PMT Gain Calibration for Stable Fluorescence Measurement
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Solution Overview
Problem
Existing optical imaging systems face challenges in maintaining consistent detector performance, particularly photomultiplier tube (PMT) gain stability due to factors like lifespan degradation, input light intensity, and environmental conditions, leading to inaccurate fluorescence measurements.
Innovation Solution
An optical system with processors that control detector gain and perform calibrations, using interference optical systems, detectors, and processors to maintain consistent measurement accuracy by adjusting sensitivity and calibrating PMTs through fluorescence calibration and background signal analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detector gain is increased to improve measurement sensitivity, then measurement precision is improved, but detector performance stability deteriorates over time due to lifespan degradation and environmental factors
Solution Approach 1:
The system performs preliminary calibration actions at defined intervals or when specific conditions are met (e.g., catheter disconnection/detection). The processor automatically initiates calibration sequences that adjust PMT gain settings before measurements are taken, ensuring optimal performance without manual intervention. This preliminary adjustment compensates for cumulative degradation effects.
Solution Approach 2:
The system implements feedback mechanisms where the processor continuously monitors detector performance metrics and automatically adjusts gain settings based on observed deviations. Calibration data from previous measurements feeds into subsequent gain control decisions, creating a closed-loop system that maintains stability despite environmental variations and aging effects.
2Measurement precision
If manual calibration procedures are implemented to maintain detector performance, then measurement precision is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The system performs self-calibration automatically without requiring manual user intervention. The processor monitors system state and autonomously executes calibration routines, adjusting detector gain settings based on pre-programmed algorithms. This self-service capability eliminates the need for complex manual calibration procedures while maintaining measurement precision.
Solution Approach 2:
The calibration system is integrated into the existing processor and control architecture, serving multiple functions including performance monitoring, automatic adjustment, and quality control. This multi-functionality approach avoids adding separate dedicated calibration hardware, thereby limiting complexity increases while achieving improved detector performance consistency.
3Reliability
If frequent calibrations are performed to maintain gain stability, then reliability is improved, but loss of time and productivity decrease
Solution Approach 1:
The system implements periodic calibration at optimized intervals rather than continuously or manually after every measurement. The processor determines calibration timing based on usage patterns, environmental conditions, and detector performance trends. This periodic approach maintains gain stability while minimizing interruptions to measurement workflows and maximizing productivity.
Solution Approach 2:
The system performs rapid calibration sequences that minimize the time required for gain stabilization. When calibration is triggered, the processor executes streamlined adjustment routines that reach stable operating conditions faster than traditional methods. This rushing through the calibration process reduces time loss while still achieving reliable gain stability.
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
Ensures reliable and consistent fluorescence measurements by stabilizing PMT gain, reducing the need for additional components like optical switches, and minimizing maintenance costs.
Implementation Method 1
Both beams combine (or are recombined) at the splitter and generate interference patterns
Implementation Method 2
The output of the interferometer is detected with one or more detectors, such as, but not limited to, photodiodes or multi-array cameras
Data Source
AI summary
One or more devices, systems, methods, and storage mediums for performing imaging, for performing measurement(s), and/or for performing or controlling detector gain or photomultiplier tube gain using one or more imaging modalities are provided herein. Examples of applications include imaging, evaluating and diagnosing biological objects, such as, but not limited to, for Gastro-intestinal, cardio and/or ophthalmic applications, and being obtained via one or more optical instruments, such as, but not limited to, optical probes, catheters, capsules and needles (e.g., a biopsy needle). Devices, systems, methods, and storage mediums may include or involve a method, such as, but not limited to, for performing measurement(s) and/or controlling detector gain or photomultiplier gain, and may include or involve one or more imaging modalities, such as Optical Coherence Tomography and Fluorescence.