Method and apparatus for measuring the distance to an object

Details Method and apparatus for measuring the distance to an object Method and apparatus for measuring the distance to an object

G - Physics

01

S

340/140, 343/38,

G01S 13/08 (2006.01) G01F 23/00 (2006.01)

Patent

CA 1228658

Abstract: Method and device for measuring the distance to an object, particularly the distance to the surface (17) of a liquid in a container (15). An antenna (11) is arranged in a distance from and aimed against the sur- face, the antenna being connected to a measuring unit (12), a channel unit (13) and a control unit (14). A microwave signal with a predetermined frequency is gene- rated in the measuring unit (12), of which a part is utilized as a reference signal, while a further part is input to the antenna (11) and transmitted against the surface (17). From the reflected signal received by the antenna and supplied to the measuring unit (12) and the reference signal, a function of the antenna input reflec- tion coefficient is formed. This function is adapted to the current condition. A fourier transformation of a set of values of this function at a certain set of measuring frequencies is made, from which the distance to the sur- face is calculated. Fig. 1.

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