Calibration sample set and method for li-ion battery gauging systems

A method for preparing surrogate calibration standards for web gauging, the method comprising:

• providing linearizations for one or more radiometric gauges, each linearization associated with a radiometric gauge and relating the basis weight of real standards, comprising a lithium ion battery (LIB) electrode material, to transmission of the radiation through the LIB electrode material;
• providing one or more surrogate standards comprising an inert material having an effective Z (Zsurrogate) substantially the same as an effective Z (Zreal) of the LIB material in the real standards;
• positioning the surrogate standards in a sampling area of the radiometric gauges, wherein the surrogate standards are positioned one at time for each surrogate standard and each radiometric gauge;
• measuring transmission of radiation through the surrogate standards using the radiometric gauges, thereby providing a SS-transmission measurement for each surrogate standard measured and at each radiometric gauge;
• determining basis weights for each of the surrogate standards by selecting the basis weights for corresponding transmission measurements from the linearization for each of the radiometric gauges, thereby providing one basis weight for each surrogate standard and each radiometric gauge;
• and
• assigning to each surrogate standard an average of the determined basis weights for each surrogate standard measured at each radiometric gauge.