Closed Loop Optical Feedback Synchronization for Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing single fiber scanning systems, particularly in medical procedures, rely on open loop control methods that require periodic calibration and are susceptible to mechanical instability due to environmental factors like temperature and handling variations, leading to undetected drift in image quality.
Innovation Solution
A closed loop optical feedback synchronization system that uses reflected light from a lens assembly to provide real-time feedback and control the angular and radial position of a scanning fiber, employing a single mode fiber, a cantilevered portion, a driving mechanism, and a synchronizer integrated circuit with a slot to direct reflected light to a multi-mode fiber, allowing for compensation of drift in angular velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If open loop control methods are used in single fiber scanning systems, then the system structure is simple, but the system is susceptible to mechanical instability and drift due to environmental factors
Solution Approach 1:
The patent implements a closed-loop feedback system using a return fiber to detect the actual position of the scanning fiber and provide real-time position information to a controller, which adjusts the actuator to compensate for drift. This feedback mechanism transforms the open-loop system into a closed-loop system, resolving the contradiction between simple structure and mechanical stability.
Solution Approach 2:
The patent replaces mechanical position sensing methods with optical detection using the return fiber and photodetector. Instead of complex mechanical encoders or sensors, the system uses optical reflection and detection to sense fiber position, reducing mechanical complexity while improving stability measurement capability.
2Measurement precision
If periodic calibration is performed to maintain image quality, then image accuracy is maintained, but the procedure time increases and productivity decreases
Solution Approach 1:
The patent implements continuous real-time position monitoring and compensation during the entire imaging procedure, eliminating the need for periodic calibration interruptions. The feedback system operates continuously to maintain image accuracy, allowing the procedure to proceed without stopping for recalibration, thus maintaining both precision and productivity.
Solution Approach 2:
The system performs self-calibration and self-correction through the feedback mechanism. The controller automatically adjusts the actuator based on real-time position feedback from the return fiber, enabling the system to maintain its own accuracy without external intervention or manual calibration, thereby preserving both image quality and procedure continuity.
3Reliability
If the scanning fiber angular velocity drifts due to environmental factors, then mechanical stability deteriorates, but real-time compensation requires complex control systems
Solution Approach 1:
The patent introduces the return fiber as an intermediary element that carries position information from the scanning fiber back to the detector. This optical intermediary provides a direct, real-time measurement of fiber position without requiring complex sensors or transducers, simplifying the control system while enabling precise drift compensation.
Solution Approach 2:
The return fiber serves multiple functions: it acts as both the sensing element for position detection and as part of the overall optical system. This multi-functionality reduces the need for separate dedicated sensing components, simplifying the control system architecture while maintaining the capability for real-time angular velocity drift compensation.
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 real-time stabilization of the scanning fiber, reducing the need for frequent calibration and minimizing image distortion caused by environmental changes, by using reflected light to adjust the actuator and maintain precise image acquisition.
Implementation Method 1
a single mode fiber for directing light from a light source toward a lens assembly
Implementation Method 2
a lens assembly coupled to the barrel... a scan lens is positioned off the end of the fiber
Implementation Method 3
a multi-mode fiber for receiving light reflected from the lens
Implementation Method 4
the synchronizer integrated circuit includes a slot configured to direct the reflected light from the lens assembly to the multi-mode fiber
Data Source
AI summary
A closed loop, optical feedback synchronization system provides real time feedback and control of a light emitting fiber when scanning or displaying an image. The light emitting fiber is driven by an actuator in an angular pattern to scan the image. Light reflected from a lens assembly is received by an optical synchronizer integrated circuit that includes a slot located between walls of the circuit. The reflected light is directed toward a multi-mode fiber in optical communication with the circuit. A radial position of the reflected light as it passes the slot may be used to compensate for a drift in angular velocity of the light emitting fiber.