Concentration detection in water-glucose mixtures for medical applications using ultrasonic velocity measurements

This paper presents the possibility to measure the blood sugar content detecting different ultrasonic velocities in water-glucose mixtures by using two ultrasonic transducers. With the transmission-trough technique and a fixed transducer distance the required wave propagation time can be measured precisely. The ultrasonic actor transducer, excited at the same frequency of f = 2 MHz during different mixtures, uses a burst signal to separate reflections from the direct path. With this technique a very sensitive glucose-water concentration of less than 30 mg/dl can be separated.