Piezoelectric Accelerometer Reciprocity Calibration for On-Site Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vibration sensors face challenges in regular calibration due to high costs in laboratory settings and a lack of feasible on-site calibration methods, making it difficult to ensure accuracy and sensitivity for on-site applications.
Innovation Solution
An on-site reciprocity calibration method for piezoelectric accelerometers is developed, utilizing a vibration exciting device and signal generator to measure electrical quantity ratios through vibration and reciprocity tests, enabling high-precision calibration by calculating sensitivity amplitudes of the drive and signal ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laboratory calibration methods (laser interferometry) are used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent introduces a vibration platform as an intermediary device to enable on-site calibration. The platform generates controlled vibrations that allow the accelerometer to be calibrated in field conditions rather than requiring complex laboratory equipment like laser interferometers. This mediator bridges the gap between portability needs and calibration accuracy requirements.
Solution Approach 2:
The patent replaces complex optical measurement systems (laser interferometry) with a mechanical vibration-based calibration approach. By using a vibration platform to generate known acceleration signals and measuring the electrical output of the accelerometer, the system substitutes sophisticated optical-mechanical systems with a simpler mechanical-electrical measurement chain suitable for on-site deployment.
2Measurement precision
If laboratory calibration methods are used, then measurement precision is improved, but loss of time and productivity decrease
Solution Approach 1:
The patent enables the accelerometer to be calibrated in its deployment environment without requiring transportation to a laboratory. The on-site calibration capability allows the device to self-calibrate or be quickly calibrated at the location of use, eliminating time-consuming logistics and enabling rapid deployment. This is particularly valuable for emergency monitoring applications where immediate calibration is needed.
3Ease of operation
If comparison method with reference sensor is used, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent changes the calibration approach from comparing sensor outputs to measuring the electrical quantity ratio (voltage output per unit acceleration) of the accelerometer. By using a vibration platform to generate known acceleration parameters and measuring the corresponding electrical output, the system achieves higher precision through parameter-based calibration rather than simple output comparison, while maintaining operational simplicity.
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 method achieves low-cost, efficient, and accurate on-site calibration with simple operation steps, suitable for various frequency ranges, and ensures high precision without complex mechanical measurements.
Implementation Method 1
a piezoelectric accelerometer with a drive port and a signal port
Data Source
AI summary
An on-site reciprocity calibration method for a piezoelectric accelerometer, including a vibration test and a reciprocity test. In the vibration test, a sine excitation with a corresponding frequency and amplitude is provided by a vibration exciting device to the piezoelectric accelerometer fixed on a motion plane, and output signals of a drive port and a signal port of the reciprocal piezoelectric accelerometer are collected by a data acquisition device. In the reciprocity test, a sine voltage excitation is provided by a signal generator to the drive port, and then an excitation signal and an output signal of the signal port are collected by the data acquisition device. An amplitude ratio of the two signals is obtained based on signal sine-fitting. Finally, the on-site calibration is enabled according the sensitivity amplitude ratio obtained in the vibration test and the sensitivity amplitude product obtained in the reciprocity test.