Application Cases

Experiment Name: Performance Testing of Intrinsic Flexible Magnetic Sensing Elements

Research Direction: Investigation of the influence of different MWCNTs mass percentages on the sensing characteristics of the element, testing of the element's sensing performance in noisy environments, and verification of the element's magnetic field measurement capability under bending conditions.

Experiment Objective:
The objective is to systematically evaluate the comprehensive sensing performance of intrinsic flexible magnetic sensing elements. The study determines the optimal material formulation by testing the sensitivity, linearity, and repeatability of elements with varying carbon nanotube content. By comparing the output characteristics of the elements in an electromagnetic shielding room versus a noisy environment, the impact of environmental interference on measurement accuracy is analyzed, identifying their limitations in anti-interference capability. Furthermore, by testing the element's performance under different bending states, the feasibility of its application for magnetic field measurement in confined, irregular curved spaces is ultimately verified. This provides a crucial basis for the subsequent design of anti-noise circuit systems.

Testing Equipment: Helmholtz coil, arbitrary waveform generator, ATA-304 power amplifier, oscilloscope, sampling resistor, intrinsic flexible magnetic sensing element.

Experimental Procedure:
First, flexible magnetic sensing elements with different MWCNTs mass percentages were prepared. A Helmholtz coil was used to generate a controllable alternating magnetic field. The static performance indicators, including sensitivity, linearity, and repeatability of each element, were systematically measured within an electromagnetic shielding room. Subsequently, the elements were placed in a real-world environment containing noise sources such as a stepper motor and an air conditioner to test their anti-interference capability and the nonlinear changes in their output characteristics. Finally, the elements were attached to the surfaces of beakers with different curvatures to measure their output characteristics under bending conditions, thereby comprehensively evaluating their practical sensing performance under various operating conditions.

Figure 1: Schematic Diagram of the Experimental Platform for Performance Testing of Intrinsic Flexible Magnetic Sensing Elements

Figure 2: Physical Image of the Experimental Platform

Experimental Results:

1. Optimal Material Formulation Determined: The element with 8% MWCNTs mass percentage exhibited the best overall performance in terms of sensitivity, linearity, and repeatability.

2. Adverse Effects of Noise Clarified: Environmental noise induced nonlinearity in the output characteristics of all tested elements and significantly reduced their sensitivity.

3. Bending Measurement Capability Verified: Although sensitivity decreased, the elements maintained good linearity under different bending states, proving their suitability for curved surface measurements.

4. Sensitivity Variation Pattern Revealed: The magnetic field sensitivity of the elements decreased as the MWCNTs mass percentage increased.

Figure 3: Output Characteristic Curves of Intrinsic Flexible Magnetic Sensing Elements with Different MWCNTs Mass Percentages Tested in a Noisy Environment vs. Inside a Shielding Room

Application Fields: Aerospace and Defense, Biomedical and Health Monitoring, Flexible Electronics and Robotics

Product Recommendation: ATA-304C Power Amplifier

Figure: ATA-304C Power Amplifier Specifications and Parameters