Locating Appliance Push-Pull Bridge for False Measurement Reduction
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Solution Overview
Problem
Existing locating appliances tend to produce false measurements when sensitivity is increased, making the measurement process complex and ambiguous, and often require user calibration.
Innovation Solution
A locating appliance utilizing a push-pull measurement bridge with phase-shifted AC voltages and a control device to minimize AC voltage components, allowing for field-compensated and differential measurements, which eliminates the need for user calibration and enhances sensitivity and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensitivity is increased to detect objects more accurately, then measurement precision is improved, but false measurements increase and reliability deteriorates
Solution Approach 1:
The system performs preliminary calibration automatically during manufacturing by exposing the sensor to known reference objects with predetermined dielectric properties. This pre-calibration establishes baseline characteristics before the product reaches the user, eliminating the need for user calibration and ensuring consistent performance without false measurements.
Solution Approach 2:
The locating appliance performs self-calibration using its own integrated sensor system and reference objects. The device automatically adjusts its measurement parameters based on readings from reference objects with known dielectric properties, enabling the system to correct its own measurement characteristics without external intervention.
2Measurement precision
If sensitivity is increased to enhance detection capability, then measurement precision is improved, but device complexity increases due to calibration requirements
Solution Approach 1:
All calibration parameters and sensor characteristics are determined during the manufacturing process before the device is delivered to the user. The system includes built-in reference objects with known dielectric properties that are pre-installed in the appliance, allowing the sensor to be calibrated automatically during factory production without requiring complex user-side calibration procedures.
Solution Approach 2:
The calibration process is automated within the device itself, using integrated reference objects that the sensor automatically measures. The system performs self-characterization by comparing sensor readings against the known properties of reference objects, eliminating the need for external calibration equipment or complex user intervention.
3Reliability
If user calibration is required to ensure measurement accuracy, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The device is pre-calibrated during manufacturing using reference objects with predetermined dielectric properties. This preliminary calibration ensures that the sensor is already optimized for accurate measurements before the product reaches the user, completely eliminating the need for users to perform any calibration operations while maintaining high measurement reliability.
Solution Approach 2:
The locating appliance performs its own calibration automatically using integrated reference objects, making the calibration process invisible to the user. The system self-adjusts its measurement parameters based on readings from reference objects with known dielectric properties, ensuring accurate measurements without requiring any user intervention or operational complexity.
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
The solution enables a high-sensitivity, user-friendly locating appliance that can accurately detect metallic and dielectric objects without calibration, providing precise location coordinates and type identification of detected objects.
Implementation Method 1
A push-pull measurement bridge for actuating a first and/or a second electromagnetic device... The oscillator for supplying the capacitive electrodes or the coils with phase-shifted AC voltages
Implementation Method 2
A nonmetallic article, such as a wooden beam, can be detected by using its dielectric properties. To this end, an electrical field is produced and a check is performed to determine the extent to which the article influences the electrical field
Implementation Method 3
In order to trace a metallic article, such as a steel water pipe, within the wall, a magnetic field is usually produced and a check is performed to determine whether the article influences the magnetic field
Data Source
AI summary
A locating appliance configured to sense an article includes a push-pull measurement bridge and a comparator. The push-pull measurement bridge is configured to actuate a first electromagnetic device and a second electromagnetic device, in each case in a variable ratio. The first electromagnetic device takes the actuation as a basis for producing an electromagnetic alternating field in a region of the article. The comparator is configured to sense the article if the variable ratio differs from a predetermined ratio by more than a predetermined amount.