Charged Particle Detector Electrode Segmentation for Polarity Adaptability
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Solution Overview
Problem
Conventional charged-particle detectors for time-of-flight mass spectrometry face challenges in maintaining stable ion flight loci and detection accuracy due to changes in voltage states between cation and anion detection, leading to differing potential distributions and output waveforms.
Innovation Solution
A charged-particle detecting apparatus with a specific electrode configuration, including a first electrode, an MCP, a second electrode, and a third electrode arranged along a reference axis, along with capacitors to stabilize potential distribution and suppress signal ringing, ensuring consistent detection performance across different voltage states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If voltage applied to electrodes is changed between cation and anion detection, then detection of both polarities is enabled, but potential distribution near detecting surface differs causing ion flight loci to differ
Solution Approach 1:
The electrode system is segmented into multiple electrodes (first electrode, second electrode, third electrode) arranged along the reference axis. Each electrode can be independently controlled to maintain stable potential distribution near the detecting surface regardless of the polarity being detected, thus resolving the contradiction between versatility and measurement precision.
Solution Approach 2:
The patent applies parameter changes by adjusting the voltage applied to each electrode segment according to the detection mode (cation or anion). This allows the potential distribution near the detecting surface to be maintained stable while still enabling detection of both polarities, thus resolving the contradiction between adaptability and measurement precision.
2Adaptability or versatility
If voltage-applied state to electrodes differs for cation and anion detection, then both ion types can be detected, but output waveforms differ causing satisfactory detection results for reverse polarity
Solution Approach 1:
The patent implements dynamic control of electrode voltages based on the detection mode. The voltage applied to each electrode is dynamically adjusted according to whether cation or anion detection is performed, allowing the system to maintain optimal detection conditions for both polarities while ensuring consistent output waveforms and reliable detection results.
3Measurement precision
If capacitor is arranged between anode electrode and core to suppress waveform distortion, then cation detection performance is improved, but anion detection may not achieve satisfactory results
Solution Approach 1:
The capacitor arrangement between the anode electrode and core is designed to serve multiple functions: it suppresses waveform distortion for both cation and anion detection. This universal design ensures that the waveform suppression effect is maintained regardless of the polarity being detected, thus resolving the contradiction between measurement precision and adaptability.
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 apparatus achieves stable detection of charged particles regardless of polarity, with improved detection accuracy and suppressed signal distortion, maintaining equivalent performance for both cation and anion detection.
Implementation Method 1
a MCP (micro channel plate) which is arranged on a plane crossing the reference axis and emits secondary electrons multiplied therein in response to incidence of charged particles
Implementation Method 2
a capacitor is formed between the anode electrode 4 and the core 601, so that the detection signal is outputted to the outside at a ground potential
Implementation Method 3
the capacitor formed between the casing 5x and the OUT electrode 3 suppresses waveform distortion or ringing of the output signal
Data Source
AI summary
The present invention relates to a charged-particle detecting apparatus having a structure which enables adjustment of a potential distribution so as to stably maintain flight loci of charged particles without depending on a change in a voltage-applied state. The charged-particle detecting apparatus comprises a first electrode, an MCP, a second electrode, a third electrode that functions as an anode, and a rear cover arranged in order along a predetermined reference axis. The third electrode is arranged on the opposite side of the MCP with respect to the second electrode, and is electrically connected to an output signal part via a capacitor. In particular, the first electrode is arranged so as to become a part of the outer surface of the charged-particle detecting apparatus, and components positioned between the first electrode and the rear cover have contours with section sizes equal to or smaller than that of the contour of the first electrode when viewed from the first electrode side toward the rear cover.