alpha 28[deg] "Transducer position angle"
W 20[mm] "Wedge width"
H 10[mm] "Wedge height"
L 12[mm] "Wedge lateral side length"
D 9[mm] "Transducer diameter"
H_pzt 1.55[mm] "Piezoelectric crystal height"
H_match 0.56[mm] "Matching layer height"
W_ts 100[mm] "Test sample width"
H_ts 15[mm] "Test sample height"