Large area scanning hologram camera system using separable light collecting unit
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Solution Overview
Problem
Conventional optical scanning hologram cameras face challenges in capturing high-resolution holograms of large areas due to limitations in the size of the Fresnel zone plate and the scan mirror's reflective surface, restricting the target capture area.
Innovation Solution
A large-area scanning hologram camera system using a separable light collecting unit, which includes a scan beam generation unit, a scan unit, a projection unit, and multiple light collecting units, employs a Mark-Zehnder interferometer to form a scan beam, projects it onto an object, and uses separate light collecting units with different optical axes to detect reflected beams, combining signals for holographic image processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional interferometer with a Fresnel zone plate is used, then the system structure is simple, but the capture area is limited and resolution cannot be achieved for large areas
Solution Approach 1:
The system divides the light collection function into multiple separate light collecting units positioned at different locations around the projection unit. Each unit has its own optical axis and collects light from different angular perspectives, enabling large-area capture without requiring a single large complex component
Solution Approach 2:
The patent transitions from a single-axis optical system to a multi-dimensional arrangement by positioning light collecting units at different spatial locations with different optical axes. This three-dimensional configuration allows simultaneous capture of a large area while maintaining high resolution through angular diversity
2Area of stationary object
If the Fresnel zone plate size is increased to capture larger areas, then the capture area improves, but the Fresnel zone plate cannot exceed the scan mirror's reflective surface size
Solution Approach 1:
Multiple light collecting units with different optical axes serve universal light collection functions from different perspectives. This multi-functional arrangement compensates for the limited size of individual components like the Fresnel zone plate and scan mirror, enabling large-area capture capability without requiring oversized single components
3Area of stationary object
If the scan angle range is increased to expand the target area, then the capture area improves, but the distance from the object must be increased which reduces resolution
Solution Approach 1:
Multiple light collecting units act as intermediaries that collect reflected light from different angular positions and guide it to the detector. This intermediary arrangement allows the system to maintain close object distance for high resolution while achieving large area coverage through angular diversity rather than increasing scan angle range
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
Enables the capture of high-resolution scanning holograms over a large area by aligning optical axes and using signal merging processors to combine detected beams, overcoming limitations of conventional systems.
Implementation Method 1
interfere the first and second curvature beams to form a scan beam
Implementation Method 2
forming a beam pattern with the spatial distribution of a Fresnel zone plate
Implementation Method 3
projecting the beam pattern onto an object through a scan mirror
Implementation Method 4
detect a beam reflected from the object
Implementation Method 5
a light detector configured to detect a beam passing through the condensing lens system
Data Source
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AI summary
According to the present invention, the large-area scanning hologram camera system is provided which includes a scan beam generation unit configured to modulate a phase of a first beam split from a light source, convert the first beam into a first curvature beam, convert a second beam into a second curvature beam, and then interfere the first and second curvature beams to form a scan beam; a scan unit configured to receive the scan beam, project the scan beam onto an object; a projection unit including a scan lens and an imaging lens system and configured to project the scan beam onto an object plane where the object is located; and at least one light collecting unit installed on an outside of the projection unit with an optical axis different from an optical axis of the projection unit and configured to detect a beam reflected from the object.