Integrated Gas Cell Pressure Sensing for Compact Infrared Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gas analysis apparatuses using infrared absorption spectroscopy face challenges in accurately measuring gas component concentrations due to the increased size caused by separate temperature control mechanisms for pressure sensors, which are necessary to compensate for diaphragm deformation with temperature changes.
Innovation Solution
Integrating the pressure sensor into the temperature control block and/or gas cell, allowing temperature control of the sensor without a separate mechanism, thereby reducing the apparatus size and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a separate temperature control mechanism is provided for the pressure sensor, then the temperature of the pressure sensor can be controlled accurately, but the size of the gas analysis apparatus becomes increased
Solution Approach 1:
The pressure sensor is integrated into the gas cell structure, and the temperature control mechanism that was originally designed for the gas cell is extended to also control the pressure sensor temperature. This merging of functions eliminates the need for a separate temperature control mechanism for the pressure sensor, thereby reducing the overall apparatus size while maintaining accurate temperature control for both components
Solution Approach 2:
The temperature control mechanism is designed to serve dual purposes: controlling the temperature of the gas cell and controlling the temperature of the pressure sensor simultaneously. This multi-functional approach allows a single mechanism to address multiple temperature control needs, reducing the number of components and overall apparatus size
2Ease of operation
If the pressure sensor is installed away from the optical path, then the sensor can be positioned for easy access, but the distance between the optical path and pressure detection position increases causing deviation in response time
Solution Approach 1:
The pressure sensor is nested within the gas cell structure in such a way that it is positioned close to the optical path for accurate pressure measurement, while still allowing access through the flange member interface. The sensor body is integrated into the gas cell wall, creating a compact nested arrangement that optimizes both measurement accuracy and accessibility
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
This configuration enables precise pressure measurement, reduces thermal distribution, and enhances concentration measurement accuracy by minimizing the distance between the optical path and pressure detection point, thus improving overall measurement precision.
Implementation Method 1
because the diaphragm deforms with temperature, too, in order to measure the pressure accurately, it is necessary to control the temperature of the sensor body uniformly
Implementation Method 2
The capacitive pressure sensor includes a diaphragm that deforms with pressure and a fixed electrode that is provided in a manner facing the diaphragm, and is configured to convert the capacitance generated between the diaphragm and the fixed electrode into pressure
Implementation Method 3
In a gas analysis apparatus that uses infrared absorption spectroscopy to measure a component of a gas
Data Source
AI summary
Provided are a gas cell into which a gas is introduced, a temperature control block configured to control a temperature of the gas cell, and a pressure sensor configured to measure a pressure inside the gas cell. The pressure sensor is built into the temperature control block and/or the gas cell.