3D Laser Triangulation Scanner Synchronization
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Solution Overview
Problem
Conventional three-dimensional imaging apparatuses using non-contact laser triangulation sensors fail to accurately measure the amount of laser light reflected from an object's surface due to synchronization issues between encoder pulse signals and CCD reset timing, leading to incorrect light measurement and distorted image generation.
Innovation Solution
A scanning apparatus is developed with a processing unit that generates timing signals to control the reset timing of a photosensitive detector, ensuring accurate measurement of laser light by irradiating a certifying laser after one timing signal for a period shorter than the interval, and determining the measurement laser light's amount based on the certifying laser light measured, thus maintaining the light within the CCD's charge storage range regardless of surface reflectivity or distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the encoder pulse signal timing is not synchronized with the CCD reset timing, then the apparatus can operate without complex synchronization control, but the measured amount of reflected light becomes incorrect
Solution Approach 1:
The system performs preliminary synchronization by generating timing signals that align the CCD reset timing with the encoder pulse signal before measurement begins. This preliminary action ensures that the integration period of the CCD coincides with the desired measurement window, preventing incorrect light amount measurement while maintaining operational simplicity.
Solution Approach 2:
The system uses feedback from the encoder pulse signal to adjust and control the CCD reset timing. By monitoring the encoder pulse timing and adjusting the reset signal accordingly, the system ensures accurate synchronization between the scanning position and the light measurement, thereby achieving precise light amount measurement without complex manual synchronization.
2Quantity of substance
If the laser light emission duration is long, then sufficient light is captured for measurement, but the light amount exceeds the CCD's charge storage range causing saturation
Solution Approach 1:
The system dynamically adjusts the laser light emission duration based on real-time measurement conditions and distance to the object. By making the emission duration variable rather than fixed, the system can optimize the balance between capturing sufficient light and avoiding CCD saturation, thereby maintaining measurement accuracy across varying conditions.
Solution Approach 2:
The system changes the temporal parameter of laser emission by adjusting the pulse width or duration of laser light based on the measured distance and reflectivity. This parameter adjustment ensures that the total light energy remains within the CCD's charge storage capacity while still providing adequate signal for accurate measurement.
3Measurement precision
If the laser light intensity is increased to improve signal strength, then measurement sensitivity improves, but the dynamic range for varying reflectivity and distances is reduced
Solution Approach 1:
The system dynamically adjusts the laser light intensity based on the distance to the object and the reflectivity characteristics of the surface being measured. This dynamic adjustment allows the system to maintain optimal signal strength for sensitive detection while adapting to various measurement conditions, thereby preserving a wide dynamic range across different scenarios.
Solution Approach 2:
The system changes the intensity parameter of the laser light source according to real-time feedback from distance measurement and surface reflectivity assessment. By adjusting the light intensity parameter adaptively, the system achieves high signal detection sensitivity for distant or low-reflectivity surfaces while avoiding saturation for close or high-reflectivity surfaces, thus maintaining versatility across a wide dynamic range.
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 solution enables the generation of clear and correct three-dimensional images by ensuring accurate light measurement and contrast information assignment to the correct coordination of shape data, with the apparatus maintaining a constant light intensity and wide dynamic range for varying reflectivity and distances.
Implementation Method 1
a laser source to emit a laser light
Implementation Method 2
the laser light reflected from a surface of the object
Implementation Method 3
a photosensitive detector having a plurality of sensor elements to detect an imaging position of the laser light from the second optical unit
Data Source
AI summary
A non-contact laser triangulation scanning apparatus for generating a three-dimensional image of the surface of an object based on the 3D surface position and surface contrast information. The apparatus comprises a laser source, a first optical unit, a second optical unit, a photosensitive positional detector having a plurality of sensor elements, and an incident light measurement device. According to generated timing signals having a predetermined time interval, a reset timing of the sensor elements of the photosensitive positional detector is controlled. The incident light measurement device measures an amount of a certifying laser light after one timing signal. An amount of a measurement laser light is determined dependent on the measured amount of the certifying laser light. The three-dimensional image is generated by combining position data derived from signals of the positional detector with contrast data derived at least from signals of the incident light measurement device.