Spectroscopic Measurement Device Using Transmissive Phase Shifter
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Solution Overview
Problem
Existing spectroscopic measurement devices face challenges in maintaining accuracy due to environmental disturbances and mechanical errors, and struggle to obtain correct spectral characteristics when there are no textures or when spatial frequencies are low, leading to incomplete or inaccurate measurements of biological components like blood sugar and cholesterol.
Innovation Solution
A compact spectroscopic measurement device using a transmissive optical member with a wedge-shaped second transmissive part and a cylindrical lens to create a phase difference between measurement beams, allowing for easy alignment and reducing susceptibility to disturbances, while introducing spatial periodicity to generate higher-order diffraction light and eliminate texture influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reflective phase shifter with fixed and movable mirror units is used, then spectral characteristics can be obtained through interference of object beams, but the device requires high accuracy in the placement angles of mirror units and is susceptible to environmental disturbances
Solution Approach 1:
The patent replaces the mechanical reflective phase shifter system with a transmissive phase shifter that uses optical path length differences created by refraction through optical members with different refractive indices. This substitution eliminates the mechanical mirror units and their placement angle requirements, replacing them with an optical system that is inherently more stable against environmental disturbances such as temperature changes and vibrations.
Solution Approach 2:
The patent changes the fundamental parameter from reflective optics to transmissive optics, utilizing refraction rather than reflection. By introducing optical members with different refractive indices into the optical path, the system creates phase differences through optical path length variations rather than through mechanical mirror positioning, thereby improving reliability.
2Measurement precision
If a reflective phase shifter is used to obtain interference light, then spectral characteristics can be measured, but the device complexity increases due to the need for precise alignment and maintenance of mirror units
Solution Approach 1:
The patent eliminates the complex mechanical mirror unit system by substituting it with a transmissive phase shifter that uses stationary optical members. This replacement removes the need for precise alignment and maintenance of movable components, significantly simplifying the device structure while maintaining the ability to obtain interference light for spectral measurements.
3Illumination intensity
If spatially coherent light is used in Koehler illumination, then the zeroth-order light reaches the objective lens as a collimated beam, but no higher-order light is generated from samples with no texture, making spectral characteristics impossible to obtain
Solution Approach 1:
The patent introduces optical members with different refractive indices into the optical path to create optical path length differences. This parameter change enables the generation of higher-order diffraction light even from samples without texture, while maintaining the benefits of collimated beam illumination. The refractive index variation creates the necessary phase differences for spectral measurement.
Solution Approach 2:
The patent introduces transmissive optical members as intermediaries in the optical path between the light source and the sample. These optical members with different refractive indices act as mediators that create the necessary phase differences and generate higher-order light, enabling spectral characteristics to be obtained from texture-less samples while preserving the collimated beam quality.
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 device achieves accurate spectral measurements by minimizing the impact of disturbances and texture effects, enabling reliable detection of biological components without the need for high-accuracy alignment of mirror units and ensuring interference light is obtained even in texture-less samples.
Implementation Method 1
a transmissive phase shifter 13 including a first transmissive part 131 and a second transmissive part 132, each having a different refractive index
Implementation Method 2
the first and second measurement beams enter the cylindrical lens 14 with a phase difference, forming an interference light on the imaging plane of the cylindrical lens 14
Implementation Method 3
a portion of the measurement beam which has entered the objective lens enters the first transmissive part 131 and subsequently enters the cylindrical lens 14
Data Source
Figure 1~2D
Figure 3~5(c)
Figure 6A~7B
AI summary
A spectral characteristics measurement device according to present invention includes: a dividing optical system for dividing a measurement beam emitted from each of a plurality of measurement points located within a measurement area of an object to be measured, into a first measurement beam and a second measurement beam; an imaging optical system for making the first measurement beam and the second measurement beam interfere with each other; an optical path length difference providing means for providing a continuous distribution of an optical path length difference between the first measurement beam and the second measurement beam; a detector for detecting the light intensity distribution of the interference light; a processor for acquiring an interferogram of a measurement point of the object to be measured based on the light intensity distribution of the interference light detected by the detector, and for Fourier-transforming this interferogram to obtain a spectrum; a conjugate plane imaging optical system located between the object to be measured and the dividing optical system, the conjugate plane imaging optical system having a conjugate plane shared with the dividing optical system; and a periodicity providing means located on the conjugate plane, for providing a periodicity among the measurement beams emitted from the plurality of measurement points.