Laser Beam Alignment Using Oscillating Deflectors
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Solution Overview
Problem
The alignment of a laser beam with an ionizing chamber and ion cloud in mass spectrometry is challenging due to thermal cycling and mechanical vibrations, requiring frequent adjustments and expertise, leading to increased costs and time losses.
Innovation Solution
The use of mirror galvanometers or acousto-optic modulators as beam deflectors, which can be electronically controlled to automate the alignment process, allowing for precise manipulation of the laser beam path and frequency adjustments to maintain alignment, even in the presence of disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static optical mounting hardware is used for laser alignment, then initial alignment can be achieved, but thermal cycling and mechanical vibrations cause beam misalignment requiring frequent corrections
Solution Approach 1:
The patent applies dynamics by replacing static optical mounting hardware with dynamic alignment correction mechanisms. The system uses movable mirrors or beam deflectors that can be adjusted in real-time to compensate for thermal cycling and mechanical vibrations, transforming the alignment system from static to dynamically adaptive, thereby maintaining reliable alignment without frequent manual corrections
Solution Approach 2:
The patent implements feedback through alignment detection systems that monitor beam position and provide signals to correction mechanisms. This closed-loop feedback system automatically detects misalignment caused by environmental disturbances and triggers corrective actions, eliminating the need for manual intervention and reducing alignment correction time
2Ease of operation
If manual alignment adjustment is performed by trained personnel, then beam alignment can be corrected, but it requires expert knowledge and significant time investment
Solution Approach 1:
The patent applies self-service by implementing automated alignment systems that perform alignment corrections without human intervention. The system uses sensors to detect beam position and automatically actuates correction mechanisms, making the alignment process self-regulating and eliminating dependence on expert personnel, thereby simplifying operation while managing complexity through automation
Solution Approach 2:
The patent replaces manual mechanical adjustment operations with automated electronic control systems. Instead of requiring personnel to physically adjust optical components, the system uses electronic signals to control motorized mirrors or acousto-optic deflectors, substituting complex manual mechanical operations with simpler electronic control while maintaining alignment capability
3Reliability
If frequent alignment corrections are made in the field, then beam alignment is maintained, but costs and downtime increase
Solution Approach 1:
The patent applies preliminary action by implementing alignment correction capabilities that are prepared and ready before misalignment occurs. The system continuously monitors beam position and has pre-programmed correction routines ready to execute immediately upon detecting alignment deviations, preventing productivity loss rather than reacting after downtime occurs
Solution Approach 2:
The patent ensures continuity of useful action by maintaining constant beam alignment through real-time monitoring and correction. The alignment system operates continuously without interruption, ensuring the laser beam remains properly aligned with the ion cloud throughout operation, thereby eliminating downtime and maintaining full productivity
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 stable and efficient alignment of the laser beam with the ion cloud, reducing the need for manual adjustments and expert intervention, thereby minimizing downtime and costs while ensuring accurate ion fragmentation and analysis.
Implementation Method 1
the first and second beam deflectors can be mirror galvanometers
Implementation Method 2
the first and second beam deflectors can be acousto-optic modulators
Implementation Method 3
Laser light can be used to induce fragmentation of the gas-phase ions to provide additional information about the ions
Data Source
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AI summary
A mass spectrometry system includes a laser source, a trapping volume, first and second beam deflectors, and a deflector controller. The first and second beam deflectors are arranged on a path from the laser source to the trapping volume. The first beam deflector is configured to oscillate in a first direction at a first frequency and the second beam deflector configured to oscillate in a second direction orthogonal to the first direction at a second frequency. The deflector controller is configured to scan a scanned area within the trapping volume with the laser by controlling the oscillation of the first and second beam deflectors to cause ions trapped within the trapping volume to fragment into fragment ions. The scanned area has a first dimension defined by the oscillation in first direction and a second dimension defined by the oscillation in the second direction.