Uncooled Radiation Shield for Thermal Imaging Noise Reduction
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Solution Overview
Problem
Conventional thermal imaging systems face challenges in accurately measuring infrared radiation due to thermal radiation noise from camera system components, which can lead to image distortion and require energy-intensive active temperature stabilization, complicating design and increasing energy consumption.
Innovation Solution
An uncooled radiation shield with a reflective outer surface and emissive inner surface is designed to reflect thermal radiation noise, maintaining a constant temperature and emitting uniform radiation, allowing for precise calibration and compensation of its emissions, thereby improving radiometric accuracy without the need for active cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If active temperature stabilization is used to maintain constant radiation from camera components, then radiation noise is reduced, but energy consumption increases and device complexity increases
Solution Approach 1:
The patent extracts and isolates the radiation-emitting components (lens, shutter, aperture stop) into a separate radiation shield assembly that is thermally decoupled from the detector. This allows the shield to emit constant radiation without requiring active temperature stabilization, while the detector remains isolated from temperature fluctuations and radiation noise.
Solution Approach 2:
The system is segmented into two thermally independent zones: a radiation shield containing temperature-varying components (lens, shutter, aperture) and a detector zone maintained at stable temperature. The radiation shield is thermally isolated using low-conductivity supports, creating separate thermal pathways that prevent heat transfer from the shield to the detector.
2Measurement precision
If active temperature stabilization is implemented to prevent image distortion, then image quality is maintained, but device complexity and design requirements increase
Solution Approach 1:
The patent extracts the temperature-stable components (detector and its immediate housing) from the temperature-varying radiation shield assembly. This spatial and thermal separation eliminates the need for complex active temperature stabilization systems, as the detector is naturally protected from thermal fluctuations by the thermally isolated shield structure.
Solution Approach 2:
The radiation shield acts as an intermediary structure between the temperature-varying optical components and the temperature-sensitive detector. It provides a stable radiative environment for the detector while allowing the optical components to operate at ambient temperature, eliminating the need for complex thermal control mechanisms.
3Stability of the object's composition
If the shield is thermally coupled to the detector through the window, then the shield temperature tracks detector temperature, but thermal radiation noise may reach the detector
Solution Approach 1:
The radiation shield has different surface properties on its inner and outer surfaces. The inner surface facing the detector is designed with high emissivity to emit constant, predictable radiation, while the outer surface has low emissivity to minimize absorption of ambient thermal radiation. This local differentiation of surface properties optimizes both thermal coupling and radiation noise reduction.
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 uncooled radiation shield effectively limits thermal radiation noise, enabling accurate thermal scene measurement and reducing energy consumption by eliminating the need for active temperature stabilization, while maintaining reliable calibration and image processing adjustments.
Implementation Method 1
The shield is designed to emit substantially constant radiation. The shield also substantially blocks radiation emitted by a camera housing that at least partially surrounds the shield.
Implementation Method 2
a window that is thermally coupled to the detector and a shield, so that the window is in between the detector and the shield and thermally conductive pathways exist between the detector and the shield
Implementation Method 3
a detector that measures radiation
Data Source
AI summary
An apparatus includes a detector that measures radiation. The apparatus also includes a window that is relationally coupled to the detector and a shield, so that the window is in between the detector and the shield. The apparatus further includes the shield that emits substantially constant radiation, and substantially blocks radiation from a camera housing at least partially surrounding the shield, so that the detector measures radiation passing through an optical system and the shield.