Laser Pointing System Shadow Zone Compensation
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Solution Overview
Problem
In laser optical beam treatment systems, the transmission of the treatment beam often disturbs the imaging system, especially when the target is small, leading to inaccurate positioning of the treatment beam due to interference from the illumination beam using the same optical circuits.
Innovation Solution
A system that uses a non-reflecting zone on a first mirror to allow the treatment beam to pass through while allowing reflected light to return to the imaging system, with a second mirror for angular adjustment to avoid shadow zones and a control circuit to shift the treatment beam based on imaging data, ensuring precise targeting without disturbing the imaging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the treatment beam is transmitted through the same optical circuits as the illumination beam, then the system complexity is reduced, but the imaging precision deteriorates due to interference from the treatment beam
Solution Approach 1:
The first mirror is divided into a reflective zone and a non-reflecting zone. The non-reflecting zone allows the treatment beam to pass through without being reflected into the imaging system, while the reflective zone directs illumination light to the imaging system. This segmentation resolves the interference problem while maintaining a relatively simple optical circuit.
2Reliability
If a non-reflecting zone is created on the first mirror to allow treatment beam passage, then the treatment beam transmission is improved, but a shadow zone is induced towards the imaging system
Solution Approach 1:
The system performs preliminary actions to compensate for the shadow zone effect. The control circuit measures the shadow zone position and size, calculates the displacement amount, and shifts the treatment beam in advance by this calculated amount. This preliminary compensation ensures that the treatment beam accurately targets the intended location despite the shadow zone interference.
Solution Approach 2:
The control circuit uses feedback from the imaging system to measure the shadow zone characteristics and automatically adjusts the treatment beam position. The imaging system provides real-time information about the shadow zone, and the control circuit uses this feedback to calculate and apply the necessary beam shift, ensuring accurate targeting.
3Measurement precision
If the treatment beam is angularly shifted to avoid the shadow zone, then the imaging system interference is reduced, but additional control mechanisms are required
Solution Approach 1:
The second mirror serves multiple functions: it directs the treatment beam toward the target and simultaneously enables angular adjustment to compensate for the shadow zone. The control circuit performs multiple tasks: measuring shadow zone characteristics, calculating displacement amounts, and controlling the angular adjustment of the second mirror. This multi-functionality reduces the need for separate dedicated components.
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 targeting of the treatment beam on small targets by shifting the shadow zone in the imaging system, allowing for accurate positioning and minimizing interference, thus improving the overall efficiency and accuracy of the laser pointing system.
Implementation Method 1
a first mirror (M1) on which a non-reflecting zone (z1) has been created, this zone (z1) allowing the passage of the treatment beam (FS1) while the first mirror (M1) makes it possible to direct light (FR2) reflected by the target (C1) towards the imaging system (3)
Implementation Method 2
The system further comprising a spectral filter located between the first mirror and the imaging system and allowing the transmission of the second wavelength or range of wavelengths only to the imaging system
Implementation Method 3
at least one treatment laser source making it possible to emit a treatment laser beam towards a target, said treatment beam being transmitted through a non-reflecting zone of a first mirror
Implementation Method 4
a second mirror receiving said treatment beam, intended to direct it and reflect it towards the target
Data Source
Figure 1
Figure 2a~2e
Figure 3~5
AI summary
The invention relates to a laser-beam pointing system characterised in that it comprises: at least one treatment laser source (S1) for emitting a treatment laser beam (FS1, FS2) towards a target (C1), said treatment beam (FS1) being emitted through a non-reflecting area (Z1) of a first mirror (M1), said mirror (M1) enabling the feedback towards an imaging system (CA) receiving a lighting beam (FR2) reflected by the target, said low-reflection coefficient area (Z1) of the first mirror (M1) generating a shadow area (ZA) towards said imaging system (CA); a second mirror (M2) for receiving the treatment beam and for orienting and reflecting the same towards the target; a lighting source (E1) for lighting said target with the lighting beam (FE1); a first control circuit (CC) for controlling the orientation of said pointing system towards the target; a second control circuit (CT) for angularly offsetting the treatment beam (FS1) by a predetermined angle, for measuring, from an image obtained by the imaging system, the distance (D2) between the position of an area (P1) of the target and the position of the spot of the treatment beam, and for offsetting the lighting beam in the opposite direction by an angle corresponding to the measured distance (D2), the angular offset of the treatment beam having an amplitude such that the shadow area does not interfere in the measurement of the target position. The invention can be used in laser imaging systems.