Airship Electromagnetic Survey Coil Placement
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Solution Overview
Problem
Airborne electromagnetic surveys using fixed-wing or rotary-wing aircraft face challenges such as high costs, safety risks, and signal interference due to the aircraft's metal body and electronic components, limiting the efficiency and reliability of measurement results, and requiring multiple flights for repositioning coils to optimize survey data acquisition.
Innovation Solution
An airship-based electromagnetic survey apparatus with transmission and reception coils mounted on the envelope, minimizing signal interference and allowing optimized coil placement for various survey purposes, enabling comprehensive data acquisition in a single flight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission coil and reception coil are disposed on the fuselage of fixed-wing or rotary-wing aircraft, then airborne electromagnetic survey can be conducted, but signal interference occurs due to metal body and electronic components
Solution Approach 1:
The patent extracts the coils from the metal fuselage environment and places them on a non-conductive envelope surface. The envelope serves as an isolated platform that separates the electromagnetic measurement system from the interfering metal body and electronic components, thereby eliminating signal interference while maintaining measurement reliability
Solution Approach 2:
The envelope acts as an intermediary platform between the aircraft structure and the electromagnetic coils. This non-conductive intermediate surface allows the coils to be positioned away from interfering metal structures while still being supported and positioned during flight, resolving the conflict between structural support and electromagnetic signal quality
2Stability of the object's composition
If fixed-wing aircraft with elaborate lift structure is used, then stable flight is achieved, but placement of coils is restricted
Solution Approach 1:
The patent moves the coil placement from the constrained three-dimensional space within the aircraft fuselage to the two-dimensional outer surface of the envelope. This dimensional transition provides abundant placement options on the envelope surface while maintaining the stable flight characteristics of the aircraft, thereby resolving the conflict between structural stability and placement flexibility
3Ease of operation
If rotary-wing aircraft is used for electromagnetic survey, then survey can be conducted, but aircraft must fly at low altitude with bulky coil structure suspended, causing safety risks
Solution Approach 1:
The patent merges the coil structure with the envelope surface, eliminating the need for separate suspension systems. The coils are directly mounted on the envelope, which streamlines the overall structure, reduces the bulkiness of suspended components, and improves flight safety by eliminating low-altitude flight requirements while maintaining survey operation capability
4Adaptability or versatility
If transmission coil and reception coil are repositioned for different survey purposes, then various survey data can be acquired, but multiple flights are required
Solution Approach 1:
The patent performs preliminary action by pre-positioning multiple coils in different locations on the envelope surface before flight. This allows the aircraft to acquire various survey data from different positions simultaneously during a single flight, eliminating the need for multiple flights that would be required if coils needed to be repositioned between flights
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
The airship-based system reduces survey costs, enhances measurement reliability by minimizing signal interference, and improves safety by allowing precise coil placement and operation, enabling accurate data interpretation and efficient data collection without the need for repeated flights.
Implementation Method 1
an alternating current is allowed to flow through a transmission loop coil facing the ground to generate a primary magnetic field
Implementation Method 2
a secondary magnetic field induced by an eddy current generated under the ground due to the primary magnetic field is observed through a reception coil
Implementation Method 3
a secondary magnetic field induced by an eddy current generated under the ground due to the primary magnetic field
Data Source
AI summary
An electromagnetic exploration device minimizes signal interference due to a metal body or electronic components that constitute an air vehicle by installing a transmission coil and a receiving coil in an envelope of an airship, and enables a batch arrangement of the optimized transmission coil and receiving coil in accordance with various exploration purposes using the envelope shape, thereby acquiring exploration data from one flight. The device in an airship having an envelope includes: a transmission coil along the periphery of the horizontal axial direction of the envelope, for generating a primary magnetic field; at least one receiving coil along the periphery of the envelope, for detecting a secondary magnetic field induced by the primary magnetic field; and an analyzing device for applying an electric current to the receiving coil and analyzing a measurement value of the secondary magnetic field detected by the receiving coil, thereby performing air electromagnetic exploration.