Gravity Gradiometer Sensor Mass Balancing Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gravity gradiometers face challenges in accurately measuring diagonal and off-diagonal components of the gravitational gradient tensor, particularly when in motion, due to difficulties in distinguishing spatial variations from temporal fluctuations, and require precise balancing of sensor masses for operation.
Innovation Solution
A gravity gradiometer design incorporating a capacitor plate concentric with a sensing coil, forming a capacitor used in a balancing circuit, allows for precise adjustment and measurement of sensor mass balance, ensuring accurate measurements of the gravity gradient components by maintaining consistent gap spacing during both balancing and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a capacitor plate is positioned close to the sensing coil for balancing circuit operation, then the balancing precision is improved, but the risk of electrical interference and signal distortion increases
Solution Approach 1:
An insulating structure is introduced as an intermediary element between the capacitor plate and the sensing coil. This insulator maintains the electrically isolated close spacing required for precise balancing while preventing direct electrical interference. The insulator acts as a mediator that allows the beneficial close proximity for capacitance while blocking the harmful electrical coupling.
Solution Approach 2:
The space between the capacitor plate and sensing coil is segmented into distinct functional zones: the capacitor plate region, the insulating barrier region, and the sensing coil region. This segmentation allows each component to operate in its optimal environment while maintaining the necessary close proximity for high-precision balancing without direct interference.
2Adaptability or versatility
If the gradiometer is used in airborne conditions with motion, then the versatility and applicability are improved, but the measurement accuracy deteriorates due to temporal fluctuations
Solution Approach 1:
The sensor mass balancing is performed in advance using the capacitor plate and sensing coil arrangement before airborne operation begins. This preliminary balancing action ensures that the sensor mass is optimally positioned to minimize sensitivity to temporal fluctuations, allowing accurate gravity gradient measurements even during airborne motion.
Solution Approach 2:
The capacitor plate-sensing coil arrangement provides a feedback mechanism for monitoring and adjusting sensor mass balance. During airborne operation, this feedback system continuously ensures that the sensor mass remains properly balanced despite vibrations and motions, maintaining measurement accuracy while enabling versatile airborne application.
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 design enhances the accuracy and precision of gravity gradient measurements by enabling effective balancing and operation of the gradiometer, even in airborne conditions, by using a concentric capacitor plate and coil arrangement that sees the same signal environment, thus improving the detection of subtle gravitational variations.
Implementation Method 1
a capacitor plate having a concentric arrangement with the sensing coil for providing one plate of a capacitor used in a balancing circuit for measuring the balance of the sensor mass
Implementation Method 2
a transducer for measuring the movement of the sensor mass, the transducer having a sensing coil mounted on a mount element and located adjacent the sensor mass
Implementation Method 3
at least one sensor mass for movement in response to at least one component of the gravity gradient tensor
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
A gravity gradiometer is described which comprises a pair of sensor bars (41, 43) arranged in housings (45, 47). Transducers (71) are arranged adjacent the bars (41, 43) for measuring movement of the bars in response to the gravity gradient tensor. At least one of the transducers has a sensing coil (510) and a capacitor plate (518a) having a concentric arrangement with the sensing coil (510) for providing one plate of a capacitor used in a balancing circuit for measuring the balance of the sensor mass.