Diffractive Laser Beam Bundle Compensation Without Feedback Control
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Solution Overview
Problem
Existing methods for compensating beam angle variation in laser beam bundles generated by diffractive optical elements require complex feedback control systems, which can be cumbersome and inefficient.
Innovation Solution
A method and arrangement that utilize a diffractive optical element to generate a beam bundle, where the beam angle variation is compensated by determining a beam angle value from a first subset of laser beams and using this value to evaluate and correct the light pattern projected by a second subset of laser beams, without the need for feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control systems are used to stabilize laser wavelength and compensate beam angle variation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the beam angle measurement function from the main measurement system by using a separate subset of laser beams (first subset) dedicated solely to determining beam angle values. This extracted measurement function operates independently and provides compensation data without requiring complex feedback control, thereby reducing overall system complexity while maintaining precision.
Solution Approach 2:
The patent introduces an intermediary evaluation step where the determined beam angle value is used to evaluate the light pattern detected by a second subset of laser beams. This intermediary evaluation process compensates for beam angle variations by taking into account the measured beam angle values, allowing accurate measurements without direct feedback control to the laser source.
2Stability of the object's composition
If closed-loop control is implemented to stabilize laser wavelength, then beam angle stability is improved, but ease of operation deteriorates
Solution Approach 1:
The system performs self-measurement and self-evaluation by using a portion of its own laser beams (first subset) to determine beam angle values and then using these values to evaluate and compensate the main measurement data (second subset). This self-service approach maintains beam angle stability through internal monitoring without requiring external feedback control mechanisms, thereby simplifying operation.
3Manufacturing precision
If beam angle variation compensation is performed using separate measurement and evaluation steps, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The patent merges the beam angle measurement function and the light pattern evaluation function into a unified processing approach. The beam angle values determined from the first subset of laser beams are directly integrated into the evaluation of the light pattern from the second subset, allowing simultaneous processing of both measurement aspects without requiring separate sequential operations, thereby maintaining productivity while improving 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 approach allows for effective compensation of beam angle variation, enabling precise control of laser beam patterns without the complexity of feedback systems, thus improving the accuracy and simplicity of laser-based applications.
Implementation Method 1
The laser light from a laser beam is deflected into defined beam angles by interference, so that complex patterns or beams can be generated from one laser beam.
Implementation Method 2
Diffractive optical elements (DOE) as defined in the disclosure may be used to generate a plurality of laser beams using only one laser beam from a laser source.
Data Source
AI summary
A method for compensating beam angle variation of a beam bundle of laser beams with respective beam angles includes generating the beam bundle using a diffractive optical element, determining a beam angle value from a beam angle of at least one laser beam of a first subset of the laser beams, detecting a light pattern projected by a second subset of the laser beams, and evaluating the light pattern. The evaluation is performed taking into account the beam angle variation of the beam angles of the second subset of the laser beams on the basis of the determined beam angle value.