a total data acquisition frequency of 17.9 kHz. The combi- restricts the spectral width of each pixel, allowing high sensi-
nation of the unusual waveform and high data rate resulted
in intensity measurements at discrete wavelengths. The 20 Table 2 Spectrometer characteristics
intensity measurements acquired during a single sweep across
´
the absorption profile were used to compute a family of Echellea Dectectorb
absorbances of varying sensitivity. This approach allowed
detection of 16 elements, improvements in the S/N at low 750 mm focal length Split frame transfer array
63° 26∞ blaze angle 80 ×80 pixels
concentrations and extension of the calibration curve linearity
46 ×96 mm grating 18 ×18 mm pixels
to 4–5 orders of magnitude. 79 grooves mm−1 2.5 mm channel stop
In the 1990s, use of solid state array detectors permitted 25 mm entrance slitwidth Thinned
simultaneous multi-wavelength detection and eliminated the 500 mm entrance slit height Back-illuminated
need for mechanical modulation.12–14 Multi-wavelength detec- Spectral bandwidth: UV antireflection coating
tion provides the equivalent of infinitely fast wavelength 2.1 pm at 200 nm 100 000 e− charge capacity
modulation (on- and o-line intensities are measured simul- 7.0 pm at 580 nm 70 Hz frame rate
Luminosity at 200 nm: 25 e− read noise
taneously) provided that all the pixels have a common exposure 0.013 mm2/nm 50% quantum eciency at 200 nm
time, i.e., the exposure start and stop times are the same. The aRef. 19. bRef. 20.
array detectors compute absorbances from a single ‘frame’ of
138 J. Anal. At. Spectrom., 1999, 14, 137–146
a total data acquisition frequency of 17.9 kHz. The combi- restricts the spectral width of each pixel, allowing high sensi-
nation of the unusual waveform and high data rate resulted
in intensity measurements at discrete wavelengths. The 20 Table 2 Spectrometer characteristics
intensity measurements acquired during a single sweep across
´
the absorption profile were used to compute a family of Echellea Dectectorb
absorbances of varying sensitivity. This approach allowed
detection of 16 elements, improvements in the S/N at low 750 mm focal length Split frame transfer array
63° 26∞ blaze angle 80 ×80 pixels
concentrations and extension of the calibration curve linearity
46 ×96 mm grating 18 ×18 mm pixels
to 4–5 orders of magnitude. 79 grooves mm−1 2.5 mm channel stop
In the 1990s, use of solid state array detectors permitted 25 mm entrance slitwidth Thinned
simultaneous multi-wavelength detection and eliminated the 500 mm entrance slit height Back-illuminated
need for mechanical modulation.12–14 Multi-wavelength detec- Spectral bandwidth: UV antireflection coating
tion provides the equivalent of infinitely fast wavelength 2.1 pm at 200 nm 100 000 e− charge capacity
modulation (on- and o-line intensities are measured simul- 7.0 pm at 580 nm 70 Hz frame rate
Luminosity at 200 nm: 25 e− read noise
taneously) provided that all the pixels have a common exposure 0.013 mm2/nm 50% quantum eciency at 200 nm
time, i.e., the exposure start and stop times are the same. The aRef. 19. bRef. 20.
array detectors compute absorbances from a single ‘frame’ of
138 J. Anal. At. Spectrom., 1999, 14, 137–146
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