A method and system for detecting the resonant frequency of a low-q-value saw magnetoelectric sensor
A magnetoelectric sensor, resonant frequency technology, applied in frequency measurement devices, instruments, measurement devices, etc., can solve the problems of low accuracy, poor stability, narrow frequency detection range, etc., to reduce processing pressure, reduce relative errors, The effect of improving measurement accuracy
Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a detection method and system for the resonant frequency of a low-Q SAW magnetoelectric sensor, thereby solving the existing frequency detection of the low-Q SAW magnetoelectric sensor in the prior art Technical issues with narrower range, less stability and less accuracy
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[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0046] Such as figure 1 As shown, the resonator voltage measurement circuit, R 1 and R 2 For two voltage divider resistors, the size relationship maintained is R 2 ≤R 1 / 10;Y 1 is the SAW magnetoelectric sensor; R z It is an impedance matching network, and its impedance value is slightly smaller than the equivalent resistance value of the SAW magnetoelectric sensor. R z The voltage across...
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The invention discloses a method and system for detecting a resonant frequency of a low-Q-value SAW magneto-electric sensor. The method comprises: carrying out frequency sweeping on a low-Q-value SAWmagneto-electric sensor under high-frequency excitation to obtain an opening voltage signal and a closing voltage signal of each frequency point, carrying out mixing, filtering, and analog-digital conversion on the opening voltage signals and closing voltage signals successively to obtain digital signals; and calculating a voltage ratio of each frequency point by using preprocessed digital signalsand using a frequency corresponding to the frequency point with the maximum voltage ratio as a e resonant frequency of the low-Q-value SAW magneto-electric sensor. The method has advantages of wide range, good stability and high accuracy for resonant frequency detection of the low-Q-value SAW magneto-electric sensor.
Description
technical field [0001] The invention belongs to the field of surface wave (SAW) magnetoelectric sensor signal detection, and more specifically relates to a detection method and system for low-Q value SAW magnetoelectric sensor resonance frequency. Background technique [0002] SAW magnetoelectric sensor is a kind of magnetic sensor that prepares magnetostrictive material on piezoelectric SAW device and uses the change of resonance frequency to measure magnetic field. It has the advantages of small size, low power consumption and high sensitivity. The resonant frequency is an important parameter of the SAW magnetoelectric sensor. After detecting the resonant frequency and finding the corresponding function relationship between the resonant frequency and the external magnetic field, the magnetic field variation can be obtained indirectly. The detection of the resonant frequency needs to meet the requirements of four aspects: wide frequency detection range, fast speed, high acc...
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IPC IPC(8): G01R23/02G01R33/10
CPCG01R23/02G01R33/10
Inventor 杨晓非罗飞欧阳君李杨童贝陈实
Owner HUAZHONG UNIV OF SCI & TECH