X-ray Detector Heating Member Mitigates Photoconductor Polarization
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Solution Overview
Problem
Repeated X-ray imaging can cause polarization in photoconductors to persist and become fixed, leading to a decrease in X-ray detection sensitivity.
Innovation Solution
An X-ray detector is designed with a sensor panel containing a photoconductor layer, which may include a ferroelectric material like perovskite, and a heating member located behind the sensor panel. The heating member heats the photoconductor layer to mitigate polarization and maintain sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If repeated X-ray imaging is performed using a photoconductor, then X-ray detection is achieved, but polarization accumulates and becomes fixed causing sensitivity decrease
Solution Approach 1:
The patent applies parameter changes by heating the photoconductor layer to a specific temperature range (20-80°C) to alter its physical state temporarily. This thermal parameter change mitigates accumulated polarization by facilitating charge carrier recombination and reducing trap occupancy, thereby restoring detection sensitivity without changing the photoconductor material itself
Solution Approach 2:
The heating member operates periodically between imaging cycles rather than continuously. During standby periods between X-ray exposures, the heating member activates to reduce polarization accumulation, then stops during actual imaging to avoid interference. This periodic action maintains sensitivity while enabling repeated imaging operations
2Reliability
If a heating member is added to mitigate polarization, then sensitivity is maintained, but device complexity increases
Solution Approach 1:
The heating member is merged with the existing detector structure by positioning it on the rear surface of the sensor panel, sharing the same housing and control circuitry. This integration approach adds the heating function without requiring a separate independent system, thereby minimizing the increase in device complexity while achieving polarization mitigation
3Reliability
If heating is applied to reduce polarization, then sensitivity is maintained, but energy consumption increases
Solution Approach 1:
The heating member operates periodically between imaging cycles rather than continuously. During standby periods between X-ray exposures, the heating member activates to reduce polarization accumulation, then stops during actual imaging to avoid interference. This periodic action maintains sensitivity while enabling repeated imaging operations
Solution Approach 2:
The heating is applied at moderate temperatures (20-80°C) rather than extreme temperatures, providing just enough thermal energy to mitigate polarization without excessive energy input. This partial action approach achieves the necessary sensitivity restoration with minimized power consumption
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 heating member effectively reduces polarization in the photoconductor layer, preventing sensitivity loss and also helps in removing moisture, thus preventing defects caused by it.
Implementation Method 1
a heating member located behind the sensor panel... the heating member may perform a heating operation during at least part of the standby section... A heating temperature of the heating member may be 20 to 80 degrees
Implementation Method 2
the photoconductor layer may contain a ferroelectric material... repeated X-ray imaging may cause polarization in the photoconductor to persist for a long time and become fixed
Data Source
AI summary
Proposed is an X-ray detector including a sensor panel configured to include first and second electrodes on a substrate, and a photoconductor layer between the first electrode and the second electrode, and a heating member located behind the sensor panel, wherein the photoconductor layer contains a ferroelectric material.