Miniature Spectrometer Using Diffuser-Based Polarization Interferometry
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Solution Overview
Problem
Conventional spectrometers face challenges in miniaturization, cost-effectiveness, user-friendliness, and accuracy due to dependence on the angle of incidence and distance from the object, as well as interference from ambient light and complex background signals.
Innovation Solution
A miniature spectrometer with a diffuser-based optical system, polarization interferometer, and a detection unit that includes a focusing optical unit and a data unit capable of internal or external evaluation, allowing for compact construction, independence from ambient light, and improved signal-to-noise ratio through spatially resolved interferograms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional spectrometer designs are used, then spectral measurement capability is achieved, but the device size remains large and complex
Solution Approach 1:
The patent implements nesting by placing the diffuser inside the Savart element structure, where the diffuser is positioned within the birefringent crystal assembly. This nested configuration allows the optical components to occupy overlapping spatial volumes, significantly reducing the overall spectrometer footprint while maintaining functional integrity of each component
Solution Approach 2:
The patent merges the diffuser function with the Savart element by integrating the diffusing optical element directly into the birefringent crystal assembly. This combination eliminates the need for separate alignment mechanisms and housing structures for individual components, thereby reducing device complexity and size simultaneously
2Measurement precision
If conventional optical systems are used without a diffuser, then angle of incidence dependence affects measurement accuracy, but adding a diffuser increases device complexity
Solution Approach 1:
The diffuser integrated into the Savart element serves multiple functions simultaneously: it homogenizes the angular distribution of incident light to eliminate angle-dependent measurement errors, and it maintains the polarization beam splitting function of the Savart element. This multi-functionality achieves measurement precision improvement without proportionally increasing device complexity
Solution Approach 2:
The patent applies local quality by positioning the diffuser specifically at the light entry point of the Savart element, where angular homogenization is most critical. The diffuser is localized to the region where light first enters the birefringent crystal, providing angle independence precisely where needed without adding complexity to other parts of the optical system
3Measurement precision
If ambient light is present during measurement, then background signals interfere with spectral data, but eliminating ambient light requires controlled environments
Solution Approach 1:
The patent converts the harmful effect of ambient light into a beneficial measurement capability by using the light source to actively illuminate the measurement target. The system measures the reflected or transmitted light from the target, which carries spectral information about the target material. This active illumination approach transforms the problem of ambient light interference into an advantage, allowing measurements in non-controlled environments while maintaining high signal-to-noise ratios
4Adaptability or versatility
If a light source is added to illuminate the measurement target, then measurement capability in non-controlled environments is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent merges the light source with the existing optical path by positioning it to illuminate the measurement target through the same optical components used for detection. The light source is integrated into the housing structure and shares alignment mechanisms with the detector, eliminating the need for separate illumination and detection alignment systems. This merging approach increases environment adaptability while minimizing the addition of complexity
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 miniature spectrometer achieves enhanced accuracy and reproducibility by eliminating angle and distance dependencies, allowing for precise spectral analysis independent of ambient light and enabling measurements in non-controlled environments with improved signal quality.
Implementation Method 1
the optical system is in the form of a diffuser. The resolution of a miniature spectrometer according to the disclosure advantageously is not dependent on the nature of the object and the type of the light source, because in the miniature spectrometer according to the disclosure, the diffuser always ensures that the acceptance angle of the Savart element of the miniature spectrometer is fully utilized.
Implementation Method 2
a polarization interferometer comprising a polarizer, a Savart element and an analyzer. Both components are present at the same time and must be separated from one another. This two-dimensional distribution is recorded using a two-dimensional CCD (charge-coupled device) detector. The PIS comprises an infinity optical system, a polarization interferometer comprising a polarizer, a Savart polariscope and an analyzer
Implementation Method 3
a polarization interferometer comprising a polarizer, a Savart element and an analyzer. Both components are present at the same time and must be separated from one another.
Implementation Method 4
a detection unit comprising a detector. This two-dimensional distribution is recorded using a two-dimensional CCD (charge-coupled device) detector.
Data Source
AI summary
A miniature spectrometer includes an optical system, a polarization interferometer with a polarizer and a Savart element and an analyzer, a detection unit with a detector, and a data unit. The optical system of the miniature spectrometer is configured as a diffuser.