Optical Motion Sensors

1. What are the Working Principles of Optical Motion Sensors?

An infrared LED emits a light beam and receives the reflected light. A CMOS image sensor or photodiode detects changes in the light spot’s displacement. A cross-correlation algorithm or inter-frame differencing method is used to calculate motion vectors, enabling submicron displacement detection. Typical sampling rates can reach 8000 FPS, with response latency less than 1ms.

 

2. What are the Core Types of Optical Motion Sensors?

Surface Reflective: Suitable for contact applications such as mice and touchpads.

Airborne: Suitable for contactless applications such as drone hovering and gesture recognition.

Laser Triangulation: Industrial-grade high-precision positioning (±0.1μm).

 

3. Key Parameters of Optical Motion Sensors

Indicators

Consumer Grade

Industrial Grade

Resolution

400-1600CPI

0.1μm

Acceleration

10g

50g

Power Consumption

3-5mA

15-30mA

 

4. Innovative Applications of Optical Motion Sensors

Medical: Surgical Robot Vibration Compensation

Automotive: Head-Up Display (HUD) Eye Tracking

IoT: Contactless Control Panels

 

5. Selection Recommendations for Optical Motion Sensors

Prioritize ambient light rejection (≥60dB) and temperature drift coefficient (<0.05%/°C). For harsh operating conditions, select products with IP67 protection.