Thermal Analysis Device Multi-Amplifier Force Signal Generator
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Solution Overview
Problem
Existing thermal analysis devices struggle to accurately measure materials with a wide range of elastic modulus, from high to low, due to the proportional increase in load resolution as maximum load increases, leading to decreased measurement accuracy at low loads.
Innovation Solution
The thermal analysis device incorporates a force signal generator with multiple D/A converters and amplifiers, allowing the maximum load to be varied and different load resolutions to be set without changing the digital resolution of the D/A converters, thereby enabling accurate measurement of both high and low elastic modulus materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the maximum load is increased to measure high elastic modulus materials, then the measurement capability for high elastic modulus materials is improved, but the load resolution deteriorates leading to decreased measurement accuracy at low loads
Solution Approach 1:
The force signal generator is divided into multiple D/A converters and multiple amplifiers with different amplification factors. This segmentation allows the system to select appropriate amplification levels for different measurement ranges, thereby maintaining both high load capacity and high load resolution simultaneously.
Solution Approach 2:
The system dynamically switches between different amplifiers with different amplification factors based on the measurement requirements. For high elastic modulus materials requiring large loads, a lower amplification factor is selected, while for low elastic modulus materials requiring precise low load measurements, a higher amplification factor is selected. This dynamic adaptation resolves the contradiction between maximum load capability and load resolution.
2Measurement precision
If the digital resolution of the D/A converter is increased to improve load resolution, then the measurement accuracy is improved, but the device cost increases significantly
Solution Approach 1:
Instead of changing the digital resolution of the D/A converter, the system changes the amplification factor of the amplifiers. This parameter change approach achieves different load resolutions using the same D/A converter, avoiding the need for expensive high-resolution D/A converters while maintaining measurement accuracy across different load ranges.
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
This configuration allows for precise measurement of materials with varying elastic modulus by adjusting the amplification factors of the amplifiers, thereby maintaining high measurement accuracy across a wide range of loads.
Implementation Method 1
an AC force is generated by electromagnetic cooperation between the coil and a magnet provided around the coil
Data Source
AI summary
Disclosed is a thermal analysis device including a probe for applying a load to a sample S, a force generator for generating and applying a force to the probe, displacement detectors for detecting the displacement of the probe to measure the mechanical properties of the sample, a force signal generator for generating a force signal to activate the force generator, a load detector for detecting a load applied to the sample, and furnaces for heating the sample. The force signal generator includes a digital signal generator that generates a digital signal of the force signal, multiple D/A converters that convert the digital signals into analog signals, and multiple amplifiers that amplify each of the analog signals output from the respective D/A converters by different amplification factors. The force signal generator outputs the analog signal amplified by at least one of the multiple amplifiers as the force signal.