Shack Hartmann Sensor Removable Lenslet Array Kinematic Mount
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Solution Overview
Problem
Existing SH Wavefront Sensors require permanent fixation of the lenslet array to the CCD sensor for precise alignment, limiting the ability to change the micro-lens array without recalibration and restricting measurement accuracy.
Innovation Solution
A kinematic mount system with a base mounting plate, intermediate plate, and wavefront dissector plate allows for precise positioning of the lenslet array with six degrees of freedom, enabling removable and replaceable alignment without degrading measurement precision, using dowel pins and magnets for secure engagement and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lenslet array is permanently fixed to the CCD sensor, then alignment precision is maintained, but the ability to change or replace the lenslet array is lost
Solution Approach 1:
The system is divided into separate components: a removable lenslet array and a fixed CCD sensor platform. The lenslet array can be detached and replaced while the sensor remains stationary, enabling adaptability without compromising sensor alignment.
Solution Approach 2:
A precision alignment platform with kinematic mounting features serves as an intermediary between the removable lenslet array and the fixed CCD sensor. This intermediary maintains precise alignment relationships while allowing the lenslet array to be changed.
2Ease of operation
If the lenslet array is permanently fixed to the CCD sensor, then alignment stability is ensured, but device complexity increases due to calibration requirements
Solution Approach 1:
Alignment references and kinematic mounting features are pre-established on the sensor platform during manufacturing. This preliminary action ensures that when lenslet arrays are replaced, they automatically align with the pre-established references without requiring complex calibration procedures.
Solution Approach 2:
The kinematic mounting system provides self-aligning features that automatically position the lenslet array correctly relative to the sensor when mounted. This self-service alignment eliminates the need for manual calibration and reduces operational complexity.
3Adaptability or versatility
If the lenslet array is removable and replaceable, then adaptability is improved, but alignment precision may be degraded
Solution Approach 1:
The sensor platform incorporates specialized local features such as precision-machined alignment pins, V-grooves, and flat surfaces at specific locations. These localized precision features ensure that removable lenslet arrays align with the same precision as permanently fixed arrays, maintaining manufacturing precision while enabling interchangeability.
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 precise and repeatable alignment of the lenslet array relative to the CCD sensor, allowing for interchangeable microlens arrays without the need for recalibration, maintaining measurement accuracy and flexibility in optical configurations.
Implementation Method 1
A kinematic mount system with a base mounting plate, intermediate plate, and wavefront dissector plate allows for precise positioning of the lenslet array with six degrees of freedom
Implementation Method 2
using dowel pins and magnets for secure engagement and disengagement
Data Source
AI summary
A Shack Hartmann (“SH”) wavefront sensor comprising an optical device, such as a wave front dissector including a lenslet array, for transmitting, dissecting and focusing an incoming optical wave, an optical system, including, for example, an optical sensor, for receiving the transmitted incoming optical wave, and a removable kinematic mount for repeatable precision mounting of the optical device to the optical system.