GUIDED WAVE RADAR LEVEL GAUGE SYSTEM WITH REDUCED END OF PROBE REFLECTION

摘要

The present invention relates to a guided wave radar level gauge system comprising a transceiver for generating an electromagnetic transmit signal within a predetermined frequency range having a center frequency, a flexible single conductor probe having a first end connected to the transceiver and extending towards and into the product to a second end of the flexible single conductor probe; and a probe aligning member attached to the second end of the flexible single conductor probe for keeping the flexible single conductor probe substantially vertically extending from the first end to the second end. The probe aligning member exhibits a horizontal extension that increases with increasing distance from the first end of the flexible single conductor probe along a vertical distance greater than one half of a wavelength of the transmit signal at the center frequency. Hereby, determination of filling levels close to the bottom of the tank is improved.

主权项

1. A guided wave radar level gauge system, for determining a filling level of a product contained in a tank, said guided wave radar level gauge system comprising:
a transceiver for generating, transmitting and receiving electromagnetic signals within a predetermined frequency range having a center frequency; a flexible single conductor probe having a first end connected to said transceiver and extending towards and into said product to a second end of the flexible single conductor probe for guiding an electromagnetic transmit signal from said transceiver through a tank atmosphere towards a surface of the product, and for returning an electromagnetic surface reflection signal resulting from reflection of said transmit signal at said surface back towards said transceiver; a probe aligning member attached to said second end of the flexible single conductor probe for keeping the flexible single conductor probe substantially vertically extending from the first end to the second end, said probe aligning member exhibiting a horizontal extension that increases with increasing distance from said first end of the flexible single conductor probe along a vertical distance greater than one half of a wavelength of said transmit signal at said center frequency; and processing circuitry connected to said transceiver for determining said filling level based on said transmit signal and said surface reflection signal.