NON DESTRUCTIVE TEST

Calculate the maximum limit of focus for a $16$ element $1$D linear phased array probe without a wedge, given the following parameters:

Frequency $10$ MHz

Pitch $0\mathrm{.}31$ mm

Longitudinal velocity $5\mathrm{.}96$ mm$/$s

a$\mathrm{.}17\mathrm{.}3$ mm

b$\mathrm{.}10\mathrm{.}3$ mm

c$\mathrm{.}20\mathrm{.}6$ mm

d$\mathrm{.}15\mathrm{.}3$ mm