Eddy Current Sensor Segmentation for High-Temperature Reliability
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Solution Overview
Problem
Eddy current distance sensors fail due to high temperatures in extreme environments, requiring frequent replacements and necessitating specialized knowledge for accurate recalibration, which disrupts system operations.
Innovation Solution
A device with a two-part plug connection system, where the measuring transducer is in a first plug part connected to evaluation electronics, allowing for safe and accurate distance measurement, even by unqualified personnel, with a freely selectable cable length to avoid high temperatures and a rotating coupling to prevent cable twisting, and a plug connection for parameter adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the eddy current sensor is used in high temperature environments, then the measurement capability is maintained, but the sensor fails when temperature exceeds 230°C
Solution Approach 1:
The system is divided into two separate parts: the eddy current sensor (measuring transducer) that remains in the hot environment, and the transmitter that operates in a cooler environment. They are connected via a cable, allowing the sensitive transmitter to be isolated from high temperatures while the sensor continues to measure in the hot zone.
Solution Approach 2:
A cable connection acts as an intermediary between the eddy current sensor in the high-temperature zone and the transmitter in the cooler zone. This intermediary allows signal transmission while physically separating the temperature-sensitive transmitter from the harsh thermal environment.
2Productivity
If the eddy current sensor is replaced on-site, then system continuity is maintained, but specialized calibration knowledge is required
Solution Approach 1:
The transmitter is pre-calibrated and pre-assembled with the eddy current sensor as a complete replacement unit. This preliminary preparation ensures that when replacement is needed, the pre-calibrated unit can be simply plugged in without requiring on-site calibration operations.
Solution Approach 2:
The replacement unit is designed to be self-contained and self-calibrated. The transmitter comes pre-configured with the sensor, creating a plug-and-play solution that performs self-service calibration, eliminating the need for external calibration equipment or specialized knowledge.
3Length of stationary object
If the transmitter is placed close to the eddy current sensor, then cable length is reduced, but the transmitter is exposed to high temperatures
Solution Approach 1:
The cable length is made dynamically selectable rather than fixed. Users can choose different cable lengths based on the specific installation requirements, allowing optimization of both cable length and temperature exposure for each application scenario.
4Stability of the object's composition
If the connector is made rigid, then connection stability is improved, but cable twisting occurs during rotation
Solution Approach 1:
The connector incorporates a swivel coupling that allows dynamic rotation and movement. This dynamic feature enables the cable to rotate and adjust without twisting, maintaining connection stability while accommodating rotational movements in the application environment.
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 quick and accurate on-site replacement and recalibration of eddy current sensors, maintaining measurement accuracy without system interruption and protecting the measuring transducer from high temperatures.
Implementation Method 1
the transmitter, together with the eddy current sensor, forms an oscillator circuit using the eddy current measurement method. The oscillation amplitude of this circuit is damped by the approach of an electrically conductive object to the end face of the eddy current sensor. The damping is proportional to the distance between the coil of the current sensor and the object being measured.
Implementation Method 2
energy is extracted by changing the distance between the eddy current sensor and the component, the oscillator circuit, also called a resonant circuit. This energy extraction is proportional to the distance between the eddy current sensor and the measuring device. The energy extraction is reflected in a voltage change; that is, the respective voltage is proportional to the distance of the eddy current sensor from the component.
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a device (1) for determining the distance between two components, comprising an eddy current sensor (3) with a measuring transmitter (10) connected to it by a cable connection (5), wherein the measuring transmitter (10) is arranged in a first plug part (4) of a two-part plug connection, wherein the second plug part (6) is connected to an evaluation electronics (9).