| http://www.w3.org/ns/prov#value | - However, phase-shifting interferometers require several phase-shifts in the reference beam to obtain the measurement i.e. see for example Gallagher 3,694,088, and the time required to generate multiple phase-shift readings, until the present invention, would prevent the use of phase-shifting interferometers to measure the surface movement of an object in response to an ultrasonic wave induced ther
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