Lens Center Offset Detection via Digital Holography
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Solution Overview
Problem
Current methods for detecting lens center offset, such as reflection and transmission techniques, require complex optical systems and mechanical scanning, making them inefficient and inaccurate, especially for lenses with varying focal lengths.
Innovation Solution
A digital laser holography-based system that uses a spherical wave emission device, reticle, and image sensor to form a hologram, allowing for accurate detection of lens center offset without mechanical scanning and complex optical systems, utilizing a semiconductor laser and optical fiber collimator to generate a spherical wave and reconstruct reticle images for precise measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reflection or transmission methods are used to detect lens center offset, then measurement can be performed, but the optical receiving system becomes complex and mechanical scanning is required
Solution Approach 1:
The patent replaces mechanical scanning with digital holographic reconstruction. Instead of physically moving components to scan the lens, the system uses digital processing of holographic interference patterns to determine lens center offset, thereby eliminating complex mechanical scanning mechanisms while maintaining measurement capability
Solution Approach 2:
The patent creates a virtual image of the lens through digital holographic reconstruction rather than requiring direct optical imaging. By recording and reconstructing the holographic pattern, the system obtains a virtual copy of the lens image that can be analyzed computationally, avoiding the need for complex optical receiving systems
2Measurement precision
If parallel light is emitted to the lens and image point trajectory is tracked, then center offset can be calculated, but the detection process becomes time-consuming and inefficient
Solution Approach 1:
The patent performs preliminary holographic recording of the lens image before any measurement calculations are made. By capturing the complete holographic information in a single exposure, the system prepares all necessary data in advance, allowing rapid computational analysis without time-consuming sequential scanning or trajectory tracking
Solution Approach 2:
The patent replaces the mechanical process of rotating the lens and tracking image point trajectories with digital computational methods. The holographic interference pattern contains all positional information, which can be extracted through image processing algorithms, eliminating the need for mechanical rotation and sequential measurement
3Adaptability or versatility
If an optical receiving system with infinite zoom range is used to focus on the lens, then clear images can be obtained for various focal lengths, but such a system is practically impossible to implement
Solution Approach 1:
The patent creates a universal detection system that can handle lenses of any focal length through digital holographic reconstruction. The holographic recording process captures optical path information that, when reconstructed digitally, produces a virtual image at a fixed plane regardless of the lens's focal length, making the system adaptable to all lens types without requiring variable optical components
Solution Approach 2:
The patent replaces the impossible mechanical solution of an infinitely zoomable optical system with a digital computational approach. The holographic interference pattern encodes depth and focal information that can be processed computationally to focus on lenses of any focal length, eliminating the need for physically adjusting optical components
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 method provides high efficiency and accuracy in detecting lens center offset, capable of handling lenses with infinitely great focal lengths, simplifying the detection process and avoiding the need for complex optical systems and mechanical scanning.
Implementation Method 1
diffract the spherical wave through the reticle and acquire a hologram formed by interference superposition
Implementation Method 2
acquire a hologram formed by interference superposition of a diffracted wave and a reference light wave that does not change
Implementation Method 3
the semiconductor laser, the optical fiber collimator and the lens may be sequentially arranged at the front end of the pinhole plate, and generated laser may be coupled through the optical fiber collimator and then focused to a pinhole through the lens to form a point light source to emit the spherical wave
Data Source
AI summary
The invention discloses a digital laser holography-based rapid lens center offset detection device, which relates to the technical field of lens detection and includes a spherical wave emission device, a reticle, a lens to be detected, an image sensor and a computer. The device is simple and stable in structure, and a complex optical receiving system and mechanical scanning are avoided. A detection method is high in efficiency and measurement accuracy, a process is simple, and a lens with an infinitely great focal length may be detected.