Vibration influence Sample Clauses

Vibration influence. It was believed that vibrations in the antenna would cause modulation that could interfere with actual signals. To invetsigate this matter, a laboratory measurement was performed in the frame- work of the ePellet project. In the experiment, an RFID reader (XXXXX B4200) and a 6x9 cm coil antenna supplied by ElectroTech was used for generating the powering magnetic field. The signal driving the coil and the voltage at the parallel resonant node were probed and connected to the inputs of a BasicRX board in an Ettus N200 digitizer. The sampled signal was decimated to a 195kHz bandwidth around 125 kHz and further processed using Matlab. In order to simulate the effects of a vibrating antenna or vibrating conducting materials in the vicinity of the antenna an 18x22 cm aluminum plate was attached to a loudspeaker. The mechanical resonant frequency of the system of 170 Hz was used for subsequent tests. The plate was approximately 5 cm from the center of the coil antenna. The setup is shown in 11 and 12. Figure 13 shows the average modulation spectra around 125 kHz without tag, with a tag close to the antenna and with the aluminum plate vibrating. This spectrum was calculated as the power Stationary In motion −65 −70 −75 −80 Signal level (dBA/m) −85 −90 −95 −100 −105 −110 −115 −120 0 0.5 1 1.5 2 2.5 3 Frequency (Hz) x 106 Figure 8: Zoomed view of the frequency range showing the greatest ambient magnetic field levels. average of 100 fourier transforms of the ratio of the voltage at the parallel resonant node to the output voltage of the driver. It should be noted that while the plate was vibrating the detection range of the receive circuit of the reader decreased from about 7 cm to about 1 cm when using the tag shown in Fig. 14.
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