Auto-ranging Time-domain Inertial Sensor
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Solution Overview
Problem
Existing inertial sensors face challenges with high cost, limited dynamic range, and the need for periodic recalibration due to noise interference and limited accuracy, making them unsuitable for wide-ranging applications.
Innovation Solution
A time-domain inertial sensor system that uses a harmonic oscillator positioned between capacitive plates, with electrostatic biasing to alter the spring constant, allowing for self-calibration and accurate force measurements over a wide dynamic range through monitoring of trigger events and oscillation periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inertial sensors are used to achieve sufficient measurement accuracy, then measurement precision is improved, but device cost increases
Solution Approach 1:
The patent replaces conventional mechanical sensing systems with a time-domain inertial sensor that uses a harmonic oscillator and electronic timing circuits. The oscillator responds to inertial forces, and the system measures the time interval between oscillation cycles rather than using complex mechanical deflection measurement systems. This substitution reduces manufacturing cost while maintaining high measurement precision through electronic timing measurement.
2Measurement precision
If conventional inertial sensors are used to achieve sufficient measurement accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical measurement systems with a simplified time-domain approach. Instead of measuring small mechanical deflections with complex optical or capacitive sensors, the system uses a harmonic oscillator and measures the time interval between oscillation cycles using simple electronic timing circuits. This reduces device complexity while maintaining measurement accuracy.
Solution Approach 2:
The harmonic oscillator serves multiple functions: it acts as the sensing element that responds to inertial forces, provides the measurement mechanism through its oscillation period, and enables self-calibration. The system uses the oscillator's natural properties to determine measurement scale, reducing the need for external calibration equipment and simplifying the overall device architecture.
3Adaptability or versatility
If conventional inertial sensors are used for wide dynamic range measurement, then measurement range is improved, but device complexity increases
Solution Approach 1:
The patent employs a harmonic oscillator that can dynamically adjust its oscillation period in response to applied forces. By measuring the time interval between oscillation cycles, the system can accommodate a wide range of force magnitudes without requiring multiple sensors or complex switching mechanisms. The dynamic nature of the oscillator allows it to adapt to different measurement ranges automatically.
4Reliability
If conventional inertial sensors are used to reduce noise interference, then measurement reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical deflection measurement with time-domain measurement of oscillation cycles. This substitution inherently reduces susceptibility to noise because timing measurements can be made with high precision using electronic counters, and the oscillatory nature of the sensor provides natural noise filtering through averaging over multiple cycles. The approach reduces the need for complex signal conditioning circuitry.
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 system provides high-resolution, low-cost, and self-calibrating inertial sensing with reduced noise interference, enabling accurate force measurements across a broad range without the need for frequent recalibration.
Implementation Method 1
initiating harmonic oscillation of the oscillator in a first plane by creating with the capacitive plates a capacitively forced pulse
Implementation Method 2
electrostatically biasing both of the two capacitive plates such that a spring constant of the oscillator is effectively altered
Implementation Method 3
monitoring the harmonic oscillation of the oscillator
Data Source
AI summary
A method for adjusting the accuracy of a time-domain inertial sensor comprising the following steps: operatively positioning a harmonic oscillator of the time-domain inertial sensor between two capacitive plates; initiating harmonic oscillation of the oscillator in a first plane by creating with the capacitive plates a capacitively forced pulse; monitoring the harmonic oscillation of the oscillator; and electrostatically biasing both of the two capacitive plates such that a spring constant of the oscillator is effectively altered.