Bare Optical Fiber Radiation Detector with Index-Matched Coupling
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Solution Overview
Problem
Conventional radiation detection systems suffer from high photon transmission loss and non-uniform light collection efficiency due to S-shaped bends in optical fibers, leading to a low signal-to-noise ratio, which complicates the accurate detection of neutrons and gamma radiation.
Innovation Solution
The use of optical fibers without cladding, with an optical coupling material having a refractive index less than the core, and a fluid with a lower refractive index, such as air or an aerogel, between the fibers to reduce photon loss and enhance light collection uniformity, thereby improving the signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional optical fibers with cladding are used in radiation detection systems, then the structural integrity and protection of the fiber is improved, but photon transmission loss increases and light collection uniformity deteriorates due to S-shaped bends
Solution Approach 1:
The patent removes the cladding layer from optical fibers used in radiation detection systems, extracting this protective component to eliminate the refractive index mismatch that causes total internal reflection and photon loss at bend locations. This extraction resolves the contradiction by sacrificing structural protection (handled by alternative means) to dramatically reduce photon transmission loss.
Solution Approach 2:
The patent introduces an optical coupling material with refractive index matched to the fiber core as an intermediary between the fiber core and the surrounding environment. This mediator eliminates the abrupt refractive index change at the cladding-fiber interface, preventing total internal reflection and enabling efficient photon transmission even through S-shaped bends.
2Strength
If conventional optical fibers with cladding are used, then fiber protection is improved, but light collection efficiency uniformity worsens
Solution Approach 1:
By removing the cladding layer, the patent eliminates the refractive index boundary that causes non-uniform light collection at bend locations. This extraction ensures that photons are collected uniformly across all fiber segments regardless of their spatial orientation or bend configuration, directly improving measurement precision.
Solution Approach 2:
The patent changes the refractive index parameter of the optical system by eliminating the cladding's higher refractive index and replacing it with an optical coupling material having matched refractive index. This parameter change ensures consistent light collection efficiency across all fibers independent of their position or bend geometry.
3Adaptability or versatility
If S-shaped bends are introduced in optical fibers, then spatial flexibility and adaptability are improved, but signal-to-noise ratio deteriorates due to increased photon loss
Solution Approach 1:
By extracting the cladding layer that causes total internal reflection at bends, the patent enables S-shaped fiber configurations to maintain high photon transmission efficiency. This allows the system to achieve both spatial flexibility for complex detector geometries and high signal-to-noise ratio through reduced photon loss.
Solution Approach 2:
The optical coupling material acts as an intermediary that prevents photon loss at bend locations, enabling the fiber to be configured in S-shaped patterns for spatial adaptability while maintaining high signal-to-noise ratio through efficient photon transmission.
4Loss of energy
If cladding is removed from optical fibers, then photon transmission loss is reduced, but fiber structural protection deteriorates
Solution Approach 1:
The optical coupling material serves as a protective intermediary that replaces the mechanical protection function of the cladding while maintaining the optical benefit of reduced photon loss. This mediator provides both structural support and refractive index matching to prevent total internal reflection.
Solution Approach 2:
The optical coupling material performs multiple functions simultaneously: it provides mechanical protection to the bare fiber core, maintains structural integrity, and optically matches the refractive index to prevent photon loss through total internal reflection at the fiber boundary.
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 configuration significantly reduces photon transmission loss through S-shaped bends, enhances light collection efficiency, and increases the signal-to-noise ratio, allowing for more accurate discrimination between neutrons and gamma radiation.
Implementation Method 1
a scintillating material to produce a light in response to receiving a target radiation
Implementation Method 2
an optical coupling material having a refractive index less than the core, and a fluid with a lower refractive index, such as air or an aerogel, between the fibers to reduce photon loss
Data Source
AI summary
A radiation detection system can include optical fibers and a material disposed between the optical fibers. In an embodiment, the material can include a fluid, such as a gas, a liquid, or a non-Newtonian fluid. In another embodiment, the material can include an optical coupling material. In a particular embodiment, the optical coupling material can include a silicone rubber. In still another embodiment, the optical coupling material has a refractive index less than 1.50. In still another embodiment, the radiation detection system can have a greater signal:noise ratio, a light collection efficiency, or both as compared to a conventional radiation detection system. Corresponding methods of use are disclosed that can provide better discrimination between neutrons and gamma radiation.