Tunable Laser Spectrometer Wide-Scan Calibration
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Solution Overview
Problem
Conventional spectrometers with tunable laser light sources are limited in their ability to scan wide wavelength ranges, leading to uncertainty in concentration quantification and requiring factory re-calibration for analysis of spectral features at different wavelengths, which is costly and inefficient, especially when analyzing multiple analytes with complex or variable backgrounds.
Innovation Solution
A method using a tunable laser spectrometer with dynamically adjustable operating parameters, such as wavelength, temperature, and current, to scan multiple spectral features in a single pass, allowing for accurate analysis of multiple analytes without the need for re-calibration, and compensating for non-linear effects and collisional broadening to maintain calibration accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional spectrometer uses a tunable laser light source to scan wavelength ranges, then it can analyze specific spectral features, but it is limited in scanning wide wavelength ranges and requires factory re-calibration for different wavelengths
Solution Approach 1:
The patent segments the wavelength scanning process into multiple discrete wavelength ranges, each with its own optimized calibration parameters. The system performs separate scans for different wavelength ranges (e.g., first wavelength range with first parameters, second wavelength range with second parameters) and combines the results, allowing wide overall scanning range while maintaining precision in each segment
Solution Approach 2:
The patent changes operating parameters (such as laser current, temperature, modulation depth) depending on the specific wavelength range being scanned. By dynamically adjusting these parameters based on the target wavelength range and spectral features, the system maintains optimal measurement precision across a wide overall scanning range
2Measurement precision
If a spectrometer requires factory re-calibration for analyzing spectral features at different wavelengths, then measurement accuracy is maintained, but cost and efficiency decrease
Solution Approach 1:
The patent performs preliminary calibration for multiple wavelength ranges during the initial setup phase, storing calibration parameters for each range. This preliminary action eliminates the need for repeated factory re-calibration when analyzing different analytes, as the system can switch between pre-calibrated wavelength ranges without additional calibration steps
Solution Approach 2:
The patent creates a universal calibration framework where a single calibration process establishes parameters for multiple wavelength ranges. This multi-functional calibration approach allows the same spectrometer to accurately analyze various analytes across different wavelength ranges without requiring separate calibration procedures for each application
3Device complexity
If a spectrometer scans wide wavelength ranges with a single light source, then hardware requirements and costs are reduced, but maintaining calibration accuracy becomes more difficult
Solution Approach 1:
The patent employs dynamic adjustment of operating parameters based on the current wavelength range and detected spectral features. The system continuously adapts parameters such as laser current, temperature, and modulation depth during operation, maintaining calibration accuracy across wide wavelength ranges without requiring multiple fixed light sources or complex hardware changes
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 accurate and robust analysis of multiple analytes over wide wavelength ranges with a single light source, reducing hardware requirements, maintenance costs, and calibration complexity, while maintaining high accuracy and precision even with changing gas stream compositions.
Implementation Method 1
a laser light source... adjusting a wavelength of light of a beam emitted by the laser light source
Implementation Method 2
In the case of absorption spectroscopy, energy from light passing through a sample volume containing a gas or liquid sample is absorbed by the analyte, putting the absorbing atoms or molecules into an excited state
Implementation Method 3
The detector is positioned such that light emitted by the laser light source is detected by the at least one detector after passing through a sample gas
Data Source
AI summary
A method for implementation by a laser spectrometer is provided. The method includes first scanning, by a control unit using a first set of laser spectrometer operating parameters, a first wavelength range by adjusting a wavelength of light of a beam emitted by a laser light source and passing through a sample gas. The first wavelength range encompasses a first spectral feature corresponding to a first constituent. The method also includes at least one second scanning, by the control unit using a second set of laser spectrometer operating parameters, a second wavelength range by adjusting the wavelength of light emitted from the laser light source and passing through the sample gas. The second wavelength range has a second spectral feature corresponding to at least one second constituent. The control unit also determines a first concentration of the first constituent and a second concentration of the at least one second constituent.