A More Accurate Micro Accelerometer: A New Breakthrough in MEMS Technology

Accelerometers are essential core components in smart devices, automotive safety systems, and aerospace applications. They are responsible for sensing motion, vibration, and even orientation changes, directly affecting the safety and reliability of these systems.

Recently, a study based on MEMS (Micro-Electro-Mechanical Systems) technology proposed a novel asymmetric pendulum capacitive accelerometer, achieving significant performance improvements.

A MEMS accelerometer is a miniature sensor whose core principle is:When a device experiences acceleration, its internal microstructure undergoes displacement, which changes capacitance or voltage signals.By detecting these changes, the magnitude of acceleration can be calculated.

Traditional accelerometers mostly use symmetric structural designs. This study introduces a key innovation:Asymmetric proof mass structure

This design allows the sensor to:

• Produce displacement more easily (higher sensitivity)
• Achieve better structural stability
• Improve resistance to interference

Figure 1. Mechanical model of pendulum accelerometer

Experimental results show that this new sensor achieves:

• Sensitivity: 1.247 V/g (better detection of small changes)
• Nonlinearity: only 0.8%
• Stability: significantly better than traditional products

In simple terms:More accurate measurements, lower error, and more stable long-term performance

In addition to structural innovation, the study also optimizes several aspects:

• MEMS microfabrication processes (silicon etching + glass bonding)
• Damping optimization (reducing air effects)
• High-precision interface circuits (amplifying weak signals)

These technologies work together to achieve overall performance improvements.

Figure 2. Layout of the pendulum accelerometer.

This high-performance accelerometer can be used in:

• Automotive safety systems (airbag triggering)
• Industrial vibration monitoring
• Aerospace navigation systems
• Precision instrument attitude control

Researchers suggest future improvements may include:

• ASIC chip integration
• Higher-precision circuit design

These advancements could further enhance performance and enable greater miniaturization.