Radiation Detector Leakage Current Suppression
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Solution Overview
Problem
Conventional radiation measurement devices face challenges in accurately measuring extremely small and wide-range detection current signals due to increased leakage current when a test function is added, and variations in the insulated state of the interface between the input switching unit and the test-current generation unit, leading to measurement inaccuracies near the lower limit of the range.
Innovation Solution
A radiation measurement device with a test-current generation unit that superimposes a test current signal on the detection current signal in test mode and diverts it to zero voltage in normal mode, using signal conversion and processing units to maintain insulation and prevent leakage current intrusion, allowing for stable and accurate measurements across the entire range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a test function is added to the radiation measurement device, then the ability to confirm system integrity is improved, but the leakage current increases
Solution Approach 1:
The patent extracts the test current input path from the main detection signal path by providing a separate input terminal for test current on the signal input line. This allows the test function to be implemented without the test current path interfering with or adding leakage to the detection current path, thus maintaining measurement accuracy while enabling system integrity verification.
2Adaptability or versatility
If the insulated state of the interface portion changes due to environmental conditions, then the device adaptability is improved, but the leakage current varies
Solution Approach 1:
The patent introduces a switching unit as an intermediary component between the test-current generation unit and the signal input line. This switching unit controls the connection state, ensuring that the test current path is properly isolated from the detection current path. By using this intermediary switching mechanism, the device can adapt to different operational modes (normal measurement vs. test mode) while maintaining stable leakage current characteristics through proper insulation control.
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
This solution enables stable and accurate measurement of detection current signals near the lower limit by preventing leakage current intrusion, ensuring high accuracy and integrity of radiation monitoring without increasing leakage current, even in the presence of environmental changes or test function activation.
Implementation Method 1
an ionization chamber as a radiation detector, and to accurately measure a detection current signal which is generated by the action of radiation in the ionization chamber
Data Source
AI summary
A radiation measurement device having a radiation detector, a measurement instrument provided with a signal conversion unit for carrying out signal conversion on a detection current signal output from the radiation detector, and a signal input line for supplying the detection current signal output from the radiation detector to the signal conversion unit, wherein if a test mode is selected, a test current signal is superposed on the detection current signal and supplied to the signal conversion unit through the closing of contacts and the connection of a constant-voltage source and the signal input line, and if a normal mode is selected, the constant-voltage source is connected to a point having the same potential as the signal input line and the generation of a potential difference between the contacts is prevented through the opening of the contacts and the disconnection of the constant-voltage source and signal input line.