Gas Detector High-Voltage Feedback for Stable Signal Amplitude
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Solution Overview
Problem
Gas ionization particle detectors face significant challenges in stabilizing signal amplitudes due to environmental and gas composition variations, particularly in outdoor applications like muon imaging, where existing feedback systems are insufficient in correcting for these changes.
Innovation Solution
A feedback device and method that directly adjusts the high voltage setpoints based on characteristic indicators of the measurement signals from the detector, such as average amplitudes or times, to maintain optimal detection efficiency and minimize noise, using a voltage regulator that accumulates signal data over time to correct for variations in environmental and gas-related parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If environmental parameters (temperature, pressure, humidity) are measured and high-voltage feedback is implemented based on these measurements, then detector gain stability is partially improved, but amplitude variations persist due to complex relationships between gain and environmental parameters
Solution Approach 1:
The patent implements a feedback system that directly measures the detector's actual gain through test pulses and uses this measurement to adjust the high voltage. This closed-loop feedback approach directly addresses the gap between desired and actual gain, overcoming the limitations of open-loop environmental parameter-based feedback.
Solution Approach 2:
The system uses the detector itself to generate test pulses and measure its own response, enabling self-diagnosis and self-correction of gain variations. This self-service approach eliminates the need for external reference sources and provides direct feedback on actual detector performance.
2Quantity of substance
If gas flow rate is reduced to zero for closed-circuit operation, then gas consumption is minimized, but gas composition changes cause amplitude variations
Solution Approach 1:
The real-time gain measurement and feedback system continuously monitors and corrects amplitude variations caused by gas composition changes, enabling stable operation even in closed-circuit mode with zero gas flow.
3Adaptability or versatility
If outdoor applications are used for muon imaging, then accessibility to structures is improved, but environmental variations significantly alter detector performance
Solution Approach 1:
The automated feedback system continuously compensates for outdoor environmental variations by adjusting the high voltage based on actual detector response measurements, maintaining stable performance despite temperature, pressure, and humidity changes.
Solution Approach 2:
The system dynamically adjusts the high voltage parameter in response to measured gain variations, counteracting the effects of environmental parameter changes and maintaining optimal detector performance in outdoor conditions.
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 solution effectively stabilizes the detector's performance by directly addressing signal amplitude variations, improving stability, efficiency, and reducing noise, even under extreme environmental conditions, thereby enhancing the detector's spatial and temporal resolutions.
Implementation Method 1
By applying a second electric field between this microgrid and readout tracks 3 (and therefore a second high voltage V2 either on the microgrid or on the tracks, the other electrode generally being connected to ground), the electrons pass through the microgrid and multiply (avalanche phenomenon), thus inducing a significant signal on the tracks connected to readout electronics.
Implementation Method 2
a voltage regulator 11 configured to calculate a characteristic indicator of the measurement signal SM delivered by the electronic reading unit 22 and to modify a voltage setpoint delivered to the high voltage generator 21 as a function of the characteristic indicator of the measurement signal
Data Source
Figure 1~2
AI summary
The invention relates to a feedback device (10) for a gas ionization particle detector comprising a high-voltage generator (21) capable of creating a potential difference between electrodes placed in a gas chamber (20). The feedback device includes a voltage regulator (11) configured to calculate a characteristic indicator of a measurement signal delivered by an electronic readout unit (22) capable of collecting an electrical signal induced by a particle passing through the chamber, and to modify a voltage setpoint delivered to the high-voltage generator (21) according to the characteristic indicator of the measurement signal. The characteristic indicator may be an average amplitude. The feedback may utilize an error signal corresponding to the difference between the calculated characteristic indicator and a predetermined value.