Position Detection in Interference Optical Modules
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Solution Overview
Problem
Existing optical modules struggle to accurately detect the position of movable portions in interference optical systems, which is crucial for determining wavelength reproducibility, resolution, and signal-to-noise ratio in spectrometers.
Innovation Solution
A position detection method that splits detection light into first and second light in an interference optical system, where the first light is incident on a returning optical path formed by a movable mirror and a beam splitter, generating multiple interference light by combining the light after each reciprocation, and extracting a second interference light signal with a wavelength of 1/p of the detection light to calculate the movable portion's position, enhancing resolution by selecting the appropriate wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wavelength of the interference light signal is shortened to improve position detection resolution, then the detection accuracy improves, but the complexity of the optical system increases
Solution Approach 1:
The patent segments the interference light signal into multiple wavelength components (first interference light signal with wavelength λ and second interference light signal with wavelength λ/p). By separating the detection into multiple wavelength channels, the system achieves high resolution without requiring a single complex optical path, thus resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent introduces a new dimension by utilizing multiple wavelength components simultaneously in the optical system. Instead of using a single wavelength, the system employs both λ and λ/p wavelengths, effectively adding a spectral dimension to the detection process. This allows the system to achieve fine position resolution through the shorter wavelength component while maintaining system simplicity through the structured multi-wavelength approach.
2Measurement precision
If multiple interference light signals are generated through light reciprocation to improve detection accuracy, then the measurement precision improves, but the optical path length increases
Solution Approach 1:
The patent merges multiple interference light signals generated through light reciprocation into a unified detection system. By combining the first interference light signal (wavelength λ) and second interference light signal (wavelength λ/p) in the spectral domain through Fourier transform analysis, the system achieves high measurement precision without requiring excessively long optical paths. The merging process allows efficient utilization of the optical path length.
Solution Approach 2:
The patent changes the wavelength parameter by utilizing multiple wavelength components (λ and λ/p) in the interference light signals. This parameter change enables the system to achieve fine position resolution through the shorter wavelength component while managing the optical path length effectively. The multi-wavelength approach allows the system to extract precise position information without being constrained by a single long optical path.
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 method allows for precise detection of the movable portion's position, improving the resolution and accuracy of position detection, thereby enhancing the performance of spectrometers in terms of wavelength reproducibility and signal-to-noise ratio.
Implementation Method 1
a remaining portion of the first light is reflected by the beam splitter to reach the beam splitter through the movable mirror
Implementation Method 2
a portion of the first light is transmitted through the beam splitter
Implementation Method 3
combining the first light transmitted through the beam splitter from the returning optical path and the second light to generate multiple interference light
Implementation Method 4
a light spectrum having a peak at each wavelength of 1/q (q is a natural number) of the wavelength of the detection light is acquired by Fourier-transforming the first interference light signal, and the second interference light signal is acquired by inverse-Fourier-transforming the light spectrum
Data Source
AI summary
Provided is a position detection method including splitting detection light into first and second light, the first light being incident on a returning optical path, a portion of the first light being transmitted through a beam splitter and a remaining portion of the first light being reflected by the beam splitter to reach the beam splitter through a movable mirror every time the first light reaches the beam splitter through the movable mirror, combining the first light transmitted though the beam splitter and the second light to generate multiple interference light, extracting a second interference light signal having a wavelength of 1/p (p is a natural number) of a wavelength of detection light from a first interference light signal of the multiple interference light, and calculating a position of the movable portion in a predetermined direction based on the second interference light signal.