Particle Sensor Extraction from Flow Path
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Solution Overview
Problem
Conventional suspended particle sensor devices face accuracy degradation and reduced service life due to particle accumulation on the light sensor, which affects the measurement of particulate concentrations.
Innovation Solution
The particle sensing device is designed with a sensor positioned outside the detecting channel, preventing fluid flow and thus preventing particles from accumulating on the sensor, while using a light source to emit light towards the channel and a photodiode to detect scattered light energy, maintaining accuracy and extending the device's service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light sensor is disposed at a position where the fluid passes through to enable light scattering measurement, then the measurement of particulate concentrations can be performed, but particles would accumulate on the light sensor after long operation, decreasing measurement accuracy and reducing service life
Solution Approach 1:
The patent extracts the light sensor from the fluid flow path by positioning it on the surrounding wall outside the detecting channel. This separation removes the harmful effect of particle accumulation on the sensor while preserving the measurement function through optical coupling via the surrounding wall.
Solution Approach 2:
The surrounding wall acts as an intermediary between the detecting channel and the light sensor. It transmits scattered light energy from particles in the fluid to the sensor positioned outside the flow, enabling measurement without direct contact between the sensor and particles.
2Productivity
If the light sensor is positioned inside the detecting channel to directly detect scattered light, then the sensing function can be performed, but particles would settle and accumulate on the sensor, causing sensing errors
Solution Approach 1:
The light sensor is extracted from the detecting channel environment and repositioned on the surrounding wall. This eliminates the direct exposure to particles that causes accumulation and sensing errors, while the optical path through the surrounding wall maintains the sensing function.
Solution Approach 2:
The sensor is positioned in a different spatial dimension (outside the channel on the surrounding wall) rather than inside the flow path. This dimensional relocation allows the sensor to detect scattered light without being subjected to particle deposition in the fluid stream.
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 configuration maintains sensing accuracy and reduces errors, extending the service life of the device by preventing particle accumulation on the sensor, while effectively measuring particulate concentrations.
Implementation Method 1
A suspended particle sensor device usually measures particulate concentration via light scattering techniques, and the suspended particle sensor device comprises a light source and a light sensor. The suspended particle sensor device detects particles by using the light source emitting light towards the fluid and the light sensor sensing scattered light.
Implementation Method 2
The sensor is configured to detect a scattered light energy generated when the light hits the at least one particle.
Data Source
AI summary
A particle sensing device, configured to detect a particulate concentration in a fluid, includes a detecting channel, a sensing space, a light source and a sensor. The detecting channel is configured for the fluid to flow therethrough. The sensing space is located on one side of the detecting channel and connected to the detecting channel, and the sensing space is surrounded by a surrounding wall. The light source and the sensing space are located on opposite sides of the detecting channel, and the light source is configured to emit light towards the detecting channel. The light is configured to hit at least one particle in the fluid. The sensor is disposed on an inner surface of the surrounding wall, and the sensor is configured to detect a scattered light energy generated when the light hits the particle. The sensor is a distance apart from the detecting channel.