Light Pipe Digital Hologram System Spatial Bandwidth
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Solution Overview
Problem
Conventional digital holographic techniques are limited by spatial bandwidth, requiring complex and time-consuming aperture synthesis methods to overcome pixel count limitations, which increases system complexity and measurement time.
Innovation Solution
A digital hologram recording system incorporating a light pipe with a reflection surface between the object and image detector to collect signal light scattered at large angles, effectively increasing pixel counts and enabling numerical reconstruction to break through spatial bandwidth limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If aperture synthesis technical scheme is used to overcome pixel count limitation, then spatial bandwidth limitation is broken through, but system complexity increases and measurement time greatly increases
Solution Approach 1:
A light pipe with reflective surfaces is introduced as an intermediary component between the object and the image detector. The light pipe collects signal light scattered at large angles and directs it to the image detector, effectively increasing the pixel count without requiring mechanical movement or complex aperture synthesis procedures.
Solution Approach 2:
The light pipe utilizes total internal reflection to redirect light paths in three-dimensional space, converting angular information into spatial information that can be captured by the image detector. This dimensional transformation enables effective pixel count expansion without mechanical scanning.
2Measurement precision
If aperture synthesis technical scheme is used to overcome pixel count limitation, then spatial bandwidth limitation is broken through, but measurement time greatly increases
Solution Approach 1:
The light pipe acts as a static intermediary that continuously collects and redirects scattered light to the image detector throughout the measurement process, eliminating the need for time-consuming mechanical scanning or aperture synthesis operations.
Solution Approach 2:
The light pipe maintains continuous light collection and redirection functionality throughout the measurement process, ensuring that all scattered light is captured simultaneously without interruption or mechanical movement, thereby significantly reducing measurement time.
3Device complexity
If conventional digital holographic techniques are used, then system complexity is low, but spatial bandwidth limitation restricts image quality
Solution Approach 1:
The light pipe is a simple optical intermediary that adds minimal system complexity while dramatically improving spatial bandwidth. It utilizes basic total internal reflection principles to collect and redirect light, avoiding complex mechanical or computational systems.
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 reduces system complexity, shortens measurement time, and improves the quality of reconstructed images by equivalent pixel count expansion, outperforming conventional methods.
Implementation Method 1
The light pipe has a reflection surface or a fully reflecting surface where the total reflection occurs
Implementation Method 2
The rays scattered from the object and the reference beam are interfered so as to form interference fringes
Data Source
AI summary
The present invention provides a digital hologram recording system and a numerical reconstruction method for a hologram, which are used for capturing an image of an object and recording it as a holographic data. Said system comprises: signal light, formed after irradiating the object with a light source; an image detector, for recording interference fringes of the signal light; and a light pipe, arranged in a path of the signal light and located between the object and the image detector, wherein the light pipe has a reflection surface, and a part of the signal light enters the image detector after reflected by the reflection surface of the light pipe. The present invention can make the collected signal equivalent to several times of the pixel counts of the image detector, thereby able to break through the spatial bandwidth limitation and shortening the amount of time required to measure the hologram.