摘要:
A reflector reflects electromagnetic waves, which waves are emitted into a conducting structure from at least one antenna situated at a distance (d′) from the reflector. The distance (d′) is calculated based on measured emitted and reflected waves to and from the reflector, respectively. The reflector includes a reflector disc, an elongated body having a first longitudinal end and a second longitudinal end, the first longitudinal end being fastened to the reflector disc and the second longitudinal end being fastenable to an accumulator piston. Said elongated body further comprises at least two telescopically interconnected reflector tubes rendering reversible adjustment of the elongated body's longitudinal length around a predetermined equilibrium length possible. A piston accumulator applying the reflector, and a method for measuring the distance (d′) are also provided.
摘要:
An apparatus forming a measuring device for ascertaining and monitoring a chemical or physical process variable in a high temperature process in a container, wherein the measuring device is formed from at least a sensor element located in the process and at least a measurement transmitter located outside the process. At least a first sealing element is provided for sealing against penetration of process medium into the sensor element. The sensor element has a boundary location between a first sensor element region, which faces the process and which is embodied with a high thermal resistance, and a second sensor element region, which faces away from the process and which has a low thermal resistance, and that the temperature sensitive element is arranged in the sensor element at the boundary location.
摘要:
A microwave window for the spatial, pressure-impervious and diffusion-impervious separation and microwave connection of a first space from/to a second space, and a level-measuring system that works according to the radar principle, is provided with a barrier that has two opposite sides and is at least partially permeable to microwaves. To provide a microwave window that makes possible a reliable sealing of a process space and exact measurement, the microwave window has the barrier designed as a disk on at least one side of which at least one plano-convex dielectric lens, which has an essentially homogenous body.
摘要:
A method of determining a filling level of a product contained in a tank using a level gauge system, comprising the steps of: transmitting a first signal towards a surface of the product; receiving a first echo signal; determining a present echo characteristic value based on the first echo signal; and comparing the present echo characteristic value and a stored echo characteristic value. If a difference between the present echo characteristic value and the stored echo characteristic value is greater than a predefined value, the method further comprises transmitting at least a second transmit signal towards the surface; receiving at least a second echo signal; and determining the filling level based on the at least second electromagnetic echo signal.
摘要:
Disclosed is a pivotable horn antenna intended for a radar level indicator and includes a ball joint, the joint socket of which can be screwed into a threaded hole in the container. This allows for optimisation of the echo signal and correction of slanted installation of the horn antenna.
摘要:
A two-channel directional antenna for use in a radar level gauge. The antenna comprises a partition wall dividing the antenna into a first partition for emitting an electromagnetic transmit signal, and a second partition for receiving an electromagnetic echo signal, the partition wall having an outer potion located downstream in a direction of radiation of the antenna. The partition wall comprises an electromagnetic de-coupling structure, which is arranged to reduce any leakage of electromagnetic energy from the transmit signal into the echo signal.The electromagnetic de-coupling structure according to the present invention ensures that the leakage of transmit signal into the received signal is reduced to a satisfactory level.
摘要:
A horn antenna for a radar device including a dielectric filling body arranged in a hollow horn section of a metal body and a dielectric cover attached to the filling body and sealingly closing the open end of the metal body. The filling body includes a first conical portion that is fittingly received in the hollow horn section, and a second conical portion that is situated away from the open end and dimensioned to leave a gap between itself and the wall of the hollow horn section. The dielectric filling body has a third portion between the first and second portions, where the third portion and the opposite portion of the wall of the hollow horn section are provided with circumferential grooves arranged in pairs opposite each other to provide a wear and maintenance-free attachment of the dielectric filling body in the horn antenna.
摘要:
A radar level gauge using electromagnetic signals to determine a filling level of a product in a tank, comprising an electronics unit including transceiver circuitry, a signal propagation device, and a directional coupler. The gauge further comprises a wave guiding structure comprising a rod of a dielectric material. A mounting portion of the electronics unit defines an opening and is detachably mountable on the dielectric rod so that the rod extends through the opening and is at least partly surrounded by the opening. The mounting portion is further arranged to secure the circuitry portion relative the rod so that the directional coupler is in a position to couple signals between the transceiver circuitry and the rod.The radar level gauge according to the present invention facilitates replacement of an electronics unit, e.g. in case of malfunction or upgrades. At the same time, the dielectric rod enables a very simple, cost-effective and reliable feeding to and from each electronics unit.
摘要:
An apparatus comprises a structure including a cavity that, when excited with electromagnetic energy, produces an electric field having randomized distribution of field amplitude and polarity. The apparatus further comprises a sensor within the cavity. The sensor has a plurality of antennas for wirelessly harvesting operating power along different paths within the cavity.
摘要:
A filling level measuring device antenna cover includes a base body and a plurality of circular fins concentrically arranged on the base body, wherein the fins and the base body consist of a plastic material. The fins and the base body are one piece and injection-moulded.