Fluid Property Detection Device Noise Isolation
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Solution Overview
Problem
Existing fluid-property detection devices face accuracy issues due to external noise interference, particularly from commercial power supplies, which affects the measurement of small voltage values in fluid conductivity measurements.
Innovation Solution
The device incorporates a tubular outer electrode and a bar-shaped inner electrode with insulating spacers between the housing and electrodes to isolate noise, along with an electrode cover to protect the tip ends and improve reliability, enhancing the insulation and positioning of the electrodes within the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the container containing the liquid is electrically connected to the outer electrode via the electrode seat, then the structural simplicity is improved, but the measurement accuracy is deteriorated by external noise influence
Solution Approach 1:
The patent introduces an insulating member as an intermediary component between the electrode and the container. This insulating member electrically isolates the electrode from the container, preventing noise transmission while still allowing the electrode to be positioned within the container for measurement purposes.
Solution Approach 2:
The patent divides the electrode structure into separate functional components: the measurement electrode, the insulating member, and the container connection structure. This segmentation allows each component to perform its specific function independently, with the insulating member specifically tasked with noise isolation.
2Measurement precision
If the voltage detection value is very small compared with the commercial power supply voltage, then the sensitivity of the measurement is improved, but the influence of noise from the commercial power supply is largely increased
Solution Approach 1:
The insulating member acts as an intermediary that blocks the transmission of electromagnetic noise from the power supply system to the sensitive voltage detection circuit, while allowing the small measurement signal to pass through unaffected.
Solution Approach 2:
The patent applies preliminary anti-action by pre-establishing electrical isolation through the insulating member before noise can affect the measurement. This preventive measure blocks noise pathways in advance, protecting the sensitive detection system.
3Measurement precision
If the electrode tip end portions are exposed to the detection target fluid, then the measurement capability is improved, but the vulnerability to damage and contamination is increased
Solution Approach 1:
The patent applies local quality by providing protective coverage only at the electrode tip end portions that are exposed to the fluid, while leaving the measurement-active surfaces accessible. This localized protection maintains measurement capability while preventing damage to vulnerable areas.
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 effectively suppresses external noise influence, improving detection accuracy and reliability by maintaining consistent electrode spacing and protecting the electrodes from damage, allowing for stable measurements regardless of attachment angle.
Implementation Method 1
an outer insulating member provided between the housing and the outer electrode, the outer insulating member being configured to insulate between the housing and the outer electrode
Implementation Method 2
a computing unit configured to compute a property value of the detection target fluid based on an electrical property between the outer electrode and the inner electrode
Data Source
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AI summary
A fluid-property detection device 100 includes a housing 10 attached to the external device, the housing being configured to hold the outer electrode 20 and the inner electrode 30, an outer insulating member 40 provided between the housing 10 and the outer electrode 20, the outer insulating member 40 being configured to insulate between the housing 10 and the outer electrode 20 and being configured to define a position of the outer electrode 20 with respect to the housing 10, and an inner insulating member 50 provided between the outer electrode 20 and the inner electrode 30, the inner insulating member being configured to insulate between the outer electrode 20 and the inner electrode 30, being configured to insulate between the housing 10 and the inner electrode 30, and being configured to define a position of the inner electrode 30 with respect to the housing 10. The outer electrode 20 and the inner electrode 30 respectively have tip end portions, the tip end portions projecting out from the housing 10 and being configured to expose to the detection target fluid contained in the external device.