Low-G Accelerometer Impact Detection from Saturation Duration
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Solution Overview
Problem
Electronic devices lack effective and cost-efficient methods to detect and characterize impacts, as conventional inertial measurement units and high-g accelerometers are either too expensive or consume excessive power for always-on impact detection.
Innovation Solution
Utilizing saturation data from low-g accelerometers to detect and characterize impacts by measuring saturation duration and direction, allowing for low-cost and low-power impact detection and characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inertial measurement units or high-g accelerometers are used to detect impacts, then impact detection precision is improved, but device cost and power consumption increase
Solution Approach 1:
The patent uses a low-g accelerometer that is inexpensive and low-power, accepting that it cannot directly measure high-g impacts. Instead, it detects saturation events and uses signal processing to infer impact characteristics, effectively using a cheap sensor to achieve the function of an expensive high-g accelerometer through clever algorithms
Solution Approach 2:
The patent introduces an intermediary approach by using the saturation data from the low-g accelerometer as a proxy for detecting high-g impacts. The saturation event itself becomes the intermediary signal that indicates an impact occurred, even though the actual high-g acceleration is not directly measured
2Measurement precision
If conventional inertial measurement units or high-g accelerometers are used to detect impacts, then impact detection precision is improved, but device cost increases
Solution Approach 1:
The patent replaces expensive high-g accelerometers with inexpensive low-g accelerometers, using cost-effective components to achieve the desired functionality through alternative measurement and processing approaches
Solution Approach 2:
The patent creates a virtual representation of high-g impact data by processing saturation events from the low-g accelerometer. Instead of directly measuring the high-g acceleration, it creates an equivalent impact characterization through algorithmic processing of the saturation signal
3Use of energy by moving object
If a low-g accelerometer is used to detect impacts, then power consumption is reduced, but measurement precision for high-g impacts deteriorates
Solution Approach 1:
The patent converts the harmful limitation of the low-g accelerometer (saturation during high-g impacts) into a beneficial detection signal. The saturation event, which would normally be considered a loss of measurement data, is instead used as the primary indicator that an impact has occurred, with the duration and characteristics of saturation providing impact characterization
Solution Approach 2:
The patent replaces direct mechanical measurement of high-g acceleration with an electronic signal processing approach. Instead of relying on the mechanical sensor to withstand and measure high-g forces, it uses electronic detection of saturation events and algorithmic processing to infer impact characteristics
4Ease of manufacture
If a low-g accelerometer is used to detect impacts, then device cost is reduced, but measurement precision for high-g impacts deteriorates
Solution Approach 1:
The patent uses an inexpensive low-g accelerometer as the primary sensor, accepting its limitations and compensating through software-based detection methods that extract meaningful impact information from saturation events
Solution Approach 2:
The saturation signal serves as an intermediary that bridges the gap between the low-g accelerometer's limited measurement capability and the need to detect high-g impacts. The saturation event mediates the transmission of impact information from the high-g environment to the low-g sensor
Data Source
AI summary
Techniques for detecting and characterizing impacts using saturation data of a low-g accelerometer are disclosed. A system for detecting impacts using a low-g accelerometer includes an accelerometer, one or more memory devices, and a processor. An acceleration measurement of an axis of the accelerometer that indicates that the axis is saturated is obtained. A direction of acceleration in the axis is obtained based on the acceleration measurement. A saturation period for the axis is determined. A determination of whether the saturation period satisfies a duration threshold is made. In response to the saturation period satisfying the duration threshold, an impact is detected and a record of the detected impact based on the direction of acceleration is stored in the one or more memory devices.