Wavelength Calibration Using Moving Average Spectrum
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Solution Overview
Problem
Conventional wavelength calibration techniques using light emitting diodes suffer from errors due to light intensity ripple and unevenness, leading to inaccuracies in wavelength measurement.
Innovation Solution
A method and apparatus that obtain a corrected spectrum by reducing dependencies on the full width at half maximum of the emission band and intensity ripple period, allowing for accurate wavelength calibration by comparing attenuated wavelength components to predetermined absorption wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light emitting diode is used as a reference light source, then the wavelength calibration can be performed, but light intensity ripple and unevenness cause errors in absorption wavelength detection
Solution Approach 1:
A moving average spectrum is introduced as an intermediary to mediate between the observed spectrum (containing ripple) and the absorption wavelength detection. The moving average spectrum acts as a filter that smooths out the intensity ripple while preserving the absorption features, enabling accurate wavelength measurement without being affected by the LED's intensity variations
Solution Approach 2:
The invention changes the parameter of wavelength resolution to be larger than the full width at half maximum of the emission band. This parameter change allows the system to overcome the limitations imposed by the LED's emission characteristics and intensity ripple, achieving accurate wavelength calibration despite using a light emitting diode as the reference source
2Measurement precision
If the wavelength resolution is made larger than the full width at half maximum of the emission band, then accurate wavelength calibration is achieved, but the ability to resolve fine spectral features is reduced
Solution Approach 1:
The moving average spectrum is calculated in advance as a preliminary processing step. This preliminary action smooths the observed spectrum before absorption wavelength detection, removing the harmful effects of intensity ripple and unevenness while preserving the essential spectral features needed for accurate calibration
Solution Approach 2:
The moving average spectrum serves as an intermediary between the raw observed spectrum and the final absorption wavelength detection. It mediates by providing a smoothed version of the spectrum that eliminates ripple effects while maintaining the absorption features necessary for accurate wavelength measurement
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 approach significantly improves the accuracy of wavelength calibration by minimizing errors caused by light intensity ripple and unevenness, resulting in highly accurate wavelength measurements.
Implementation Method 1
The gas absorption cell causes light absorptions at particular wavelengths that correspond to reference wavelengths
Implementation Method 2
A light emitting diode is performed as a reference light source to emit a reference light with a predetermined wavelength band
Data Source
AI summary
In a wavelength calibration method, an observed spectrum of a light that has a wavelength band is obtained, wherein the light has at least an attenuated wavelength component that corresponds to at least a predetermined absorption wavelength that is included in the wavelength band. A corrected spectrum is then obtained from the observed spectrum, wherein the corrected spectrum has reduced dependencies upon the full width at half maximum of an emission band of the light and upon an intensity ripple period of the light.