Device and a process for determining the positions of border areas between different mediums
First Claim
1. A process for determining a position of at least one border area between different mediums with the aid of electromagnetic waves, comprising:
- emitting a departing wave from a wave transmitter, said emitted wave having at least one propagation speed component that is parallel to normal line(s) of the border area of the different mediums;
reflecting the emitted departing wave, at least partially, on at least one border area;
receiving portions of the reflected returning wave by a wave receiver;
determining travel times between emission of the departing wave and reception of the returning wave;
determining a position of at least one border area from the travel times, based on different propagation speeds of the waves in the different mediums, whereinthe portions of the reflected returning wave are employed to determine the different propagation speeds (v) in the different mediums (4, 5), the different propagation speeds (v) in the different mediums (4, 5) are determined from the amplitude ratios (r) of the departing wave (UH1) to the returning wave (UR1) and a quadratic relationship of dielectric constants ε
r to the amplitude ratios (r)(=reflection factor).
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Accused Products
Abstract
A process for determining the position of the border areas between different mediums with the aid of electromagnetic waves, in which process a departing wave which is emitted from a wave transmitter has at least one propagation speed component that is parallel to the normal lines of the border area of the different mediums; the emitted departing wave is at least partially reflected at the border areas; the portions of the reflected returning wave are received by a wave receiver; the travel times between emission of the departing wave and reception of the returning wave are determined; the positions of the border areas are determined from the travel times, with account taken of the different propagation speeds of the wave in the different mediums, while the various portions of the reflected waves in the different mediums (4, 5) are made use of. It is important to take into account here the quadratic relationship of εr to the reflection factor r.
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Citations
20 Claims
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1. A process for determining a position of at least one border area between different mediums with the aid of electromagnetic waves, comprising:
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emitting a departing wave from a wave transmitter, said emitted wave having at least one propagation speed component that is parallel to normal line(s) of the border area of the different mediums;
reflecting the emitted departing wave, at least partially, on at least one border area;
receiving portions of the reflected returning wave by a wave receiver;
determining travel times between emission of the departing wave and reception of the returning wave;
determining a position of at least one border area from the travel times, based on different propagation speeds of the waves in the different mediums, wherein the portions of the reflected returning wave are employed to determine the different propagation speeds (v) in the different mediums (4, 5), the different propagation speeds (v) in the different mediums (4, 5) are determined from the amplitude ratios (r) of the departing wave (UH1) to the returning wave (UR1) and a quadratic relationship of dielectric constants ε
r to the amplitude ratios (r)(=reflection factor).- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for determining positions of border areas between different mediums (4, 5) with the aid of electromagnetic waves, comprising:
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a wave transmitter for emitting a departing wave which exhibits at least one propagation speed component that is parallel to normal lines of the border areas of the different mediums and which is at least partially reflected at the border areas;
a wave receiver for receiving portions of a reflected returning wave;
an initial evaluation unit for determining travel times between emission of the departing wave and reception of the reflected returning wave;
a second evaluation unit for determining positions of the border areas from the travel times while taking account of the different propagation speeds of the wave in the different mediums, wherein a third evaluation unit is provided for determining different propagation speeds (v) in the different mediums (4, 5) from the portions (UR1) of the reflected returning wave, while the different propagation speeds (v) of the wave in the different mediums (4, 5) are determined with the aid of the amplitude ratios (r) of the departing wave (UH1) to the returning wave (UR1), while taking into account a quadratic relationship of the dielectric constants ε
r to the amplitude ratios (r)(=reflection factor).- View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
an electronic unit (1) with a microprocessor (11);
a RAM (19) connected to the microprocessor (11);
a ROM (16) connected to the microprocessor (11);
an EEPROM (18) connected to the microprocessor (11);
a display (17) connected to the microprocessor (11);
a pulse generator (10) connected to the microprocessor (11);
a directional coupler (12) connected to the pulse generator (10), said directional coupler (12) having an attachment (8) for transmitting and receiving waves;
a receiving amplifier (14) connected to said directional coupler (12); and
an A/D transformer (15) attached to the receiving amplifier (14) and to the microprocessor (11).
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Specification