Removable Test Cell Fluid Analyzer for Trace Liquid Quantitation
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Solution Overview
Problem
Existing infrared spectroscopy systems face challenges in accurately analyzing trace components in liquids due to strong background absorptions, limited path lengths, and poor measurement repeatability, especially in Fourier transform infrared (FTIR) spectrometers, which are not suitable for quantitative liquid spectroscopy or trace detection.
Innovation Solution
A fluid analyzer with a modular test cell design that includes a laser assembly, signal detector assembly, and a coupler assembly for aligning and securing the test cell module to the analyzer frame, allowing for tunable laser beams and adjustable gain detection, along with a self-check mechanism to ensure performance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If FTIR spectrometers use broadband globar incandescent source, then the system can provide broad spectral coverage, but the optical power per wavelength is low resulting in small path lengths and poor sensitivity for trace detection
Solution Approach 1:
The patent replaces the traditional broadband globar incandescent source with a laser source that provides high optical power at specific wavelengths. This substitution of the light source mechanism enables long path lengths through liquids while maintaining high sensitivity for trace detection, resolving the contradiction between spectral coverage and measurement precision.
Solution Approach 2:
The patent changes the fundamental parameter of the light source from broadband low-power incandescent to narrowband high-power laser. This parameter change enables the system to achieve both adequate spectral coverage at target wavelengths and the high optical power necessary for long path lengths and trace component detection.
2Length of stationary object
If ATR interfaces are used to increase path length, then liquid analysis capability is improved, but the spectral signatures are distorted due to combined absorption and refractive index effects
Solution Approach 1:
The patent extracts the light source from the ATR interface configuration and uses direct transmission through the liquid sample. By removing the ATR crystal and its associated refraction/absorption complications, the system achieves long path lengths without spectral distortion, maintaining accurate spectral signatures while enabling sensitive trace detection.
3Length of stationary object
If ATR technique is used for liquid spectroscopy, then path length is increased, but measurement repeatability becomes poor due to sensitivity to angle of incidence
Solution Approach 1:
The patent replaces the ATR optical configuration with direct transmission geometry using laser beams. This substitution eliminates the angle-of-incidence sensitivity inherent in ATR techniques, providing superior measurement repeatability and reliability while maintaining adequate path lengths for trace detection.
4Measurement precision
If long path lengths are used to detect trace components, then sensitivity for trace detection is improved, but background absorption from the liquid becomes too strong causing light attenuation to unacceptably low values
Solution Approach 1:
The patent changes the light source parameter from low-power broadband to high-power narrowband laser. This enables the system to use long path lengths for trace detection while the high optical power compensates for background absorption, maintaining adequate signal levels at the detector.
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 identification and quantification of trace components in liquids with improved sensitivity and repeatability, overcoming the limitations of traditional FTIR spectroscopy systems.
Implementation Method 1
a laser assembly that generates a laser beam that is directed through the test cell assembly
Implementation Method 2
Different liquid or dissolved chemicals have strong identifying absorption features in the infrared wavelengths
Data Source
AI summary
A fluid analyzer (214) that analyzes a sample (12) includes (i) an analyzer frame (236); (ii) a module (216) that includes a test cell assembly (242) that receives the sample (12) and a module frame (244) that retains the test cell assembly (242); (iii) a laser assembly (238) that generates a laser beam (239A) that is directed through the test cell assembly (242), the laser assembly (238) being coupled to the analyzer frame (236); (iv) a signal detector assembly (232) that collects a test signal light (239B) transmitted through the test cell assembly (242), the signal detector assembly (232) being coupled to the analyzer frame (236); and (v) a coupler assembly (245) that selectively couples the module frame (244) to the analyzer frame (236).