Doppler-Shifted Spectral Detection for Shielded Material Identification
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Solution Overview
Problem
Existing methods for remote detection and characterization of materials behind dense or shielded objects face limitations due to short penetration distances of ionizing radiation, requiring longer measurement times and increased burdens on operations, especially in applications like baggage handling, cargo inspection, and geologic surveys.
Innovation Solution
A method and apparatus that induce controlled temperature perturbations at the sample location during ionizing radiation interrogation, utilizing the Doppler effect to enhance the detection of response emission spectra, allowing for reduced measurement times and improved accuracy in material inventory and composition analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If ionizing radiation is used for remote detection of materials behind dense objects, then penetration capability is improved, but measurement time increases
Solution Approach 1:
The patent applies parameter changes by intentionally varying the temperature of the sample material. This temperature variation induces Doppler shifts in the response emission energy spectra, which provides additional information about the material composition and reduces the required measurement time. The temperature is changed as a controlled parameter to enhance the detection signal.
Solution Approach 2:
The patent uses thermal vibration (heating) of the sample material to induce Doppler broadening and shifting of the response emission spectra. By controlling the temperature variation, the system enhances the spectral features that carry material identification information, thereby reducing the counting time needed for accurate detection.
2Measurement precision
If longer measurement duration is used to compensate for short penetration distance, then detection accuracy is improved, but operational efficiency deteriorates
Solution Approach 1:
The patent changes the temperature parameter of the sample to induce Doppler effects in the response emission spectra. This provides additional spectral information that improves material identification accuracy while reducing the required measurement duration, thereby maintaining both detection precision and operational efficiency.
Solution Approach 2:
The patent implements continuous temperature modulation of the sample during the measurement process. This continuous thermal perturbation ensures that Doppler-shifted spectral information is continuously available, allowing for accurate material identification in reduced time compared to static, isothermal measurements.
3Loss of time
If controlled temperature perturbation is applied to induce Doppler effect, then measurement time is reduced, but device complexity increases
Solution Approach 1:
The patent controls the temperature of the sample material as a variable parameter to induce Doppler shifts in the response emission spectra. By systematically varying this parameter and measuring the corresponding spectral changes, the system achieves accurate material identification in reduced time. The temperature control adds some complexity but enables the time reduction benefit.
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 method enables more accurate and efficient detection of materials like Cesium, Iodine, Neptunium, Plutonium, and Uranium by reducing counting time and exposure duration, while maintaining accuracy through spectral shifts, applicable to various high-energy photon-emitting materials.
Implementation Method 1
The present invention describes a method and apparatus that manifests a controlled temperature perturbation to the sample location concurrently with sample interrogation by ionizing radiation and with detection of the response emission energy spectra. This configuration induces and detects Doppler effects manifested at the sample location
Data Source
AI summary
A method and apparatus for the remote, non-invasive detection or characterization of materials manifests a controlled temperature perturbation to the sample material location concurrently with sample interrogation by ionizing radiation and with detection of the response emission energy spectra. This configuration induces and detects Doppler effects manifested at the sample location, allowing material inventory and composition measurements, and allowing a comparative reduction of the exposure duration compared to other isothermal proportional count, coincidence count or spectral analysis techniques. The method and apparatus apply primarily to the detection of elements and isotopes in baggage handling, cargo inspection, chemical characterization, process control and geologic operations, though the method and apparatus are not restricted to these applications. Though the magnitudes of the measured effects are substance specific, the contributing physical processes are not strictly material dependent, allowing method and apparatus applications to almost any high-energy photon-emitting material in multiple applications.