Tubular Spectroscopy Cell with Parallel Tubes for Benzene Detection
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Solution Overview
Problem
Existing spectroscopy devices for analyzing chemically contaminated carbon dioxide face challenges in achieving high reproducibility, low cost, and simple applicability while maintaining measurement accuracy, especially in detecting small amounts of benzene and methane, due to environmental influences and high noise levels.
Innovation Solution
A spectroscopy device with a stabilized tubular measuring cell, where the measuring cell is rigidly connected to parallel tubes made of materials with a similar thermal expansion coefficient to glass, reducing vibration-induced noise and increasing absorption coefficients, combined with a compact design and thermoregulation for accurate benzene detection, using a xenon light source and high-resolution detectors for enhanced signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If highly sensitive measuring instruments are used to detect minute quantities of gas with required accuracy, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The measuring device is segmented into a compact integrated unit combining the light source, measuring cell, and detector in a single housing. This modular segmentation allows high-precision measurement capabilities while reducing overall system complexity and facilitating easier deployment compared to distributed complex instrument setups.
2Measurement precision
If a sufficiently long transmission path is used to achieve signal strength above noise threshold, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The optical components are nested within the tubular measuring cell structure, with the light source, mirrors, and detector arranged concentrically along the transmission path. This nesting approach achieves a long effective transmission path (2 meters) within a compact form factor, maintaining high measurement precision while minimizing device complexity and spatial requirements.
Solution Approach 2:
The optical path is folded back on itself using mirrors arranged at 45-degree angles, transforming a linear transmission path into a multi-dimensional zigzag configuration within the tube. This allows achieving a 2-meter optical path length within a compact 10 cm x 10 cm x 30 cm housing, resolving the contradiction between long transmission path and simple device structure.
3Measurement precision
If rigid connections are used to stabilize the measuring cell against environmental influences, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The connecting elements are designed with adjustable positioning mechanisms that allow fine-tuning of the optical alignment after assembly. This parameter adjustment capability compensates for manufacturing tolerances in the rigid connections, ensuring stable mechanical coupling and consistent optical alignment without requiring extremely tight manufacturing precision.
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 provides high reproducibility and accuracy in detecting benzene at low concentrations with reduced noise and cost-effective production, enabling reliable monitoring of chemically contaminated carbon dioxide, even in varying temperature conditions.
Implementation Method 1
The tube is rigidly connected to parallel tubes (3a, 3b) by means of connecting elements (4a, 4b), each fixed circumferentially and completely encompassing the circumference of the tube, for stabilizing the measuring cell against environmental influences
Implementation Method 2
the tubes arranged parallel to the measuring cell's direction of extension are made of a material with a coefficient of thermal expansion equal to or smaller than that of glass
Implementation Method 3
Absorption spectroscopy is an important tool for trace analysis, i.e., the determination of minute quantities of a substance alongside larger quantities of its main components
Implementation Method 4
The fundamental principle of the present invention is therefore the damping of vibrations induced by environmental influences and their rapid decay due to the increased inertia of the resonating body
Data Source
Figure 1
AI summary
The device (1) has a tubular measuring cell (2) with pipes (3a, 3b) that are arranged in parallel to extending direction of the measuring cell. The pipes have a rigid connection, and are formed of a material such as glass, having smaller or equal thermal expansion coefficient. A light source (6) e.g. deuterium lamp, radiates light within ultraviolet (UV) range, where uncoupled light radiation is fed into a detector/spectrometer (7). An independent claim is also included for a method for spectroscopy with a tubular measuring cell.