Distance Measuring System Error Correction via Transflective Plate Calibration
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Solution Overview
Problem
Distance-measuring devices are affected by background light and flicker phenomena, leading to inaccurate distance calculations due to assembling errors and component shifts during fabrication.
Innovation Solution
A distance-measuring system with a correction function that includes a calibrating object, transflective plate, and parameter-calculating circuit to calculate and correct lighting-error and sensing-error angles, using known distances and imaging locations to improve measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance-measuring device uses standard components without correction, then the device complexity is low, but the measurement precision deteriorates due to assembling errors and component shifts
Solution Approach 1:
The patent applies preliminary action by performing calibration before actual distance measurement. A calibrating object with known dimensions is positioned in the measurement field, and the system calculates correction values for lighting-error angle and sensing-error angle based on the deviation between measured and actual dimensions. These correction values are stored and applied during subsequent measurements, eliminating the need for complex real-time correction mechanisms while achieving high precision.
Solution Approach 2:
The system applies self-service by using its own measurement capability to calibrate itself. The distance-measuring device measures the known dimensions of the calibrating object, automatically calculates the error angles, and generates correction values without requiring external calibration equipment or manual adjustment. This self-calibration process simplifies the overall system structure while improving measurement accuracy.
2Adaptability or versatility
If the device operates in environments with background light and flicker, then the adaptability is improved, but the measurement precision deteriorates due to incorrect distance calculations
Solution Approach 1:
The patent applies feedback by using the measured imaging locations and known dimensions of the calibrating object to calculate correction values for lighting-error angle and sensing-error angle. These correction values are then fed back into the measurement system to compensate for errors caused by background light and flicker. The feedback mechanism enables the system to maintain high measurement precision in challenging environmental conditions without reducing adaptability.
3Measurement precision
If multiple calibration parameters are calculated to correct errors, then the measurement precision is improved, but the device complexity increases due to additional calculation and correction functions
Solution Approach 1:
The patent applies taking out by extracting the essential correction parameters (lighting-error angle and sensing-error angle) from complex multi-parameter calibration systems. Instead of correcting multiple independent error sources separately, the invention identifies and corrects these two fundamental angular errors that encompass the majority of measurement deviations. This extraction approach maintains high measurement precision while significantly reducing calculation and system 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 system effectively reduces the impact of background light and flicker, enhancing the accuracy of distance measurements by calibrating and compensating for errors caused by assembling inaccuracies and environmental factors.
Implementation Method 1
The detecting light passing through the transflective plate is reflected by the calibrating object and then is transferred into a first reflecting light transmitting to a first imaging location of the image sensor, the detecting light reflected by the transflective plate is transferred into a second reflecting light transmitting to a second imaging location of the image sensor
Data Source
AI summary
Distance-measuring system with correction function includes calibrating object, transflective plate, and distance-measuring device. Distance-measuring device has a first known distance and a second known distance respectively between calibrating object and transflective plate. Transflective plate is disposed between calibrating object and distance-measuring device. Distance-measuring device includes light emitting device for emitting a detecting light with lighting-error angle, image sensor with sensing-error angle, and parameter calculating circuit. First part of detecting light passes transflective plate and is reflected by calibrating object and becomes first reflecting light emitting to first imaging location of image sensor while second part of detecting light is reflected by transflective plate and becomes second reflecting light emitting to second imaging location of image sensor. Parameter-calculating circuit calculates lighting-error angle and sensing-error angle according to first and second known distances, and first and second imaging locations.