Mode-Locked Laser Transmitter for Simultaneous Multi-Gas Detection
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Solution Overview
Problem
Conventional remote sensing systems for detecting multiple gases in the atmosphere face challenges such as limited accuracy, poor data quality due to atmospheric interference, and the need for multiple sensors to detect different gases, which restricts rapid area coverage and increases complexity.
Innovation Solution
A remote sensing system utilizing mode-locked laser transmitters to generate multiple spectral channels within a single optical beam, allowing simultaneous detection of gases like methane and carbon dioxide with improved accuracy and reduced noise, enabling better dynamic range and ground spot resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional DIAL systems use multiple separate laser transmitters for different gases, then detection capability for multiple gases is achieved, but device complexity and the number of sensors required increases
Solution Approach 1:
The patent combines multiple laser transmitters into a single integrated sensor that can detect multiple gases simultaneously. The sensor uses a mode-locked laser to generate multiple spectral channels (online and offline wavelengths for different gases) within one beam, eliminating the need for separate sensors for each gas detection.
Solution Approach 2:
The single sensor is designed with multi-functionality to detect various gases (methane, carbon dioxide, and others) by utilizing multiple spectral channels. The same sensor platform can perform plume detection, background measurement, and compensation for different gas species through its ability to transmit and receive multiple wavelengths simultaneously.
2Productivity
If conventional systems use pulsed optical signals for rapid area coverage, then productivity is improved, but measurement precision and data quality deteriorate due to noise factors
Solution Approach 1:
The system uses mode-locked laser technology that generates periodic optical pulses with controlled timing. The periodic action of the mode-locked laser allows for rapid scanning across areas while maintaining consistent pulse characteristics that improve measurement precision through reduced noise factors compared to conventional pulsed systems.
3Measurement precision
If DIAL systems use differential measurement techniques to reduce noise factors, then measurement precision is improved, but the time required for measurement increases, reducing productivity
Solution Approach 1:
The system performs preliminary actions by pre-calculating and pre-positioning multiple spectral channels for different gases before measurement. The mode-locked laser generates all necessary wavelengths in advance, allowing the system to simultaneously measure multiple gases without the sequential time penalty of traditional differential measurement techniques.
4Device complexity
If conventional sensors transmit single wavelength beams, then device complexity is reduced, but adaptability to detect different gases simultaneously is limited
Solution Approach 1:
The patent segments the optical spectrum into multiple distinct channels (online and offline wavelengths) within a single beam. The mode-locked laser divides the overall spectral range into separate wavelength segments that can be simultaneously transmitted and received, enabling the detection of different gases at the same time without requiring multiple separate sensors.
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 enhanced detection accuracy and coverage rates, reducing the need for multiple sensors and improving measurement precision for both plume detection and background gas concentration, with increased integration time flexibility and reduced speckle noise.
Implementation Method 1
a mode locked laser based transmitter. For example, the present invention may simultaneously detect methane and carbon dioxide in the atmosphere
Implementation Method 2
One wavelength of one of the laser transmitters is tuned to an absorption wavelength of methane (for example) in the mid wave infrared part of the electromagnetic spectrum
Data Source
AI summary
A remote sensing system includes a transmitter for generating multiple beams of light; a combiner for combining the multiple beams of light and directing the combined multiple beams toward a target of multiple gases; and a receiver for receiving the combined multiple beams of light from the target. The first and second transmitted beams of light include, respectively, first and second sets of multiple distinct wavelengths that are simultaneously transmitted toward the target. The receiver receives the multiple distinct wavelengths, and simultaneously detects an intensity of each received wavelength. The first set of multiple distinct wavelengths is selected based on absorption characteristics of a first species of gas, and the second set of multiple distinct wavelengths is selected based on absorption characteristics of a second species of gas. The transmitter includes first and second mode-locked based lasers for generating, respectively, the first and second sets of distinct multiple wavelengths. The receiver includes first and second pixel arrays for detecting, respectively, the first and second sets of distinct multiple wavelengths.