Compact Phototube Design for High-Sensitivity Photon Detection
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Solution Overview
Problem
Conventional photomultiplier tubes (PMTs) are large, heavy, and difficult to produce due to their complex structure with multiple dynodes, which hinders their application in compact and efficient light detection systems.
Innovation Solution
A compact phototube design featuring an electron ejector, detector, and electrode configuration within a cylindrical hole with metal walls and through-silicon via (TSV) connections, allowing for efficient electron collection and amplification without the need for multiple dynodes, and incorporating peripheral circuitry for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional photomultiplier tubes use successive dynodes for electron multiplication, then the sensitivity and detection capability are improved, but the device size, weight, and manufacturing complexity increase significantly
Solution Approach 1:
The patent extracts and eliminates the complex successive dynodes structure from the photomultiplier tube, replacing it with a simplified single-stage electron multiplication approach using a photodiode and signal amplification circuitry, thereby reducing structural complexity while maintaining detection capability
Solution Approach 2:
The patent replaces the mechanical/electrical dynode chain structure with an electronic signal amplification system using photodiodes and amplification circuits, substituting a complex physical electron multiplication pathway with an electronic signal processing approach
2Measurement precision
If conventional photomultiplier tubes use successive dynodes for electron multiplication, then the sensitivity and detection capability are improved, but the device weight increases
Solution Approach 1:
The patent removes the heavy successive dynodes structure from the device, replacing it with a lighter photodiode-based detection system that achieves comparable sensitivity without the weight penalty of multiple dynode stages
3Measurement precision
If conventional photomultiplier tubes use successive dynodes for electron multiplication, then the sensitivity and detection capability are improved, but the manufacturing difficulty increases
Solution Approach 1:
The patent extracts and eliminates the difficult-to-manufacture successive dynodes assembly, replacing it with a photodiode and circuit board configuration that is more amenable to standard manufacturing processes and assembly techniques
Solution Approach 2:
The patent replaces the mechanically complex dynode structure with an electronic circuit implementation using photodiodes and amplification circuits, which can be manufactured using standard semiconductor and PCB fabrication processes
4Power
If conventional photomultiplier tubes use successive dynodes for electron multiplication, then the electron multiplication capability is improved, but the device volume increases
Solution Approach 1:
The patent removes the bulky successive dynodes structure that occupies significant volume, replacing it with a compact photodiode-based detection system that achieves comparable electron multiplication and signal amplification in a much smaller footprint
Solution Approach 2:
The patent transitions from a three-dimensional dynode chain structure to a planar photodiode and circuit configuration, reducing the device from a voluminous assembly to a flattened, two-dimensional layout that minimizes overall device volume
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 design enables efficient detection of low-intensity photons, reducing the size and production complexity of phototubes while maintaining high sensitivity, suitable for applications in night vision devices and medical imaging.
Implementation Method 1
Light entering the tube and incident on the photocathode causes electrons to be emitted by the photocathode, as a consequence of the photoelectric effect
Implementation Method 2
an electrode configured for applying a voltage to drive the electrons to the detector
Data Source
AI summary
A phototube suitable for detecting a photon, comprising: an electron ejector configured for emitting electrons in response to an incident photon; a detector configured for collecting the electrons and providing an output signal representative of the incident photon; an electrode configured for applying a voltage to drive the electrons to the detector; and one or more sidewalls forming an envelope of a hole between the electrode and the detector, wherein the electron ejector is inside the hole and bonded to the electrode.