Reflective Optical Element for Compact Infrared Gas Sensing
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Solution Overview
Problem
Existing gas monitoring devices face challenges in miniaturization and efficient detection of gases due to complex optical systems and large reflective surfaces, limiting their application in compact and flexible setups.
Innovation Solution
A sensing system utilizing a reflective optical element with a planar quantum cascade device that functions as both a light source and photodetector, combined with a reflective optical element featuring an array of small triangular pyramids, allows for precise gas detection by controlling voltage to switch between emission and detection modes, reducing system size and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional optical system with separate light source and detector is used, then gas detection functionality is achieved, but device complexity and size increase
Solution Approach 1:
The patent combines the light source and photodetector functions into a single quantum cascade device. This device can operate in two modes: emitting infrared light when forward-biased and detecting infrared light when reverse-biased. This merging eliminates the need for separate light source and detector components, thereby reducing device complexity while maintaining gas detection functionality
Solution Approach 2:
The quantum cascade device serves multiple functions: it acts as both a light source for infrared emission and a photodetector for infrared detection. By applying different voltage polarities, the same device performs different operations, making the optical system more universal and reducing the number of components needed
2Reliability
If a large reflective surface is used, then light reflection efficiency is improved, but device size increases
Solution Approach 1:
The patent uses a curved reflective surface instead of a flat one. The curvature of the reflective surface helps to focus and redirect infrared light efficiently back toward the quantum cascade device, maintaining good reflection efficiency while allowing for a more compact overall device design
Solution Approach 2:
The reflective surface is positioned and oriented in a specific spatial arrangement relative to the quantum cascade device. By optimizing the three-dimensional geometry and positioning of the reflective surface, the system achieves efficient light reflection without requiring a large surface area, thus reducing device volume
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 compact and efficient gas detection with high accuracy and flexibility, enabling miniaturized setups for various applications, including gas safety inspections and rapid monitoring in diverse environments.
Implementation Method 1
The optical device is configured to emit infrared rays from the element face in the first operation
Implementation Method 2
The optical device is configured to detect the infrared rays reflected by the reflective optical element and incident on the element face in the second operation
Implementation Method 3
detect the infrared rays reflected by the reflective optical element
Data Source
AI summary
According to one embodiment, a sensing system includes a reflective optical element, and an optical device. The reflective optical element includes a plurality of optical structures arranged along a first plane. The optical device includes an element face. The optical device is configured to perform a first operation and a second operation. The optical device is configured to emit infrared rays from the element face in the first operation. The optical device is configured to detect the infrared rays reflected by the reflective optical element and incident on the element face in the second operation.