Optical Sensor Sampling Precision Calibration
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Solution Overview
Problem
Conventional optical sensors for tracking movable devices face challenges in maintaining consistent sampling precision due to variations in lens magnification and distance, leading to differing motion tracking results despite identical motions.
Innovation Solution
A method and system for calibrating the sampling precision of optical sensors, involving reading precision variance and setting values, measuring actual precision, calculating a normalized value, and adjusting the measured precision to align with the setting precision, using a memory device and controller within the optical sensor or a remote host device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical sensor is used to track motion based on reflected light, then motion tracking capability is achieved, but sampling precision varies due to lens magnification and distance variations
Solution Approach 1:
The patent changes the parameter of sampling precision dynamically by applying a calibration value that compensates for lens magnification and distance variations. The controller adjusts the reported precision value based on measured deviations from expected precision under normal mode, thereby maintaining consistent tracking results across varying operational conditions.
2Ease of operation
If lens magnification and distance are not controlled, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the optical sensor measures its own sampling precision under normal mode, compares it with expected values, and generates a calibration value. This feedback loop allows the system to automatically compensate for variations in lens magnification and distance without requiring manual control, thus maintaining measurement precision while preserving ease of operation.
3Measurement precision
If calibration is performed to improve precision consistency, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent enables the optical sensor to perform self-calibration by measuring its own sampling precision and generating appropriate calibration values internally. The controller within the sensor handles the calibration process autonomously, eliminating the need for external calibration equipment or complex manual procedures. This self-service approach improves precision consistency while minimizing the increase in device complexity.
Data Source
AI summary
A method for calibrating a value of sampling precision of an optical sensor for tracking includes: reading a precision variance and a setting precision value from a memory device; measuring the sampling precision of the optical sensor under a normal mode to generate an actually measured precision value; calculating a normalized value that is proportional to the actually measured precision value according to the precision variance, the actually measured precision value, and the setting precision value; and, calibrating the actually measured precision value by using the normalized value.