Embedded System for Ultrasound Emissions Acquisition and Processing

U okviru rada dizajniran je sustav za akviziciju i obradu ultrazvučnih signala. Mjerni sustav radi sa signalima u rasponu frekvencija 15 kHz do 580 kHz te do razine signala 180 mV. Mjerni sustav sastoji se od nabojskog pojačala, detektora razine signala i mikrokontrolera MSP430FR5994. Mjerni sustav radi tako da pojačani signal dovodimo na ulaz A/D pretvornika, a zatim te uzorke dobivene pomoću A/D pretvornika koristimo kako bismo računali FFT na mikrokontorleru. Rezultate FFT algoritma spremamo na microSD memorijsku karticu. Nabojsko pojačalo zajedno s detektorom razine troši 3,18 mA uz napon 5 V, dok mikrokontroler troši 5,48 mA uz napon 5 V.System for acquisition and processing of ultrasound signals was designed and tested. The measuring system works with signals ranging from 15 kHz to 580 kHz and an amplitude of 180 mV. The measuring system consists of a charge amplifier, comparator and microcontroller MSP430FR5994. Amplified signals are coming to A/D converter input and then that samples obtained using the A/D converter are used to compute the FFT on the microcontroller. The result of the FFT algorithm is stored on the microSD memory card. Charge amplifier together with the detector consumes 3.18 mA at 5 V, while the microcontroller consumes 5.48 mA at 5 V