Single-Probe and Dual-Probe Metal Double-Sheet Detector: Principles and Applications

Part I — Atonm Dual-Probe Metal Double-Sheet Detector

(1) Working principle

The dual-probe Metal Double-Sheet Detector consists of a host and two probes. The T probe (transmit) generates an electromagnetic field; the R probe (receive) senses the field. Different metals shield the field differently, so when a metal sheet passes, the R probe's signal changes. The host compares the signal with learned references to determine single or double sheets.

(2) Applications

Dual-probe detectors are widely used in automated feeding lines across appliances (air conditioners, refrigerators, washing machines), metal packaging stamping, and other metal forming processes. They protect molds and reduce scrapped parts when paired with cutting, stamping, or robotic equipment.

Part II — Atonm Single-Probe Metal Double-Sheet Detector

(1) Working principle

The single-probe system uses one sensor to judge material thickness, integrating electromagnetic induction and eddy-current techniques. Changes in thickness alter the induced current; comparing signals with learned references yields no-material, single-sheet, or double-sheet outputs.

(2) Applications

Single-probe detectors are commonly used in automotive stamping for magnetic materials (iron, steel) and non-magnetic materials (aluminum) to prevent double feeding and protect molds.