Infrared Sensor Off-Axis Aberration Reduction
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Solution Overview
Problem
Infrared sensors face degradation in detection precision due to off-axis aberration when detecting infrared light from off-axis object points.
Innovation Solution
An infrared sensor design that includes a lens, a member with an opening, and a spacer creating a gap between the member and the lens, which shifts the infrared transmission region for off-axis light, reducing the incident angle and suppressing off-axis aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a lens is used to focus infrared light onto the detecting device, then light collection capability is improved, but off-axis aberration increases causing degradation in detection precision
Solution Approach 1:
A member with an opening is introduced as an intermediary component between the lens and the infrared detecting device. This member selectively transmits on-axis light while blocking off-axis light through its opening structure, thereby reducing off-axis aberration without compromising the light collection capability of the lens.
Solution Approach 2:
The member includes an opening with specific geometric characteristics (aperture ratio between 0.3-0.7, depth-to-diameter ratio between 0.05-0.5) that create localized optical filtering effects. The opening's specific dimensions and positioning create different optical paths for on-axis versus off-axis light, improving detection precision for off-axis objects.
2Object-generated harmful factors
If the member opening is made smaller to block more off-axis light, then off-axis aberration is reduced, but light transmission for on-axis objects is compromised
Solution Approach 1:
The opening's geometric parameters are optimized within specific ranges: aperture ratio (opening diameter to lens diameter) between 0.3-0.7 and depth-to-diameter ratio between 0.05-0.5. These parameter ranges balance the competing requirements of blocking off-axis light while maintaining sufficient on-axis light transmission.
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
Improves resolution for off-axis light and reduces the occurrence of off-axis aberration, enhancing the detection precision and sensitivity of the infrared sensor.
Implementation Method 1
there is a concern about degradation in detection precision because an off-axis aberration occurs in a case where infrared (an off-axis light) emitted from an off-axis object point is detected
Implementation Method 2
The gap is disposed between the member and the lens and has a wider range than the opening
Data Source
AI summary
An infrared sensor includes: an infrared detecting device; a lens disposed above the infrared detecting device; an member that is disposed at a side of an upper surface of the lens and includes an opening; and a gap that intervenes between the member and the lens and has a wider range than the opening.