Abstract:
A material-treating process in which the percent weight of coating relative to the measured dry weight of a host material is computed. In application to resin-impregnating process, the percent volatiles in a sheet is computed by measuring the total weight of the dried sheet and computing the ratio of the weight of volatiles in the sheet to the measured total dried sheet weight. Radiation gauges are provided which respond to the weight per unit area of the sheet being measured and a dielectric measuring gauge that responds to the moisture content of the uncoated sheet.
Abstract:
Disclosed are a system and method for facilitating the setup of a nucleonic gauge and automatic controller for measuring and controlling the thickness of a material. The gauge includes conventional calibration circuits having variable voltage dividers set in accordance with the expected operating points for the material thickness center scale and gauge sensitivity. In one embodiment, the sensitivity and operating point voltage dividers as well as the automatic controller set-point voltage divider are set with the aid of an auxiliary bridge including additional voltage dividers ganged with the voltage dividers of the gauge calibration circuits. In another embodiment, one of the auxiliary bridge voltage dividers has a logarithmic response, enabling calibration for different materials to be established by changing the input voltage to the auxiliary bridge.
Abstract:
Disclosed are a system for and method of standardizing the frequency response of a plurality of thickness measuring radiation gauges, having resistance capacitance networks connected to the outputs thereof. Each gauge is source and zero standardized by adjusting a potentiometer in the feedback loop of an amplifier and the zero point of the amplifier, respectively. Thereafter, each gauge is frequency standardized by adjusting the time constant of frequency determining impedances. The determination of the frequency response of each gauge is made by modulating the gauge characteristics and measuring the reduction in amplitude of the gauge output relative to D.C.
Abstract:
An error signal filtering technique for a control system wherein the rejection or cutoff bands of a filter circuit are shifted in accordance with the speed of the material being controlled. In one embodiment, the error signal from a thickness gauge is averaged over several complete cycles of a predominant uncontrollable frequency component. In another embodiment, an average value of an error signal from a sheet scanning gauge is provided for one or more zones extending down the length of the sheet by controlling the scanning speed of the gauge to provide signal integration over complete cycles of the predominant frequency component.