Fused LIBS Optimization With Shock and Stress Wave Diagnosis
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Solution Overview
Problem
Existing LIBS systems lack intuitive understanding of enhancement mechanisms and are prone to volatility and blindness in optimizing spectral enhancement measures and system parameters, often complicating the optical path structure and increasing costs with additional devices.
Innovation Solution
Integrate piezoelectric ultrasonic transducers and an oscilloscope to measure shock wave and stress wave intensities alongside spectral signals without altering the original LIBS system, allowing for simultaneous diagnosis and optimization of spectral enhancement measures and system parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional laser diagnosis technologies (shadowing, schlieren, interference) are added to characterize enhancement mechanisms, then the understanding of enhancement mechanism is improved, but the optical path structure becomes complex and debugging difficulty increases
Solution Approach 1:
The patent replaces complex optical diagnosis systems (shadowing, schlieren, interference) with a piezoelectric ultrasonic transducer-based mechanical sensing system. The transducer converts mechanical stress waves into electrical signals, providing a simpler alternative to optical methods for characterizing laser-induced plasma expansion and shock wave dynamics.
Solution Approach 2:
The piezoelectric ultrasonic transducer acts as an intermediary between the laser-induced plasma process and the measurement system. It converts the mechanical stress waves generated by laser ablation into measurable electrical signals, enabling diagnosis without directly observing the plasma optically, thus simplifying the overall system.
2Loss of information
If image diagnosis technology using ICCD cameras is used, then the diagnosis capability is improved, but the cost increases significantly (hundreds of thousands of yuan)
Solution Approach 1:
The patent employs inexpensive piezoelectric ultrasonic transducers (costing fractions of the price of ICCD cameras) to achieve the required diagnosis capability. These transducers are readily available, low-cost components that provide sufficient measurement accuracy without requiring expensive imaging equipment.
Solution Approach 2:
The invention substitutes expensive optical imaging systems (ICCD cameras) with a mechanical sensing approach using piezoelectric transducers. This replacement maintains the ability to diagnose plasma expansion and shock wave characteristics while dramatically reducing cost.
3Loss of information
If additional strong continuous background laser or short pulse light source is added to LIBS system, then the diagnosis function is improved, but the spectral collection is interfered with and simultaneous detection is failed
Solution Approach 1:
The patent replaces optical diagnosis methods that require additional laser sources with a mechanical sensing system using piezoelectric transducers. This substitution eliminates the need for extra light sources that would interfere with spectral collection, enabling simultaneous LIBS analysis and diagnosis.
Solution Approach 2:
The piezoelectric ultrasonic transducer serves as an intermediary that measures mechanical stress waves without requiring additional optical components. This allows the original LIBS optical path to remain uninterrupted for spectral collection while still providing comprehensive diagnosis capability.
4Device complexity
If optimization process depends only on spectral intensity effect characterization, then the system remains simple, but volatility and randomness are caused and blind debugging occurs
Solution Approach 1:
The patent introduces real-time feedback from piezoelectric ultrasonic transducers that monitor stress wave characteristics during laser ablation. This feedback mechanism provides direct information about plasma expansion and shock wave dynamics, enabling reliable optimization of spectral enhancement parameters based on actual physical conditions rather than random spectral intensity measurements.
Solution Approach 2:
The invention adds a new measurement dimension by incorporating mechanical stress wave detection alongside spectral intensity measurement. This multi-dimensional approach (adding mechanical field measurement to optical field measurement) provides complementary information that reduces volatility and randomness in optimization while maintaining system simplicity.
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
Improves the robustness and accuracy of LIBS parameter optimization by adding dimensions of shock wave and stress wave measurements, reducing data fluctuation and avoiding blind parameter debugging, while maintaining a simple structure and low cost.
Implementation Method 1
adding diagnosis devices such as piezoelectric ultrasonic transducers and an oscilloscope, a spectral signal can be measured on the basis that the original LIBS measurement system is not changed, at the same time, a shock wave intensity in an environmental medium and a stress wave intensity propagating along a target surface can be detected
Implementation Method 2
High-power pulsed laser emission is focused on a surface of a sample, which can make the laser irradiance near an ablation point on the surface reach the order of ̃GW/cm2. Parts of targets are heated rapidly, and then are melted, gasified and ionized to form plasmas
Implementation Method 3
High-power pulsed laser emission is focused on a surface of a sample, which can make the laser irradiance near an ablation point on the surface reach the order of ̃GW/cm2. Parts of targets are heated rapidly, and then are melted, gasified and ionized to form plasmas
Implementation Method 4
a shock wave intensity in an environmental medium and a stress wave intensity propagating along a target surface can be detected
Implementation Method 5
adding diagnosis devices such as piezoelectric ultrasonic transducers
Data Source
AI summary
The present disclosure discloses a stress and shock wave diagnosis fused LIBS optimization system and method, including: collecting a shock wave signal, a stress wave signal and a spectral signal of a detected object subjected to pulsed laser ablation under the current parameter; pre-processing the spectral signal to obtain a spectral intensity of the detected object under the current parameter; processing the shock wave signal and the stress wave signal to obtain a shock wave intensity and a stress wave intensity under the current parameter; adjusting optimization variables until optimization measurement and diagnosis of a spectral enhancement measure or system parameter are completed. Information on other two dimensions is added for an optimization process; and proportions of shock wave propagation in incident laser energy and mechanical stress propagation in a target can be intuitively recognized, so that the scientificity and persuasiveness of an optimization result are improved.