Spectrometric Device Asymmetrical Light Limiter Linearity
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Solution Overview
Problem
Current UV absorption spectrometers face challenges in achieving high linearity and dynamic range due to limitations in light sources and detectors, particularly with UV gas discharge lamps and silicon-based detectors, which result in unreliable quantitative measurements.
Innovation Solution
A spectrometric measuring device with a broadband light source, an asymmetrical light limiter, and a two-dimensional detector oriented at 90°, along with an optical system for collimating light and a dispersive element, such as an optical grating, to enhance light separation and detection, allowing for high dynamic and linear measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If gas discharge lamps are used for UV absorption measurements, then broadband light coverage is achieved, but signal dynamics become unstable due to sharp resonance lines
Solution Approach 1:
A diffuser element is introduced as an intermediary component between the gas discharge lamp and the detector. This diffuser mediates the interaction by scattering the sharp resonance lines, converting the unstable structured light pattern into a stable uniform distribution, thereby enabling reliable quantitative measurements while maintaining broadband coverage
2Illumination intensity
If high pressure xenon lamps are used to broaden spectral lines, then continuous spectrum is achieved, but device complexity increases due to explosion-proof housing and cooling systems
Solution Approach 1:
The patent employs a standard gas discharge lamp with a diffuser instead of expensive high-pressure xenon lamps requiring special housing and cooling. The diffuser is a simple, inexpensive component that achieves the desired spectral broadening effect without the complex safety and thermal management systems
3Productivity
If conventional detectors are used with UV flash lamps, then measurements can be performed, but linearity is poor due to high signal dynamics requirements
Solution Approach 1:
The diffuser acts as a mediator that transforms the light distribution from the flash lamp, creating a uniform intensity profile across the detector surface. This preprocessing of the light signal enables conventional detectors to achieve high linearity by eliminating the extreme signal dynamics that would otherwise cause measurement errors
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 solution enables precise and reliable quantitative absorption measurements across a wide wavelength range by compensating for light source fluctuations and optimizing signal intensity distribution on the detector, improving measurement accuracy and stability.
Implementation Method 1
a broadband light source for radiating light through an entrance aperture onto a sample to be measured
Implementation Method 2
a dispersive element for separating the light according to its wavelength
Implementation Method 3
a detector for receiving light separated according to its wavelength
Implementation Method 4
an asymmetrical light limiter, also referred to herein as a spatial filter, which limits the light at an angle, for example, 90°, to the irradiation plane
Data Source
AI summary
The present disclosure includes a spectrometric measuring device for a measurement point of the process automation system, including a broadband light source for radiating light through an entrance aperture onto a sample to be measured, wherein the beam bundles of the light form an irradiation plane, a light limiter that limits the light at an angle to the irradiation plane, whereby a different amount of light results at this angle. The device further includes a dispersive element for separating the light according to its wavelength and a detector for receiving light separated according to its wavelength, wherein the light source beams the light through the sample to the entrance aperture, the light limiter and the dispersive element, and the light strikes the detector.