Spectroscopic Measurement Apparatus Using Spatial Filter for High-Speed Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current spectroscopic measurement techniques face challenges in achieving high-speed measurements while maintaining an inexpensive configuration, as they often require extensive data collection or the use of multiple detectors, making them costly and inefficient.
Innovation Solution
A spectroscopic measurement apparatus comprising a light source, a diffraction grating as a spectroscopic unit, a spatial filter unit that applies wavelength-dependent loss, and a detection unit to differentiate between absorption and non-absorption bands, allowing for high-speed and cost-effective evaluation of measurement samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Fourier transform infrared spectroscopy (FTIR) is used to obtain detailed absorption information, then measurement precision is improved, but measurement time increases significantly
Solution Approach 1:
The spectrum is segmented into multiple wavelength bands, with specific bands selected for measurement based on the absorption characteristics of the target substance. Instead of measuring the entire spectrum, only relevant wavelength regions are measured, significantly reducing measurement time while maintaining precision for the target analyte.
Solution Approach 2:
The invention applies wavelength-selective measurement by assigning different detectors to specific wavelength bands. Each detector is optimized for its assigned band, allowing precise measurement of absorption characteristics in critical regions without the need to measure all wavelengths at high resolution.
2Productivity
If multiple detectors are used to simultaneously detect light intensities at different wavelengths, then measurement speed is improved, but device cost increases
Solution Approach 1:
A single detector is designed to detect multiple wavelength bands by using wavelength separation optics (prisms or gratings) that direct different wavelength ranges to the same detector at different positions. This allows one detector to perform the function of multiple detectors, reducing cost while maintaining simultaneous multi-wavelength measurement capability.
Solution Approach 2:
Wavelength separation optics act as intermediaries that spatially separate different wavelength components of the light beam before they reach the detector. This intermediary component enables a single detector to receive and measure multiple wavelength bands simultaneously by directing them to different detection regions.
3Device complexity
If bandpass filters are sequentially switched to measure absorption at different wavelengths, then device cost is reduced, but measurement speed decreases
Solution Approach 1:
The spectrum is divided into multiple wavelength bands that can be simultaneously measured. By using optical elements to spatially separate wavelength bands and directing them to different detection regions, the system measures multiple bands in parallel rather than sequentially, achieving both cost-effectiveness and high measurement speed.
4Device complexity
If a single wavelength measurement is performed, then device complexity is reduced, but the ability to distinguish between different substances with similar absorption wavelengths is compromised
Solution Approach 1:
The invention measures absorption characteristics at multiple specific wavelength bands simultaneously, with each band selected based on the absorption spectrum of the target substance. This localized multi-band measurement approach provides sufficient spectral information to distinguish between different substances without requiring a complete spectrum measurement, balancing simplicity and discrimination ability.
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
Enables high-speed measurement with reduced costs by using a spatial filter unit to selectively apply losses based on wavelength, improving sensitivity and discrimination ability without the need for multiple detectors.
Implementation Method 1
a spectroscopic unit spatially dispersing the light output from the light source, and outputting the light to different optical paths according to a wavelength
Implementation Method 2
a spatial filter unit inputting the light output from the spectroscopic unit to different positions according to the wavelength, applying loss depending on the wavelength to the light
Data Source
AI summary
A spectroscopic measurement apparatus includes a light source, a diffraction grating being a spectroscopic unit, a spatial filter unit, a detection unit, and an analysis unit. The diffraction grating spatially disperses light from the light source, and outputs the light to different optical paths according to a wavelength. The spatial filter unit inputs the light from the diffraction grating to different positions according to the wavelength, applies loss depending on the wavelength to the light, and outputs the light. The detection unit detects the intensity of the light from the spatial filter unit. The analysis unit obtains the intensities of light in an absorption band and light in a non-absorption band of a component in a measurement sample on an optical path between the light source and the detection unit based on the detection result, and evaluates the component in the measurement sample.