Measuring equipment for acoustic determination of the specific gravity of liquids

Claim 1

A measuring probe for the acoustic determination of the specific gravity of a liquid, comprising, a holder having a piezoelectric ceramic disc attached at one end thereof and a parallel arranged reflection disc attached at the other end thereof, a reference element having parallel end faces and a known acoustical impedance, said reference element having one of said end faces in abutting engagement with said piezoelectric disc and the other of said end faces in spaced relation to said reflection disc to form a sampling space therebetween, said reference element having an annularly shaped groove formed therein intermedite said end faces and having a planar surface adjacent to and parallel to said ceramic disc, said holder having wall means bounding and surrounding said annular groove, and said wall means forming an opening to provide ingress and egress to and from said sampling space for a medium externally of said probe.