Parallel Count Processing Units for Photon Detection
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Solution Overview
Problem
Conventional photoelectric conversion devices lack effective exposure control, particularly in synchronizing with the occurrence pattern of incident photons, which affects the accuracy of photon counting.
Innovation Solution
A photoelectric conversion device with a signal processing unit that includes multiple count processing units arranged in parallel, where each unit has a distinct active and inactive period, allowing for overlapping active periods to enhance exposure control and photon counting accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single count processing unit is used, then the device complexity is low, but the exposure control functionality is insufficient and cannot accurately count photons in varying light conditions
Solution Approach 1:
The signal processing unit is divided into multiple count processing units (first, second, and third units) that operate in parallel with different active periods. This segmentation allows each unit to specialize in counting photons during specific time windows, enabling accurate measurement across varying light conditions without requiring a single complex unit to handle all scenarios simultaneously.
Solution Approach 2:
The count processing units are configured with dynamic active periods that change over time. The first unit is active during a first period, the second unit during a second period, and the third unit during a third period that overlaps with portions of the first and second periods. This dynamic temporal division allows the system to adapt to different photon flux conditions by activating the appropriate counting unit for each time window.
2Measurement precision
If multiple count processing units with different active periods are used, then the photon counting accuracy is improved, but the device complexity increases
Solution Approach 1:
The count processing units operate in periodic cycles with defined active and inactive periods. Each unit is activated during its specific period to count photons, then deactivated to allow other units to operate. This periodic operation pattern enables precise photon counting by ensuring that at least one unit is actively counting during any given time, while the periodic nature simplifies the control logic compared to continuous operation of a single complex unit.
Solution Approach 2:
The system pre-configures the active periods of each count processing unit based on expected photon arrival patterns. By planning and assigning specific time windows to each unit in advance, the system optimizes photon capture efficiency without requiring real-time complex decision-making, thereby improving measurement precision while keeping the control mechanism relatively simple.
3Adaptability or versatility
If overlapping active periods are used in count processing units, then the exposure control adaptability is enhanced, but the control complexity increases
Solution Approach 1:
The system introduces a temporal dimension to the operation of count processing units by assigning them different active periods in time. The third count processing unit's active period overlaps with portions of the first and second units' active periods, creating a multi-layered temporal structure. This dimensional approach to time management allows the system to handle varying light conditions effectively while maintaining relatively simple control logic, as the overlapping periods are pre-defined rather than dynamically adjusted.
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 enables high functionality in exposure control, allowing for accurate photon counting and improved imaging capabilities, especially in varying light conditions, by ensuring appropriate exposure times for both low-brightness and high-brightness regions.
Implementation Method 1
A single photon avalanche diode (SPAD: Single Photon Avalanche Diode) is known as a detector capable of detecting weak light at a single photon level. SPAD amplifies signal charge excited by photon by several times to several million times by using an avalanche multiplication phenomenon generated by a strong electric field induced in a p-n junction of a semiconductor.
Implementation Method 2
SPAD amplifies signal charge excited by photon by several times to several million times by using an avalanche multiplication phenomenon generated by a strong electric field induced in a p-n junction of a semiconductor.
Data Source
AI summary
The disclosed photoelectric conversion device includes a photoelectric conversion unit outputting a pulse signal in response to an incident of photon, a signal processing unit that is connected to the photoelectric conversion unit and counts the pulse signal, and a control unit that controls the signal processing unit. The signal processing unit includes a first count processing unit and a second count processing unit arranged in parallel. The control unit is configured to set an active period and an inactive period for each of the first count processing unit and the second count processing unit. A period during which the first count processing unit is active includes a first period during which the second count processing unit is active and a second period during which the second count processing unit is inactive.