Lensless Holographic Imaging System Using Multiplexed Optical Element
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Solution Overview
Problem
Conventional digital holographic imaging systems using holographic optical elements face limitations due to the bulkiness of magnification ratio and focal length adjusting mechanisms, which occupy large installation spaces and cause inconvenience.
Innovation Solution
A lensless holographic imaging system utilizing a partially coherent light source, a light modulator, and a multiplexed holographic optical element, which eliminates the need for lenses by using diffraction and interference signals to achieve image reconstruction, allowing for compact design and adjustable image magnification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lens or displacement device is used to adjust magnification ratio, then image magnification can be adjusted, but the installation space increases and device complexity increases
Solution Approach 1:
The patent replaces the mechanical lens-based magnification adjustment system with a digital holographic processing system. By using a multiplexed holographic optical element and digital signal processing, the system achieves variable magnification without physical lenses or displacement devices, thereby eliminating the need for large installation space while maintaining magnification adjustability
Solution Approach 2:
The patent changes the approach from physical parameter adjustment (lens position, focal length) to digital parameter processing. By encoding multiple magnification ratios into the holographic optical element and using digital signal processing to select different magnification levels, the system achieves parameter change without mechanical movement or additional optical components
2Adaptability or versatility
If a lens or displacement device is used to adjust magnification ratio, then image magnification can be adjusted, but device complexity increases
Solution Approach 1:
The patent merges multiple magnification adjustment functions into a single multiplexed holographic optical element. By combining multiple holographic patterns corresponding to different magnification ratios into one element, the system eliminates the need for separate lenses, beam splitters, and displacement devices, thereby reducing overall device complexity while maintaining multi-magnification capability
Solution Approach 2:
The multiplexed holographic optical element serves multiple functions simultaneously: it acts as both the holographic element for image formation and the magnification control mechanism. A single element provides multiple magnification ratios, replacing what would traditionally require multiple optical components and mechanisms, thus reducing device complexity
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
The system achieves a more compact form factor and allows for flexible image magnification, overcoming the space constraints and usability issues of prior art systems.
Implementation Method 1
The first object-diffracted light enters the multiplexed holographic optical element through a first surface of the multiplexed holographic optical element, passes through the multiplexed holographic optical element, and exits the multiplexed holographic optical element through a second surface of the multiplexed holographic optical element
Implementation Method 2
the at least one first interference signal generated by interference between the first object-diffracted light and the at least one beam of first system reference light
Implementation Method 3
The light modulator is configured to receive the second light beam and modulate the second light beam into at least one beam of reading light having a specific wavefront
Implementation Method 4
The partially coherent light source is configured to output a first light beam and a second light beam that are partially coherent with respect to each other
Data Source
AI summary
A lensless holographic imaging system having a holographic optical element includes: a coherent light source for outputting a first light beam and a second light beam, wherein the first light beam irradiates a first inspection plane to form first object-diffracted light; a light modulator for modulating the second light beam into reading light having a specific wavefront; a multiplexed holographic optical element, wherein the first object-diffracted light passes through the multiplexed holographic optical element, and the reading light is input into the multiplexed holographic optical element to generate a diffracted light beam as system reference light; and an image capture device for reading at least one interference signal generated by interference between the first object-diffracted light and the system reference light. The lensless holographic imaging system has a relatively small volume and relatively high diffraction efficiency.