In order to evaluate IUT as a receiver for a high repetition
low power pulsed laser a laserIn order to evaluate IUT as a receiver for a high repetition
low power pulsed laser a laser
was used to generate the ultrasound. The lasers with high
pulse repetition rate would produce ultrasonic images in a
shorter time frame [11–14]. The sample was an IUT made
of a 51 µm thick PZT-c film deposited onto a 12.7 mm thick
steel plate. The top electrode of this IUT was 6 mm in diam-
eter. As previously, the laser generation location was on the
opposite side of the IUT on the steel substrate. The laser
spot size is 0.5 mm and the generation is in the ablation
regime. Figures 4a and 4b show the received ultrasonic sig-
nals averaged over 100 laser shot at room temperature and
150 ◦C, respectively. The averaging of 100 laser pulses is
used to reduce the electrical noises of the current experimen-
tal setup. The center frequencies and bandwidths of the echo
L 1 , shown in Figs. 4a and 4b are 19.5 MHz & 19.4 MHz and
14.5 MHz & 11.4 MHz, respectively. The SNR at 150 ◦C is
lower than that at room temperature mainly due to the IUT
receiver better ultrasonic performance at room temperature
than at 150 ◦C. Figures 4a and 4b show that IUT made of
PZT-c film is capable to be an ultrasonic receiver for laser
generated ultrasound using this high repetition pulsed laser
up to at least 150 ◦C.