Optoelectronic Sensor Diaphragm Focal Plane Integration
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Solution Overview
Problem
Existing optoelectronic sensors face challenges in achieving optimal signal-to-noise ratio due to large detector surfaces that allow excessive extraneous light input, leading to signal losses and reduced measurement performance, particularly in bright environments or with poorly reflecting objects, and require complex and costly adjustments to minimize these losses.
Innovation Solution
An optoelectronic sensor manufacturing method where a diaphragm is individually manufactured to match the reception optics, positioned in the focal plane to minimize extraneous light input, and produced using 3D printing or subtractive processes, allowing precise adaptation to the received light beam without the need for complex adjustments, thereby reducing component tolerances and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a diaphragm is used to limit extraneous light, then the signal-to-noise ratio is improved, but the manufacturing complexity and cost increase due to precise adjustment and fixation requirements
Solution Approach 1:
The diaphragm is integrated directly into the reception unit structure, merging the light-limiting function with the housing structure. This eliminates separate adjustment and fixation processes while maintaining the ability to control extraneous light entering the sensor.
Solution Approach 2:
The diaphragm aperture is pre-configured during the manufacturing process rather than requiring post-manufacturing adjustment. The aperture is formed at a predetermined position that corresponds to the focal plane, eliminating the need for complex adjustment procedures.
2Measurement precision
If the diaphragm aperture is made smaller to reduce extraneous light, then the signal-to-noise ratio is improved, but useful light signal is lost
Solution Approach 1:
The diaphragm aperture is positioned at the focal plane where the received light beam has its smallest cross-section. This specific positioning allows the aperture to be optimized for size - small enough to block extraneous light while large enough to pass all useful signal light through the focal point.
Solution Approach 2:
The solution moves from adjusting aperture size in one dimension to positioning the aperture in a specific spatial dimension (focal plane). By leveraging the optical focusing property, the system achieves better light separation without simply reducing aperture diameter.
3Manufacturing precision
If low-tolerance components are used to reduce diaphragm positioning errors, then the manufacturing precision is improved, but the production cost and complexity increase
Solution Approach 1:
The diaphragm structure is merged with the reception unit housing, allowing the aperture to be formed as an integral part of the manufacturing process. This eliminates the need for separate high-precision components and assembly operations, reducing both cost and complexity while maintaining positioning accuracy.
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 approach enhances the signal-to-noise ratio, increases measurement performance, and simplifies the manufacturing process by minimizing component tolerances and avoiding the use of hazardous materials, while maintaining high precision and flexibility.
Implementation Method 1
At least the extraneous light portion which reaches the reception optics on the near field or at intermediate distances can be suppressed by the diaphragm
Implementation Method 2
The received light beam has the smallest cross-section at this diaphragm position
Data Source
AI summary
A method of manufacturing an optoelectronic sensor (10) is provided that has a reception unit (22) having a reception optics (24), a light receiver (28), and a diaphragm (26) therebetween, wherein the diaphragm (26) is arranged in a focal plane of the reception optics (24) so that a received light beam (20) generated by the reception optics is incident through the diaphragm aperture (42) of the diaphragm (26) at the point of smallest constriction. The diaphragm (26) is manufactured as an individual diaphragm using the reception optics (24).