Scintillator Device Vibration Isolation Wave Spring
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Solution Overview
Problem
Scintillator detectors in harsh industrial environments, such as drilling, experience false count rates due to vibration-induced signals, which complicate low-level radiation detection and reduce the accuracy of measurements.
Innovation Solution
A ruggedized scintillator device design incorporating a scintillator crystal with a single-turn, round-section wire wave spring biasing member that applies a high spring rate of at least 3000 lb/in and a load ratio of at least 0.7, along with a shock absorbing member and a reflector, to stabilize the crystal and reduce vibration-induced counts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the scintillator detector is made ruggedized to withstand high shock and temperature conditions, then the device can operate in harsh industrial environments, but the detector reports higher than actual count rates due to vibration-induced false counts
Solution Approach 1:
A biasing member in the form of a spring is positioned between the scintillator crystal and the photomultiplier tube to apply a pre-compressive force that cushions the crystal against vibration-induced displacement. This prior cushioning prevents the crystal from moving during vibration, thereby eliminating false counts while maintaining the ruggedized housing's ability to withstand shock and temperature.
2Measurement precision
If the scintillator crystal is firmly mounted to reduce vibration sensitivity, then false counts are reduced, but the device complexity increases
Solution Approach 1:
The biasing member is integrated into the existing housing structure, merging the shock absorption function with the crystal mounting structure. The spring is positioned within the housing to directly contact both the crystal and the photomultiplier tube, combining multiple functions (mechanical support, vibration isolation, and electrical isolation) into a single component arrangement, thereby reducing overall device complexity.
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 reduces vibration-induced false counts, enhances the accuracy and precision of radiation detection, and maintains performance in high shock and temperature conditions, extending the device's operational lifetime.
Implementation Method 1
scintillator crystals made of an activated sodium iodide material that is effective for detecting gamma rays... the scintillator crystals are enclosed in tubes or casings, which include a window permitting radiation induced scintillation light to pass out of the crystal package for measurement by a light-sensing device
Implementation Method 2
The photomultiplier tube converts the light photons emitted from the crystal into electrical pulses
Implementation Method 3
a biasing member disposed proximal to the backplate and applying a biasing force to the backplate. In turn, the backplate applies a biasing force to the scintillator crystal in a direction toward the front face. The biasing member comprises a single-turn, round-section wire wave spring
Data Source
AI summary
A detector includes a scintillator crystal having a front face and a rear face, a backplate disposed proximal to the rear face of the scintillator crystal, and a biasing member disposed proximal to the backplate and applying a biasing force to the backplate. In turn, the backplate applies a biasing force to the scintillator crystal in a direction toward the front face. The biasing member comprises a single-turn, round-section wire wave spring.