Variable-Range Fourier Domain Imaging Lens System
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Solution Overview
Problem
Conventional Fourier domain imaging systems are limited by their narrow range of imaging distances, leading to sub-optimal performance at both large and short distances due to fixed field of view and angular resolution configurations.
Innovation Solution
Incorporating an adjustable lens system downstream of a scanner, which allows for simultaneous adjustment of the field of view and angular resolution based on desired imaging distances, along with an adjustable beam expander to optimize the Rayleigh length and beam size for multiple imaging distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the field of view is increased for large area imaging, then the imaging area is improved, but the angular resolution deteriorates
Solution Approach 1:
The patent implements a variable focal length lens system that can dynamically change its optical power. By adjusting the focal length, the system can switch between wide-field imaging mode (larger field of view) and high-resolution mode (better angular resolution), allowing optimal performance for different imaging scenarios without being locked into a fixed configuration
Solution Approach 2:
The system changes the optical parameter (focal length) of the lens to adapt to different imaging requirements. This parameter change enables the system to optimize the trade-off between field of view and angular resolution by selecting appropriate focal length values based on the specific imaging task
2Length of stationary object
If the optics are optimized for large field of view, then the imaging distance is improved, but the close range imaging performance deteriorates
Solution Approach 1:
The variable focal length lens allows the system to adapt its optical characteristics dynamically. For distant imaging, the lens is configured with appropriate focal length to maximize imaging distance performance, while for close-range imaging, the focal length is adjusted to optimize near-field performance, thus achieving versatility across multiple imaging ranges
Solution Approach 2:
The optical system is designed to perform multiple functions by incorporating the adjustable focal length capability, enabling it to serve both distant and close-range imaging applications with a single system rather than requiring separate optimized systems for each 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 clear imaging of objects at a wide range of distances by dynamically adjusting the optical system to accommodate varying imaging requirements, enhancing flexibility and image quality without the need for multiple imaging systems.
Implementation Method 1
a light source configured to generate an optical beam and project the optical beam along an optical path
Implementation Method 2
a scanner disposed on the optical path, the scanner being configured to direct a sample component of the optical beam along one of a plurality of different directions
Implementation Method 3
a lens system disposed downstream of the scanner configured to project the sample component to an imaging area defined by a field of view of the optical system
Implementation Method 4
The optical element is further configured to combine the reference component with a reflected portion of the sample component that reflects off an object placed in the imaging area to produce an interference pattern
Implementation Method 5
a detector configured to receive the interference pattern
Data Source
AI summary
An optical system includes a light source, an interferometer, and a detector. The interferometer includes a scanner and a lens system disposed downstream of the scanner. The scanner is configured to direct a portion of the optical beam along one of a plurality of different directions within a scanning range. The lens system is configured to project the portion of optical beam to an imaging area defined by a field of view of the optical system, the lens system comprising a first lens, wherein an aspect of the first lens is adjustable so as to render the field of view adjustable without adjusting the scanning range of the scanner. The detector is configured to receive a reflected portion of the optical beam that reflects from an object placed within the imaging area.