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| Gamma Backscatter SensorModel 100
A family of nucleonic sensors for the online measurement of thickness or weight of continuous web products. The sensors feature one-sided measurement, digital design, small size, simplicity and exceptional long-term stability and accuracy.
In the spectrum of nucleonic type thickness and weight gauges, NDC Infrared Engineering is unique with its small, one-piece source/detector probe that makes the measurement from only one side of the sheet or web. The measurement technique is Compton Photon Backscatter, commonly called gamma backscatter (GBS). Compared with other gauging techniques, the GBS method offers a lower purchase cost, lower installed cost, and is much simpler in application which begets greater reliability. Features The NDC Infrared Engineering Gamma backscatter gauge operates on the principle of Compton Photon Backscattering. When gamma rays, or photons, are directed at material to be measured, many of the photons are scattered back, losing some of their energy in the process. These backscattered photons strike a 100% efficient scintillator detector which produces flashes of visible light. These flashes enter a photomultiplier tube (PMT) where they are converted to electrons and amplified.
Output from the PMT is a train of pulses whose height is proportional to the energy of the detected gamma photons, and whose pulse rate (pulses per second) is proportional to the mass (or weight per unit area) of the material being measured. Linearity and Ease of Calibration The basic linear response of the sensor combined with its relative insensitivity to changes in composition results in a unique ease of calibration. In most situations, a single response curve is all that is required. Offsets to the slope of the curve can be applied to optimize the gauge response for each specific product.
Technical Specifications of the Gamma Backscatter Sensors |
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