Tunable Laser Gas Analyzer Vibration Resilience
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Solution Overview
Problem
Conventional laser gas analyzers using tunable diode laser absorption spectroscopy (TDLAS) face issues with data collection due to vibrations, particularly when the frequency of the vibration source coincides with the natural frequency of the probe, leading to resonance and incomplete scanning signals, which prevents accurate measurement of gas density.
Innovation Solution
A spectroscopic analysis apparatus equipped with an acceleration sensor that detects probe vibrations, allowing the controller to adjust the scanning time to be equal to or shorter than half the light-receivable time, ensuring complete scanning signals are obtained despite vibrations, and incorporates noise suppression through signal integration and averaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the laser gas analyzer is mounted on the flue wall for stable installation, then the device structure is simplified and ease of operation is improved, but vibration from nearby devices (motors, fans) causes resonance when vibration frequency matches the natural frequency of the probe, leading to violent vibration and measurement failure
Solution Approach 1:
The patent applies dynamics by making the scanning time adjustable and adaptive rather than fixed. The system dynamically adjusts the scanning time based on detected vibration conditions, allowing it to adapt to changing environmental vibrations while maintaining stable installation on the flue wall. This resolves the contradiction by enabling the system to remain reliable under varying vibration conditions without requiring complex isolation structures.
Solution Approach 2:
The patent changes the parameter of scanning time from a fixed value to a variable that can be adjusted based on vibration detection. By monitoring vibration frequency and amplitude, the system modifies the scanning time parameter to ensure complete scanning signals are acquired even during resonant conditions, thereby maintaining measurement reliability while keeping the installation simple.
2Measurement precision
If the scanning time is extended to ensure complete scanning signals are acquired during vibration, then measurement accuracy is improved, but productivity decreases due to longer measurement cycles
Solution Approach 1:
The system dynamically adjusts scanning time based on real-time vibration detection rather than using a fixed extended scanning time. When vibration is detected, the scanning time is increased to ensure complete signals. When no vibration is present, the scanning time returns to normal duration, maintaining high productivity. This dynamic adaptation resolves the contradiction between measurement precision and productivity.
Solution Approach 2:
The patent implements feedback by using vibration sensors to detect vibration conditions and then adjusting the scanning time accordingly. The system continuously monitors vibration frequency and amplitude, and based on this feedback, modifies the scanning time to ensure complete scanning signals are acquired only when necessary, thereby maintaining both measurement precision and productivity.
3Reliability
If vibration damping structures are added to reduce probe vibration, then measurement reliability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent replaces mechanical vibration damping structures with a control system that uses sensors to detect vibration and adjusts the scanning time parameter accordingly. Instead of adding mechanical dampers or isolation structures, the system uses electronic control to adapt the scanning process to vibration conditions, thereby maintaining measurement reliability without increasing structural complexity.
Solution Approach 2:
Rather than modifying the physical structure to reduce vibration, the patent changes the operational parameter of scanning time to compensate for vibration effects. By adjusting the scanning time based on detected vibration conditions, the system ensures complete scanning signals are acquired without needing complex mechanical damping structures, thus maintaining simplicity while improving reliability.
4Productivity
If the laser scanning speed is increased to maintain productivity, then measurement speed is improved, but the likelihood of acquiring incomplete scanning signals during vibration increases, reducing measurement precision
Solution Approach 1:
The system dynamically adjusts the scanning speed (inverse of scanning time) based on vibration detection. During normal conditions, the laser scans at high speed to maintain productivity. When vibration is detected, the scanning time is extended to ensure complete signals are acquired. This dynamic adjustment resolves the contradiction between productivity and measurement precision.
Solution Approach 2:
The patent uses vibration sensor feedback to control the scanning speed. When vibration frequency and amplitude exceed thresholds, the system slows down the scanning speed by extending the scanning time to ensure complete signal acquisition. When vibration is absent, the system maintains high scanning speed for productivity. This feedback-based control resolves the contradiction between scanning speed and signal completeness.
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 reliable measurement of gas density even under resonant conditions by ensuring complete scanning signals are acquired and noise is minimized, thereby maintaining measurement accuracy.
Implementation Method 1
measures the intensity of the absorption spectrum
Implementation Method 2
absorbance is in proportion to a component density and the length of an optical path (Lambert Beer's law)
Implementation Method 3
an acceleration sensor that detects an acceleration of a vibration of the probe
Implementation Method 4
incorporates noise suppression through signal integration and averaging
Data Source
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AI summary
A spectroscopic analysis apparatus includes a laser light source (20) that emits laser light (L1), of which wavelength changes, toward a reflector (12) inside a probe (1), the probe (1) being configured to be disposed in a flow passage of a measurement target fluid, a light receiver (21) that receives the laser light reflected by the reflector (12), and a controller (22) that analyzes the measurement target fluid using a result of reception acquired by the light receiver (21) and controlling the laser light source (20). The controller (22) controls the laser light source (20) to perform at least one scan of the laser light, the controller (22) controlling the laser light source (20) such that a scanning time of the laser light is equal to or shorter than a light-receivable time, the scanning time being a time to scan the laser light emitted from the laser light source in a certain wavelength range, the light-receivable time being a time in which the laser light reflected by the reflector (12) can be received by the light receiver (21).