Piezoelectric Electric Field Sensing via Frequency Shift
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Solution Overview
Problem
Existing electrical field detectors are bulky, expensive, and energy-consuming, and they often produce biased measurement results due to the use of electrical fields to vibrate MEMS devices, and require high-resolution analog-to-digital converters.
Innovation Solution
A compact electrical field detector using a piezoelectric oscillator with an electromechanical oscillator, frequency measuring device, and an electrical masking assembly, where the piezoelectric element vibrates relative to the masking assembly, allowing the electrical field to change the oscillation frequency measured by the frequency device, eliminating the need for generating biasing electrical fields and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electrical field detectors with movable masks and electrodes are used, then measurement capability is achieved, but the device becomes bulky, expensive, and energy-consuming
Solution Approach 1:
The patent replaces the traditional mechanical/electrical detection system (electrodes, movable masks, analog-to-digital converters) with a piezoelectric oscillator-based system. The piezoelectric element converts electrical field effects directly into oscillation frequency changes, eliminating the need for complex mechanical structures and high-resolution converters.
Solution Approach 2:
The patent changes the measurement parameter from electrical current (requiring analog-to-digital conversion) to oscillation frequency (easily measurable with simple electronics). The electrical field's effect on the piezoelectric element manifests as frequency shifts, which are more straightforward to measure and process.
2Measurement precision
If electrical fields are used to vibrate MEMS devices for measurement, then detection is enabled, but measurement biases are introduced
Solution Approach 1:
The patent introduces a piezoelectric element as an intermediary between the electrical field and the measurement system. This intermediary converts the electrical field's effect into mechanical vibration and then into an electrical signal, avoiding direct interaction that causes bias while maintaining detection capability.
Solution Approach 2:
Instead of using electrical fields to directly vibrate the sensor (which causes bias), the patent uses the piezoelectric effect in reverse: the electrical field affects the piezoelectric element's mechanical properties, which then generates an measurable electrical signal through its vibration characteristics.
3Measurement precision
If high-resolution analog-to-digital converters are used for charge evaluation, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The patent replaces the energy-intensive analog-to-digital conversion process with a direct frequency measurement approach. Frequency can be measured with simple digital counters or timer circuits that consume minimal power, eliminating the need for high-resolution ADCs.
Solution Approach 2:
The patent uses periodic oscillation of the piezoelectric element to encode the measurement information in frequency rather than amplitude. Frequency measurement of periodic signals is inherently more energy-efficient than continuous high-resolution analog-to-digital conversion, as it requires only timing measurements.
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 accurate, reliable, and cost-effective electrical field measurements, suitable for applications like aircraft and satellites, with reduced energy consumption and no bias in measurement results.
Implementation Method 1
an electromechanical oscillator, of which at least part is comprised of a piezoelectric element intended to vibrate at an oscillation frequency during an use of the detector
Implementation Method 2
The electrical field to be measured, which acts on the exposed and variable part of piezoelectric element during the use of the detector, produces a change in the oscillation frequency
Data Source
AI summary
An electrical field detector includes an electromechanical oscillator, part of which is included of a piezoelectric element, a frequency measuring device which is coupled to the oscillator so as to measure the oscillation frequency, and an electrical masking assembly. The electrical masking assembly is arranged close to the piezoelectric element so that, during an use of the detector, the piezoelectric element moves by vibrating relative to the electrical masking assembly. A variable part of the piezoelectric element is thus exposed to the electrical field to be measured. A change in the oscillating frequency then forms an electrical field measurement result.