Patent ID: 7942036

Claim:
A rheometric measurement device comprising: an optically transparent fixed surface; a moving surface in a generally parallel relation to the fixed surface, the moving surface being either a flat plate, a flat surface or a conical surface having a longitudinal axis in a perpendicular relation to the fixed surface with the conical surface being in an acute angular relation to the fixed surface and the conical surface being free to rotate about its longitudinal axis, and wherein the fixed surface and moving surface are spaced apart; an optically transparent barrier occupying a perimeter about the fixed surface and the moving surface, wherein the spacing of the fixed surface and moving surface define an internal space bounded by the fixed surface, the moving surface and the optically transparent barrier, wherein the internal space is able to accept material to be evaluated, wherein the internal space is visible from outside the fixed surface, the moving surface and the optically transparent barrier, and wherein the moving surface is able to move in relation to the fixed surface in order to create a torque on any material located in the internal space; at least one laser wherein a beam of the at least one laser impinges the moving surface and can be directed through the optically transparent surface or the optically transparent barrier; and at least one visual receiving means directed to the internal space through the optically transparent surface or the optically transparent barrier and able to receive or view any material located in the internal space.