Thermal Accelerometer Variable Width Pulse Feedback
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Solution Overview
Problem
Existing thermal accelerometers with feedback mechanisms are complex to manage and sensitive to electromagnetic interference, compromising their ability to maintain precision and detect high-frequency acceleration variations effectively.
Innovation Solution
A thermal accelerometer design featuring two temperature-sensitive detection strands, a feedback system that generates signals with variable widths based on a comparison between sawtooth and continuous signals, and a multiplexing element for automatic temperature compensation, ensuring balanced feedback signals with zero mean value to mitigate electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback strands with constant width pulse signals are used, then temperature compensation is achieved, but the management of feedback signals becomes complex
Solution Approach 1:
The patent transitions from constant width pulse signals to variable width pulse signals where the pulse width dynamically adjusts based on the temperature difference magnitude. This dynamic approach simplifies the feedback signal management while maintaining effective temperature compensation, as the pulse width directly represents the compensation amount needed without requiring complex timing control
Solution Approach 2:
The invention changes the parameter of pulse signal width from constant to variable, where the width is modulated according to the temperature difference detected. This parameter change allows the feedback mechanism to convey temperature compensation information more efficiently, reducing the complexity of signal management while preserving measurement precision
2Measurement precision
If feedback signals are applied to improve detection precision, then the accelerometer becomes sensitive to electromagnetic disturbances
Solution Approach 1:
The patent implements a feedback mechanism where temperature difference detection triggers compensatory pulse signals applied to the detection strands. This feedback loop continuously corrects temperature-induced resistance changes, maintaining detection precision while the controlled application of feedback signals minimizes electromagnetic interference sensitivity through balanced current patterns
Solution Approach 2:
The invention introduces temperature compensation as an intermediary mechanism that mediates between the detection strands and the measurement circuit. By compensating for temperature effects before they reach the measurement stage, the system maintains precision without requiring additional feedback signals that would increase electromagnetic sensitivity
3Device complexity
If variable width pulse signals are used, then feedback management is simplified, but signal synchronization becomes more difficult
Solution Approach 1:
The patent employs periodic sawtooth waveforms as the basis for generating variable width pulse signals. This periodic action provides a regular, predictable timing structure that simplifies synchronization, as the repeating pattern establishes consistent reference points for signal alignment while still allowing variable pulse widths to encode temperature difference information
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
Simplifies the management of feedback signals, enhances precision in detecting acceleration variations, and maintains insensitivity to electromagnetic disturbances, achieving performance comparable to zero-feedback accelerometers.
Implementation Method 1
two detection strands (1, 2) having a resistivity sensitive to the temperature
Implementation Method 2
a counter-reaction device for establishing a balance of temperature between the sensing strands by supplying the sensing strands with feedback signals
Implementation Method 3
The detection strands are mounted in a Wheatstone bridge with fixed resistors. The Wheatstone bridge is connected to a measurement circuit providing an electrical signal representative of a temperature difference between the detection strands
Implementation Method 4
a central heating strand (Bc) on either side of which extend detection strands
Data Source
Figure 1~2
AI summary
The accelerometer has detection lines and a detection unit detecting a temperature difference between the lines. A multiplexing unit is connected to the lines, the detection unit and an acceleration calculation and feedback unit to alternatively measure the temperature difference and to provide a feed-back signal to the lines. The width of the signal is determined by comparing a saw-tooth signal and a continuous signal that represents the temperature difference, where the continuous signal is symmetric with respect to an average value of the saw-tooth signal.