Solid-State Gas Spectrometer Differential Detection
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Solution Overview
Problem
Existing gas spectrometers face challenges in providing high selectivity, sensitivity, and reliability for monitoring respiratory gases like CO2, especially in real-time and mainstream applications, while also being cost-effective and compact.
Innovation Solution
A non-dispersive solid-state gas spectrometer that uses a differential sensing scheme without moving parts, employing a light emitter, collimator, airway adapter, and focusing beam splitter to divide and focus light beams on light detectors, allowing for real-time monitoring of CO2 levels in exhaled and inhaled air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional dispersive elements (prisms, diffraction gratings) are used to separate broadband light into wavelength bands, then wavelength separation capability is improved, but device complexity and size increase
Solution Approach 1:
The patent removes dispersive elements (prisms, diffraction gratings) from the optical path and extracts only the necessary function of wavelength-selective detection using filters positioned directly at the detector. This eliminates complex beam manipulation components while maintaining the ability to measure specific wavelength bands associated with target gas absorption.
Solution Approach 2:
The patent replaces mechanical/optical dispersive systems with a filter-based detection system. Instead of using physical dispersion to separate wavelengths spatially, the invention uses spectral filters to selectively transmit specific wavelength bands to detectors, substituting a simpler optical filtering mechanism for complex mechanical/optical dispersion apparatus.
2Reliability
If NDIR spectroscopy is used for respiratory gas monitoring, then selectivity and reliability are improved, but sensitivity and detection limit may be insufficient for certain applications
Solution Approach 1:
The patent applies local quality by positioning specific spectral filters at different locations in the optical path or using multiple detectors with different filter characteristics. Each detector is optimized for specific wavelength bands, allowing the system to simultaneously monitor multiple gas species with high sensitivity while maintaining the reliability of NDIR spectroscopy for each individual measurement.
3Volume of moving object
If compact design is implemented for portable respiratory monitoring, then portability and ease of use are improved, but optical path length and sensing volume are reduced
Solution Approach 1:
The patent merges the functions of light source, sample interaction chamber, and detector into a highly integrated compact assembly. By combining these components in a space-efficient configuration and using direct filter-to-detector coupling, the system achieves adequate optical path length for reliable gas detection while maintaining a small form factor suitable for portable respiratory monitoring applications.
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 system achieves high sensitivity and accuracy in monitoring CO2 levels with low power consumption and in a compact form, suitable for real-time respiratory gas analysis in medical and non-medical applications.
Implementation Method 1
spectroscopic techniques that use the unique spectral fingerprints of gas molecules for measuring their concentration, are known for their selectivity... each gas molecule absorbs light at specific and unique set of wavelength bands
Implementation Method 2
by monitoring the variation of electromagnetic power transmitted through a gas sample, within the absorption wavelength band of a target gas molecule, the concentration of the target gas molecules in the gas sample can be determined
Data Source
AI summary
A solid-state gas spectrometer for detection of molecules of target gases. An emitter generates light having wavelengths both within and outside of one or more absorption bands of a target molecule. The light provided by the emitter passes through an airway adapter. A reflective beam splitter splits the light transmitted through the airway adapter, into two convergent beams each focused on a light detector. One of the light detectors, which is covered by a filter that rejects light having wavelengths within one or more absorption bands of the target molecule, serves as the sensing detector. The other light detector, which may or may not be covered by a filter, serves as the reference detector. The concentration of a target gas molecule in the gas sample is estimated based on a differential signal that is generated using the signals received from the reference and sensing detectors.