Roller Accelerometer with Optical Sensing for Weak Signal Detection
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Solution Overview
Problem
Conventional piezoelectric accelerometers are expensive, complex, and prone to malfunction in uncontrolled environments, with limited sensitivity to weak signals and susceptibility to external disturbances.
Innovation Solution
A roller-based accelerometer utilizing optical sensors and a transparent enclosure to measure acceleration through angular deflection of a roller, allowing precise detection of even small accelerations with minimal external interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If piezoelectric accelerometers are used to measure acceleration, then measurement capability is provided, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent replaces the piezoelectric material-based mechanical sensing system with a simple mechanical roller oscillation system. The roller of known mass oscillates on a frictionless pivot, and its angular displacement directly indicates acceleration magnitude, eliminating the need for complex piezoelectric materials and electrical signal processing while maintaining measurement capability
Solution Approach 2:
The patent extracts and eliminates the complex piezoelectric material component from the accelerometer system. By using only a simple roller, pivot, and enclosure, the invention removes the expensive and complex piezoelectric sensing mechanism while retaining the essential acceleration measurement function through purely mechanical means
2Measurement precision
If piezoelectric accelerometers are used to measure acceleration, then measurement capability is provided, but manufacturing cost increases
Solution Approach 1:
The patent employs inexpensive mechanical components - a simple roller of known mass, a frictionless pivot, and an enclosure - replacing expensive piezoelectric materials. These simple mechanical parts are much cheaper to manufacture and do not require specialized material synthesis or complex assembly processes
Solution Approach 2:
The invention substitutes the expensive piezoelectric material system with inexpensive mechanical components. The roller-pivot mechanism uses only basic mechanical elements that are readily available and inexpensive, eliminating the need for costly piezoelectric material procurement and processing
3Measurement precision
If piezoelectric accelerometers are used in controlled environments, then measurement accuracy is maintained, but adaptability to harsh environments is reduced
Solution Approach 1:
The patent replaces the piezoelectric material-based system with a purely mechanical roller oscillation system that is inherently resistant to electromagnetic interference, dust, and other environmental disturbances. The mechanical roller's angular displacement can be read optically or mechanically, providing robust measurement capability in harsh environments where electronic piezoelectric sensors would malfunction
Solution Approach 2:
The patent converts the potential harm of external disturbances (electromagnetic fields, dust) into a benefit by using a mechanical system that is naturally immune to these factors. The simple mechanical roller-pivot system operates reliably in harsh environments where electronic sensors would fail, turning the limitation of mechanical systems into an advantage for environmental robustness
4Measurement precision
If piezoelectric material sensitivity is increased to detect weak signals, then weak acceleration signals can be detected, but the system becomes more susceptible to external disturbances
Solution Approach 1:
The patent replaces the piezoelectric material system with a mechanical roller oscillation system where the roller's angular displacement directly reflects acceleration magnitude. This mechanical system can detect weak acceleration signals through precise angular measurement while being inherently immune to electromagnetic interference and other external disturbances that affect piezoelectric materials
Solution Approach 2:
The invention converts the potential susceptibility of sensitive piezoelectric materials to external disturbances into an advantage by using a mechanical system that is naturally robust. The roller-pivot mechanism's insensitivity to electromagnetic fields and dust becomes a beneficial feature that enables reliable operation in harsh environments while maintaining the ability to detect weak acceleration signals through precise angular displacement measurement
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
The solution provides improved sensitivity, accuracy, and cost-effectiveness with simplified construction, enabling reliable and portable measurements in various environments.
Implementation Method 1
the roller is opaque and prevents light from being incident on the plurality of sensors
Implementation Method 2
A bearing is rotatably housed in the hub
Data Source
AI summary
A roller-based accelerometer (100) is disclosed and includes an enclosure (1). A hub (2) is defined at a center of the enclosure (1), concentric to an inner surface (1a) of the enclosure (1). A bearing (3) is rotatably housed in the hub (2). An arm (4) is fixedly connected to the bearing (3). The arm (4) is configured displace within the enclosure (1). A plurality of sensors (6) is mounted on the enclosure (1). A roller (5) is positioned at a free end of the arm (4), contacting the inner surface (1a) of the enclosure (1). The roller (5) traverses the inner surface of the enclosure and over the plurality of sensors (6). The arm (4) angularly oscillates when the accelerometer (100) is accelerated and is dependent on the position of the roller (5) over one of the plurality of sensors (6) to indicate the acceleration of the accelerometer (100).