Inductive Coupling for Pollutant Sensor Maintenance
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Solution Overview
Problem
Existing measurement instruments for pollutants in liquids face challenges in maintenance due to risk of water penetration and corrosion in dirty marine environments, requiring well-trained personnel for sensor unit replacement and calibration, and suffer from galvanic corrosion issues.
Innovation Solution
The instrument employs inductive or capacitative energy transfer between housings, eliminating conductive connections and using a metal sensor unit with the same potential as the liquid, along with optical signal transfer and sealed designs to prevent corrosion and facilitate maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cable communication is used between main unit and sensor unit, then electricity and measurement signals can be transferred, but water penetration and corrosion risks increase when sensor unit is dismounted for maintenance
Solution Approach 1:
The patent replaces the mechanical cable connection system with an inductive coupling system. The sensor unit contains a coil that inductively couples with a coil in the main unit, enabling electricity and signal transfer without physical contact. This eliminates the need for cable connections that would require disconnection during maintenance, thereby preventing water penetration and corrosion while maintaining operational functionality.
2Ease of manufacture
If cable communication is used between main unit and sensor unit, then electricity can be supplied to sensor unit, but contact surfaces get dirtyed and require specialized personnel for maintenance
Solution Approach 1:
The patent eliminates mechanical cable connections by using inductive coupling between coils. The sensor unit can be freely removed and reinstalled without touching any electrical contacts, preventing contamination of contact surfaces. This non-contact energy and signal transfer mechanism allows maintenance personnel to service the sensor unit without risking contamination, thereby improving maintenance accessibility.
3Loss of information
If electric cable communication is used, then measurement signals can be transmitted, but galvanic currents cause corrosion problems
Solution Approach 1:
The patent replaces conductive cable communication with inductive coupling between coils. This non-contact coupling allows measurement signals to be transmitted without creating galvanic connections between dissimilar metals. The inductive coupling transfers energy and signals through magnetic fields rather than direct electrical contact, thereby eliminating galvanic currents and corrosion problems while maintaining signal transmission capability.
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
Facilitates easy calibration, cleaning, and maintenance by preventing water ingress and corrosion, reducing the need for specialized personnel and ensuring reliable operation in harsh environments.
Implementation Method 1
both the first and the second housing or casing have mutually cooperating devices for inductive or capacitative energy transfer therebetween
Implementation Method 2
both the first and the second housing or casing have mutually cooperating devices for inductive or capacitative energy transfer therebetween
Implementation Method 3
the electronics in the sensor unit will have an electric potential that is determined by the electric potential in the main unit and that does not necessarily correspond with the potential in the housing of the sensor unit or in the liquid passing through the sensor unit. This may give rise to galvanic currents with attendant corrosion problems
Data Source
AI summary
In a measurement instrument for measuring pollutants in a liquid, such as oil in water, the measurement instrument includes a main unit disposed in a first housing and a sensor unit disposed in a second housing. The housing, manufactured from an electrically insulating material, and an associated electric connection, are sealed against the passage of gas and liquid. The sensor unit has connections which are connected to a conduit system in which flows the liquid which is to be inspection measured. Sensors are further disposed in the sensor unit for emitting a measurement signal. The sensor unit and its electronics lack galvanic connection with electrically conductive components in the main unit, transfer of measurement signals between both of the units taking place by optical energy transfer, capacitative or inductive transfer. The housings have apertures for the transfer of measurement signals which are closed by non-electrically conductive foils which, when the main unit and the sensor unit are mounted together, abut against one another so they are protected against outer damage.