Dynamic Crosstalk Compensation in Time of Flight Optical Receivers
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Solution Overview
Problem
Time of Flight (ToF) systems face interference from crosstalk, which can be exacerbated by environmental factors like smudges and imperfections, limiting their accuracy and requiring calibration that may not account for dynamic changes in operating conditions.
Innovation Solution
A method and system that utilize crosstalk-monitoring zones to collect photon-event data and generate dynamic crosstalk compensation values, adjusting native compensation values based on real-time data and temperature to improve the accuracy of ToF systems by reducing crosstalk interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed to reduce crosstalk interference, then measurement precision is improved, but the system cannot adapt to dynamic changes in operating conditions such as smudges and temperature variations
Solution Approach 1:
The patent implements dynamic crosstalk compensation by continuously monitoring photon events in crosstalk-monitoring zones during operation and updating compensation values in real-time. This dynamic approach allows the system to adapt to changing operating conditions such as smudges and temperature variations, resolving the contradiction between initial calibration precision and ongoing adaptability.
Solution Approach 2:
The system employs feedback mechanisms by monitoring photon events in dedicated crosstalk-monitoring zones and using this information to continuously adjust compensation values. This closed-loop feedback enables the system to maintain measurement precision while adapting to dynamic environmental changes, addressing both aspects of the contradiction.
2Adaptability or versatility
If crosstalk-monitoring zones are added to enable dynamic compensation, then adaptability is improved, but device complexity increases
Solution Approach 1:
The optical receiver is segmented into distinct functional zones: histogram regions for depth measurement and dedicated crosstalk-monitoring zones for detecting crosstalk photons. This segmentation allows the system to perform multiple functions simultaneously - depth imaging and crosstalk monitoring - without significantly increasing overall complexity, as each zone serves a specific purpose.
Solution Approach 2:
The crosstalk-monitoring zones serve multiple purposes: they detect crosstalk photons, provide data for dynamic compensation calculations, and can potentially contribute to overall depth measurement when combined with histogram region data. This multi-functionality justifies the added structural elements by providing multiple benefits from the same components.
3Measurement precision
If dynamic compensation values are calculated using photon-event data from multiple zones, then measurement precision is improved, but processing time and computational requirements increase
Solution Approach 1:
The system performs preliminary actions by continuously accumulating photon-event data in crosstalk-monitoring zones during the ranging operation itself, rather than requiring separate calibration steps. This preliminary data collection occurs in parallel with depth measurement, so the compensation values are ready when needed without adding time to the overall process.
Solution Approach 2:
The dynamic compensation process operates continuously throughout the ranging operation, using photon-event data accumulated in real-time. This continuous action ensures that compensation values are always up-to-date without requiring interruptions or additional time for separate calibration procedures, maintaining both precision and efficiency.
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 dynamic crosstalk compensation significantly reduces crosstalk errors, enhancing the accuracy and reliability of ToF systems by adapting to changing environmental conditions, such as smudges and temperature variations.
Implementation Method 1
Time of Flight (ToF) systems may operate by using optical pulses to project light into an environment and by using optical receivers to sense the light's return after reflection from objects in the environment
Implementation Method 2
measuring a first set of photon-event data collected from a first crosstalk-monitoring zone of an optical receiver
Data Source
AI summary
A method includes measuring a first set of photon-event data collected from a first crosstalk-monitoring zone of an optical receiver during a first period of time of flight ranging, measuring a second set of photon-event data collected from a second crosstalk-monitoring zone of the optical receiver during the first period of time of flight ranging, and generating a first dynamic crosstalk compensation value for a first histogram region of the optical receiver using the first set of photon-event data, the second set of photon-event data, and a native crosstalk compensation value for the first histogram region of the optical receiver.