Reliable operation of propagation time-based field devices

The method for time-of-flight-based field devices addresses electromagnetic interference by using calibration signals to suppress noise and interference, ensuring accurate process variable measurement and real-time detection, enhancing electromagnetic compatibility and safety.

WO2026131106A1PCT designated stage Publication Date: 2026-06-25ENDRESS & HAUSER GMBH & CO KG
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ENDRESS & HAUSER GMBH & CO KG
Filing Date
2025-12-02
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Time-of-flight-based field devices are susceptible to electromagnetic interference, leading to erroneous measurements and potential critical process conditions due to interference signals within the frequency range of the time-of-flight signal generation and evaluation.

Method used

A method involving calibration and measurement modes, where a calibration signal is received independently of the time-of-flight signal, allowing for active interference suppression by subtracting or filtering out noise and interference components from the received signal, and optionally issuing warnings or diagnostic messages.

Benefits of technology

Enhances the electromagnetic compatibility of field devices by ensuring accurate process variable determination and providing real-time interference detection and warning capabilities, thereby preventing erroneous measurements and maintaining safe operation.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure EP2025085133_25062026_PF_FP_ABST
    Figure EP2025085133_25062026_PF_FP_ABST
Patent Text Reader

Abstract

The invention relates to a method for reliably operating different types of propagation time-based field devices (1), such as radar-, ultrasound-, and TDR-based field devices. The method has the following method steps: - in a comparison mode, a comparison signal (RHF,a) is recorded as the received signal (RHF), the comparison signal not being influenced by the propagation time signal (SHF), and - in a measurement mode, the propagation time signal (SHF) is transmitted, the corresponding received signal (RHF) is recorded, the received signal (RHF) is compared with the comparison signal (AHF), and the process variable is determined using the compared received signal (RHF, a). The invention is thus based on the concept of recording a received signal (RHF), which is independent of the transmitted propagation time signal (SHF), for comparison or analysis purposes, since this ensures that any signal component in the resulting comparison signal (AHF) must be internal noise or external interference sources.
Need to check novelty before this filing date? Find Prior Art