The NDC Infrared Model 360 Eddy Current scanning caliper sensor is designed for on-line thickness measurement of continuous web processes. The measurement is always representative of actual product thickness and inherently insensitive to product composition, color or density changes. The NDC Infrared Model OSA family of O-Frame scanners provides the ultimate in high speed traversing for the Model 360 measurement sensors.
Scanners are compact and offered for a full range of web widths.
A magnetic field is created between the upper and lower sensor heads, which in turn creates a voltage that precisely relates to the distance between the two heads. This is connected to the local demodulator electronics unit that produces a linear voltage output proportional to the sensor separation. This voltage is then converted into a differential frequency signal proportional to voltage. This conversion is done in the sensor head demodulator to insure a noise free signal and is then sent on to the gauge electronics for processing in the system display and control console.