Protective Window Out of Focus for Infrared Sensor
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Solution Overview
Problem
Infrared imaging devices are prone to image artifacts and degradation due to environmental debris and damage, which affects the optical surface and subsequently the quality of thermal image data, especially when the sensor window is exposed to environmental factors.
Innovation Solution
A protective window is positioned at a distance greater than the sensor window from the focal plane array, ensuring that any damage or debris incident on it remains out of focus in the thermal image data, thereby preventing image artifacts and maintaining the integrity of the sensor window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor window is placed close to the sensor array for optimal focus, then image quality is improved, but the sensor window becomes vulnerable to environmental damage and debris
Solution Approach 1:
A protective window is introduced as an intermediary element between the sensor window and the external environment. This protective window is positioned at a distance from the sensor array such that it falls outside the depth of field, making it appear out of focus in captured images. Consequently, any debris or damage on the protective window does not degrade image quality, while the sensor window remains close to the sensor array for optimal focus and image quality.
2Adaptability or versatility
If the sensor window is exposed to the environment for device flexibility, then device adaptability is improved, but image artifacts increase due to debris and damage
Solution Approach 1:
The protective window converts the potential harm of environmental exposure into a beneficial solution. By placing the protective window outside the depth of field, any debris or damage that accumulates on it actually serves to protect the sensor window while remaining invisible in the captured images. This allows the device to be exposed to various environments without generating image artifacts from window contamination.
3Reliability
If a protective window is added to protect the sensor window, then reliability is improved, but device complexity increases
Solution Approach 1:
The protective window acts as a sacrificial, replaceable component that protects the more valuable and sensitive sensor window. The protective window can be easily replaced if damaged, while the sensor window remains intact. This approach improves reliability by providing robust protection while minimizing the impact on device complexity, as the protective window is a simple additive component.
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 or eliminates image artifacts caused by environmental damage, ensuring the quality of thermal image data and extending the lifespan of the infrared imaging device by protecting the sensor window from debris and damage.
Implementation Method 1
a protective window displaced at a second distance from the focal plane array, where the second distance is larger than the first distance and causes the surface of the protective window to be substantially or completely out of focus to the focal plane array
Data Source
AI summary
Various embodiments of the present disclosure may include a focal plane array configured to capture thermal image data from a scene. The embodiments may further include a sensor window displaced a first distance from the focal plane array. The embodiments may also include a protective window displaced a second distance greater than the first distance from the focal plane array, wherein the second distance causes damage or debris incident on the protective window to be out of focus in the thermal image data.