Spring Inductance Sensing With Oscillator-Based Status Detection
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Solution Overview
Problem
Conventional methods for determining the status of spring-based elements in small-scale mechanical devices, such as wearable medicament delivery devices, are unreliable due to interference and noise, and the low inductance range of spring elements in these devices makes accurate detection challenging without additional amplification components.
Innovation Solution
The use of an amplifier device, such as a magnetic material within the internal space of the spring, to amplify the inductance of spring elements, combined with a simple sensing circuitry that includes an electronic oscillator like a Colpitts oscillator, allows for reliable detection of spring status without requiring additional space or complex components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional measurement methods are used to detect spring inductance, then the device structure remains simple, but the measurement reliability deteriorates due to interference and noise
Solution Approach 1:
The patent introduces an intermediary amplification circuit between the spring element and the sensing circuit. This intermediary component (amplifier) boosts the weak inductance signal from the small spring to a detectable level, enabling reliable measurement without requiring the spring to be physically larger or the sensing circuit to be more complex
2Volume of moving object
If the spring element size is reduced for wearable devices, then the device footprint is minimized, but the detectable inductance range becomes too low for meaningful status information
Solution Approach 1:
The patent changes the electrical parameters of the spring element by incorporating it into an oscillating circuit. By measuring the oscillation frequency rather than direct inductance, the system can detect status information from springs with very low inductance values, effectively overcoming the limitation of small spring sizes
Solution Approach 2:
The patent replaces direct mechanical measurement of spring status with an electrical oscillation-based detection system. Instead of measuring inductance directly (which fails for small springs), the system uses the spring's mechanical motion to modulate an electrical oscillation, converting mechanical status into detectable electrical frequency changes
3Reliability
If conventional sensing circuitry is used without amplification, then the device complexity is minimized, but the ability to detect spring status in small-scale devices becomes unreliable
Solution Approach 1:
The patent merges the spring element with the sensing circuit by integrating the spring into an oscillating circuit. This combination allows the spring's mechanical status to directly influence the electrical oscillation, creating a self-contained sensing system where the spring itself participates in the measurement process rather than being a separate passive component
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 enables accurate and reliable determination of spring status in small-scale devices, facilitating effective control of fluid delivery pumps and ensuring patient safety by monitoring device operations and handling errors.
Implementation Method 1
the inductance of a spring varies in inverse proportion to its length
Implementation Method 2
The use of an amplifier device, such as a magnetic material within the internal space of the spring, to amplify the inductance of spring elements
Data Source
AI summary
Spring-based sensor devices are described. For example, a spring-based sensor system may include at least one spring associated with a mechanical element, the at least one spring operative to change from a first state to a second state based on a configuration of the mechanical element, sensing circuitry configured to determine an electrical property of the at least one spring, the electrical property to have a first value when the at least one spring is in the first state and a second value when the at least one spring is in the second state, and a logic device to determine a status of the mechanical element based on the electrical property. Other embodiments are described.