NIST溯源真空紫外连续可调光源
High Resolution
VUV Wavelength
Tunable Light Source and Detection System
This 0.1 nm resolution Vacuum Ultra-Violet tunable light source (TLS) and
detection system is designed to operate in the range 100-300 nm with a D2 lamp,
1/3 meter vacuum monochromator, Cesium Telluride photomultiplier, Labview™
interface and controlling electronics/PC. This system is a NIST-traceable
calibration standard in the range 110-300 nm.
It includes a motor drive system that automatically selects the
wavelength with Labview™ software.
Numerous operational modes are possible. When used as a standard light source
for calibration, it is monitored using the NIST traceable photomultiplier.
The system is shown in the picture.
The various subsystems are listed below:
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1/3 meter concave holographic grating vacuum monochromator VM327
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RF powered ultra low noise MgF2 windowed D2 lamp with power supply and
housing
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Cesium Telluride PMT detector for range of 110 to 320 nm
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Collimation
assembly, with a parabolic mirror inside of the vacuum and can be rotated to
direct the bean to the PMT and Exit Window for calibration.
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PC-controlled Motor Drive
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PC controlled data acquisition system
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Software for simultaneous data acquisition and wavelength
scanning.
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Compact vacuum station with pressure gauges
Specifications:
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Resolution: 1.3 Angstroms with 7 mm x 75 micron slit
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Spectral range: 1000-2000 Angstroms
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Photon Flux for D2 continuum: ~1e+7 Photons/sec/cm^2
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Pressure ~1e-5 mbar
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Available speeds: 20, 10, 4, 2, 1, 0.3, 0.16 Angstroms/sec
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Speeds suitable for recording data: 2, 1, 0.3 Angstroms/sec
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Step size for stepping motor: 0.25 Angstroms
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A to D: 12 Bit
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Voltage range for differential operation at the lowest gain: +/- 20 volts
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A/D available differential gains : 1,2,
4, 10, 20
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Voltage range for single ended operation: +/- 10 Volts
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Suitable control voltage for PMT: 4 Volts
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Output beam diameter = 2 cm x 2 cm collimated
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STEVEN SEPVEST CORP.
