Comparison of the 3 Main Double-Sheet Detection Sensors on the Market

With the development of industrial automation, automated material feeding has become standard in factories, and automatic feeding inevitably needs to solve the problem of overlapping sheet feeding. Below, Atonm compares three commonly used double-sheet detection solutions in the industry.

Weighing Sensor Solution

Advantages of Weighing:

The weighing solution remains common in industry and its main advantages include:

1. Suitable for various objects: the weighing solution works not only for metal sheets but also for many other objects such as bulk items, liquids, powders, etc.;

2. Low maintenance cost: due to its relatively simple structure, maintenance costs are comparatively low.

Disadvantages of Weighing:

1. Slow detection speed: typical detection speed is 15–25 pcs/min, so it is used on lines with lower speed requirements;

2. Requirements on object weight: very light objects (below device range) cannot be recognized; for very heavy objects costs increase significantly.

Ultrasonic Sensor Detection Solution

Ultrasonic sensors primarily use the shielding effect of workpieces on ultrasonic waves to detect double sheets.

Advantages of Ultrasonic Double-Sheet Detection:

1. Fast detection speed: ultrasonic double-sheet detection can quickly measure single vs. double sheets of metal;

2. Suitable for various materials: ultrasonic detection applies to metal and other materials for thickness measurement, such as glass and ceramics.

Disadvantages of Ultrasonic Double-Sheet Detection:

1. Inaccurate for perforated or laminated sheets: the principle relies on ultrasonic shielding values, and lamination may affect readings;

2. Inaccurate for thick objects: ultrasonic sensors work by emitting waves and measuring echoes. Thick objects may require more time for waves to pass and return, causing detection errors. Different materials have different reflectivity; for some materials (e.g., foam or cork) reflections are poor, leading to inaccurate distance or position measurements.

Magnetic Induction Metal Double-Sheet Detection

The magnetic induction metal double-sheet detector uses differences in magnetic shielding among metal materials to detect stacked sheets.

Metal Double-Sheet Detector Advantages:

1. High detection accuracy: metal double-sheet detectors can precisely detect stacking issues in metal materials and identify problems that ultrasonic detection may miss;

2. Fast detection speed: metal detectors can quickly distinguish single and double sheets across different thicknesses, coatings, or oil contamination without being affected;

3. Non-contact detection: this is a non-contact technique that does not damage metal materials;

4. Easy operation: operation is simple—place the metal sheet under the probe to scan and obtain results quickly, achieving up to 1200 detections per minute;

5. Wide applicability: suitable for various metal sheets regardless of weight or shape, whereas weighing solutions may require additional handling considerations.

Disadvantages of Metal Double-Sheet Detectors:

1. Can only detect metal sheets: because it is based on electromagnetic induction, it cannot detect non-metal materials.

Atonm's metal double-sheet detectors are industry-leading products with high stability and strong anti-interference performance. They are widely used in metal coating, can-making, printing, metal packaging, home appliance stamping, and other industries, and support robotic automatic loading/unloading to improve production efficiency and reduce labor costs. They are reliable, high-quality detection devices.

Metal Double-Sheet Detector 1000B

Atonm's metal double-sheet detector uses advanced double-sheet sensing technology to quickly and accurately detect single vs. double metal sheets with high speed and accuracy. The device is stable and anti-interference, adapts to different environments, and supports remote monitoring to improve production efficiency.