Photothermal Spectroscopy Offset Synchronous Testing
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Solution Overview
Problem
Current photothermal spectroscopy assay readers and lateral flow assays (LFAs) face limitations in detection sensitivity, particularly in early stages of infections where analyte concentrations are low, and are constrained by export control laws and high costs of high-frame rate thermal cameras.
Innovation Solution
A system and method utilizing a photothermal spectroscopy apparatus with a light source and assay reader synchronized at progressively offset time intervals, incorporating optically-absorbing indicator particles like gold nanoparticles, to enhance detection sensitivity by capturing thermal signals at ideal times, while being compliant with export controls and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-frame rate thermal cameras are used to capture thermal signals, then detection sensitivity is improved, but device cost and complexity increase
Solution Approach 1:
The patent applies periodic action by using a light source that emits light in periodic pulses rather than continuously. This allows the thermal camera to capture thermal signals at specific intervals corresponding to the light pulse frequency, enabling sensitive detection without requiring the camera to operate at continuously high frame rates. The periodic illumination creates periodic thermal responses that can be synchronized with the camera capture cycle.
Solution Approach 2:
The patent implements preliminary action by pre-synchronizing the light source pulses with the thermal camera capture timing. The system is configured beforehand to know when thermal signals will be generated (during light pulses) and when to capture them, allowing the camera to operate at lower frame rates while still capturing the critical thermal events. This timing coordination eliminates the need for continuously high-speed capture.
2Quantity of substance
If continuous light irradiation is used to generate thermal signals, then signal strength is improved, but heat accumulation and background noise increase
Solution Approach 1:
The patent uses periodic pulsed light irradiation instead of continuous illumination. The light source emits light in repeated cycles with on-periods and off-periods. During on-periods, thermal signals are generated; during off-periods, the system can cool down and background noise can subside. This periodic action maintains sufficient thermal signal strength while preventing excessive heat accumulation and reducing background thermal noise between pulses.
Solution Approach 2:
The patent segments the continuous light irradiation into discrete pulsed intervals. Rather than applying light continuously, the illumination is divided into separate pulses with gaps between them. This segmentation allows the thermal effects to be confined to specific time windows, enabling better control over heat accumulation and allowing the system to reset between measurements, thereby reducing background noise.
3Measurement precision
If thermal signals are captured at synchronized time intervals with light pulses, then detection precision is improved, but system complexity increases
Solution Approach 1:
The patent merges the light source control and thermal camera control into a unified synchronization system. Rather than treating them as separate systems requiring complex coordination, the invention integrates their timing control so that the light pulse generation and camera capture are inherently synchronized through a shared control mechanism. This reduces overall system complexity while maintaining precise timing alignment.
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 enables early detection of analytes with improved sensitivity and compliance with export regulations, allowing for reliable detection of low analyte concentrations and reducing the need for expensive high-frame rate cameras.
Implementation Method 1
The conjugate material reacted with analyte in the sample can absorb energy from the light. The photothermal spectroscopy assay reader can detect a thermal response from the irradiated conjugate material on the surface of the LFA
Implementation Method 2
A photothermal spectroscopy assay reader can detect radiation of heat from the surface of an LFA saturated with the sample of interest
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3A~3B
AI summary
Embodiments disclosed herein are directed to photothermal spectroscopy apparatuses and systems for offset synchronous testing of flow assays. Methods of using and operating such photothermal spectroscopy systems are also disclosed.