I'm looking for a miniature titanium ultrasonic probe (The diameter of the probe is less than 1 mm) for A-scanning of metals such as cooper or brass

this probe must be inserted into a hole with a diameter of less than one millimetre, which the material of the bottom surface of this hole is metal with a thickness of a few centimetres.

Can anyone introduce me to a product or article on this topic?

The scan direction is perpendicular to the direction of movement of the probe, that is, in contrast to the direction of scanning conventional probes, which is in the same direction of the probe movement.