Hole Wall Distance Sensor Calibration in Bentonite Suspension
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Solution Overview
Problem
Existing measuring devices for holes in the ground, particularly those filled with bentonite suspension, face significant measurement inaccuracies due to changing density and consistency, leading to deviations in hole progression and increased labor and materials required for bored pile or diaphragm wall construction.
Innovation Solution
A measuring device equipped with a calibrating means and a calibration element that allows for self-calibration of the measurement signal assignment rule by transmitting a calibration signal and using the known calibration distance to determine and adapt to changes in signal propagation speed, ensuring precise distance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distance sensors are used to measure hole wall coordinates, then hole progression deviation can be detected, but measurement inaccuracies occur due to changing suspension density and consistency
Solution Approach 1:
The patent applies parameter changes by using multiple measurement wavelengths (e.g., 405nm, 532nm, 635nm, 808nm) to detect and compensate for variations in suspension optical properties. By measuring at different wavelengths, the system can distinguish between actual distance changes and apparent changes caused by suspension density and consistency variations, thereby maintaining measurement accuracy and reliability in the challenging environment of bentonite suspension-filled holes.
2Reliability
If higher overlap between adjacent bored piles is used to compensate for measurement inaccuracies, then construction safety improves, but labor and material requirements increase
Solution Approach 1:
The patent implements feedback by continuously monitoring measurement quality indicators (such as signal strength, reflection characteristics, and wavelength-dependent variations) and using this information to dynamically adjust measurement strategies or alert operators to potential accuracy issues. This feedback mechanism allows for maintaining construction safety through reliable measurements without requiring excessive overlap, as the system can identify and compensate for measurement uncertainties in real-time, thereby improving construction efficiency.
3Measurement precision
If calibration means with calibration element is added to the measuring probe, then assignment rule can be calibrated and measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by incorporating a calibration element (such as a reflector or target with known optical properties) and calibration means directly into the measuring probe assembly. This allows calibration to be performed in advance or periodically before actual measurements, establishing accurate assignment rules that account for the specific optical conditions of the bentonite suspension. By preparing the calibration state beforehand, the system achieves high measurement accuracy without requiring complex real-time adjustments during measurement operations.
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 provides highly accurate and reliable distance measurements by accounting for changes in the medium's properties, reducing measurement uncertainties and improving the precision of hole wall positioning, thereby reducing labor and material requirements.
Implementation Method 1
at least one measurement signal receiver (14) to receive the measurement signal reflected on a wall area (5) of the hole (3)
Implementation Method 2
the measurement signal transmitter (12) is designed to transmit a calibration signal, which can reflect on the calibration element (22), at least one measurement signal receiver (14) is designed to receive the calibration signal reflected on the calibration element (22)
Data Source
AI summary
A measuring device for measuring a hole in the ground having at least one measuring probe having at least one measurement signal transmitter to transmit a measurement signal, at least one measurement signal receiver to receive the measurement signal reflected on a wall area of the hole, and an evaluation unit for determining a wall distance between the measurement signal transmitter and the wall area of the hole, wherein a measuring distance based on an assignment rule can be assigned to the received, reflected measurement signal. A calibrating device having at least one calibration element. The measurement signal transmitter transmits a calibration signal, which can be reflected on the calibration element, wherein the measurement signal receiver receives the calibration signal reflected on the calibration element. The evaluation unit changes and calibrates the assignment rule based on the calibration signal reflected and received by the calibration element.