Low Level Ionic Current Sensing Micro-Tip

Many of the existing fingerprint biometric sensors have limitations with regard to liveness detection. At Brunel University research is being pursued with a view to developing novel fingerprint sensor based on micro/nano technology. In this paper, we report work in progress of a micro sensor capable of detecting ionic activity of sweat pores on a finger ridge. The multi-physics modeling software (COMSOL) was used to create an electrical model of the sensor and its response to charge coupling in conducting liquid was simulated. The experimental results obtained under various operating conditions agreed well with the simulation results.