Ion Detector Vibration Isolation in Mass Spectrometers
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Solution Overview
Problem
Mass spectrometers face challenges in maintaining high accuracy due to noise in detection signals caused by mechanical vibrations from turbomolecular pumps, which are difficult to filter out and interfere with the measurement signals.
Innovation Solution
A mass spectrometer design where the detector is fixed to the vacuum chamber via a cushioning member, specifically using a turbomolecular pump attached to the outer surface of the chamber, absorbs vibrations and reduces noise in the detection signal by isolating the vibration-sensitive signal extraction part with a cushioning member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a turbomolecular pump is directly connected to the vacuum chamber to achieve high vacuum, then vacuum performance is improved, but mechanical vibration is transmitted to the detector causing noise
Solution Approach 1:
A cushioning member is introduced as an intermediary element between the vacuum chamber and the detector. This cushioning member absorbs mechanical vibrations from the turbomolecular pump before they reach the detector, thereby reducing noise in the detection signal while maintaining the vacuum connection.
Solution Approach 2:
The cushioning member is pre-installed between the vacuum chamber and the detector to provide vibration absorption before the vibration problem occurs during pump operation. This preventive measure ensures that mechanical vibrations are dampened before they can affect the detector's measurement accuracy.
2Stability of the object's composition
If the detector is directly fixed to the vacuum chamber for stable positioning, then positioning stability is improved, but vibration from the pump is transmitted to the detector
Solution Approach 1:
The cushioning member serves as a mediator that maintains the mechanical connection between the vacuum chamber and the detector while filtering out harmful vibrations. This allows the detector to remain stably positioned without directly transmitting pump-induced vibrations.
Solution Approach 2:
The cushioning member is specifically placed at the connection point between the vacuum chamber and the detector, providing localized vibration absorption only where needed. This allows other parts of the detector assembly to maintain their structural integrity and positioning stability without being affected by pump vibrations.
3Strength
If rigid fixation is used to secure the detector to the vacuum chamber, then fixation strength is improved, but vibration noise is transmitted to the detection signal
Solution Approach 1:
The cushioning member acts as a vibration-absorbing intermediary in the fixation path between the vacuum chamber and the detector. It maintains sufficient mechanical strength for secure fixation while selectively absorbing high-frequency vibrations that would otherwise be transmitted to the detector.
Solution Approach 2:
The cushioning member is made of materials with specific damping properties that combine adequate mechanical strength for fixation with high vibration absorption capability. This composite approach allows the fixation structure to simultaneously achieve both strength and vibration isolation.
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
This configuration effectively reduces noise in the detection signal, enhancing mass accuracy and detection sensitivity by minimizing the impact of mechanical vibrations from the vacuum pump.
Implementation Method 1
the detector is fixed to the vacuum chamber via a cushioning member... absorbs vibrations and reduces noise in the detection signal
Data Source
AI summary
Flanges (10a) of an attachment plate (10) integrally combined with an ion detector (5) are fixed to an inner surface of a vacuum chamber (1) via cushioning members (12), such as O-rings. Although the vacuum chamber (1) mechanically vibrates due to a turbomolecular pump attached to it, this vibration is absorbed by the cushioning members (12), whereby the vibration of the ion detector (5) is suppressed. As a result, the noise which occurs with a vibration of the ion detector (5) and is superposed on the detection signal is reduced. Thus, the quality of the detection signal can be improved by a simple and inexpensive structure.