Concrete Spectral Curve Correction for Distance Variations
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Solution Overview
Problem
Conventional non-destructive methods for measuring salt damage and neutralization in concrete structures face challenges in accuracy due to changes in the waveform shape of spectral curves with distance, making remote, non-contact measurements unreliable.
Innovation Solution
A spectral curve acquiring device and method that includes a light projecting and receiving system, distance meter, and control arithmetic module to correct measurement spectral curves based on reference curves, allowing for accurate measurement of salt damage and neutralization by compensating for distance variations and selecting matching deteriorated spectral reflectance curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If remote non-contact measurement is performed on concrete, then destructive inspection is avoided and repeated measurement becomes possible, but measurement accuracy deteriorates due to waveform shape changes with distance
Solution Approach 1:
The system performs preliminary measurement of reference spectral curves at multiple known distances before actual concrete measurement. These reference curves are stored and used to select and apply the appropriate correction factor based on the measured distance, enabling accurate concrete analysis despite distance variations
Solution Approach 2:
The system changes the parameter being measured from raw spectral intensity to spectral reflectance by applying distance-based correction factors. This parameter transformation compensates for the waveform shape changes caused by distance variations, allowing accurate comparison of concrete spectral characteristics regardless of measurement distance
2Adaptability or versatility
If spectral measurement is performed at different distances, then measurement flexibility increases, but waveform shape variability increases making accurate diagnosis difficult
Solution Approach 1:
The system uses the measured distance as feedback to select the appropriate reference spectral curve and apply the corresponding correction factor. This closed-loop approach ensures that the spectral reflectance curve is always corrected based on the actual measurement conditions, maintaining waveform consistency across different distances
Solution Approach 2:
The reference spectral curves serve as an intermediary between the raw spectral measurements and the final concrete analysis. By introducing this intermediate correction step, the system translates distance-varied spectral data into standardized spectral reflectance curves that can be reliably compared
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 accurate and stable remote measurement of salt damage and neutralization in concrete structures by correcting spectral curves for distance and selecting matching reference curves, ensuring consistent results regardless of distance from the measurement point.
Implementation Method 1
a light projecting optical system for irradiating an irradiating light, a light receiving optical system for dispersing and receiving a reflected irradiating light reflected by an object to be measured
Data Source
AI summary
A spectral curve acquiring device comprising: a light receiving optical system (6) for irradiating an irradiating light, a light receiving optical system (8) for dispersing and receiving a reflected irradiating light reflected by an object to be measured (7), a distance meter (4) for measuring a distance to the object to be measured, a storage module (25) for storing a plurality of reference spectral curves prepared based on a light receiving intensity for each wavelength at the time of measuring a white reference plate with different distances, and a control arithmetic module (24), wherein the control arithmetic module obtains a light receiving intensity of the dispersed reflected irradiating light for each wavelength based on the reference spectral curve corresponding to a distance to be measured, corrects a measurement spectral curve prepared based on the light receiving intensity, and prepares a spectral reflectance curve.