Carrier monitoring system and method thereof

A carrier monitoring method, comprising:

• providing a plurality of carriers and a reflow oven, wherein each of the plurality of carriers comprises a plurality of bumps disposed on a bottom thereof for identification of different carriers, and the reflow oven comprises a conveyor, a processing module and a database, and there is a plurality of sensing units disposed on the conveyor in an array arrangement, the database stores a plurality of identification codes for identification of the different carriers;
• carrying and positioning at least one circuit board by each of the plurality of carriers;
• when one of the plurality of carriers is placed on the conveyor, some of the plurality of sensing units on the conveyor are pressed by the plurality of bumps on the bottom of the carrier placed on the conveyor, and each of the pressed sensing units transmits a sensing signal to the processing module;
• obtaining, by the processing module, a carrier code according to the sensing signals;
• and
• determining, by the processing module, which carrier is placed on the conveyor according to the plurality of identification codes stored in the database and the carrier code;
• and
• monitoring the carrier placed on the conveyor.