A measurement system for capturing a transit time, phase, or frequency of energy waves propagating through a propagation medium is disclosed. The measurement system comprises a compressible waveguide (403), ultrasonic transducers (405, 406), and circuitry to sustain energy wave propagation in the waveguide (403). The circuitry includes a propagation tuned oscillator (404), a digital counter (409), a pulse generator (410), a phase detector (414), a counter (420), a digital timer (422), and a data register (424). The measurement system employs a continuous mode (CM), pulse mode, or pulse-echo mode of operation to evaluate propagation characteristics of continuous ultrasonic waves in the waveguide by way of closed-loop feedback to determine levels of applied forces on the waveguide.
