Aiming at the requirement of electrolyte density measurement for aviation batteries

a digital liquid densitometer is designed.The system including four parts of sampling

vibration

signal processing and operation display.Among them

the sampling module uses peristaltic pump to complete automatic injection of liquid to be measured; the vibration module uses electromagnetic excitation to achieve resonance; the signal processing module takes MCU as the core

adjusts the amplitude and phase of the excitation signal automatically

then obtains resonance frequency and calculates liquid density; the operation display module realizes human-machine interaction and result display through the touch screen.The experimental data show that the selection of key components parameters is reasonable.The maximum absolute error of measurement is 0.002 g/cm~3 within the designed range

which can meet the maintenance needs of aviation batteries.