Optical Lens Layout for Balanced Radial Motion Detection
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Solution Overview
Problem
Existing infrared motion detectors face challenges in setting up detection ranges differently for radial and tangential motion, as heat sources moving tangentially are detected at greater distances than those moving radially, complicating the desired detection characteristics.
Innovation Solution
An optical element with different areas of lenses having varying apertures and focal lengths is used to direct infrared radiation, where a second area with larger apertures and/or focal lengths increases radiation intensity and resolution, enhancing radial detection range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard lenses with uniform aperture and focal length are used, then the device structure is simple, but the radial detection range is shorter than tangential detection range
Solution Approach 1:
The optical element is divided into multiple regions with different lens characteristics. The first region contains lenses with standard aperture and focal length, while the second region contains lenses with larger aperture and/or longer focal length. This local differentiation allows the radial detection range to be extended in specific directions without complicating the entire optical system, thereby matching the radial detection range with the tangential detection range.
2Ease of operation
If lenses with larger aperture and focal length are used, then radial detection range is extended, but manufacturing complexity increases
Solution Approach 1:
The optical element is segmented into multiple discrete lens regions, each with specific aperture and focal length characteristics. This segmentation allows for modular manufacturing where different lens types can be produced separately and then assembled into the complete optical element, reducing overall manufacturing complexity while achieving extended radial detection range.
3Measurement precision
If lenses with larger aperture are used, then radiation intensity on sensor is increased, but device complexity increases
Solution Approach 1:
Lenses with larger aperture are strategically placed in the second region of the optical element to specifically enhance sensitivity to radial motion in directions where it is most needed. This localized approach improves measurement precision for radial motion without unnecessarily increasing device complexity across the entire optical system.
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 solution allows for a radial detection range to correspond to the tangential detection range, improving sensitivity and resolution for radial motion detection, simplifying the setup and alignment of motion detectors.
Implementation Method 1
An optical element with different areas of lenses having varying apertures and focal lengths is used to direct infrared radiation
Implementation Method 2
a second area with larger apertures and/or focal lengths increases radiation intensity and resolution
Implementation Method 3
Pyroelectric sensors frequently used as IR sensors have two sensor surfaces for this purpose, which can detect the incident infrared radiation
Data Source
AI summary
An optical element (100) suitable for guiding infrared radiation onto an infrared sensor (210) for detecting movements has a first region (110), in which a plurality of first lenses (112) having an aperture from a first aperture range and a focal length from a first focal length range are arranged, and has a second region (120), which lies within the first region (110) and has at least one second lens (122) having an aperture from a second aperture range having values which are greater than the values of the first aperture range, and/or having a focal length from a second focal length range having values which are greater than the values of the first focal length range.