Skip-Pulse Light Scattering Measurement for Ambient Light Rejection
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Solution Overview
Problem
Existing light scattering measurement devices face challenges in accurately detecting and measuring particles of interest while minimizing power consumption and manufacturing complexity, particularly when operating in chamberless or partial chamberless arrangements that are susceptible to ambient light interference.
Innovation Solution
The device employs a skip pulse pattern for light emission, combined with a processing circuit that reconstructs full samples from subsamples using sparse linear combinations of historical light scattering data, and performs demodulation and averaging to reduce interference and enhance sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous light emission is used for light scattering measurement, then measurement accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic pulsed light emission instead of continuous light emission. The light source emits light in periodic pulses with specific timing patterns, allowing the measurement system to capture light scattering signals at optimal moments while consuming less power during off-periods. This resolves the contradiction by providing sufficient measurement accuracy through periodic sampling while reducing overall power consumption compared to continuous operation.
Solution Approach 2:
The patent uses skip pulse patterns where light is emitted only during necessary measurement intervals rather than continuously. By applying partial action (emitting light only when needed for measurement) rather than excessive continuous emission, the system achieves required measurement accuracy while significantly reducing power consumption during non-measurement periods.
2Device complexity
If chamberless arrangement is used for light scattering measurement, then device complexity is reduced, but susceptibility to ambient light interference increases
Solution Approach 1:
The patent employs periodic pulsed light emission with specific timing patterns that create distinct temporal signatures for the light source. By synchronizing the light emission with the detection timing and using skip pulse patterns, the system can distinguish between pulses from the controlled light source and ambient light interference, maintaining measurement accuracy in chamberless arrangements without requiring complex physical shielding.
Solution Approach 2:
The patent implements a feedback mechanism where the processing circuit analyzes the timing and characteristics of received light signals to distinguish between signals from the controlled light source and ambient light interference. By using the known pulse timing patterns as a reference, the system can selectively process valid measurement signals while rejecting ambient light interference, resolving the contradiction between simplified chamberless structure and interference resistance.
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
This approach allows for accurate detection and measurement of particles in a chamberless environment by reducing power consumption and manufacturing complexity, while effectively filtering out ambient light interference.
Implementation Method 1
Light scattering can occur when light propagates through particles (e.g., smoke particles, blood cells, etc.) in a space and scattered by the particles in the space
Data Source
AI summary
In some examples, a method includes transmitting first light pulses according to a pre-determined pulse pattern in a first measurement period. The method also includes transmitting second light pulses according to the pre-determined pulse pattern in a second measurement period consecutive to the first measurement period, in which at least some of the first and second light pulses being unequally spaced in time across the first and second measurement periods. The method also includes receiving first detection signals representing detection of the first light pulses. The method also includes receiving second detection signals representing detection of the second light pulses. The method also includes providing a first light scattering measurement signal representing the first measurement period responsive to the first detection signals. The method also includes providing a second light scattering measurement signal representing the second measurement period responsive to the second detection signals.