CL8100 MK5

Приставка для катодолюминесценции на оптические микроскопы.


Использование катодолюминесценции позволяет получить ту же информацию, что и при использовании электронных микроскопов, потратив значительно меньше времени и средств.

Приставка Optical Cathodoluminescence Stage может быть установлена на большинство современных оптических микроскопов, использующих различные методики. При этом можно изучать как крупные (толщиной до 15 мм), так и тонкие сечения. Базовая приставка может быть улучшена путём добавления системы для анализа оптического спектра или системы энергодисперсионной рентгеновской спектрометрии.
 
Особенности и преимущества:
 
  • Модель MK5 является последней в модельном ряду- она надёжна, проверена временем и позволяет проводить операции автоматически
  • Система компактна
  • Встроенные микроконтроллер и большой дисплей, предоставляющий дополнительную информацию о ходе эксперимента
  • Яркость дисплея автоматически изменяется в зависимости от освещения
  • Исследования можно проводить в режиме продолжения откачки при удалённом источнике напряжения, отслеживая и управляя ходом эксперимента с внешнего ПК
  • Постоянно улучшаемое программное обеспечение

(Eng)

Stage

  • Stage movement viewing area — 70mm x 50mm
  • Sample thickness up to 15mm

Sample Chamber

  • Base window for transmitted light microscopy for standard polished geological sections.
  • Vacuum manifold with automatic precision vacuum control valve, solid-state pressure gauge, automatic vent valve.
  • KF direct connection for vacuum pump.

Chamber Top Plate (Incorporating Electron Gun)
Choice of TP5 or TP9 top plate included in standard unit.
TP5 with 5mm WD for objectives with 2.5 X and above magnification.
TP9, larger window top plate with 9 mm WD for objectives from 1 X and above.
(either Top Plate available as an additional item).

Micro-Controlled Electronics Unit

  • Gun Supply — 4kV to 30kV and 20μA to 2mA. Gun current , voltage electronic/vacuum stabilised.
  • Controls — pre-select gun voltage, gun current values.
  • Switch select- insert sample, operate mode: automatic or manual, gun voltage on/off
  • Alpha numeric display- gun voltage, gun current, vacuum, operating mode and state, diagnostics for all internal power supplies, control values.
  • PC interface- RS 232
  • Preset controls- gun power, voltage limit, current limit, display auto brightness.
  • Indicators- vacuum pump, vacuum ready, kV on, gun supply limits, vacuum control valve operation.
  • Gun safety- interlock to vacuum, external link present.
  • Options- two auxiliary power supplies.

Vacuum
Precision automatic control valve, automatic vent valve. Input port air, helium, argon or other gas.
Measurement:

– solid-state pressure gauge, indication
– alpha-numeric display.
Operation
— touch switch, automatic vacuum controlled gun high voltage & current
– vent. Interlock to high voltage.

(Eng)

A cathodoluminescence (CL) microscope combines methods from electron and regular (light optical) microscopes. It is designed to study the luminescence characteristics of polished thin sections of solids irradiated by an electron beam.
Using a cathodoluminescence microscope, structures within crystals or fabrics can be made visible which cannot be seen in normal light conditions. Thus, for example, valuable information on the growth of minerals can be obtained. CL-microscopy is used in geology, mineralogy and materials science (rocks, minerals, volcanic ash, glass, ceramic, concrete, fly ash, etc.).

CL color and intensity are dependent on the characteristics of the sample and on the working conditions of the electron gun. Here, acceleration voltage and beam current of the electron beam are of major importance. Today, two types of CL microscopes are in use. One is working with a «cold cathode» generating an electron beam by a corona discharge tube, the other one produces a beam using a «hot cathode». Cold-cathode CL microscopes are the simplest and most economic type. Unlike other electron bombardment techniques like electron microscopy, cold cathodoluminecence microscopy provides positive ions along with the electrons which neutralize surface charge buildup and eliminate the need for conductive coatings to be applied to the specimens. The «hot cathode» type generates an electron beam by an electron gun with tungsten filament. The advantage of a hot cathode is the precisely controllable high beam intensity allowing to stimulate the emission of light even on weakly luminescing materials (e.g. quartz – see picture). To prevent charging of the sample, the surface must be coated with a conductive layer of gold or carbon. This is usually done by a sputter deposition device or a carbon coater.
CL systems can also be attached to a scanning electron microscope. These devices are expensive and are traditionally used for special applications like e.g. investigations in materials sciences or quality determination of ceramics. The most prominent advantage is their higher magnifications. However, CL colour information can only be obtained by a spectroscopic analysis of the Luminescence emission.

Direct viewing of emission colors is only provided by optical CL microscopes, both «cold» and «hot» cathode types.