Freeze-Resistant Accelerometer Cold Sink Design
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Solution Overview
Problem
Accelerometers face performance issues due to condensation or ice formation on the proof mass, which impedes the free movement and sensitivity of the device, especially when moisture enters the housing during operation or due to inadequate sealing.
Innovation Solution
Incorporating a cold temperature sink with a condensing surface within the accelerometer's housing, spaced from the proof mass, to promote condensation or ice formation away from the proof mass, thereby diverting condensate or ice and reducing their formation near the proof mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is sealed to prevent moisture entry, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by providing a hermetic seal during manufacturing to prevent moisture entry before condensation can occur during operation. This proactive sealing approach ensures reliability without requiring complex active control systems during device operation.
2Measurement precision
If the proof mass is exposed to detect displacement, then measurement precision is improved, but sensitivity to condensation and ice formation increases
Solution Approach 1:
The patent extracts the harmful condensation and ice formation from the proof mass environment by providing a hermetic seal that isolates the proof mass from moisture in the external environment. This separation allows the proof mass to remain exposed for accurate displacement detection while protecting it from condensation-related harmful effects.
3Object-affected harmful factors
If the housing is opened to allow moisture dissipation, then condensation is reduced, but reliability decreases due to moisture entry
Solution Approach 1:
The patent applies preliminary action by establishing a hermetic seal during manufacturing that proactively prevents moisture entry and condensation formation. This eliminates the need to open the housing during operation to dissipate condensation, thereby maintaining both low condensation and high reliability simultaneously.
4Reliability
If hermetic sealing is implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements hermetic sealing as a preliminary action during manufacturing, which provides reliable protection against environmental factors without adding operational complexity. The seal is established once during fabrication and requires no active maintenance or complex control systems during device operation.
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 solution effectively reduces or prevents condensation and ice formation on the proof mass, improving the sensitivity and accuracy of the accelerometer by ensuring the free movement of the proof mass and maintaining performance even under changing humidity and temperature conditions.
Implementation Method 1
The condensing surface is configured to promote at least one of condensation or ice formation in an interior of the housing
Implementation Method 2
The condensing surface is spaced from the proof mass to divert at least one of condensate or ice away from the proof mass
Data Source
AI summary
In some examples, the disclosure describes an accelerometer including a proof mass, and a housing enclosing the proof mass. The accelerometer includes a cold temperature sink defining a condensing surface. In some examples, the disclosure describes a technique for making an accelerometer. The example technique includes forming a cold temperature sink defining a condensing surface, and enclosing a proof mass in the housing. The condensing surface is configured to promote at least one of condensation or ice formation in an interior of the housing. The condensing surface is spaced from the proof mass to divert at least one of condensate or ice away from the proof mass.