Electrokinetic experiments of porous transducer in liquid circular angular accelerometer

This paper is aimed to improve the accuracy and bandwidth of liquid circular angular accelerometer through analyzing the electrokinetic property of the embedded porous transducer. The transducer sintered by glass microspheres is utilized to measure the streaming potential and the streaming current in the sensor. By using SurPASS, a series of electrokinetic experiments are conducted on different transducer samples. We show that the streaming potential coupling coefficient (SPC) and streaming current coupling coefficient (SCC) can be calculated from the measured streaming potentials and streaming currents for solvent with different concentration, pH, and ion species and for porous transducers with different permeability. The further experimental results show that these two coefficients decrease as the conductivity increases while they increase with the increasing permeability. In addition, we also show that the surface conductance is more influential than the solution conductivity at the low solution salinity. This electrokinetic study is beneficial to select the suitable porous transducer and solvent such that the SPC or SCC is high, which contributes to improving the detection of weak signals, obviously increasing the accuracy of accelerometer and expanding the bandwidth.