Gap-Free Optical Filter Lens for Optoelectronic Sensors
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Solution Overview
Problem
Optoelectronic sensors face challenges in achieving high detectivity and interference resistance due to excessive extraneous light filtering, caused by tolerance effects and non-ideal radiation imaging, leading to broad band filters and increased costs.
Innovation Solution
The integration of an optical filter element between part lenses, forming a gap-free connection, with a convex or concave shape that aligns with the wavefront of incoming radiation, ensuring all beams pass through at the same angle, reducing extraneous light and improving signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a broad band filter is used to accommodate wide angular range of incident radiation, then the filter can be designed with narrower band, but extraneous light portions increase
Solution Approach 1:
The filter element is given a convex or concave shape that corresponds to the wavefront of the incident radiation. This curvature ensures that all light beams, regardless of their angle of incidence, pass through the filter at the same angle (perpendicular to the filter surface), thereby maintaining narrow band filtering effectiveness while accommodating the wide angular range of incident radiation from the reception lens
2Measurement precision
If a filter is placed in front of the reception optics, then the filter area increases, but costs increase due to large size
Solution Approach 1:
The filter element is integrated into the reception lens structure itself, nesting the filtering function within the existing optical component. The filter element is arranged without gap between the first and second part lenses, effectively combining multiple functions (lensing and filtering) into a single integrated unit, thereby avoiding the need for a separate large-area filter component
3Measurement precision
If filters are applied to front screens, then the filter can be designed with narrower band, but the filter has very large area
Solution Approach 1:
The filtering function is merged with the reception lens by integrating the filter element directly into the lens structure. The filter element is arranged without gap between the first and second part lenses, combining the optical focusing function of the lens with the wavelength selection function of the filter in a single compact 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 enhances detectivity and reduces costs by optimizing filter efficiency and size, maintaining signal quality and reducing interference, while simplifying installation and maintaining temperature invariance of optical properties.
Implementation Method 1
the optical filter element has at least a convex or concave shape and received light beams pass through the filter element at the same angle at every entry point
Data Source
AI summary
An optoelectronic sensor having a reception element and at least one reception lens and an optical filter element, wherein the filter element is arranged without a gap between a first part lens and a second part lens, wherein the part lenses form one of the reception lenses or the reception lens, and wherein the optical filter element has at least one convex or concave shape and received light beams pass through the filter element at the same angle at every entry point or an optoelectronic sensor having a reception element and a reception lens and an optical filter element that is arranged between the reception element and the reception lens, wherein the optical filter element has at least one curved free-form surface so that the received light beams pass through the filter element at the surface of the optical filter element at the same angle at every entry point.