Gas Laser Oscillator Anomaly Detection at Low Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional gas laser oscillators face damage due to excessive voltage or current when detecting anomalies in discharge loads, especially under high gas pressure, requiring complex measurement systems and risking destruction of the discharge tube and high-frequency power supply unit.
Innovation Solution
A method and apparatus that detect and compare actual output current values of the high-frequency power supply at a pressure lower than steady-state operation, discriminating anomalies by comparing with normal values, and controlling the power supply to prevent excessive voltage or current, using a data table for accurate diagnosis at various pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anomaly detection is performed during high-frequency power supply operation at high gas pressure, then discharge load anomalies can be detected, but excessive voltage or current may be applied causing destruction of the discharge tube or power supply unit
Solution Approach 1:
The patent performs anomaly detection at a low gas pressure state before the high-frequency power supply is fully activated and before gas pressure reaches high operating levels. By detecting anomalies in the current value at this preliminary low-pressure stage, the system can identify potential discharge load problems before excessive voltage or current conditions develop that would cause damage to the discharge tube or power supply unit.
2Ease of operation
If gas pressure is high during anomaly discrimination, then operational conditions are maintained, but the discharge tube or high-frequency power supply unit may be destroyed
Solution Approach 1:
The system performs anomaly discrimination at low gas pressure before high-frequency power supply operation begins. This preliminary detection at a safe pressure level allows operational monitoring capabilities to be implemented without exposing the discharge tube and power supply unit to the excessive stress conditions that would occur at high operating pressure, thereby preserving component durability.
3Reliability
If a separate container is used for detecting gas deterioration, then gas deterioration can be detected, but the device complexity increases
Solution Approach 1:
The patent combines the gas deterioration detection function with the existing high-frequency power supply unit by utilizing its current measurement capability. Instead of implementing a separate container with additional electrodes as in conventional approaches, the invention uses the same power supply unit to measure current values at low gas pressure, thereby achieving reliable gas deterioration detection while maintaining simple device structure.
Solution Approach 2:
The high-frequency power supply unit serves dual purposes: it provides power for laser operation and simultaneously performs gas deterioration detection by measuring current values. This self-service approach eliminates the need for separate dedicated detection equipment, reducing device complexity while maintaining reliable anomaly detection capability.
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
Prevents damage to the discharge tube and high-frequency power supply unit by safely discriminating gas composition anomalies at lower pressures, allowing for accurate diagnosis without excessive current or voltage, using a simple and effective comparison method.
Implementation Method 1
a discharge excitation type gas laser oscillator in which laser light is generated by discharge excitation of a laser gas in a discharge tube
Data Source
AI summary
A discharge excitation type gas laser oscillator has a discharge excitation unit for exciting a laser gas by discharge in a discharge tube to generate induced emission of laser light, a high-frequency power supply unit for supplying power to the discharge tube, and a controller unit for controlling output current of the high-frequency power supply unit. The laser oscillator further has an output detecting section that detects actual current value of the high-frequency power supply unit supplying power to the discharge tube at an arbitrary pressure lower than the high pressure during the steady-state operation, at the start of the laser oscillator, after the laser gas begins discharge excitation at a pressure lower than the high pressure during steady-state operation, an output comparison section that compares the detected actual current value with a normal current value that has been detected when the gas composition of the laser gas is normal at the same pressure as the actual current value is detected; and a power supply control section that discriminates, if the difference between the actual current value and the normal current value is equal to or greater than a preset value, that the gas composition of the laser gas is abnormal, and stops output of the high-frequency power supply unit.