Optical Fiber Scanning System with Correction Circuit
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Solution Overview
Problem
Existing optical fiber scanning systems for endoscopes face challenges in achieving precise two-dimensional scanning and efficient feedback control, particularly in dark environments like the human body, due to limitations in magnetic field detection and drive signal processing.
Innovation Solution
The system employs a tubular optical fiber with a magnet and four sets of rotationally symmetric drive and detection coils, utilizing a signal output circuit, voltage-current conversion, and a controller for feedback control, along with a correction circuit to isolate the magnet's magnetic field signal, enabling efficient two-dimensional scanning by removing drive magnetic field signals from detection signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If drive coils generate a strong drive magnetic field to drive the optical fiber, then the scanning capability is improved, but the detection of magnet movement becomes difficult due to interference from the drive magnetic field signal
Solution Approach 1:
The patent extracts and removes the drive magnetic field signal from the detection signal through signal processing. The correction circuit specifically removes the drive magnetic field signal component from the detection signal, isolating the magnet movement signal for accurate measurement while maintaining strong drive capability.
Solution Approach 2:
The patent introduces a correction circuit as an intermediary element between the detection coils and the control system. This correction circuit processes the detection signal by removing the drive magnetic field interference, enabling accurate magnet movement detection despite the presence of strong drive fields.
2Measurement precision
If feedback control is implemented to improve scanning precision, then the control accuracy is improved, but the system complexity increases due to additional signal processing circuits
Solution Approach 1:
The patent combines the correction circuit functionality within the existing feedback control system architecture. The correction circuit integrates with the feedback control loop, merging signal processing functions rather than adding completely separate systems, thereby reducing overall complexity while maintaining precision.
3Area of stationary object
If multiple coil sets are used to achieve two-dimensional scanning, then the scanning coverage is improved, but the device complexity and signal processing difficulty increase
Solution Approach 1:
The patent employs four coil sets arranged in an asymmetric configuration relative to the optical fiber axis, with each coil set positioned at different angular orientations. This asymmetric arrangement enables two-dimensional scanning coverage while simplifying the individual coil designs compared to symmetric multi-coil configurations.
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 stable and efficient two-dimensional scanning of the optical fiber, improving image acquisition in endoscopes by enhancing the precision and control of the light spot, even in low-light conditions.
Implementation Method 1
detection coils configured to output a detection signal that is an induced electromotive force signal in response to variation of a magnetic field
Implementation Method 2
drive coils configured to apply a drive magnetic field generated using an inputted drive power signal to the magnet
Data Source
AI summary
An optical fiber scanning system includes: an optical fiber with a magnet; four drive coils configured to apply a drive magnetic field generated using a drive power signal to the magnet; four detection coils configured to output a detection signal in response to variation of a magnetic field; a controller configured to perform feedback control of the drive power signal; a signal output circuit configured to output a drive signal; a voltage-current conversion circuit configured to convert the drive signal to the drive power signal; and a correction circuit configured to output a magnet magnetic field signal by removing the drive magnetic field signal from the detection signal, and the controller controls the signal output circuit based on the magnet magnetic field signal.