Rotating Turntable Optical Sensor for Curved Surface Roughness
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Solution Overview
Problem
Existing surface roughness measurement technologies face challenges in accurately measuring curved surfaces and maintaining consistent light reflection due to variations in distance and angle between the optical sensor and the object, especially when the object is rotated.
Innovation Solution
A measuring apparatus with a rotatable support plate and an optical sensor comprising a light-emitting and light-receiving element, where the optical sensor is secured above the support plate to irradiate and receive light from the object while the support plate rotates, minimizing variations in distance and angle, and allowing for measurement of both curved and flat surfaces with improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the optical sensor is moved to track different points on the object during rotation, then measurement coverage is improved, but device complexity and operational difficulty increase
Solution Approach 1:
Instead of moving the optical sensor to track different points on the rotating object, the invention inverts the approach by keeping the sensor stationary and rotating the object on a turntable. This allows the sensor to measure multiple points throughout the object's rotation without requiring complex sensor positioning mechanisms, thereby maintaining measurement coverage while reducing device complexity.
2Measurement precision
If the optical sensor is positioned close to the object for detailed measurement, then measurement precision is improved, but variations in distance and angle during rotation increase
Solution Approach 1:
The invention creates an equipotential measurement environment by positioning the optical sensor directly above the center of the turntable's rotation axis. This vertical alignment ensures that during rotation, the distance and angle between the sensor and any point on the object's surface remain constant, eliminating variations that would otherwise occur with off-center positioning. This maintains both measurement precision and stability simultaneously.
3Productivity
If the turntable rotates at high speed for efficient measurement, then productivity is improved, but measurement accuracy may deteriorate due to motion blur or vibration
Solution Approach 1:
The invention utilizes periodic action by rotating the turntable at controlled speeds and synchronizing the optical sensor's measurement cycles with the rotation period. This allows multiple measurements to be taken at different rotational positions and combined to reconstruct the complete surface profile, maintaining accuracy while improving productivity through efficient use of rotational motion.
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 configuration enables precise measurement of surface conditions, including curved surfaces, by maintaining a consistent light path and reducing stray light, thus enhancing measurement accuracy and extending the measurement range without the need for complex adjustments.
Implementation Method 1
an optical sensor disposed above the support plate and including a light-emitting element that irradiates the object with light and a light-receiving element that receives reflection light reflected from the object
Data Source
AI summary
A measuring apparatus according to the present disclosure includes a support plate and an optical sensor. The support plate has an upper surface on a central portion of which an object is to be mounted, and is rotatable about an axis of rotation extending vertically from the central portion. The optical sensor is disposed above the support plate, and has a light-emitting element configured to irradiate the object with light and a light-receiving element configured to receive reflection light reflected from the object.