1. Overview

Light curtains are photoelectric sensing devices used to protect personnel and equipment in industrial automation systems. They consist of transmitters and receivers that project and detect light beams to create a protective field. When an object interrupts the beam, the system triggers a safety response (e.g., stopping machinery). These devices are critical in modern manufacturing for compliance with safety standards (e.g., ISO 13849-1) and reducing workplace injuries.

2. Main Types and Functional Classification

3. Structure and Components

Typical components include:

• Transmitter: Emits modulated infrared or visible light
• Receiver: Detects beams using photodiodes
• Controller: Processes signals and triggers safety outputs
• Enclosure: IP-rated housing for environmental protection

4. Key Technical Specifications

5. Application Fields

Key industries and equipment:

• Automotive manufacturing (robotic arms)
• Metalworking machinery (lathes, presses)
• Food processing equipment
• Packaging machines
• Assembly lines

6. Leading Manufacturers and Products

7. Selection Recommendations

Key considerations:

• Determine required safety category (ISO 13849-1)
• Assess detection distance vs. resolution needs
• Environmental factors (dust, temperature, vibration)
• Integration with existing safety systems
• Mounting options (fixed vs. adjustable brackets)

Industry Trends Analysis

Emerging trends include:

• Integration with IIoT for predictive maintenance
• AI-enhanced beam algorithms for reduced false triggers
• Miniaturization for collaborative robot applications
• Wireless safety protocols (e.g., Safety over EtherCAT)
• Increased adoption in AGV obstacle detection

Real-world Application Case

In automotive assembly, SICK's OT series light curtains were implemented at a German plant to protect robotic welding cells. The system reduced unplanned downtime by 40% while maintaining SIL-3 safety compliance.