Abstract: Method and system for measuring vertical density profile of fluid by pressurizing an array of pipes, determining level and pressure signals on each pipe and deriving profile therefrom.

Abstract: An apparatus and method for washing and disinfecting domestic pets which uses a container having a recirculating pump contained therein is provided. A small volume of a liquid is initially put into the container. The container allows the liquid to drain toward the recirculating pump having a wash hose connected thereto. An animal such as a dog may be held in the container by a collar and frame assembly attached to the container. The liquid continues to be recirculated thru the wash hose until the pet has been thoroughly cleaned and disinfected.

Abstract: A method and apparatus are provided for measuring the level of a surface of a material in a tank. The apparatus and method modulate an optical radiation beam at a radio frequency. The radiation beam is transmitted to the surface and the reflected beam received. The modulation frequency is changed until the phase of the received beam is the same as that from an optical reference path. The optical reference path is any fixed length path that allows the beam to pass from the source of the beam to the receiver that receives the reflected beam. An optical switch determines whether the receiver receives the reflected beam or the reference beam. The change in modulation frequency may then be correlated with the level on the material's surface in the tank.