Guided Wave Radar In Situ Verification Circuit
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Solution Overview
Problem
Conventional guided wave radar device verification methods require physical detachment from the tank, posing safety risks and mechanical issues, and often necessitate costly and inconvenient central verification or on-site services due to the lack of accessibility of verification kits.
Innovation Solution
A time-of-flight guided wave radar device with a built-in verification circuit that allows for calibration and verification without removing the device from the process location, using a verification circuit with conductor traces or coaxial cables to simulate a known delay and compare the time-of-flight of radar pulses, enabling in-situ verification and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the guided wave radar device is detached from the tank for verification using a verification kit, then the calibration accuracy can be verified against a known reference, but the service person faces safety risks from climbing the tank and potential mechanical issues from detaching and attaching parts
Solution Approach 1:
The verification function is extracted from the external verification kit and integrated directly into the radar device through a built-in verification circuit. This allows the radar device to perform self-verification by switching between measurement mode (using the wave guide in the tank) and verification mode (using the internal verification circuit), eliminating the need to detach the device from the tank while maintaining calibration accuracy verification capability
Solution Approach 2:
A built-in verification circuit serves as an intermediary element that provides a known reference path within the radar device itself. This verification circuit includes reference cables or transmission lines with predetermined characteristics that act as an internal reference standard, allowing accuracy verification without external kits or tank climbing
2Measurement precision
If the verification kit is not easily available everywhere, then the radar unit may need to be sent to a central place for verification or a verification service may need to be called, but this makes the verification process cumbersome and expensive
Solution Approach 1:
The radar device performs verification of its own calibration accuracy through the built-in verification circuit. The device can autonomously switch to verification mode, measure the known reference path through the verification circuit, compare the measurement against expected values, and generate verification results without requiring external verification kits, centralized verification facilities, or service personnel
Solution Approach 2:
The built-in verification circuit provides multiple functions: it serves as both a reference standard for verification and as part of the overall measurement system. The same circuitry and switching mechanism enable both normal measurement operations and verification operations, making the device universally capable without requiring separate verification equipment
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables safe, efficient, and cost-effective in-situ verification of guided wave radar devices, reducing mechanical risks and the need for frequent removal and reinstallation, while maintaining accuracy and repeatability of measurements.
Implementation Method 1
comparing a time-of-flight of the reflected radar pulse with an expected time-of-flight of the verification circuit
Implementation Method 2
reflecting the radar pulse from the verification circuit to a measuring circuit of the radar device after a pre-determined delay
Data Source
AI summary
The application discloses a method for verifying the accuracy of a guided-wave radar measuring device used in process automation. The method includes sending measuring radar waves to a built-in verification circuit of a known and verified length and performing time-of-flight analysis on the measuring radar wave reflected by the built-in verification circuit. The application also discloses a guided-wave radar device having a built-in verification circuit.