Dual Image Angle Measurement for Transparent Objects
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Solution Overview
Problem
Current methods for determining the secondary image angle and angle of vision on transparent objects, such as windscreens, are time-consuming and require multiple testing devices, leading to increased costs and the risk of adjustment errors, especially when testing large surfaces with high measuring point densities.
Innovation Solution
An apparatus and method utilizing multiple punctiform light sources and a camera to simultaneously capture primary and secondary images on a transparent object, allowing for the determination of secondary image angles and angles of vision across the entire surface without moving the object, using an evaluation unit to calculate these angles based on image positions and trigonometric functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple testing devices are used simultaneously to test large surfaces with high measuring point densities, then measurement coverage and precision are improved, but device complexity and costs increase
Solution Approach 1:
The transparent object is divided into multiple measurement zones, each illuminated by a separate light source. The camera captures images of all zones simultaneously, allowing high measuring point density across the entire surface without requiring multiple separate testing devices. Each light source independently illuminates its assigned zone with punctiform light points, and the camera records all zones in parallel.
Solution Approach 2:
The invention transitions from sequential one-dimensional measurement along a light path to two-dimensional parallel measurement across the entire surface. Multiple light sources are arranged in a plane perpendicular to the camera's optical axis, enabling simultaneous capture of primary and secondary images from multiple zones across the transparent object's surface.
2Area of stationary object
If the transparent object is moved between successive measuring points, then measurement coverage is improved, but measurement time and risk of adjustment errors increase
Solution Approach 1:
Multiple light sources are pre-positioned to illuminate different zones of the transparent object simultaneously. The camera is positioned to capture all illuminated zones in a single exposure, eliminating the need to move the object between measurements. All measurement data is collected in parallel during one stationary measurement event.
3Measurement precision
If separate testing is performed at each point of the pane, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The invention merges multiple separate measurement operations into a single integrated measurement event. Multiple light sources illuminate different zones simultaneously, and the camera captures primary and secondary images from all zones in parallel. The evaluation unit processes all images concurrently to determine secondary image angles across the entire surface, achieving both high precision and high productivity.
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 significantly reduces the time required for quality control by enabling quick and reliable determination of secondary image angles and angles of vision with high measuring point densities, reducing costs and minimizing the risk of errors, while allowing for efficient analysis of large transparent surfaces.
Implementation Method 1
Secondary images are generated by multiple reflections and transmissions of light
Implementation Method 2
Secondary images are generated by multiple reflections and transmissions of light
Data Source
AI summary
The invention concerns an apparatus for determining a secondary image angle (20) of a light source (11) on a transparent object (14). To achieve the objective of building a simple apparatus and to determine the secondary image angle (20) with higher measuring point densities even on transparent objects (14) with large surfaces in a quick, reliable manner with few movements, the apparatus includes an illuminating device (10), which has multiple, simultaneously illuminating, punctiform light sources (11), a two-dimensional target (16a) with at least one camera (16), whereby at least one camera (16) is set up to capture the positions of a primary image (21a) and a secondary image (21b) of multiple simultaneously illuminating light sources (11) at the same time, whereby the primary image (21) and the secondary image (21b) of one light source (11) are generated on the target by one of the volume elements (14a) of the transparent object illuminated by the light source (11), and an evaluation device (18) is set up to determine the secondary image angle (20) of the respective volume element (14a) of the transparent object (14) based on the positions of the primary image (21a) and the secondary image (21b). Furthermore, a method for determining the secondary image angle is also specified.