Optical Measurement Offset Compensation Using a Reference Detector
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Solution Overview
Problem
Existing optical measurement systems face challenges in removing or reducing absorption offsets due to gas absorption in ambient air, which requires constant recalibration and is impractical in environments where dry nitrogen is not available, complicating device operation and design.
Innovation Solution
A method and device that utilize a reference detector to rescale light signals by measuring and applying scaling factors to compensate for absorption offsets, eliminating the need for continuous recalibration and dry nitrogen flushing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dry nitrogen flushing is used to remove absorption offset, then measurement accuracy is improved, but device complexity and operational requirements increase
Solution Approach 1:
A reference detector is introduced as an intermediary component that measures the absorption offset caused by ambient air in the housing. This reference detector acts as a mediator between the light source and the measurement detector, providing a signal that represents the offset without requiring physical modification of the measurement environment or additional complex flushing mechanisms.
Solution Approach 2:
The system implements feedback by continuously monitoring the absorption offset through the reference detector and using this information to correct the measurement detector's readings. The offset signal from the reference detector is subtracted from the measurement detector signal, creating a closed-loop system that automatically compensates for environmental variations without manual intervention.
2Measurement precision
If dry nitrogen flushing is used to remove absorption offset, then measurement accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The system performs self-service by automatically compensating for absorption offsets using the reference detector. The device autonomously measures the offset, calculates the correction, and applies it to the measurement detector signal without requiring user intervention for calibration or flushing operations, making it easy to operate regardless of user expertise.
3Measurement precision
If reference measurements at the site are performed, then measurement accuracy is improved, but measurement time increases
Solution Approach 1:
The reference detector continuously measures the absorption offset in advance and in parallel with the measurement detector. By performing the reference measurement simultaneously and preliminarily, the system eliminates the need for sequential reference measurements, thereby maintaining high measurement accuracy without increasing measurement time.
4Object-affected harmful factors
If beam preparation compartment is flushed with dry nitrogen, then absorption offset is reduced, but loss of substance increases
Solution Approach 1:
The reference detector serves as an intermediary that measures the absorption offset without requiring physical removal of the absorbing medium (ambient air). This approach eliminates the need to consume dry nitrogen for flushing while still achieving offset compensation through optical measurement and signal processing.
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
Simplifies device operation, reduces the need for training, and allows for a simpler design by compensating for absorption offsets using a reference detector, enabling accurate gas concentration measurements without constant recalibration.
Implementation Method 1
the two laser beams will suffer gas absorption of oxygen molecules and water vapor in this environment, which is regarded as an absorption offset to the measurement
Implementation Method 2
the amount of absorption due to each gas species gives a measurement of the concentration of gas integrated over an optical pathlength the light is transmitted in the gas
Data Source
AI summary
A device and method for rescaling a signal to remove an absorption offset from an optical measurement. During a first mode a scaling factor is obtained from measurements on a reference object which is then applied during a second mode when measuring on a measurement object.