Smartphone Dust Sensor Using Two-Target Optical Extinction
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Solution Overview
Problem
Current methods for measuring dust concentration in industrial environments are either time-consuming, costly, or unsuitable for real-time monitoring due to the need for specialized equipment and calibration, and lack portability and cost-effectiveness.
Innovation Solution
A novel two-target method using a smartphone camera to measure dust concentration by analyzing the extinction coefficient between two targets with contrasting darker and lighter sections, allowing for the calculation of dust concentration through empirical linear regression models and noise reduction techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gravimetric methods are used to measure dust concentration, then measurement accuracy is improved, but time consumption increases and real-time monitoring capability is lost
Solution Approach 1:
The patent replaces the mechanical gravimetric weighing system with an optical imaging system. Instead of collecting particles on filters and weighing them, the invention uses a camera to capture images of dust clouds and algorithms to analyze light scattering patterns, enabling real-time measurement without physical filtration or weighing steps.
Solution Approach 2:
The patent employs a controlled airflow system to generate and sustain dust clouds within the measurement chamber. Compressed air is used to introduce dust samples and maintain them in suspension, allowing continuous optical measurement rather than batch gravimetric analysis.
2Measurement precision
If specialized equipment like laser and photodiode systems are used, then measurement capability is improved, but device cost and complexity increase
Solution Approach 1:
The patent uses a standard digital camera to capture images of dust clouds, replacing specialized photodiode arrays and laser systems. The camera records visual information about dust distribution and concentration, which is then processed through algorithms to derive measurement data, eliminating the need for expensive specialized sensing equipment.
Solution Approach 2:
The patent employs a standard digital camera that can serve multiple functions: capturing dust cloud images, providing reference background through included targets, and enabling real-time visualization. This universal device replaces multiple specialized instruments, reducing system complexity and cost.
3Reliability
If fixed installation of measurement equipment is performed, then measurement stability is improved, but portability and adaptability to different locations are reduced
Solution Approach 1:
The patent transitions from fixed installation to a portable, movable measurement system. The camera, targets, and dust cloud generation apparatus are designed to be easily transported and repositioned, allowing the system to dynamically adapt to different measurement locations and dust emission sources within industrial facilities.
Solution Approach 2:
The patent includes self-contained reference targets with known optical properties that are imaged alongside the dust cloud. These targets provide automatic calibration and reference data, eliminating the need for external calibration equipment or fixed installation infrastructure, thereby enabling portable deployment.
4Measurement precision
If traditional laser-based equipment is used, then measurement accuracy is improved, but measurement area coverage is limited
Solution Approach 1:
The patent transitions from line-based laser measurement to area-based optical imaging. The camera captures two-dimensional images of the entire dust cloud within the chamber, providing simultaneous measurement across the full measurement area rather than along a single laser beam path, thereby increasing spatial coverage.
Solution Approach 2:
The patent combines multiple measurement functions into a single imaging system. The camera simultaneously captures dust cloud distribution, concentration information through light scattering analysis, and reference target images for calibration, merging what would traditionally require separate instruments into one integrated system with broad area coverage.
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 method provides a low-cost, portable, and real-time measurement of dust concentration, capable of covering larger areas than traditional laser-based equipment, with high accuracy and quick response times, suitable for practical industrial applications.
Implementation Method 1
Light scattering is also exploited by the portable dust track aerosol monitor optical fiber method
Implementation Method 2
This probe includes a laser and a photodiode, which must be calibrated before use. Light scattering is also exploited
Data Source
AI summary
The present disclosure provides to a novel two-target method for measuring the concentration of dust clouds, and an apparatus system that uses the novel two-target method. Cornstarch, corn dust, and saw dust are tested with the apparatus system with the method. This method used the light extinction coefficient of a dust cloud between two targets using a digital camera. This extinction coefficient is linearly related to the concentration of the dust, and the mass extinction coefficient is the key value for this measurement method. The mass extinction efficiency (K) depend greatly on the physical and chemical properties of the dust particles.