ICP Analyzer Plasma Torch Type Detection via Resonance Frequency
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Solution Overview
Problem
The manual setting of plasma torch types in ICP analyzers can lead to incorrect radio-frequency power and gas supply, causing excessive plasma torch erosion and damage due to electrical noise interference, making it difficult to detect the correct torch type using electrical devices.
Innovation Solution
An ICP analyzer with a self-oscillation power supply unit, including a frequency measurement section, storage for reference output frequencies, and a torch checker to determine if the measured output frequency matches the reference frequencies, providing notification for correct or incorrect torch types, and optionally using a torch-lighting detector to ensure accurate plasma ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual setting of plasma torch type is used, then ease of operation is maintained, but reliability deteriorates due to incorrect settings causing torch erosion and damage
Solution Approach 1:
The system automatically detects plasma torch type by measuring the resonance frequency of the induction coil, eliminating the need for manual operator input. The control unit autonomously identifies the torch type and adjusts power supply parameters accordingly, making the system self-configuring and preventing incorrect settings that lead to torch damage.
Solution Approach 2:
The system measures the actual resonance frequency of the induction coil-plasma torch system and compares it against stored reference values to identify the torch type. This feedback mechanism ensures accurate automatic recognition and appropriate parameter adjustment, preventing mismatched operating conditions that cause torch erosion.
2Measurement precision
If electrical devices are used to detect plasma torch type, then measurement precision is improved, but device complexity increases due to electrical noise interference from radio-frequency current
Solution Approach 1:
The patent replaces complex electrical detection devices with a simpler electromagnetic resonance measurement approach. By measuring the resonance frequency of the LC oscillation circuit formed by the induction coil and capacitor, the system identifies torch type without requiring additional sensors or switches, thus avoiding electrical noise interference while maintaining detection accuracy.
Solution Approach 2:
The resonance frequency measurement serves multiple functions: it characterizes the plasma torch type, monitors plasma ignition status, and provides feedback for power supply control. This multi-functional approach eliminates the need for separate detection devices, reducing system complexity while maintaining 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
The system accurately identifies the installed plasma torch type, preventing damage by ensuring correct power and gas supply settings, and allowing for automatic adjustment of radio-frequency power levels to match the actual torch type, thus ensuring safe and effective operation.
Implementation Method 1
a plasma torch 110 into which a stream of gas for forming plasma is introduced; an induction coil 111 wound around the plasma torch
Implementation Method 2
an LC oscillation circuit is formed by a capacitor provided in the power source and the induction coil surrounding the plasma torch. The oscillation generated by this circuit produces a stable supply of radio-frequency power
Data Source
AI summary
An ICP analyzer 100 includes a self-oscillation radio-frequency power supply unit 120 for supplying radio-frequency power for generating plasma to an induction coil 111 wound around a plasma torch 110. To check the type of plasma torch 110, the analyzer 100 further includes: a frequency measurement section 121 for measuring an output frequency of the power supply unit 120; a storage unit 190 holding a reference output frequency for each type of plasma torch; and a torch checker 132 for determining whether or not the output frequency measured by the frequency measurement section 121 after the plasma is lit agrees with any one of the reference output frequencies, and for giving notification of the determination result.