Measuring Device Calibration Shift Detection
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Solution Overview
Problem
Existing measuring devices face accuracy issues due to calibration shifts over time between the measuring unit and the capturing unit, requiring frequent recalibration to maintain measurement accuracy.
Innovation Solution
A measuring device that includes a measuring unit, a capturing unit, an estimation unit, a calculator, and a detector, which irradiates objects with light beams, estimates projection positions, calculates reflection and brightness changes, and detects calibration shifts by comparing these changes to threshold values, allowing for timely notification and potential automatic recalibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration work is performed in advance to obtain calibration information, then measurement accuracy is improved, but the relative position or posture between measuring unit and capturing unit may change over time causing calibration shift
Solution Approach 1:
The patent performs calibration work in advance to obtain calibration information before actual measurement, storing the relative position and posture data for later use. This preliminary calibration establishes the initial accurate relationship between measuring unit and capturing unit, improving measurement accuracy while allowing for potential drift over time.
Solution Approach 2:
The patent introduces a detection mechanism that continuously monitors the calibration state by comparing current measurement data with reference data. When calibration shift is detected through threshold comparison, the system provides feedback to trigger recalibration, maintaining measurement accuracy without requiring continuous manual calibration.
2Measurement precision
If calibration work is performed frequently to maintain accuracy, then measurement precision is improved, but time loss and operational efficiency deteriorate
Solution Approach 1:
The system implements automatic calibration shift detection by comparing current measurement results with reference data stored during initial calibration. When the difference exceeds a predetermined threshold, the system triggers recalibration only when necessary, avoiding frequent unnecessary calibration operations and reducing time loss while maintaining measurement precision.
Solution Approach 2:
The measuring device performs self-diagnosis of calibration status by automatically comparing measurement data with reference data and detecting calibration shifts. This self-monitoring capability eliminates the need for manual, frequent calibration checks, reducing operational time loss while maintaining accuracy through on-demand recalibration.
3Difficulty of detecting and measuring
If invisible light is used for calibration shift detection, then detection capability is improved, but device complexity increases due to invisibility filter requirements
Solution Approach 1:
The patent utilizes invisible light (different wavelength/color) for illumination and detection. By using light outside the visible spectrum, the system can detect calibration shifts without interference from visible light reflections, improving detection capability. The invisibility filter in the capturing unit selectively blocks visible light while passing invisible light, enabling specialized detection functionality.
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 swift detection and notification of calibration shifts, facilitating user correction and potentially automatic recalibration, thereby maintaining measurement accuracy without frequent recalibration.
Implementation Method 1
a measuring unit that irradiates an object with a plurality of light beams and that measures, for each light beam, a direction of an irradiated point on the object, a distance to the irradiated point, and reflection intensity of the irradiated point
Data Source
AI summary
According to an embodiment, a measuring device includes a measuring unit, a capturing unit, an estimation unit, a calculator, and a detector. The estimation unit estimates, for each irradiated point, an estimated projection position on the image, using a direction and a distance of the irradiated point and calibration information based on calibration of a measuring unit and a capturing unit. The calculator calculates, for each irradiated point, an amount of change in reflection intensity and obtains a reflection intensity change point. The calculator calculates, for each estimated projection position, an amount of change in brightness and obtains a brightness change point. The detector detects a calibration shift between the measuring unit and the capturing unit by comparing the reflection intensity change point and the brightness change point.