Digital Holographic Microscope Compact Design via Grating Beam Splitting
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Solution Overview
Problem
Conventional digital holographic microscopes are limited by the need for an aslant disposed dichroic mirror, resulting in a large size due to the distance between the sample and the image sensing device, which restricts the miniaturization of the device.
Innovation Solution
The use of a grating to split the light beam into reference and object light beams, combined with an optical module that guides these beams to the image sensing device, eliminating the need for an aslant dichroic mirror and allowing for a smaller distance between the sample and the image sensing device, thereby enabling a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a dichroic mirror is used to split light beams in a conventional digital holographic microscope, then the light beam can be divided into reference and object light beams, but the dichroic mirror must be disposed at an angle (e.g., 45 degrees) between the sample and image sensing device, resulting in a large distance h and large device size
Solution Approach 1:
The patent extracts and removes the dichroic mirror from the optical system, replacing it with a beam splitter and separate optical paths. This eliminates the need for the dichroic mirror to be disposed at an angle between the sample and image sensing device, thereby reducing the distance h and device size while maintaining the light beam splitting function
Solution Approach 2:
The patent changes the spatial arrangement of optical components by introducing a beam splitter that divides the light path into separate reference and object beams traveling through different dimensions and paths, allowing the system to achieve compact configuration without requiring the dichroic mirror's angular disposition
2Volume of moving object
If the distance h between the sample and image sensing device is reduced for miniaturization, then the device size can be reduced, but the aslant disposed dichroic mirror cannot be accommodated
Solution Approach 1:
By removing the dichroic mirror entirely and replacing it with a beam splitter configuration, the patent enables significant reduction in the distance h between sample and image sensing device, achieving miniaturization that would be impossible with the conventional dichroic mirror arrangement
Solution Approach 2:
The patent segments the optical system into distinct reference beam path and object beam path after the beam splitter, allowing each path to be optimized independently for compact configuration, thereby reducing overall device volume while maintaining functional 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
This configuration allows for a reduction in the size of the digital holographic microscope while maintaining the ability to form and record interference patterns, facilitating the generation of high-quality images of the sample.
Implementation Method 1
The grating is configured for splitting the light beam into a reference light beam and an object light beam
Implementation Method 2
the reference light beam is able to impinge on the non-measuring area of the optical module and being reflected to the image sensing device
Implementation Method 3
The image sensing device is configured for collecting the reference light beam, and collecting the object light beam reflected from the sample
Data Source
AI summary
A digital holographic microscope is provided. The digital holographic microscope includes a light source, a grating, an image sensing device, and an optical module. The light source is configured for providing a light beam. The grating is disposed between the light source and a sample. The grating is configured for splitting the light beam into a reference light beam and an object light beam. The image sensing device is configured for collecting the reference light beam, and collecting the object light beam reflected from the sample. The optical module is disposed between the light source and the sample, and is configured for guiding the reference light beam to the image sensing device, and guiding the object light beam to the sample.