X-ray Detector Signal Correction Without Source Synchronization
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Solution Overview
Problem
Existing X-ray detector systems face challenges in accurately correcting detector signals without synchronization with the X-ray radiation source, leading to potential baseline shifts and energy scale shifts due to non-ideal detector behavior and leakage currents.
Innovation Solution
An apparatus and method that process X-ray detector signals by generating a correction signal independently of synchronization, using a signal correction unit to sample and validate process values during sampling and validation periods, and update the correction signal only when no pulses are detected, thereby correcting the detector signal to a baseline level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchronization with the X-ray radiation source is used for signal correction, then correction accuracy is improved, but system complexity and synchronization requirements increase
Solution Approach 1:
The patent extracts the synchronization requirement from the signal correction process. By using a sampling pulse that is periodically provided independent of the X-ray source timing, the system can determine baseline shifts without needing to synchronize with the radiation source. This separates the correction function from the source timing control, reducing overall system complexity while maintaining correction accuracy.
Solution Approach 2:
The system uses its own internally generated sampling pulse to trigger correction operations. The sampling pulse is created by the evaluation unit itself, allowing the system to self-synchronize without external timing signals from the X-ray source. This self-service approach eliminates the need for complex external synchronization mechanisms.
2Stability of the object's composition
If continuous monitoring of the process signal is performed, then baseline stability is improved, but processing time and computational load increase
Solution Approach 1:
Instead of continuous monitoring, the system uses periodic sampling triggered by sampling pulses. The evaluation unit samples the process signal at specific intervals determined by the sampling pulse timing. This periodic sampling maintains baseline stability by regularly updating the correction signal while significantly reducing processing time compared to continuous monitoring.
Solution Approach 2:
The sampling pulse is provided in advance of the actual sampling moment, allowing the system to prepare the sampling circuitry and timing sequences before the correction operation is needed. This preliminary action ensures that when sampling occurs, the system is already in the optimal state to accurately capture the baseline level without requiring continuous real-time processing.
3Measurement precision
If the correction signal is updated frequently, then signal accuracy is improved, but the impact of leakage currents and non-ideal detector behavior increases
Solution Approach 1:
The system uses feedback from the process signal to determine when to update the correction signal. By monitoring whether a process signal pulse occurs during the sampling and validation periods, the system can feedback-control the correction signal updates. This ensures that the correction signal is updated only when the baseline is stable and not affected by recent pulses or leakage current variations, maintaining accuracy while minimizing harmful factor impact.
Solution Approach 2:
The validation period following the sampling period acts as a cushioning mechanism. During this validation period, the system checks whether a process signal pulse occurs that would invalidate the sampled baseline level. This beforehand cushioning prevents the system from using inaccurate baseline measurements that could be affected by leakage currents or recent pulses, thereby protecting signal accuracy.
Data Source
AI summary
A detector signal is corrected by superimposing the detector signal with a correction signal. For providing a valid correction signal, a sampling pulse is periodically or randomly provided. The sampling pulse serves as the initiator for sampling a process signal. During the sampling, the process signal is observed. In case a pulse at the process signal is detected, the sampling is assumed as not being suitable to correct the detector signal, since the pulse affects the process signal. Otherwise, the process signal is further observed during a validation period to validate whether the sampled process value of the process signal has already been influenced by an upcoming pulse at the process signal. In case the sampling is assumed as valid, the sampled process value is used as a basis for providing the correction signal.