Radiation Detector Static Protection Low Input Capacitance
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Solution Overview
Problem
Conventional radiation detectors face issues with increased noise and deteriorated energy resolution due to high input capacitance from radiation detecting elements to preamplifiers, which can be damaged by static electricity, leading to breakdowns.
Innovation Solution
A radiation detector design that incorporates a circuit element with capacitance, such as capacitors, diodes, or varistors, connected between connecting wires to suppress static electricity, while keeping the input capacitance of the preamplifier low, and is housed in a sealed environment to protect the detecting element and amplifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circuit element for countermeasure against static electricity is provided at a signal wire for inputting a signal from a radiation detecting element into a preamplifier, then static electricity protection is improved, but input capacitance of the preamplifier is increased
Solution Approach 1:
A capacitor is introduced as an intermediary element connected between the signal wire and ground line. This capacitor acts as a mediator that provides static electricity protection by diverting static charges to ground while being designed with sufficiently small capacitance (e.g., 1pF or less) to minimize its impact on the preamplifier's input capacitance and maintain measurement precision
Solution Approach 2:
The capacitor is selectively placed only at critical locations where static electricity protection is most needed (such as between the signal wire and ground line near the preamplifier input), rather than adding protection elements throughout the entire signal path. This localized approach provides effective protection while minimizing the total added capacitance
2Measurement precision
If input capacitance of preamplifier is lowered to enhance energy resolution, then measurement precision is improved, but susceptibility to static electricity damage increases
Solution Approach 1:
The capacitor is positioned to provide preliminary protection against static electricity before it can reach and damage the preamplifier. By connecting the capacitor between the signal wire and ground line at the input stage, static charges are diverted to ground in advance, protecting the low-capacitance preamplifier from static electricity damage while maintaining its low input capacitance for high energy resolution
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 protects the radiation detector from static electricity damage while maintaining low input capacitance, enhancing energy resolution and resistance to static interference.
Implementation Method 1
a circuit element, which is connected between at least one of the plurality of connecting wires and another connecting wire and has capacitance
Data Source
AI summary
In the radiation detector, a capacitor is connected between a connecting wire which is connected with a preamplifier (amplifier) and another connecting wire. Specifically, the capacitor is connected between the connecting wire and another connecting wire which has the lowest electric resistance with respect to a signal wire among connecting wires connected with a radiation detecting element. This prevents electric current produced by static electricity from flowing to the signal wire and prevents the signal wire or the preamplifier from being damaged by static electricity. A circuit element for a countermeasure against static electricity is not provided at the signal wire, and therefore input capacitance of the preamplifier is kept low. Accordingly, the radiation detector is improved by a sufficient countermeasure against static electricity while input capacitance of the preamplifier is kept low.