Integrated Semiconductor Particle Detector Using Parallel Optical Detection
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Solution Overview
Problem
Existing particle detectors face challenges with long measurement times, high costs, cumbersome designs, and reduced efficiency when detecting particles at low concentrations, particularly for particulate matter and alpha particles.
Innovation Solution
An integrated semiconductor-based detection device that includes a gas pump to concentrate particles within a detection area, where they are hit by a light source causing light scattering, which is then detected by a photodetector, allowing for the calculation of particle size distribution using Mie scattering algorithms and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If particles are detected one by one using a laser beam and photodiode, then measurement precision is improved, but measurement time increases significantly
Solution Approach 1:
The patent replaces the mechanical scanning approach (moving laser beam through space to detect particles sequentially) with a parallel detection system using a camera sensor that captures all particles simultaneously in a field of view. This substitution of mechanical sequential detection with optical parallel detection resolves the contradiction by maintaining precision through image analysis while dramatically reducing measurement time.
Solution Approach 2:
The patent transitions from one-dimensional sequential detection (single photodiode detecting particles along a linear path) to two-dimensional parallel detection (camera sensor detecting particles across a planar field). This dimensional expansion allows multiple particles to be detected simultaneously, resolving the time-prediction contradiction.
2Measurement precision
If discrete components are used for particle detection, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges multiple discrete components (light source, detection sensor, and processing unit) into an integrated system where a camera sensor simultaneously performs both detection and imaging functions. The camera replaces the separate laser-photodiode arrangement, and integrated circuits process images directly, reducing overall system complexity while maintaining detection precision.
Solution Approach 2:
The camera sensor serves multiple functions simultaneously: it acts as both the detection element and the imaging device, eliminating the need for separate photodiodes and optical scanning mechanisms. This multi-functionality reduces component count and system complexity while preserving measurement precision through digital image analysis.
3Reliability
If high laser power is used to detect low concentration particles, then detection sensitivity is improved, but energy consumption increases
Solution Approach 1:
The patent replaces high-power continuous laser illumination with lower-power pulsed laser illumination synchronized with camera exposure, or alternatively uses ambient light conditions. The camera's high sensitivity allows detection with reduced illumination power, resolving the contradiction between detection sensitivity and energy consumption.
Solution Approach 2:
The patent employs periodic pulsed illumination instead of continuous high-power laser operation. The laser emits short pulses synchronized with camera exposure times, providing sufficient light for detection only when needed. This periodic action maintains detection sensitivity for low-concentration particles while dramatically reducing average power consumption compared to continuous illumination.
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 solution enhances detection efficiency, sensitivity, and reduces measurement times while maintaining small dimensions and low costs, effectively addressing the limitations of current detectors.
Implementation Method 1
a gas pump that accelerates a gas, such as air, and particles contained therein, concentrating them in a body cavity forming a detection area
Implementation Method 2
the particles are hit by light emitted by a light source to cause light scattering, which is detected via a photodetector
Implementation Method 3
the spatial distribution of the scattered light is correlated to the size of the particles in the air, so that, by appropriate algorithms... it is possible to calculate the distribution of the size of the particles
Data Source
AI summary
A process for manufacturing an optical system includes forming a first hydrophobic surface at a semiconductor substrate, providing a first drop of transparent material having a first shape on the first hydrophobic surface, and allowing the first drop to harden to form a first optical element having the first shape. The optical system may be a particle detector, and the process may optionally further include forming a light source at the semiconductor substrate configured to generate a light beam that passes through the first optical element and a cavity to a photodetector.