Detection device and system for measuring the thickness of a zinc layer on steel and measuring the iron content of a zinc layer

摘要

Determining device (50) which is adapted to measure the thickness of a zinc layer (18a) on an iron layer (18b) of a test object (18) and the iron portion (18c) in the zinc layer (18a) on the iron layer (18b) of the test object (18 ), comprising: - an X-ray source (2) emitting X-radiation (14) on the test object (18) with the zinc layer (18a) on the iron layer (18b); - A first fluorescence detection means (4, 4 ') which determines a first fluorescence radiation due to iron (18b) in the test object (18), which is scattered at a first angular segment of the test object (18); - Compton detection means (6, 6 '), which detects a Compton scattering due to iron (18b) in the test object (18), which is scattered under a first angle segment of the test object (18); - Second fluorescence detection means (52, 52 ') which detects a second fluorescence radiation due to iron (18b, 18c) in the test object (18), which is scattered under a second angle segment of the test object (18); - Third fluorescence detection means (52, 52 ') which detects a third fluorescence radiation due to zinc (18a) in the test object (18), which is scattered under a second angle segment of the test object (18); and - a first evaluation device (24a) which is designed to determine the thickness of the zinc layer (18a) on the iron layer (18b) of the test object (18) from the first fluorescence radiation and the Compton scattering; and - a second evaluation device (24b) which is designed to determine the iron portion (18c) in the zinc layer (18a) from the first fluorescence radiation, the second fluorescence radiation and the third fluorescence radiation, characterized in that the Compton detection device (6 , 6 ') has a filter arrangement which is designed such that the radiation emitted by the test object (18) due to the Compton scattering passes through a nickel layer (10) and an iron layer (8) after being scattered by a test object (18) and before it is detected by a sensor of the Compton detection device (6, 6 ').