| 摘要 |
Radiometric gage for contactless measurement of the surface density or the thickness of a flat product, includes: an X-radiation emitter, whose tube, is directed toward the flat product an X-radiation receiver, whose detector is disposed in order to receive X-radiation scattered or transmitted in attenuated form through said flat product, said receiver delivering a measurement signal a member for processing the measurement signal, in order to obtain information representing the surface density or the thickness of the flat product The anticathode of the tube is made of a material with atomic number as high as possible, preferably greater than 70, which is a good conductor of heat and has a high melting point. A member for adjusting the voltage (V) between the cathode and the anticathode is designed to operate in a predetermined range of relatively low voltages, in order to obtain, in conjunction with the anticathode, an X-ray emission spectrum essentially limited to continuous bremmstrahlung whose maximum energy is fixed by the value of the voltage (V) between cathode and anticathode.
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