Multi-Resonator Gas Sensing with One Gain Medium
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Solution Overview
Problem
Conventional gas sensors require multiple expensive lasers to determine various types of gases, leading to increased size and cost.
Innovation Solution
A gas sensor utilizing a single gain medium and multiple resonators with different lengths to generate multiple laser beams of different wavelengths, which interfere with a determination-target gas for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple lasers with different oscillation wavelengths are used to determine various gas types, then the gas sensor can identify multiple gas types, but the device size increases and cost increases
Solution Approach 1:
The patent combines multiple laser sources into a single broadband light source that emits across a wide spectral range. This single light source replaces what would traditionally require multiple separate lasers, thereby reducing device size while maintaining the capability to detect multiple gas types through their respective absorption spectra
Solution Approach 2:
The broadband light source serves multiple functions simultaneously by providing the spectral coverage needed to detect various gas types. Instead of requiring dedicated lasers for each gas type, the universal broadband source enables detection of multiple gases through a single optical path and detection system
2Adaptability or versatility
If multiple lasers with different oscillation wavelengths are used to determine various gas types, then the gas sensor can identify multiple gas types, but the cost increases
Solution Approach 1:
The patent merges multiple expensive laser components into a single broadband light source, significantly reducing the bill of materials cost. This consolidation eliminates the need to purchase, maintain, and align multiple precision laser devices, thereby reducing both initial manufacturing cost and operational cost
Solution Approach 2:
The patent employs a broadband light source that is less expensive and more readily available than multiple precision lasers. This approach trades the high cost and long lifetime of multiple lasers for a lower-cost, more manufacturable light source solution
3Volume of moving object
If a single gain medium is used with multiple resonators to generate multiple wavelengths, then the device size is reduced, but the system complexity increases
Solution Approach 1:
The patent uses tunable resonators that can dynamically adjust their resonant frequencies to select different wavelength components from the broadband light source. This dynamic tuning capability allows a single resonator system to perform the function of multiple fixed-wavelength resonators, reducing overall system complexity while maintaining multi-wavelength capability
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 approach allows for compact and cost-effective gas detection by using a single expensive gain medium and components, enabling identification of multiple gas types with reduced size and cost.
Implementation Method 1
one gain medium; a plurality of resonators having different resonator lengths and simultaneously generating a plurality of laser beams having different wavelengths from light emitted from the gain medium
Implementation Method 2
Gas molecules have photo-absorption spectra at specific wavelengths. Therefore, the determination of the type of gas has been made by causing the gas to interfere with a laser beam that exhibits a sharp spectrum having a narrow linewidth and detecting absorption of the laser beam into the gas
Data Source
AI summary
A plurality of resonators (4a,4b,4c) having different resonator lengths simultaneously generate a plurality of laser beams having different wavelengths from light emitted from one gain medium (3). A light-receiving device (9a,9b,9c) detects the plurality of laser beams. The plurality of laser beams are caused to interfere with a determination-target gas (10) inside the plurality of resonators (4a,4b,4c).