X-ray Detection Signal Processing Digital Correction
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Solution Overview
Problem
Existing X-ray detection signal processing apparatuses are complex in structure and require extensive adjustments, and digital signal processing methods fail to adequately remove the effects of differential time constants, leading to changes in gain and baseline that affect the accuracy of pulse height analysis.
Innovation Solution
A high-speed analog-to-digital converter and digital signal processing block, including an event detecting unit, memory unit, and event processing unit, are used to convert and process signals from an X-ray detector, employing filtering and correction coefficients to counteract the effects of differential time constants, thereby producing a signal with a high S/N ratio proportional to the energy of incident X-rays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an analog signal processing apparatus is used to remove the influence of differential time constant, then the gain and baseline stability are improved, but the device structure becomes complicated requiring several hundred component parts and complicated adjustment
Solution Approach 1:
The patent replaces the complex analog signal processing apparatus with a digital signal processing system. The analog circuitry that required several hundred components is substituted by digital processing units that perform the same signal conditioning functions through software algorithms, thereby maintaining measurement precision while dramatically reducing structural complexity
Solution Approach 2:
The patent changes the operating parameters by performing signal processing in the digital domain rather than analog domain. By converting the signal to digital form and applying digital filtering and correction algorithms, the system achieves the same gain and baseline stability without the physical complexity of analog components
2Device complexity
If a digital signal processing apparatus is used to simplify structure, then the device complexity is reduced, but the capability to remove the change in final baseline resulting from differential time constant is insufficient
Solution Approach 1:
The patent enhances the simple digital signal processing apparatus by substituting additional digital processing functions. Specific digital filters and correction algorithms are implemented to compensate for the differential time constant effects, thereby maintaining structural simplicity while improving baseline stability capability
Solution Approach 2:
The patent introduces feedback mechanisms in the digital signal processing chain. By continuously monitoring the signal characteristics and applying real-time corrections for differential time constant effects, the system maintains baseline stability without adding analog complexity
3Device complexity
If the signal is converted to digital signal before pulse height analysis, then the structure is simplified, but the gain and baseline tend to change affecting measurement accuracy
Solution Approach 1:
The patent applies preliminary digital signal processing actions before pulse height analysis. By pre-conditioning the digital signal with appropriate filtering and correction algorithms, the system prevents gain and baseline shifts from occurring during subsequent analysis, thereby maintaining both structural simplicity and measurement accuracy
Data Source
AI summary
An X-ray detection signal processing apparatus of the present invention is such that after a signal from a preamplifier has been converted into a digital signal at a high speed by means of a high speed analog-to-digital converter (1), a process for removing influences brought about by a component that has been decayed by a differential time constant in the preamplifier is performed on a digital basis in a digital signal processing block (2). An event detecting unit (3) within the digital signal processing block (2), smoothen the signal from the high speed analog-to-digital converter (1) for a predetermined shaping time with the use of a filter function for high speed shaping, detects as an event information the timing at which the smoothened signal exceeds a predetermined threshold and attains the maximum value, and add such event information to the signal from the high speed analog-to-digital converter (1).