초록 ▼

A flowmeter utilizing velocity at the surface of a fluid and lookdown level sensors is mounted within a manhole without requiring entry into the manhole by the installer. The velocity and level sensors generate first and second energy signal beams which are directed toward the same vicinity of the f

A flowmeter utilizing velocity at the surface of a fluid and lookdown level sensors is mounted within a manhole without requiring entry into the manhole by the installer. The velocity and level sensors generate first and second energy signal beams which are directed toward the same vicinity of the fluid surface which reflects the beams back to the sensors surface velocity signal representative of the velocity of scatters on the fluid surface is produced from the Doppler frequency shift between the directed and reflected first beam. This signal is modified to produce a mean velocity signal. A level signal is produced by determining the air space between the sensor and the fluid surface from the directed and reflected second beam and relating changes in the air space to changes in fluid level in accordance with the configuration of the pipe. Fluid flow can be calculated from the mean velocity and fluid level signals.

대표청구항 ▼

[ What is claimed is:] [1.] A method for measuring the velocity of fluid flowing through a pipe without invading the fluid, comprising the steps of(a) generating an energy signal in the form of a first beam from a source above the fluid surface;(b) directing said first beam at an acute angle toward

[ What is claimed is:] [1.] A method for measuring the velocity of fluid flowing through a pipe without invading the fluid, comprising the steps of(a) generating an energy signal in the form of a first beam from a source above the fluid surface;(b) directing said first beam at an acute angle toward a given area of the fluid surface across the pipe;(c) detecting a beam reflected from the fluid surface;(d) determining from the directed and reflected beams the Doppler frequency shift therebetween to produce a surface velocity signal representative of the velocity of scatterers on the fluid surface; and(e) modifying said surface velocity signal with a modifier in accordance with said given area of the fluid surface being detected to produce a mean velocity signal.