Freiberg
Instruments
GmbH
ּ Am St. Niclas Schacht 13 ּ 09599 Freiberg – Germany
22 / 78
electromagnetic shutter, UV-VIS optics
Module 5.1.4: Vis-NIR PMT Module
necessary for RF dose determination using the 865 nm potassium feldspar emission
useful/necessary for any other measurements where red and NIR sensitivity is
needed
thermoelectric/air cooled GaAs photocathode PMT (HAMAMATSU)
sensitivity: 380
– 890 nm,
peak-sensitivity: 12% quantum efficiency at 800 nm
cooling max. 35 deg. below RT
cooling time approx. 5 min
typ. 60 cps dark signal at -10°C (125 cps at 0°C)
photon counting system
counting linearity (random pulses, 10% count loss) 1.5 E6 cps
electromagnetic shutter, UV-NIR optics
2.1.7.
Module 5.2.1: EMCCD Unit
The
lexsyg
can adapt light detectors based on charged coupled devices (CCD). EM (electron
multiplying technology) CCD cameras have a very high sensitivity which allows even the
detection and counting of single photons.
UV to NIR (200
– 1050 nm) image detection for spatially resolved / single-grain
measurements
works at LEXSYG TL/OSL and RF measurement position (automatically change
recommended 1.3)
512 x 512 pixel back-thinned, UV-coated EMCCD chip (electron multiplying
– EM -
technology), 16 bit resolution, frame
– transfer format
works also in traditional CCD mode (low noise)
max. frame rate: > 33 frames/second (full frame)
Gigabit Ethernet data interface
high quantum efficiency from UV to NIR :
ca. 75% @ UV Quartz OSL emission peak
ca. 85-90 % @ all VIS Quartz/Feldspar emission peaks
ca. 60% @ potassium feldspar NIR RF peak (865 nm)
