Thermo Scientific™

X-Ray Master Sensor

Get accurate thickness and weight measurement data, control raw materials and improve the quality of products from films to fiberglass to nonwovens. The Thermo Scientific™ X-Ray Master Sensor provides non-contact, scanning measurement of weight, thickness or composition of a material on a continuous web. Using x-ray absorption characteristics, the sensor delivers precise, high-resolution measurement over a wide product range compared to nucleonic techniques.
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The digitally controlled power source of the X-Ray Master sensor enables it to be precisely tuned to measure specific material properties, allowing a wide range of products to be measured on the same line with a single sensor. 

A stable, high-flux, low-noise x-ray source is digitally tuned across the range of 10 to 30 keV depending on the material to be measured. The voltage is maintained to within ±2.0 V at 30 keV and the use of a low power x-ray tube eliminates the need for external cooling utilities. A robust calibration algorithm enables the easy addition of new products to maximize the benefits from optimization controls and return on investment, reinforcing the X-Ray Master as a simple, cost-effective solution.

The X-Ray Master is available in four application-specific sensor models.

Model S-XRAY0-00 sensor is designed for use with film and sheet products. Its 4 mm source footprint is capable of detecting 1.25 mm streaks, a feature that is also invaluable for edge bead characterization on biaxial orientated film and sheet lines. Other applications include subtractive x-ray coat weight measurement.

Model S-XRAY0-01 sensor has a 40 mm gap designed for use on specialty nonwoven applications. 

Model S-XRAY0-02 sensor has a 600 mm wide gap for fiberglass and other building product applications.

Model S-XRAY0-03 sensor has a 300 mm wide gap for float glass applications.

A full suite of maintenance displays for calibration, accuracy verification and diagnostics supports the sensors. As x-ray measurements are non-nuclear, they are not subject to the regulations surrounding the use or disposal of nucleonic sources. Generally, x-ray measurements require minimal shielding due to their low operating energy levels. In addition, there is no deterioration of the signal over time, nor is there a radiation hazard once the sensor is powered down. Each material is linked to its specific x-ray power profile through the system’s recipe management.


  • High signal-to-noise x-ray source tube
  • Low-power x-ray tube
  • Thermo-electrically cooled x-ray tube
  • Digitally-tuned x-ray source
  • Non-nuclear sensor
  • Minimum radiation shielding requirements
  • High-speed thermopile air gap temperature measurement
  • High-resolution measurement capability


  • Cast film
  • Biax
  • Extruded film and sheet
  • Nonwovens
  • Insulating materials
  • Coat weight
  • Calcium carbonate
  • Titanium dioxide