Adjustable Conveying Device for Particle Sensor Dust Control
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Solution Overview
Problem
Existing particle-measuring apparatuses face contamination and reduced service life due to high dust loads on optical components, particularly the optical particle sensor, leading to inaccurate measurements and maintenance challenges during extended operating times.
Innovation Solution
The apparatus features an adjustable conveying device that reduces the aerosol delivery rate based on detected particle mass concentrations, minimizing dust deposits on optical components while maintaining measurement validity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the aerosol delivery rate is maintained at a high level to ensure sufficient measurement signal, then measurement precision is improved, but dust accumulation on optical components increases
Solution Approach 1:
The conveying device is designed with adjustable delivery rate capability, allowing the system to dynamically adapt the aerosol flow to match actual measurement requirements rather than operating at constant high flow, thereby reducing dust accumulation while maintaining measurement quality
Solution Approach 2:
The system changes the delivery rate parameter of the conveying device based on measurement conditions, optimizing the balance between obtaining sufficient measurement signal and minimizing dust deposits on optical components
2Duration of action of stationary object
If the aerosol delivery rate is reduced to minimize dust deposits, then service life of optical components is improved, but measurement signal quality deteriorates
Solution Approach 1:
The adjustable delivery rate allows the system to optimize aerosol flow dynamically, reducing flow to extend component service life while maintaining sufficient measurement signal quality through controlled operation
Solution Approach 2:
The system uses measurement results to feedback control the delivery rate, ensuring that dust accumulation is minimized while measurement precision requirements are maintained through adaptive adjustment
3Reliability
If the conveying device operates continuously at high delivery rate to maintain measurement accuracy, then measurement reliability is improved, but contamination of optical components increases
Solution Approach 1:
The conveying device transitions from continuous high-rate operation to adjustable-rate operation, maintaining measurement reliability through optimized delivery rates that reduce contamination while ensuring sufficient aerosol supply for accurate measurements
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 significantly reduces dust accumulation on optical components, ensuring accurate and reliable measurements over extended operating periods without compromising output values, thereby extending the service life of the apparatus.
Implementation Method 1
aerosol photometers (APMs) are used, which are also referred to in the technical literature as 'light-scattering nephelometers'
Data Source
AI summary
A particle-measuring apparatus (1) has an optical particle sensor (2, 3, 5, 6). By means of the optical particle sensor (2, 3, 5, 6) a particle mass concentration in an aerosol volume can be detected. Furthermore, the particle-measuring apparatus (1) has a measurement chamber (7), in which the aerosol volume to be examined with regard to the particle mass concentration by means of the optical particle sensor (2, 3, 5, 6) can be received, and a conveying device (11), by means of which the aerosol can be introduced into the measurement chamber (7).In order to prevent the particle-measuring apparatus (1) from being adversely affected during operation as a result of dirt or particle deposits, it is proposed that the delivery rate of the conveying device (11) of the particle-measuring apparatus (1) is adjustable.