Compact Optical Gas Detection Using Elliptical Mirrors
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Solution Overview
Problem
Existing gas detection systems are bulky, power-intensive, and inefficient, making them unsuitable for widespread deployment as portable, distributed sensors for gases like CO2, NOx, and water vapor, which are crucial for human health, environmental monitoring, and energy savings.
Innovation Solution
A compact, low-power optical gas detection system utilizing elliptical mirror surfaces inclined at 45 degrees to enhance light collection efficiency, combined with a substrate-mounted LED light source and detectors, allowing for simultaneous measurement of multiple gases with reduced size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a broadband light source with long optical path is used, then gas detection capability is improved, but device size and power consumption increase
Solution Approach 1:
The patent employs elliptical mirror surfaces instead of flat or simple curved mirrors. The elliptical geometry allows light to travel a extended optical path while confined within a compact volume. The mirrors are positioned at specific orientations to maximize light collection efficiency and maintain a compact device footprint, directly resolving the contradiction between measurement precision and device volume.
Solution Approach 2:
The patent transitions from a simple linear optical path to a three-dimensional optical path using elliptical mirrors. By utilizing the third dimension (depth/z-axis) through the elliptical mirror geometry, the light path is extended without proportionally increasing the device footprint in the x-y plane, thereby improving measurement capability while controlling device size.
2Measurement precision
If a broadband light source with long optical path is used, then gas detection capability is improved, but power consumption increases
Solution Approach 1:
The elliptical mirror geometry enables extended optical path length within a compact volume, reducing the required light source power. The mirrors are positioned to maximize light collection efficiency, ensuring that a smaller portion of the emitted light is wasted, thereby reducing the power consumption needed to achieve sufficient signal strength for accurate gas detection.
Solution Approach 2:
The patent optimizes the optical path length and light collection efficiency parameters to achieve high measurement precision with reduced power consumption. By carefully selecting the elliptical mirror dimensions, orientations, and positions, the system maximizes the product of path length and collection efficiency, allowing lower power operation while maintaining detection sensitivity.
3Ease of manufacture
If conventional optical components are used, then manufacturing simplicity is maintained, but light collection efficiency decreases
Solution Approach 1:
The patent uses elliptical mirror surfaces that can be manufactured using standard optical machining techniques. The mirrors are designed with specific eccentricities and orientations that optimize light collection. By using conventional manufacturing methods for creating curved optical surfaces, the patent achieves high light collection efficiency without requiring complex or expensive manufacturing processes.
Solution Approach 2:
The patent optimizes the geometric parameters of the elliptical mirrors (eccentricity, size, orientation) to maximize light collection efficiency. These parameter optimizations are achieved through careful design that remains compatible with standard manufacturing capabilities, balancing manufacturing simplicity with high optical efficiency.
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 low power consumption, enabling widespread deployment of portable gas sensors with improved accuracy and efficiency, capable of detecting gases like CO2 and water vapor with sensitivity better than 50 ppm, suitable for battery-operated devices.
Implementation Method 1
elliptical mirror surfaces inclined at 45 degrees to enhance light collection efficiency
Implementation Method 2
The gas in the sample chamber causes absorption of specific wavelengths according to the Beer-Lambert law, and the attenuation of these wavelengths is measured by the detector to determine the gas concentration
Implementation Method 3
a substrate with a light source disposed on it
Data Source
AI summary
System and apparatus for portable gas detection. Specifically, this disclosure describes apparatuses and systems for optical gas detection in a compact package. There is a need for a very compact, low-power, gas detection system for gases such as CO2, NOx, water vapor, methane etc. This disclosure provides an ultra-compact and highly efficient optical measurement system based on principals of optical absorption spectroscopy. It reduces the size of the instrument as well its power consumption by more than an order of magnitude making it possible to deploy it widely. There is an identified need for large number of distributed gas sensors to improve human health, environment, and save energy usage.