Multi-channel PMT Assembly with Grid for Inspection Speed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Single-channel photomultiplier tube (PMT) detectors suffer from diminished speed in semiconductor device inspection, limiting their effectiveness in optical inspection methodologies.
Innovation Solution
A multi-channel PMT detector assembly with parallel dynode channels and a grid system that directs and amplifies photoelectrons, increasing inspection speed by allowing simultaneous or sequential processing of photoelectrons across multiple channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single-channel PMT detector is used, then the device complexity is low, but the inspection speed is diminished
Solution Approach 1:
The photocathode is divided into multiple independent regions (first photocathode region, second photocathode region, etc.), each corresponding to a separate dynode channel. This segmentation allows simultaneous detection in multiple channels, increasing inspection speed while maintaining manageable device complexity through modular architecture
Solution Approach 2:
The invention transitions from a single-channel sequential detection approach to a multi-channel parallel detection approach by adding spatial dimensionality. Multiple dynode channels are arranged in parallel, enabling simultaneous processing of photoelectrons from different photocathode regions, thereby increasing inspection speed without proportionally increasing device complexity
2Productivity
If multiple dynode channels are implemented in parallel, then inspection bandwidth increases, but device complexity increases
Solution Approach 1:
The detector is segmented into multiple independent dynode channels, each with its own photocathode region, dynode pathway, and anode. This modular segmentation enables parallel processing of photoelectrons, increasing inspection bandwidth while keeping each channel's complexity manageable and allowing for systematic scaling
Solution Approach 2:
Each dynode channel is designed with identical functional components (photocathode region, dynode stages, anode), allowing the multi-channel structure to process multiple signals simultaneously using the same detection mechanism. This universality increases productivity without requiring fundamentally different components for each channel, thereby controlling device complexity
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 multi-channel design significantly enhances inspection speed, enabling rapid measurement of adjacent samples or different areas of the same sample, outperforming conventional single-channel PMT detectors by increasing inspection bandwidth.
Implementation Method 1
a photocathode configured to absorb photons, the photocathode further configured to emit photoelectrons
Implementation Method 2
a first set of dynode pathways including a plurality of dynode stages configured to receive a first portion of the photoelectrons and direct a first amplified photoelectron current onto a first anode
Data Source
AI summary
A multi-channel photomultiplier tube (PMT) detector assembly includes a photocathode. The detector assembly includes a first dynode channel including a first set of dynode pathways. The first set of dynode pathways include a plurality of dynode stages configured to receive a first portion of the photoelectrons and direct a first amplified photoelectron current onto a first anode. The detector assembly includes an additional dynode channel including an additional set of dynode pathways. The additional set of dynode pathways includes a plurality of dynode stages configured to receive an additional portion of the photoelectrons and direct an additional amplified photoelectron current onto an additional anode. The detector assembly includes a grid configured to direct the first portion of the photoelectrons to one or more of the first set of pathways and an additional portion of the photoelectrons to one or more of the additional set of pathways.