Accelerometer Closed-Loop Test Signal Injection
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Solution Overview
Problem
Current seismic exploration methods for detecting hydrocarbon deposits lack effective techniques for testing and ensuring the performance of accelerometers, which are crucial for accurately measuring subterranean geological formations.
Innovation Solution
A method and apparatus that utilize a closed-loop system with a capacitive MEMS-based accelerometer, where a test signal is injected into the system to evaluate the accelerometer's performance by adjusting the restoring force and providing feedback, allowing for the assessment of acceleration measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a closed-loop system with feedback is used to test the accelerometer, then the measurement precision and reliability of acceleration measurements are improved, but the device complexity increases due to the additional feedback components and testing apparatus
Solution Approach 1:
The patent implements a closed-loop feedback system where the accelerometer output is fed back to the input through a summing junction. This feedback mechanism allows the system to compensate for errors and improve measurement precision by continuously adjusting the restoring force based on the actual acceleration measurements, thereby resolving the contradiction between improved measurement precision and increased system complexity.
Solution Approach 2:
The patent introduces a test signal injection point as an intermediary element between the accelerometer output and the feedback path. This intermediary allows for controlled testing and evaluation of the accelerometer performance without requiring complete system redesign, thus improving measurement precision while managing the complexity increase through modular testing capability.
2Reliability
If a test signal is injected into the closed loop to evaluate accelerometer performance, then the reliability of the accelerometer is improved through performance testing, but the device complexity increases due to the testing apparatus and signal injection mechanisms
Solution Approach 1:
The patent enables the accelerometer system to perform self-testing by injecting test signals through the existing feedback path. The system uses its own closed-loop structure to evaluate its performance, eliminating the need for entirely separate external testing equipment. This self-service capability improves reliability through systematic performance evaluation while minimizing the addition of complex external testing apparatus.
Solution Approach 2:
The feedback path in the patent serves multiple functions: it provides closed-loop control for improved measurement precision, enables performance testing through test signal injection, and allows for system calibration. This multi-functionality improves accelerometer reliability through comprehensive testing while avoiding the need for separate dedicated testing components, thus managing complexity effectively.
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 enables reliable testing and performance evaluation of accelerometers, enhancing the accuracy of seismic data acquisition and improving the detection of hydrocarbon deposits by ensuring precise acceleration measurements.
Implementation Method 1
A capacitive microelectromechanical systems (MEMS)-based accelerometer employs a closed loop to provide electrostatic restoring force to a movable mass
Implementation Method 2
The accelerometer includes an electrostatic actuator that generates restoring force to return the movable mass to its equilibrium position
Data Source
AI summary
A technique includes using an accelerometer to provide an output signal indicative of an acceleration experienced by a movable mass of a sensor of the accelerometer. The technique includes testing the accelerometer, and the testing includes using a closed loop including the sensor to provide the output signal of the accelerometer; injecting a test signal into the loop between an output terminal of the sensor and an output terminal of the accelerometer; and indicating a performance of the accelerometer based on a response of the accelerometer to the injection of the test signal.