.inspection .systems.monitor.the.fron
t-wall.and.the.back-wall echoes.in.order.to.measur e.the.tube. ...
wall.thickness the.internal.rotary.inspe ction.system ... es.in.pulse-echo.mode.to.
measure.wall.thickness material.loss and.defect orientation. ... norm al incidence.wave.on.the.int
ernal.wall.of.the.tube because.the.mirror.revolv es.about.the ...