Multi-detector EDXRD
A method for analysis of a sample includes irradiating an area of the sample with a polychromatic X-ray beam. X-rays scattered from the sample are detected using a plurality of detectors simultaneously in different, respective positions, whereby the detectors generate respective outputs. Energy-dispersive processing is applied to the outputs of the detectors so as to identify one or more X-ray diffraction lines of the sample.
1. A method for analysis of a sample, comprising:
irradiating an area of the sample with a polychromatic X-ray beam;
detecting X-rays scattered from the sample using a plurality of detectors simultaneously in different, respective positions, whereby the detectors generate respective outputs;
applying energy-dispersive processing to the outputs of the detectors so as to identify one or more X-ray diffraction lines of the sample; and
using the one or more X-ray diffraction lines to determine a crystalline structure of the sample.
2. The method according to claim 1 , wherein irradiating the area comprises focusing the X-ray beam to irradiate a spot on the sample.
3. The method according to claim 1 , wherein irradiating the area comprises directing the X-ray beam to impinge on a surface of the sample in a direction normal to the surface.
4. The method according to claim 1 , wherein irradiating the area comprises directing the X-ray beam to impinge on a surface of the sample at a non-normal angle relative to the surface.
5. The method according to claim 1 , wherein detecting the X-rays comprises arranging two or more of the detectors to detect the scattered X-rays at different azimuths and equal elevation angles relative to a surface of the sample.
6. The method according to claim 5 , wherein applying the energy-dispersive processing comprises determining respective counts of X-ray photons incident on each of the two or more of the detectors at an X-ray energy corresponding to at least one of the X-ray diffraction lines, and summing the respective counts.
7. The method according to claim 1 , wherein detecting the X-rays comprises arranging two or more of the detectors to detect the scattered X-rays at different, respective elevation angles relative to a surface of the sample.
8. The method according to claim 7 , wherein applying the energy-dispersive processing comprises determining respective counts of X-ray photons incident on each of the two or more of the detectors at respective X-ray energies for which the respective elevation angles correspond to Bragg angles of the sample.
9. Apparatus for analysis of a sample, comprising:
an X-ray source, which is operative to irradiate an area of the sample with a polychromatic X-ray beam;
a plurality of detectors in different, respective positions, which are arranged to detect simultaneously X-rays scattered from the sample and to generate respective outputs responsively to the detected X-rays; and
a processor, which is adapted to apply energy-dispersive processing to the outputs of the detectors so as to identify one or more X-ray diffraction lines of the sample.
10. The apparatus according to claim 9 , wherein the X-ray source comprises optics for focusing the X-ray beam to irradiate a spot on the sample.
11. The apparatus according to claim 9 , wherein the X-ray source is configured to direct the X-ray beam to impinge on a surface of the sample in a direction normal to the surface.
12. The apparatus according to claim 9 , wherein the X-ray source is configured to direct the X-ray beam to impinge on a surface of the sample at a non-normal angle relative to the surface.
13. The apparatus according to claim 9 , wherein two or more of the detectors are arranged to detect the scattered X-rays at different azimuths and equal elevation angles relative to a surface of the sample.
14. The apparatus according to claim 13 , wherein the processor is arranged to determine respective counts of X-ray photons incident on each of the two or more of the detectors at an X-ray energy corresponding to at least one of the X-ray diffraction lines, and to sum the respective counts.
15. The apparatus according to claim 9 , wherein two or more of the detectors are arranged to detect the scattered X-rays at different, respective elevation angles relative to a surface of the sample.
16. The apparatus according to claim 15 , the processor is arranged to determine respective counts of X-ray photons incident on each of the two or more of the detectors at respective X-ray energies for which the respective elevation angles correspond to Bragg angles of the sample.