Abstract
By comparing the advantages and disadvantages of various dust measurement methods, the oscillating balance method is chosen to measure dust. According to the measuring principle of the oscillating balance method, a particle weighing device based on the oscillating balance method is developed. The device avoids the interference of temperature, humidity and mutual inductance to the magneto-electric speed sensor, improves the amplitude of the magneto-electric speed sensor to receive the oscillation signal, and improves the signal-to-noise ratio of the system as much as possible. According to the phase-frequency characteristics of the oscillating system, an overall structure of the system is designed. The system consists of a drive module, harmonic oscillator, measurement module, and phase-locked loop automatic phase modulation circuit and frequency measurement module. These five modules constitute a system that can automatically adjust the natural frequency. And the list confirms the accuracy of the frequency that is measured by FPGA and STM32 processor. The dust mass is calculated according to the formula. Finally, the reliability of the device is confirmed by a parallel comparison with the internationally recognized filter membrane weighing method. The reliability of the device is confirmed.
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