A system (100) and method (300) of monitoring a powder-bed additive manufacturing process using a plurality of energy sources (120) is provided. A layer of additive powder (142) is deposited on a powder bed and is fused using a first energy source (250), a second energy source (120), or any other suitable number of energy sources (120). The electromagnetic energy emissions at a first melt pool (252) are monitored by a melt pool monitoring system (200) and recorded as raw emission signals. The melt pool monitoring system (200) may also monitor emissions from the powder bed using off-axis sensors (202) or from a second melt pool (262) using on-axis sensors (202), and these emissions may be used to modify the raw emission signals to generate compensated emission signals. The compensated emission signals are analyzed to identify outlier emissions and an alert may be provided or a process adjustment may be made when outlier emissions exceed a predetermined signal threshold.
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