Boehmite detection and warning system, and concentration indicator for LiB separator sheet manufacturing

A method, comprising:

• receiving one or more x-rays signals that are transmitted through a coated separator membrane that includes ceramic coating;
• obtaining, by a processor, infrared (IR) signals from the coated separator membrane with a first peak for the coated separator membrane and a second peak from a contaminant or additive;
• determining, by the processor, whether the second peak is present from the IR signals, wherein the processor determines a type of the contaminant or additive that is present in the ceramic coating within the coated separator membrane;
• and
• calculating, by the processor, a concentration of the contaminant or additive from the second peak and a concentration of the ceramic coating from the one or more x-ray signals.

A system, comprising:

• an x-ray transmitter configured to generate an x-ray signal;
• an infrared transmitter configured to generate infrared (IR) signals;
• an x-ray sensor configured to receive the x-ray signal transmitted from the x-ray transmitter through a coated separator membrane;
• a top scanner head and a bottom scanner head configured to:
• receive the infrared (IR) signals from the infrared transmitter through the coated separator membrane, wherein the IR signals include two or more spectral components including peaks that include a first peak;
• a processor configured to:
• determine whether a second peak among the peaks is present, and determine, based on the presence of the second peak, a presence of a contaminant or additive in a coating present within the coated separator membrane;
• and
• a memory configured to store a calculated concentration or area weight of the contaminant or additive and a weight, density, or thickness of the coating based on the x-ray signal.