Strain Measuring System Using Piezoelectric Isolation
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Solution Overview
Problem
Conventional strain detection systems face errors due to resistance changes caused by factors other than strain, such as temperature changes, self-heating, and time-related changes, and they consume more power to detect both strain and temperature resistance changes.
Innovation Solution
A strain measuring system incorporating a piezoelectric element and a resistor on an object, with a resistance detection circuit and a piezoelectric effect detection circuit, calculates strain by isolating resistance changes during strain events, reducing power consumption by using a piezoelectric effect detection circuit with lower power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature detection resistor is added to remove temperature change effects, then measurement precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts the temperature compensation function from a separate temperature detection resistor and integrates it into the strain detection resistor itself. By using a constant current source to supply the strain detection resistor, the system eliminates the need for a separate temperature detection resistor while maintaining the ability to compensate for temperature effects through the constant current characteristic.
Solution Approach 2:
The strain detection resistor is designed to serve multiple functions: it detects strain changes through resistance variation and simultaneously provides temperature compensation through its constant current characteristic. This multi-functional design eliminates the need for separate dedicated components for each function.
2Measurement precision
If both strain detection resistor and temperature detection resistor are used, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent removes the separate temperature detection resistor from the system and extracts its compensation function into the strain detection resistor's constant current characteristic. This eliminates redundant power consumption while maintaining temperature compensation capability.
Solution Approach 2:
The strain detection resistor is designed to perform both strain detection and temperature compensation functions simultaneously, eliminating the need for a separate temperature detection resistor and reducing overall power consumption.
3Measurement precision
If continuous resistance monitoring is performed to detect all resistance changes, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic sampling of the strain detection resistor's resistance values at predetermined time intervals rather than continuous monitoring. This periodic measurement approach maintains sufficient strain detection accuracy while significantly reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The constant current source provides a stable reference current that automatically compensates for temperature effects without requiring additional active control or continuous adjustment, enabling the system to maintain measurement precision with reduced power consumption.
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
Accurately measures strain while minimizing power consumption by effectively isolating strain-related resistance changes and reducing errors from temperature and other non-strain factors, achieving precise strain detection with reduced power usage.
Implementation Method 1
a piezoelectric element and a resistor provided on an object. The system also includes a resistance detection circuit to detect a change in resistance of the resistor, and a piezoelectric effect detection circuit to detect a piezoelectric effect of the piezoelectric element
Implementation Method 2
those using an electrical resistance method is widely used which detects strain from a change in resistance accompanying a deformation of resistor
Data Source
AI summary
A strain measuring system includes a piezoelectric element and a resistor provided on an object. The system also includes a resistance detection circuit to detect a change in resistance of the resistor, and a piezoelectric effect detection circuit to detect a piezoelectric effect of the piezoelectric element. A strain calculation circuit detects a strain changing time while the strain of the object is changing using a detection result from the piezoelectric effect detection circuit, calculates a change in resistance of the resistor during the strain changing time, and calculates a degree of strain of the object using a calculation result of the change in resistance.