Handgun Shot Counting via Three-Axis Acceleration Analysis
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Solution Overview
Problem
Existing handgun shot count systems are unreliable due to manipulation risks and design alterations, as they primarily rely on piezoelectric or acceleration sensors that can be affected by mechanical impulses other than recoil, such as dropping the pistol.
Innovation Solution
Implementing an acceleration sensor that detects movements in three spatial directions (X, Y, Z) to analyze the entire movement sequence post-firing, combined with a piezoelectric sensor for recoil impulse detection, using reference values to differentiate between firing and other mechanical impulses, and storing data in a memory for accurate shot counting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piezoelectric sensor is used to detect recoil impulse for shot counting, then the shot count can be recorded, but the system is vulnerable to manipulation and false detection from non-firing mechanical impulses
Solution Approach 1:
The patent transitions from single-axis piezoelectric sensor detection to three-axis acceleration sensor detection. By measuring acceleration in X, Y, and Z directions simultaneously, the system captures the complete spatial movement pattern of the pistol, enabling differentiation between legitimate firing sequences and manipulation attempts through multi-dimensional analysis of the movement signature.
Solution Approach 2:
The shot detection process is segmented into distinct temporal phases: recoil impulse detection, slide movement detection, and follow-up movement analysis. Each phase generates separate signal components that are analyzed independently and combined to form a comprehensive shot verification, preventing false detection from single-impulse events.
2Reliability
If the shot counter is positioned in front of the trigger, then shot counting is enabled, but the construction and design of the pistol is altered and manipulation becomes easier
Solution Approach 1:
The acceleration sensor module serves multiple functions: it detects recoil impulses, tracks slide movement, analyzes follow-up movements, and verifies shot authenticity. This multi-functional approach eliminates the need for separate shot counter positioning while maintaining security, as the same sensor system handles both detection and verification tasks through software-based analysis.
3Measurement precision
If a single-axis sensor is used for shot detection, then the device is simple, but it cannot differentiate between firing and other mechanical impulses
Solution Approach 1:
The system employs three-axis acceleration sensing to capture movement in multiple spatial dimensions. Legitimate firing produces a characteristic three-dimensional movement pattern involving recoil, slide movement, and follow-up motion, while manipulation or dropping the pistol creates different spatial signatures. This dimensional expansion enables reliable differentiation without significantly increasing hardware complexity.
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
Enhances shot count reliability by accurately differentiating between firing and non-firing mechanical impulses, reducing manipulation risks and providing comprehensive data on firearm handling, including incorrect usage detection, with temperature-independent and robust sensor solutions.
Implementation Method 1
A pistol having a piezoelectric sensor, which outputs a signal to the microprocessor upon picking up the recoil impulse during firing
Implementation Method 2
an acceleration sensor, which detects the acceleration of the firearm after firing in all three spatial directions, i.e., in the X, Y, and Z axes
Data Source
AI summary
A handgun having a device for ascertaining the shot count has electronics having a microprocessor (18) and a memory which may be read out, as well as an acceleration sensor (22), which detects the acceleration of the firearm in at least one spatial direction. Reference values for the intensity curve of the acceleration measured by the acceleration sensor (22) upon firing the weapon are stored in the memory. The microprocessor (18) is designed in such a way that it outputs a count pulse to the memory in the event of positive comparison of an intensity curve of the acceleration measured using the acceleration sensor to the reference values stored in the memory.