Flexible Interconnection Unit for PMT Signal Routing
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Solution Overview
Problem
The existing gamma scintillation cameras face reliability and serviceability issues due to heat accumulation and complex interconnections between PMT preamplifiers and acquisition electronics, making it difficult to access and maintain the detectors, and complicating manufacturing processes.
Innovation Solution
A single interconnection unit provides all necessary signal connections, including shielded balanced differential pair RF signals and power supply connections, using a flexible circuit with a two-layer design to connect PMTs to exterior circuitry, allowing electronics to be relocated outside the tub enclosure, thereby reducing heat accumulation and simplifying maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PCBs and cables are used for PMT interconnections inside the tub, then all signal connections can be established, but heat accumulates and reliability deteriorates
Solution Approach 1:
The patent extracts the electronics from inside the tub enclosure and relocates them to the exterior. The interconnection unit serves as a bridge, carrying all necessary signals (power, RF, digital) through the tub wall to connect PMTs inside with electronics outside, thereby eliminating heat generation within the tub while maintaining all required connections.
Solution Approach 2:
The interconnection unit acts as an intermediary component that facilitates the transfer of multiple signal types through the tub enclosure. It provides a structured interface that accommodates power supply voltages, balanced RF signals, and serial data streams, enabling communication between interior PMTs and exterior electronics without direct internal routing.
2Ease of repair
If numerous PCBs and cables are used for PMT interconnections, then all signal connections can be established, but serviceability deteriorates
Solution Approach 1:
The patent segments the interconnection system into modular units. Each interconnection unit is designed to serve a specific group of PMTs and can be independently accessed or replaced. This modular architecture simplifies maintenance by allowing technicians to work on exterior modules without disassembling the entire tub enclosure or other interconnected components.
Solution Approach 2:
By extracting the electronics from the tub interior to the exterior, the patent creates accessible replacement points outside the enclosure. This allows PMTs and their associated electronics to be serviced by simply connecting or disconnecting external interconnection units, eliminating the need to disassemble the tub structure for maintenance.
3Ease of manufacture
If electronics are packaged inside the tub, then all connections can be established, but manufacturing complexity increases
Solution Approach 1:
The patent divides the system into separate manufacturing modules: the tub enclosure with embedded PMTs can be manufactured independently, and the interconnection units with electronics can be assembled separately outside the tub. This segmentation allows each component to be manufactured using optimized processes, then assembled together at the final integration stage, simplifying overall manufacturing.
Solution Approach 2:
The patent extracts the electronics from the tub assembly process entirely. The tub can be manufactured and tested with PMTs installed, then the interconnection units are separately assembled with their electronics and connected to the exterior. This extraction eliminates the complexity of routing and assembling numerous cables and PCBs within the tub enclosure during manufacturing.
4Ease of repair
If a single interconnection unit is used for all PMT connections, then serviceability improves, but connection complexity increases
Solution Approach 1:
The patent merges multiple connection functions into a single integrated interconnection unit. This unit simultaneously handles power supply connections, balanced RF signal transmission, and serial data stream communication for multiple PMTs. By consolidating these functions, the design improves accessibility for maintenance while managing connection complexity through integrated architecture rather than separate discrete connections.
Data Source
AI summary
A single interconnection unit provides all of the signal connections required to operate a group of PMTs and to transmit signals therefrom to acquisition electronics exterior to an enclosure for the PMTs in a nuclear scanner. In a preferred embodiment, the interconnection unit provides a shielded differential pair connection for RF signals; power supply connections for the PMTs, providing all of the voltages required to operate PMTs and the associated circuits, as well as connections for those signals and appropriate ground planes. Preferably, interconnection unit comprises a flex circuit with end connectors designed to connect to a power supply unit and an acquisition unit remote from the PMTs. Connection points are provided along the length of the flexible circuit for connection to a PMT and provide all of the necessary connections for that PMT, including shared power supplies and ground buses, as well as connections dedicated to a particular PMT, including a dedicated RF differential pair, a dedicated digital line, and an associated ground plane.