Mass Filter Wave Detection With Parallel Rectifiers and Offset Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In mass spectrometry, poor linearity of rectifying devices leads to inadequate separation of mass spectrum peaks in large mass ranges, causing mass deviations due to non-linearity characteristics.
Innovation Solution
A mass spectrometer design incorporating a mass filter, a wave-detection unit with multiple rectifiers connected in parallel, and a cancellation circuit to cancel offset voltages caused by leakage currents, ensuring accurate mass-to-charge ratio detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single rectifying device is used in the wave-detection unit, then the device complexity is reduced, but the linearity of the leakage current deteriorates, causing mass deviation in large mass ranges
Solution Approach 1:
The wave-detection unit is segmented into multiple rectifying devices (first, second, third, and fourth rectifying devices) connected in parallel. Each rectifying device processes a portion of the detection current, improving the overall linearity of the leakage current characteristics and preventing mass deviation in large mass ranges while maintaining manageable system complexity through modular architecture
Solution Approach 2:
Multiple rectifying devices are merged in parallel configuration within the wave-detection unit. This combination allows the system to leverage the collective linear operation range of individual rectifiers, achieving improved linearity and mass detection accuracy across a broader mass-to-charge ratio spectrum
2Measurement precision
If multiple rectifiers are connected in parallel to improve linearity, then the mass deviation is reduced, but the device complexity increases
Solution Approach 1:
The wave-detection unit is divided into multiple independent rectifier modules (first, second, third, fourth rectifiers) that can be individually optimized and replaced. This segmentation improves linearity through parallel operation while managing complexity through standardized modular components
Solution Approach 2:
The system changes the operational parameters by operating multiple rectifiers in parallel rather than a single rectifier. This parameter change (from single to multiple parallel devices) extends the linear operation range and improves mass detection precision while the modular design keeps the implementation complexity manageable
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 prevents mass deviations by improving overall linearity and allowing precise separation of ions across a wide range of mass-to-charge ratios, even with rectifiers having limited linear operation.
Implementation Method 1
a wave-detection unit that has a plurality of rectifiers each of which includes a rectifying device and which are connected in parallel, and detects the AC voltage applied to the mass filter as a wave-detection voltage
Implementation Method 2
an offset of the AC voltage caused by a leakage current of the rectifying device
Data Source
AI summary
A mass spectrometer includes a mass filter, a wave-detection unit, a cancellation circuit and a power supply device. The mass filter selects ions having a mass-to-charge ratio corresponding to an applied AC voltage. The wave-detection unit has a plurality of rectifiers each of which includes a rectifying device and which are connected in parallel, and detects the AC voltage applied to the mass filter as a wave-detection voltage. The cancellation circuit cancels an offset of the AC voltage caused by a leakage current of the rectifying device. The power supply device applies the AC voltage the offset of which has been canceled by the cancellation circuit to the mass filter based on the wave-detection voltage.