Helium Gas Enclosed Accelerometer for Thermal Distortion Control
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Solution Overview
Problem
Existing accelerometer systems face challenges in accurately measuring high levels of acceleration and detecting small changes in acceleration values, especially in high-vacuum environments where optical signal power increases can lead to frequency nonlinearities and 'shark fin' distortions, affecting data accuracy.
Innovation Solution
The proposed accelerometer system employs a combination of optical and electrical signals using double-ended tuning fork structures suspended in a housing with a partial pressure of Helium gas between 0.1 torr and 760 torr, which absorbs heat and maintains a high mechanical quality factor, and utilizes positive feedback loops to efficiently calculate acceleration values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical signal power is increased to improve measurement sensitivity, then acceleration detection capability improves, but frequency nonlinearities and shark fin distortions occur affecting data accuracy
Solution Approach 1:
The patent introduces Helium gas as an intermediary substance between the optical components and the proof mass. The Helium gas absorbs excess optical heat without significantly interfering with the optical signal transmission or mechanical oscillation, thereby enabling high optical signal power to be used for improved sensitivity while preventing thermal distortions that would compromise data accuracy
Solution Approach 2:
The patent changes the environmental parameter by introducing Helium gas at a controlled partial pressure (0.1 to 760 torr) into the housing. This parameter change modifies the thermal properties of the environment, allowing efficient heat absorption while maintaining the mechanical quality factor of the DETF structures, thus resolving the contradiction between sensitivity and accuracy
2Temperature
If Helium gas partial pressure is increased to improve heat absorption, then thermal distortion decreases, but mechanical quality factor may be affected
Solution Approach 1:
The patent optimizes the Helium gas partial pressure parameter within a specific range (0.1 to 760 torr) to achieve the best balance between heat absorption capability and mechanical quality factor maintenance. This parameter optimization allows the system to absorb thermal energy effectively while minimizing damping effects on the DETF structures
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 enhances the sensitivity and accuracy of acceleration measurements, enabling the detection of high acceleration values and small changes while minimizing distortions, thereby improving the overall quality of acceleration data.
Implementation Method 1
Helium gas defining a partial pressure within a range between 0.1 torr and 760 torr, where the Helium gas absorbs heat
Data Source
AI summary
This disclosure is related to devices, systems, and techniques for determining, using an electro-opto-mechanical accelerometer system, a frequency value in order to determine an acceleration value. For example, an accelerometer system includes a light-emitting device configured to emit an optical signal and a circuit. The circuit is configured to determine a frequency value corresponding to the optical signal and determine an acceleration value based on the frequency value. Additionally, the accelerometer system includes a housing that encloses the light-emitting device, the circuit, and Helium gas, where the Helium gas defines a partial pressure within a range between 0.1 torr and 760 torr.