椭圆形 SDD 模块
Racetrack SDDs: For large solid angle in Microanalysis in TEM
There is a limitation if only the active area of the SDD is increased. Therefore PNDetector invented the so called Racetrack chip structure. These SDDs make use of an oval shaped active area. Therefore, they can be placed extremely close to the sample even in applications where the available space is restricted. This leads to largely increased solid angles.
The Specific Oval Shaped SDD Series named Racetrack
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High resolution spectroscopy down to 126 eV @ Mn Kα, -30 °C
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Extreme close proximity to the sample with solid angles exceeding 1 sr
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Huge solid angles up to 2 sr are possible with dual configurations in TEM
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Mounted on a compact housing comprising non-magnetic materials
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Mostly used in “windowless” configuration – gives the highest detection efficiency for light elements
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![[Translate to Chinese:] EDX spectra of light-element samples measured in SEM with a windowless SDDplus-100 detector module operated at -45°C chip temperature](/fileadmin/_processed_/f/d/csm_oval_spektrum_sddplus100oval_li_al_c9db63ba59.jpg)
[Translate to Chinese:] EDX spectra of light-element samples measured in SEM with a windowless SDDplus-100 detector module operated at -45°C chip temperature
![[Translate to Chinese:] Energy resolution plotted against processing time measured with two different ´Racetrack SDDs´](/fileadmin/_processed_/a/e/csm_racetrack_fwhm_alle_module_e06b9dc641.jpg)
[Translate to Chinese:] Energy resolution plotted against processing time measured with two different ´Racetrack SDDs´
![[Translate to Chinese:] Energy resolution plotted against processing time measured with an SDDplus-60 detector at various chip temperatures](/fileadmin/_processed_/f/c/csm_oval_fwhm_temp_abh_sddplus60ov_5abd93e21f.jpg)
[Translate to Chinese:] Energy resolution plotted against processing time measured with an SDDplus-60 detector at various chip temperatures

Application of Racetrack SDDs - Increase in solid angle
![[Translate to Chinese:] The very compact housing allows the detector to be placed into very small spectrometer tubes](/fileadmin/_processed_/f/c/csm_zeichnung-racetrack-60_1011adb26f.jpg)
[Translate to Chinese:] The very compact housing allows the detector to be placed into very small spectrometer tubes
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SDDplus-60-128pnW Racetrack
127 eV FWHM @ Mn-Kα, −30 °C
51 eV FWHM @ C-K, -30 °C
> 15 000 P/B ratio
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SDDplus-100-128pnW Racetrack
128 eV FWHM @ Mn-Kα, −30 °C
53 eV FWHM @ C-K, -30 °C
> 15 000 P/B ratio