Movable Sensor Positioning for Accurate Object Capture
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Solution Overview
Problem
Existing methods for capturing objects using optical sensors face inaccuracies due to unpredictable and varying capturing times, leading to measurement inaccuracies when assigning position values to sensor measurement signals, especially when the sensor is moved continuously relative to the object.
Innovation Solution
The method involves repeatedly ascertaining the instantaneous position of the sensor using a position measurement system and outputting sensor measurement signals at predetermined times, determining the capturing time point within the capturing interval, and combining position values to approximate the position at the capturing time for accurate coordinate determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the sensor captures the object continuously during movement, then measurement coverage is improved, but measurement precision deteriorates due to varying capturing times
Solution Approach 1:
The system pre-determines capturing time points within each capturing time interval before actual measurement occurs. By calculating these time points in advance based on expected sensor position and exposure duration, the system prepares reference points that will be used to accurately assign coordinates to measurement values even as the sensor moves continuously during capture.
Solution Approach 2:
The system changes the temporal parameters of measurement by introducing capturing time points that are calculated based on the duration of the capturing time interval. This parameter transformation allows the system to account for exposure time variations and assign accurate position values to measurement data taken during continuous sensor movement.
2Reliability
If the sensor exposure time is extended to capture moving objects, then measurement completeness is improved, but position assignment accuracy deteriorates
Solution Approach 1:
The system pre-calculates capturing time points within the exposure duration before the actual measurement occurs. By determining these reference time points in advance based on the expected capturing interval, the system can accurately map measurement values to sensor positions even when exposure time varies to ensure complete object capture.
Solution Approach 2:
The system uses the sensor's own movement characteristics and exposure duration to self-determine the capturing time points. By utilizing the relationship between sensor velocity, exposure time, and position change, the system automatically calculates the appropriate reference points without external intervention, enabling accurate position assignment that adapts to varying exposure requirements.
3Productivity
If the sensor moves continuously relative to the object, then measurement efficiency is improved, but measurement precision deteriorates due to position-signal timing mismatch
Solution Approach 1:
The system pre-determines capturing time points within each capturing interval before actual measurement occurs. By calculating these reference points in advance based on sensor position and exposure duration, the system creates a temporal framework that accurately links continuously acquired measurement data to corresponding sensor positions, resolving the timing mismatch problem.
Solution Approach 2:
The system dynamically adjusts the capturing time point calculation based on real-time sensor velocity and exposure duration. By making the time point determination adaptive to changing movement conditions rather than using fixed intervals, the system maintains accurate position-signal correspondence even during continuous sensor movement at varying speeds.
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
This approach allows for more accurate assignment of position values to sensor measurement signals, compensating for varying exposure times and dead times, thereby improving measurement accuracy by considering the actual point of object capture.
Implementation Method 1
The focusing optical unit effects dispersion of the radiation, i.e., chromatic aberration occurs. As a result, the radiation components of the different wavelengths are focused at different distances from the focusing optical unit.
Implementation Method 2
If an object that reflects the radiation back in the direction of the sensor is located in the respective focus (focal point or focal line), the sensor detects radiation of the wavelength with maximum intensity that was reflected in the focus.
Data Source
AI summary
A method and an arrangement for capturing an object by a movable sensor are provided. The method includes moving the sensor relative to the object and repeatedly ascertaining an instantaneous position of the sensor by a position measurement system, outputting the position to an evaluation device at a predetermined time point, repeatedly capturing the object by the sensor during a capturing time interval and outputting a measurement signal corresponding to the information captured during the capturing time interval. For at least one capturing time interval, a point in time of the capturing of the object is determined which lies within the capturing time interval, position values are ascertained and outputted at points in time which include the point in time of the capturing, and a position main value is ascertained based on the position values which approximates the position of the sensor at the point in time of the capturing.