Phase-Resolved OFDI Calibration Signal Timing Error Correction
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Solution Overview
Problem
Conventional Optical Frequency Domain Imaging (OFDI) systems face reduced performance due to timing-induced phase errors, which affect the accuracy of phase-resolved measurements in turbid or scattering media, such as in blood flow imaging and optical thickness monitoring.
Innovation Solution
The generation and use of calibration signals to correct timing-induced phase errors, either simultaneously with the sample signal or on a separate channel, allowing for precise adjustment and minimization of these errors, thereby enhancing the sensitivity of depth-resolved phase measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase-resolved measurements are performed in OFDI systems, then sensitivity to blood flow and optical thickness changes is improved, but timing-induced phase errors reduce measurement accuracy
Solution Approach 1:
A calibration signal is introduced as an intermediary reference that experiences the same timing-induced phase errors as the sample signal. By measuring the phase of this calibration signal at a known depth, the system can identify and correct the timing errors, thereby eliminating their harmful effect on sample measurements while preserving the sensitivity improvements from phase-resolved detection
Solution Approach 2:
The system uses the calibration signal to generate feedback information about timing-induced phase errors. This feedback is then applied to correct the sample measurements, creating a closed-loop system that continuously compensates for timing errors and maintains high measurement accuracy and reliability
2Measurement precision
If calibration signals are used to correct phase errors, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The calibration signal is generated within the existing OFDI system using the same wavelength-swept laser source and interferometric detection path. The system uses its own resources (the calibration mirror and existing optical components) to generate and process the calibration signal, eliminating the need for separate external calibration equipment and minimizing additional complexity
Solution Approach 2:
The calibration signal generation uses the same optical path, detector, and processing electronics as the sample signal. The single detector and data processing system serve dual purposes: acquiring both sample data and calibration data, thereby correcting phase errors without requiring separate dedicated calibration hardware channels
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 significantly reduces spurious phase measurements, improving the sensitivity and accuracy of phase-resolved imaging, enabling effective monitoring of blood flow and optical thickness changes, even at high flow rates and large phase differences.
Implementation Method 1
a wavelength-swept laser source
Implementation Method 2
an interferometer to detect interference between light from the sample and reference
Implementation Method 3
obtain a signal associated with at least one phase of at least one frequency component of the interference
Data Source
AI summary
Apparatus, system and method are provided which utilize signals received from a reference and a sample. In particular, a radiation is provided which includes at least one first electro-magnetic radiation directed to the sample and at least one second electro-magnetic radiation directed to the reference. A frequency of the radiation varies over time. An interference can be detected between at least one third radiation associated with the first radiation and at least one fourth radiation associated with the second radiation. It is possible to obtain a particular signal associated with at least one phase of at least one frequency component of the interference, and compare the particular signal to at least one particular information. Further, it is possible to receive at least one portion of the radiation and provide a further radiation, such that the particular signal can be calibrated based on the further signal.