Dynamic Light Beam Displacement via Dual Deflection Angles
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Solution Overview
Problem
Conventional light scanning microscopy techniques face limitations in scanning speed and precision, especially when imaging living biological samples, due to mechanical inertia and optical constraints, which result in inadequate scanning speeds and image quality for high-magnification objectives.
Innovation Solution
A device with two beam deflection means connected in series for each direction allows independent adjustment of deflection angles, enabling precise control of the light beam's position and angle within the pupil of the focusing optics, allowing for scanning without varying optical conditions across the area, and compensating for lens errors and mechanical inaccuracies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single beam deflection means (mirror) is used to scan in two directions, then the device complexity is reduced, but scanning speed and precision are limited due to mechanical constraints
Solution Approach 1:
The single beam deflection means is segmented into two separate beam deflection means (first and second), each responsible for deflecting the light beam in one of two perpendicular directions. This segmentation allows each component to operate independently at higher speeds without the mechanical constraints of a gimbal-mounted single mirror, thereby resolving the contradiction between device complexity and scanning speed.
2Productivity
If two separate rotating mirrors are arranged close to a single pupil image, then scanning in two directions is achieved, but geometric distortion and chromatic errors occur
Solution Approach 1:
A beam position detection device is introduced as an intermediary between the beam deflection means and the focusing optics. This detector monitors the beam position at the pupil plane and provides feedback to the control device, which adjusts the deflection angles to compensate for geometric distortion and chromatic errors, thereby maintaining optical accuracy while enabling two-directional scanning.
3Device complexity
If beam deflection means are arranged away from the pupil plane, then the optical structure is simplified, but image brightness varies sharply towards the edge of the scanning area
Solution Approach 1:
A feedback control system is implemented where the beam position detection device continuously monitors the beam position at the pupil plane and feeds this information back to the control device. The control device dynamically adjusts the deflection angles of the beam deflection means to ensure the beam remains properly positioned, maintaining uniform image brightness across the scanning area while allowing flexible optical structure design.
4Productivity
If high scanning speeds are achieved with conventional single-mirror systems, then productivity increases, but mechanical precision and stability deteriorate
Solution Approach 1:
The beam position detection device provides real-time feedback on beam positioning accuracy, and the control device uses this feedback to dynamically adjust the deflection angles of both beam deflection means. This closed-loop control system maintains high beam positioning precision even at high scanning speeds, resolving the contradiction between productivity and measurement precision.
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 high-speed, precise scanning of two-dimensional areas with minimal optical distortion, maintaining consistent image quality and reducing axial focus errors, particularly beneficial for high-resolution microscopy like STED, without requiring high-quality optical components.
Implementation Method 1
at least two beam deflection means (22, 23, 24, 25) connected in series for each direction in which the light beam (7) is to be deflected relative to the optical axis (4) of the focusing optics (4) in order to shift it in this direction within the scanning range (35) are provided
Data Source
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AI summary
In order to dynamically shift a light beam (7) relative to an optic which focuses the light beam so that an object can be scanned by the focused light beam (7) in a two-dimensional scanning field, the light beam (7) is deflected in two different directions relative to the optical axis of the optic to two points one after the other per direction, said deflections being done by two deflection angles (31 and 32 or 33 and 34) which change dynamically independent of one another.