Optical Resonant Cavity Layout for Higher CEAS Detector Light Output
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Solution Overview
Problem
The low light energy received by the photodetector in gas absorption spectrum detection devices based on CEAS technology limits the improvement of the signal-to-noise ratio and sensitivity.
Innovation Solution
An optical resonant cavity with specific reflection points, including input and output reflection points with higher transmittance than other reflection points, and optionally folding reflectors, to enhance light energy output to the photodetector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical path is increased by using CEAS technology with continuous reflection in the optical resonant cavity, then the gas absorption rate is improved and the detection lower limit is reduced, but the light energy received by the photodetector remains low which limits the improvement of the signal-to-noise ratio and sensitivity
Solution Approach 1:
The cavity mirror is divided into multiple reflection points, with at least one input reflection point and one output reflection point having different transmittance characteristics. This segmentation allows different regions of the mirror to serve different functions: input points facilitate light entry while output points optimize light extraction to the photodetector, resolving the contradiction between maintaining high absorption rate and delivering sufficient light energy to the detector
Solution Approach 2:
Different reflection points on the cavity mirror are assigned different transmittance values. The input reflection points have transmittance optimized for light coupling into the cavity, while output reflection points have transmittance optimized for delivering light to the photodetector. This local differentiation of optical properties allows the system to simultaneously achieve high gas absorption rate and sufficient light energy delivery, improving the signal-to-noise ratio and sensitivity
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 enhanced light energy output improves the signal-to-noise ratio and sensitivity of the gas absorption spectrum detection device.
Implementation Method 1
use the characteristics of continuous reflection of light in the optical resonant cavity to increase the effective optical path
Implementation Method 2
a photodetector, the photodetector is configured to measure a light intensity of the light beam transmitted through the output reflection point
Data Source
AI summary
An optical resonant cavity and a gas absorption spectrum detection device. The optical resonant cavity includes: a first cavity mirror and a second cavity mirror. The first cavity mirror includes multiple reflection points, and at least one of all the reflection points of the first cavity mirror is an input reflection point. A reflective surface of the second cavity mirror is arranged opposite to a reflective surface of the first cavity mirror, and the second cavity mirror and the first cavity mirror forms the optical resonant cavity. The second cavity mirror includes multiple reflection points, and at least one of the reflection points of the first cavity mirror or second cavity mirror is an output reflection point.