Frangible Film Acceleration Sensor with Color-Changing Fluids
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Solution Overview
Problem
Current acceleration sensing devices lack a visual indication mechanism to detect specific acceleration levels, making it difficult to determine if an object has experienced excessive force, such as in protective gear or shipping applications.
Innovation Solution
A mechanical acceleration sensor with a hollow housing and a frangible film that separates two compartments containing different colored fluids, where the film ruptures upon reaching a specific acceleration level, causing the fluids to mix and change color, visually indicating the sensed acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a mechanical acceleration sensor uses internal components without visual indicators, then the device complexity is reduced, but the ability to detect and indicate specific acceleration levels is lost
Solution Approach 1:
The patent uses color-changing fluids to provide visual indication of acceleration events. When the mass ruptures the film, the mixing of fluids with different colors (e.g., colorless and yellow) creates a visible color change that indicates the acceleration threshold has been exceeded, eliminating the need for electronic displays or indicators
Solution Approach 2:
The frangible film acts as an intermediary element between the mass and the fluid compartments. It transmits the mechanical force from the accelerating mass to the fluid system, enabling the conversion of mechanical acceleration into a visible signal through controlled rupture and fluid mixing
2Strength
If the frangible film is made more resistant to rupture, then the sensor can detect higher acceleration levels, but the response time to indicate acceleration events increases
Solution Approach 1:
The patent adjusts the physical parameters of the frangible film (thickness, material composition, tensile strength) to match specific acceleration threshold requirements. By changing these parameters, the sensor can be calibrated to detect different acceleration levels while maintaining appropriate response characteristics for each application
3Measurement precision
If multiple films are used to detect different acceleration levels, then the measurement precision increases, but the device complexity increases
Solution Approach 1:
The patent divides the sensing mechanism into multiple independent film compartments, each with different rupture thresholds. This segmentation allows simultaneous detection of multiple acceleration levels through a single sensor unit, providing differentiated measurement precision without requiring multiple separate sensors
Solution Approach 2:
The patent adds a dimensional aspect to acceleration detection by using multiple films oriented in different directions or with different rupture characteristics. This enables the sensor to detect and differentiate acceleration events along multiple axes or at multiple threshold levels within a single device structure
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
Provides a clear visual indication of excessive acceleration, enabling users to determine if a specific acceleration threshold has been met, applicable in various applications including protective gear and shipping.
Implementation Method 1
the force that is applied by the mass ruptures at least one film
Implementation Method 2
fluids to mix and change color
Data Source
AI summary
A sensing device includes a housing and at least one film extending across the housing. The at least one film divides the housing into a first compartment and a second compartment. At least one mass is disposed within the first compartment. The at least one mass id sized to rupture the at least one film. A fluid having a first color is disposed in the first compartment and a fluid having a second color is disposed in the second compartment.