Optical Alignment Compensation via Transceiver Selection for Gas Detection
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Solution Overview
Problem
Gas detection systems in remote natural gas production facilities face misalignment issues due to environmental changes, leading to temporary loss of functionality and high operational costs, especially when using motorized gimbaling mirrors.
Innovation Solution
An optical alignment compensation system with an array of transceiver pairs, a retroreflector, and a control unit that electronically selects the transceiver pair with the highest signal response to maintain alignment, eliminating the need for external beam alignment components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If motorized gimbaling mirrors are used to compensate misalignment, then alignment accuracy is improved, but device complexity and maintenance costs increase
Solution Approach 1:
The system segments the alignment compensation function into multiple static transceiver pairs with different beam directions. Instead of one complex moving mirror, multiple simple transceiver pairs cover different angular ranges, eliminating mechanical complexity while maintaining alignment capability.
Solution Approach 2:
The patent replaces the mechanical gimbaling mirror system with an electronic selection system. The control unit electronically switches between static transceiver pairs based on retroreflector position, substituting mechanical movement with electronic control and optical switching.
2Reliability
If manual re-alignment is performed to correct misalignment, then alignment is restored, but loss of time and operational costs increase
Solution Approach 1:
The system performs self-alignment compensation by automatically detecting retroreflector position deviations and switching between transceiver pairs. The alignment compensation function is built-in and operates autonomously without requiring external manual intervention or specialized personnel.
Solution Approach 2:
The system uses feedback from the detected signal strength to determine retroreflector alignment status. When misalignment is detected through signal quality monitoring, the control unit automatically switches to the appropriate transceiver pair to restore optimal alignment.
3Device complexity
If transceiver pairs are integrated on an optical chip, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent merges multiple transceiver pairs and their optical components onto a single optical chip. This integration consolidates what would be separate discrete components into one unified device, reducing overall system complexity while the chip fabrication process handles the precision requirements.
Solution Approach 2:
The optical chip serves multiple functions: it houses multiple transceiver pairs with different beam directions, provides optical switching capabilities, and enables alignment compensation all in one integrated component. This multi-functionality reduces the need for separate alignment mechanisms.
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 compensates for misalignments, increases the range of retroreflector positions with accurate gas concentration estimation, reduces unit, installation, and maintenance costs, and simplifies alignment procedures.
Implementation Method 1
a retroreflector arranged at a nominal position and configured to reflect the light
Implementation Method 2
an optical element arranged and configured to direct the light from at least one of the transceiver pairs along an optical path through the gas to the retroreflector
Implementation Method 3
transceiver pairs, wherein each transceiver pair is configured to transmit and receive light with an optical spectrum in an absorption region of a gas to be detected
Data Source
AI summary
The present disclosure relates to an optical alignment compensation system for a gas detection system, in particular, to an integrated alignment compensation system for an open-path gas sensing system. The optical alignment compensation system of the disclosure is able to compensate for unwanted drifts of a retroreflector. The optical alignment system comprises an array of transceiver pairs, wherein each transceiver pair is configured to transmit and receive light with an optical spectrum in an absorption region of a gas to be detected. Further, it comprises a retroreflector arranged at a nominal position and configured to reflect the light. Further, it comprises an optical element arranged and configured to direct the light from at least one of the transceiver pairs along an optical path through the gas to the retroreflector, to receive the light reflected by the retroreflector along the optical path, and to direct the reflected light to the respective transceiver pair. Further, it comprises a control unit configured to select one of the transceiver pairs for transmitting and receiving the light, wherein the control unit is configured to select the transceiver pair that receives the reflected light with the highest signal response.