Matko Vojko, Milanović Miro
Institute for Automation, Faculty of Electrical Engineering and Computer Science, University of Maribor, Smetanova 17, Maribor 2000, Slovenia.
Institute for Robotics, Faculty of Electrical Engineering and Computer Science, University of Maribor, Smetanova 17, Maribor 2000, Slovenia.
Sensors (Basel). 2016 Jun 28;16(7):995. doi: 10.3390/s16070995.
A new method for the automated measurement of the hysteresis of the temperature-compensated inductance-to-frequency converter with a single quartz crystal is proposed. The new idea behind this method is a converter with two programmable analog switches enabling the automated measurement of the converter hysteresis, as well as the temperature compensation of the quartz crystal and any other circuit element. Also used is the programmable timing control device that allows the selection of different oscillating frequencies. In the proposed programmable method two different inductances connected in series to the quartz crystal are switched in a short time sequence, compensating the crystal's natural temperature characteristics (in the temperature range between 0 and 50 °C). The procedure allows for the measurement of the converter hysteresis at various values of capacitance connected in parallel with the quartz crystal for the converter sensitivity setting at selected inductance. It, furthermore, enables the measurement of hysteresis at various values of inductance at selected parallel capacitance (sensitivity) connected to the quartz crystal. The article shows that the proposed hysteresis measurement of the converter, which converts the inductance in the range between 95 and 100 μH to a frequency in the range between 1 and 200 kHz, has only 7 × 10(-13) frequency instability (during the temperature change between 0 and 50 °C) with a maximum 1 × 10(-11) hysteresis frequency difference.
提出了一种用于自动测量具有单个石英晶体的温度补偿电感 - 频率转换器磁滞的新方法。该方法背后的新思路是一种带有两个可编程模拟开关的转换器，它能够自动测量转换器的磁滞，以及对石英晶体和任何其他电路元件进行温度补偿。还使用了可编程定时控制装置，该装置允许选择不同的振荡频率。在所提出的可编程方法中，与石英晶体串联连接的两个不同电感在短时间序列中进行切换，以补偿晶体的自然温度特性（在0至50°C的温度范围内）。该过程允许在与石英晶体并联连接的不同电容值下测量转换器的磁滞，以便在选定电感下设置转换器灵敏度。此外，它还能在连接到石英晶体的选定并联电容（灵敏度）下，在不同电感值下测量磁滞。文章表明，所提出的将95至100μH范围内的电感转换为1至200kHz范围内频率的转换器磁滞测量方法，在0至50°C的温度变化期间，频率不稳定性仅为7×10^(-13)，最大磁滞频率差为1×10^(-11)。
