Spectrometer Self-Calibration Using Fill Gas Absorption Bands
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Solution Overview
Problem
Existing spectrometer systems for agricultural products and foodstuffs require external wavelength standards and recalibration due to the sensitivity of NIR spectroscopy to the condition of the measurement window, leading to increased maintenance and potential inaccuracies from window contamination or damage.
Innovation Solution
A spectrometer system with internal recalibration standards, such as a white and black standard, and a fill gas with absorption bands, allowing for self-testing and recalibration without external references, using the fill gas's absorption bands to maintain calibration accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external wavelength standards and recalibration are used, then measurement accuracy can be maintained, but maintenance costs increase and measurement time is lost due to cyclical recalibration
Solution Approach 1:
The spectrometer system performs self-calibration using an internal wavelength standard and fill gas absorption bands. The control unit automatically detects shifts in absorption band positions and adjusts the wavelength calibration without external intervention, enabling the system to maintain accuracy autonomously without requiring external standards or manual recalibration procedures
Solution Approach 2:
The wavelength standard and fill gas are pre-installed within the spectrometer housing to establish reference absorption bands before measurement begins. This preliminary setup creates a built-in reference system that continuously monitors and corrects wavelength drift throughout operation, eliminating the need for post-measurement recalibration
2Measurement precision
If external wavelength standards and recalibration are used, then measurement accuracy can be maintained, but maintenance costs increase
Solution Approach 1:
The spectrometer system performs self-calibration using an internal wavelength standard and fill gas absorption bands. The control unit automatically detects shifts in absorption band positions and adjusts the wavelength calibration without external intervention, enabling the system to maintain accuracy autonomously without requiring external standards or manual recalibration procedures
Solution Approach 2:
The fill gas serves multiple functions simultaneously: it provides wavelength calibration reference through its absorption bands, protects the measurement window, and enables continuous monitoring of spectrometer performance. This multi-functionality eliminates the need for separate external calibration standards and reduces maintenance requirements
3Productivity
If the measurement window is used continuously, then productivity is maintained, but the window becomes dirty or damaged requiring replacement
Solution Approach 1:
A protective fill gas is introduced into the housing between the measurement window and the external environment. This intermediary gas layer protects the window from contamination and damage during continuous operation, maintaining optical clarity and measurement reliability without interrupting productivity
Solution Approach 2:
The housing is filled with an inert or protective gas atmosphere that prevents contamination of the measurement window and internal optical components. This inert environment protects against moisture, oxygen, and particulate damage, allowing continuous measurement operation while maintaining window integrity and optical performance
4Loss of time
If internal recalibration standards are implemented, then recalibration speed increases, but device complexity increases
Solution Approach 1:
The wavelength calibration standard, fill gas, and measurement optical path are merged into a single integrated system within the housing. The same light path used for measurement also passes through the fill gas absorption bands for wavelength reference, eliminating separate calibration mechanisms and reducing overall system complexity while enabling rapid self-calibration
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 fast and accurate testing and recalibration of the spectrometer system, reducing maintenance costs and ensuring high measurement accuracy by utilizing internal standards and fill gas absorption bands, thereby maintaining reliable measurements over time.
Implementation Method 1
a fill gas with absorption bands is present in the housing... the specific absorption bands of the fill gas are detected and identified in the reference spectrum
Implementation Method 2
The plastic has pronounced absorption bands over the entire NIR range... a fill gas with absorption bands is present in the housing
Data Source
AI summary
A spectrometer system comprises a housing provided with a window, an illumination source, a spectrometer and a standard for internal recalibration being disposed in said housing. Specific absorption bands of a filling gas present in the housing are identified in a reference spectrum, which was recorded using the standard, wherein a wavelength characterizing the relevant identified specific absorption band is measured in each case such that measured values are obtained for the wavelengths of the absorption bands. A test spectrum is recorded by the spectrometer using the standard. The specific absorption bands of the filling gas are identified in the test spectrum, wherein a wavelength characterizing the relevant identified specific absorption band is measured in each case such that measured values are obtained for the wavelengths of the specific absorption bands.