Piezoelectric Sensor Polarization Control for Sensitivity Stability
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Solution Overview
Problem
Piezoelectric sensor devices experience degradation in piezoelectric properties over time due to residual stress and static electricity, leading to unstable polarization states that affect receiving sensitivity.
Innovation Solution
A piezoelectric sensor device with a controller that acquires characteristics values, determines the stability of the piezoelectric body's polarization state, and applies polarization processing when unstable, thereby maintaining or restoring stable states and reducing unnecessary processing and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarization processing is performed continuously to maintain stable piezoelectric properties, then receiving sensitivity is maintained, but power consumption increases and processing efficiency decreases
Solution Approach 1:
The patent implements periodic polarization processing based on elapsed time thresholds. The controller determines whether to apply polarization voltage based on whether a predetermined time threshold has elapsed since the last polarization processing, rather than applying it continuously. This periodic approach maintains piezoelectric stability while reducing unnecessary power consumption.
Solution Approach 2:
The patent uses feedback control by monitoring the elapsed time and comparing it against predetermined thresholds to determine when polarization processing is needed. The controller receives feedback about the current state (time since last processing) and adjusts its action (applying or not applying polarization voltage) accordingly, optimizing both reliability and energy efficiency.
2Stability of the object's composition
If polarization processing is performed frequently to prevent degradation, then piezoelectric properties remain stable, but processing time and system complexity increase
Solution Approach 1:
The system performs polarization processing periodically based on time thresholds rather than continuously or frequently. By setting predetermined time intervals, the system maintains polarization stability while minimizing the total processing time required, avoiding unnecessary repeated processing.
Solution Approach 2:
The controller preliminarily determines whether polarization processing is needed by checking the elapsed time before actually applying the polarization voltage. This preliminary check prevents unnecessary processing and optimizes the timing of actual polarization applications, reducing overall processing time.
3Reliability
If polarization processing is applied to all piezoelectric bodies regardless of state, then all maintain stable properties, but unnecessary processing increases power consumption and reduces efficiency
Solution Approach 1:
The patent applies polarization processing selectively to only those piezoelectric bodies that need it, based on individual elapsed time measurements. Rather than uniformly processing all piezoelectric bodies, the controller evaluates each one's specific state and applies processing only where necessary, improving overall processing efficiency while maintaining reliability.
Solution Approach 2:
Each piezoelectric body effectively serves its own monitoring function through the elapsed time tracking system. The system automatically determines which piezoelectric bodies need processing based on their individual time since last processing, enabling selective and efficient maintenance without requiring external intervention or uniform treatment of all components.
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 effectively prevents degradation of piezoelectric properties by controlling polarization processing based on the stability of the piezoelectric body, ensuring consistent receiving sensitivity and reducing power consumption.
Implementation Method 1
polarization processing in which polarization voltage is applied to the piezoelectric element
Implementation Method 2
piezoelectric body and a pair of electrodes sandwiching the piezoelectric body
Data Source
AI summary
A piezoelectric sensor device includes a piezoelectric element, a polarization processing unit and a controller. The piezoelectric element has a pair of electrodes sandwiching a piezoelectric body. The polarization processing unit is configured to execute polarization processing in which polarization voltage is applied to the polarization element. The controller is configured to control an execution timing of the polarization processing by the polarization processing unit, and includes a characteristics value acquisition unit configured to acquire a characteristics value relating to a polarization volume of the piezoelectric body, a determination unit configured to determine whether a polarization property is in a stable state or in an unstable state based on the characteristics value, and a polarization controller configured to control the polarization processing unit to apply the polarization voltage to the piezoelectric body when the determination unit determines that the polarization property of the piezoelectric body is in the unstable state.