Tiltmeter-Integrated RASNIK Alignment Monitor for Motion Discrimination
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Solution Overview
Problem
Existing systems for real-time monitoring of precise relative positions and alignments of components, such as in high-energy physics experiments, face limitations in distinguishing between pure translations and rotations, and require multiple systems aligned in different directions to achieve accurate alignment data.
Innovation Solution
Incorporating a tiltmeter into a two-element RASNIK system to measure the tilt between the projector and camera units, allowing for the differentiation between translational and rotational movements using a single system, and providing real-time visual feedback on relative positions and contact information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single RASNIK system is used to monitor relative position, then the system complexity is reduced, but the ability to distinguish between translational and rotational movements is insufficient
Solution Approach 1:
The RASNIK system is enhanced by integrating a tiltmeter, allowing a single system to perform multiple functions: both optical position monitoring and tilt measurement. This multi-functionality enables the system to distinguish between translational and rotational movements without requiring additional separate systems, thus reducing overall complexity while maintaining measurement precision.
Solution Approach 2:
A tiltmeter is introduced as an intermediary device that measures tilt independently. This intermediary measurement capability allows the system to differentiate between image shifts caused by translation versus those caused by rotation, resolving the ambiguity that would otherwise require multiple RASNIK systems.
2Measurement precision
If multiple RASNIK systems are aligned in different directions to achieve accurate alignment data, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
By making the single RASNIK system multi-functional through tiltmeter integration, it can perform the work of multiple systems. The tiltmeter provides rotational information that complements the translational information from the optical system, enabling comprehensive alignment monitoring without requiring multiple separate RASNIK systems aligned in different directions.
Solution Approach 2:
The optical position monitoring function and the tilt measurement function are merged into a single integrated system. This combination allows the system to simultaneously measure both translation and rotation, achieving the measurement precision that would otherwise require multiple separate systems while reducing device complexity.
3Device complexity
If a two-element RASNIK system is used, then the device complexity is reduced compared to three-element systems, but the ability to provide complete alignment information is limited
Solution Approach 1:
The two-element RASNIK system is enhanced by adding tiltmeter functionality, making it multi-functional. This allows the simplified two-element structure to provide complete alignment information by combining optical position data with independent tilt measurements, preventing any loss of alignment information despite the reduced number of optical elements.
Solution Approach 2:
The tiltmeter serves as an intermediary that provides the missing rotational information. By measuring tilt independently, it compensates for the reduced optical element count, ensuring that complete alignment information (both translational and rotational) is available despite using a simpler two-element configuration.
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
Enables accurate discrimination between translational and rotational motions with a single system, improving data interpretation and reducing the need for multiple aligned RASNIK systems, while providing intuitive and high-resolution alignment monitoring suitable for industrial and high-energy physics applications.
Implementation Method 1
illuminating a coded mask with a diffuse light source, such that a pattern of the coded mask is projected through a lens to a camera positioned to receive a focused image of the mask from the lens
Implementation Method 2
measuring, with a tiltmeter, an amount of tilt of the projector or camera with respect to a reference line between the projector and the camera
Data Source
AI summary
A tiltmeter-integrated two element optical relative alignment monitor provides relative alignment and contact sensing and can provide precise information regarding the nature of physical contact experienced by objects being monitored. A computer monitor can display the information in real time, in an intuitive manner. This system can provide all the information with good resolution in a low-cost, easily installable package for a wide variety of research, high energy physics applications, and industrial uses. A projector unit is mounted on one component containing a diffuse light source, a coded mask, and a lens. The projector is aligned with a camera to receive the focused image. Shifts in the image of the mask indicate relative motion between the camera and the projector unit. A tiltmeter is affixed to either the camera or projector, to distinguish between image shifts due to translational movement and image shifts due to rotation or tilting.