场期间的响应:包括:(a)用传感器测量来自线圈的总传感器信号位于由线圈绕组产生的间隔内的励磁场内的元件; (b)自动确定:(i)从如此测量的所述总传感器信号中确定总测量阻抗谱,以及(ii)代表传感器元件的重建阻抗谱实部的多个幅值。通过从总的测量阻抗中减去在提供AC激励信号期间通常归因于线圈的阻抗来计算出传感器元件的重建阻抗谱。从总复阻抗中减去线圈阻抗是通过分别减去实部和虚部来实现的,如下所示<?in-line-formulae description =“在线公式” end =“ lead”?> Re [Z I> s Sub>(ω)] = Re [ Z I> t Sub>(ω)]- Re [Z I> c Sub>(ω)]方程(12)<?公式description =“ In-line公式” end =“ tail”?> <?in-line-formulae description =“ In-line公式” end =“ lead”?>和<?in-line-formulae description =“ In -line Formulae“ end =” tail“?> <?in-line-formulae description =” In-line Formulae“ end =” lead“?> Im [Z I> s Sub >(ω)] = Im [Z I> t Sub>(ω)]- Im [Z I> c Sub>(ω) ]公式(13)<?in-line-formulae description =“ In-line Formulae” end =“ tail”?>下标“ t”表示总复数阻抗,“ s”表示传感器元件阻抗,“ c”表示线圈阻抗。
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