Dynamic Illumination Control for Multi-Sensor Optical Measurement
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Solution Overview
Problem
Optical measuring apparatuses with multiple cameras often experience overexposure or inadequate illumination, leading to erroneous measurements due to unchanging illumination settings, which cannot be ideal for all camera positions.
Innovation Solution
A measuring apparatus and method that control illumination settings dynamically based on control signals from optical sensors, ensuring each sensor receives ideal illumination by switching the measurement illumination arrangement according to the image recording time periods of individual sensors, thereby minimizing overexposure and dazzling effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single unchanging illumination setting is used for multiple optical sensors, then the device complexity is reduced, but measurement precision deteriorates due to overexposure or inadequate illumination for specific camera positions
Solution Approach 1:
The illumination setting is changed from static to dynamic by making it dependent on the active optical sensor. The control device dynamically adjusts the illumination parameters (such as intensity, direction, or activation of specific illumination sources) based on which optical sensor is currently recording, ensuring optimal illumination conditions for each sensor's specific position and optical characteristics.
Solution Approach 2:
Different illumination settings are applied for different optical sensors based on their individual requirements. Each sensor receives a customized illumination configuration tailored to its position, optical axis, and measurement task, rather than using a universal illumination setting for all sensors.
2Measurement precision
If illumination settings are optimized for each optical sensor individually, then measurement precision is improved, but device complexity increases due to multiple illumination configurations
Solution Approach 1:
A single measurement illumination arrangement serves multiple optical sensors by being controlled in different settings for each sensor. The illumination system is designed to be multi-functional, capable of adapting its configuration based on which sensor is active, thereby providing sensor-specific optimization without requiring separate illumination systems for each sensor.
Solution Approach 2:
The illumination system adjusts its parameters (intensity, direction, spectral composition, timing) based on the active optical sensor. The control device modifies these parameters dynamically to match the requirements of each sensor, allowing a single illumination arrangement to serve multiple sensors with different optical characteristics and positions.
3Productivity
If the measurement illumination arrangement remains active during all image recording time periods, then productivity is improved by continuous illumination, but measurement precision deteriorates due to overexposure or dazzling effects for certain camera positions
Solution Approach 1:
The measurement illumination arrangement is activated periodically according to the image recording schedule of different optical sensors. The control device synchronizes the illumination activation with the specific time periods when each sensor is recording, turning the illumination on only when needed for each sensor's measurement cycle and turning it off during other sensors' recording periods or when no sensor is active.
Data Source
AI summary
A measuring apparatus includes first and second optical sensors for recording an image in an image capturing region during first and second image recording time periods, respectively. First and second control signal transducers provide first and second control signals, respectively, that represent the first and second image recording time periods, respectively. A control device controls a measurement illumination arrangement during the first image recording time period based on the first control signal and a first measurement illumination setting. The control device controls the measurement illumination arrangement during the second image recording time period based on the second control signal and a second measurement illumination setting. The second optical sensor is series connected to the first control signal transducer via a timing member. The first control signal is supplied to the timing member so that the second optical sensor is triggered by the first optical sensor via the timing member.