Measurement methods using infrared (IR) camera techniques have been developed and evaluated, both in laboratorystudies, online on the FEX pilot paper machine, and at paper mills. The large advantage with the methods we developedfor applying the high-speed IR cameras on the paper machine is the ability to cover the whole width of the machine toview temperature changes over a longer period of time. The temperature changes can then be correlated to processvariations (i.e. moisture or material distribution) to obtain the local basis weight variation, to achieve more detailedinformation for an optimisation of the process.