Diffuse reflection fiber optic sensor with protrusion tube

A diffuse reflection fiber optic sensor with a protrusion tube detects objects or surface characteristics by measuring light diffusely reflected from the target, with the protrusion tube enhancing alignment and protection.

Working Principle

A diffuse reflection fiber optic sensor operates by transmitting light through an optical fiber toward a target surface. When the light hits the object, part of it is diffusely reflected back to the sensor's receiver. The sensor then analyzes the intensity of the returning light to determine the presence, position, or surface characteristics of the object. This non-contact detection method is ideal for automated inspection, quality control, and environments with limited access .

Role of the Protrusion Tube

The protrusion tube (also referred to as a convex or extension tube) serves several purposes:

• Alignment: It helps focus the emitted light onto the target and ensures consistent reflection back to the receiver.
• Protection: Shields the fiber tip from dust, debris, or mechanical damage in harsh industrial environments.
• Adjustable Detection Range: Tubes of different lengths (e.g., 10, 20, 40, 90 mm) allow customization of the sensor's effective detection distance .

Design Features

• Fiber Options: Standard fiber lengths are typically 1 meter, with flexibility for multi-scenario layouts.
• Thread Sizes: Sensors often support M3, M4, or M6 threads for easy mounting.
• High Sensitivity: Capable of detecting small-diameter objects and subtle surface changes.
• Robust Construction: Some models include sapphire windows or high-temperature designs for harsh process conditions .

Applications

Diffuse reflection fiber optic sensors with protrusion tubes are widely used in:

• Automated assembly lines for part detection.
• Package inspection to verify presence or orientation.
• Quality control in manufacturing processes where direct access is limited.
• Process monitoring for liquids, powders, or other materials in industrial environments .

Installation and Adjustment

Installation is straightforward due to compact design and threaded mounting. The protrusion tube allows quick alignment and adjustment of the detection range without complex calibration. High flexibility in fiber routing ensures adaptability to various layouts . In summary, a diffuse reflection fiber optic sensor with a protrusion tube combines precise non-contact detection with enhanced protection and alignment, making it suitable for demanding industrial and laboratory applications .