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Fill level measuring device

A measuring device, filling level technology, applied in the direction of measuring device, device for measuring time interval, lubricating indicating device, etc., can solve the problem of no longer meeting the necessary conditions, achieve the elimination of undesired aliasing effects, reduce time and complexity Sex, the effect of eliminating need

Active Publication Date: 2020-07-28
EHNDRESS KHAUZER GMBKH KO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The necessary condition for the Nyquist-Shannon sampling theorem, which requires the sampling rate to be at least twice the frequency of the signal to be sampled, is no longer satisfied due to this numerical ordering of the sampled values

Method used

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Examples

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Embodiment Construction

[0023] figure 1 A block diagram showing the components of the pulse radar fill level measuring device 1 is shown. Two pulse repetition frequency (hereinafter "prf") generators 2, 3 are shown. The generator can be realized eg as a crystal oscillator. The prf generators 2, 3 in pulsed radar installations typically oscillate in the megahertz range and include slightly different frequencies. The prf generators 2, 3 are each connected to a pulse generator 4, 5 which outputs a pulse having a predetermined pulse width according to an input signal received from the prf generator 2, 3. The pulse width is determined by the pulse generator 4, 5 itself and is fixed or can be changed by an analog configuration signal. The repetition frequency of the pulse is determined by the prf generator 2,3.

[0024]The first pulse generator 4 is connected to the transmitting oscillator 6, and the transmitting oscillator 6 is used to modulate a high-frequency signal onto each pulse and output a high...

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PUM

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Abstract

The invention relates to a measuring device (1) for measuring a filling level (11) of a material in a container (12) based on the time-of-flight principle, comprising means for generating, emitting and receiving measuring signals (S), and also for converting the measurement signal (S) into an analog intermediate frequency signal (S IF ) component (2‑9), the intermediate frequency signal (S IF ) having a desired signal frequency within a predetermined frequency range, comprising information corresponding to the filling level (11) of the material in the container (12), wherein an analog-to-digital converter (16) is provided, said analog-to-digital converter (16 ) is used subsequently for the intermediate frequency signal (S IF ) to sample, the analog-to-digital converter (16) adopts less than the intermediate frequency signal (S IF ) The sampling frequency of the desired signal frequency (f s ).

Description

technical field [0001] The invention relates to a fill-level measuring device for measuring the fill level of a material in a container based on the time-of-flight principle, comprising a device for generating, transmitting and receiving a measuring signal and also for converting said measuring signal into an analog intermediate frequency Components of a signal, the intermediate frequency signal having a desired signal frequency within a predetermined frequency range, comprising information corresponding to a fill level of material in the container. [0002] The invention relates in particular to fill level devices, such as radar-based measuring devices, using ultrasonic and / or electromagnetic measuring signals. Such fill level measuring devices are offered, for example, by the joint company Endress+Hauser under the trademarks Prosonic, Micropilot and Levelflex. A fill level measuring device in the sense of the present invention is not to be understood as being limited to a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/285G01S13/10G01S13/88G01F23/284G01F23/296
CPCG01F23/284G01F23/296G01S7/285G01S13/10G01S13/88G01F23/28G01S7/282G04F5/04G04F8/02
Inventor 克里斯蒂安·塞勒帕特里克·多伊贝尔
Owner EHNDRESS KHAUZER GMBKH KO KG