Optical Dust Depth Monitoring System for Ventilation Ducts
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Solution Overview
Problem
Current methods for determining the need to clean ventilation ducts are time-consuming and inefficient, often requiring visual inspections or disassembly, and there is a need for a more efficient way to monitor dust buildup within ducts to avoid unnecessary cleaning.
Innovation Solution
A monitoring system using a light source and sensor arrangement, where the light source transmits light across a detection surface and the sensor measures the intensity of the light received, with a processing unit calculating the depth of dust based on the decrease in light intensity, allowing for battery operation through low-power 'sleep' mode and wireless communication of results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If visual inspection or disassembly is used to determine dust buildup, then cleaning decisions can be made, but the process is time-consuming and inefficient
Solution Approach 1:
The patent replaces manual visual inspection and disassembly with an automated optical measurement system. A light source emits light through the duct wall, and a sensor detects the transmitted light intensity. The system calculates dust layer thickness based on light absorption, eliminating the need for time-consuming manual inspection while enabling continuous monitoring for improved cleaning decision efficiency.
Solution Approach 2:
The patent introduces light as an intermediary to measure dust buildup indirectly. Instead of directly observing or touching the dust, the system uses light transmission through the duct wall as a mediator to detect dust layer thickness, enabling non-contact, rapid measurement that significantly reduces inspection time.
2Measurement precision
If continuous monitoring is implemented, then dust buildup can be tracked accurately, but energy consumption increases
Solution Approach 1:
The patent implements periodic measurement cycles instead of continuous monitoring. The system includes a control unit that activates the light source and sensor at predetermined intervals to measure dust layer thickness. Between measurements, the system enters a low-power state, significantly reducing battery consumption while maintaining adequate measurement precision for tracking dust buildup over time.
Solution Approach 2:
The patent makes the monitoring system dynamic by adjusting its operational state based on needs. The system transitions between active measurement mode and low-power standby mode, with the control unit determining when measurements are necessary. This dynamic operation optimizes the balance between measurement precision and energy consumption.
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 system provides a more efficient and cost-effective means to determine when ventilation ducts need cleaning by accurately measuring dust depth, reducing the frequency of unnecessary cleaning and preserving battery life through low-power operation.
Implementation Method 1
When dust is deposited on the surface it obstructs the light and the amount of light reaching the sensor decreases
Implementation Method 2
the substance throws a shadow on the array. The processing means can then determine the depth of the substance from the position on the array of the edge of the shadow
Data Source
Figure 1~2
Figure 3~5
Figure 6~7b
AI summary
A monitoring system is disclosed, designed to detect the depth of deposition of a substance on a' surface (12), such as the depth of dust in a ventilation shaft. The monitoring system includes a light source (14) and a sensor (16, 30). The light source is arranged to transmit light across a detection surface and the sensor is on the other side of the detection surface. When a substance, such as dirt or grease, is deposited on the surface it obstructs the light and the amount of light reaching the sensor decreases. A processing means (26) detects the decrease in light and from this the depth of the deposition on the surface can be calculated. Preferably the sensor comprises a CCD array (32), and the substance throws a shadow on the array. The processing means can then determine the depth of the substance from the position on the array of the edge of the shadow. Preferably the monitoring system is placed in a low power 'sleep' mode in between intermittent operations for detecting the depth of the substance. In this, way, it can be battery operated and the battery life is preserved.