Pole-Zero Adjustment Using Multiple-Pe Pulse Synthesis
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Solution Overview
Problem
Existing automatic Pole-Zero compensation methods in radiation measurement systems are limited by DC baseline offset errors, which affect the accuracy of determining proper compensation states, leading to spectral distortion and counting rate issues.
Innovation Solution
A method using a multiple-peak pulse shape synthesis and amplitude measurements to adjust the Pole-Zero compensation, where a fast ADC digitizes signals, and a multiple-peak digital shaper produces pulses with predictable peak amplitudes, allowing for accurate adjustment of the digital attenuator to eliminate baseline offset effects and achieve precise compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustment methods are used for Pole-Zero compensation, then the system can be adjusted, but the adjustment accuracy is limited by DC baseline offset errors
Solution Approach 1:
The patent replaces manual mechanical adjustment mechanisms with an automated digital system. A microprocessor-based controller automatically adjusts the Pole-Zero compensation by digitally controlling a variable resistor or capacitor, eliminating the need for manual trimming potentiometers and reducing human error in the adjustment process.
Solution Approach 2:
The system implements self-adjustment capability where the microprocessor automatically monitors the pulse shape and autonomously modifies the Pole-Zero compensation parameters. The system uses feedback from the shaped pulse characteristics to self-correct baseline offset errors without requiring external manual intervention, thereby improving measurement precision while maintaining operational simplicity.
2Productivity
If automatic Pole-Zero compensation is implemented, then adjustment speed improves, but DC baseline offset errors affect determination accuracy
Solution Approach 1:
The patent extracts and eliminates the harmful DC baseline offset component from the pulse signal before analysis. By removing the DC offset through coupling capacitors or high-pass filtering stages, the automatic compensation system can accurately analyze the AC components of the pulse shape without being influenced by baseline shifts, thereby maintaining both fast adjustment speed and high determination accuracy.
Solution Approach 2:
The microprocessor acts as an intelligent intermediary between the pulse shaping circuitry and the Pole-Zero adjustment mechanism. It processes the shaped pulses, determines compensation needs based on pulse characteristics, and automatically adjusts the compensation network, thereby achieving both rapid automatic adjustment and accurate compensation state determination despite the presence of DC baseline offsets.
3Duration of action of moving object
If CR differentiator is used to shorten pulse decay time, then the pulse width decreases, but spectral distortion increases due to undershoot
Solution Approach 1:
The patent applies Pole-Zero compensation that introduces a compensating exponential tail with opposite polarity to counterbalance the undershoot generated by the CR differentiator. By carefully selecting the time constants of the compensation network, the harmful undershoot is canceled out, eliminating spectral distortion while preserving the shortened pulse width achieved by the differentiator.
Solution Approach 2:
The system merges the CR differentiator stage with the Pole-Zero compensation network into an integrated pulse shaping circuit. The output of the differentiator is combined with the compensated exponential tail through summing amplifiers or resistive networks, producing a final shaped pulse that benefits from both the rapid decay of the differentiator and the distortion correction of the compensation network.
Data Source
AI summary
A method for automatic Pole-Zero adjustment in a radiation measurement system, the method including steps of: receiving a plurality of pulses from a radiation detector; for each of the plurality of pulses, synthesizing a multiple-peak pulse shape; and using the amplitude measurement of individual peaks in each of the multiple-peak pulse shapes to adjust the pole-zero of the radiation measurement system.