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Microstat®He liquid helium (LHe) continuous flow optical microscopy/spectroscopy cryostat
A liquid helium cooled, vacuum loading continuous flow (CF) optical cryostat for microscopy and spectroscopy measurements requiring:
- Very short working distance
- Wide angle of incidence/reflection
- 2.2 - 500 K temperature range
- Low liquid helium comsumption - as little as 0.45 l/h using a low loss LHe transfer tube
- A compact, light weight system - only 1.8 kg
- Choice of reflectance (one window) or transmission (two windows) configuration
- Operation in any orientation
Ideal for use with microscope-based spectrometers
A unique feature of the MicrostatHe is its inter-changeable "cold unit" which allows the same core cooling unit to be fitted into a MicrostatHe Rectangular Tail or an OptistatCF-V outer body for huge experimental flexibility.
Stock available now! Get your MicrostatHe even faster - now available from stock for shipment within 3 weeks of order1. Use the Enquiries form or email us to reserve your system.
1subject to your choice of window material
Operation
The MicrostatHe optical cryostat works on a continuous flow (CF) principle using an oil-free pump to draw liquid helium from a storage vessel along a transfer tube to the heat exchanger ("pull mode"). Temperature control is achieved by a combination of manual or automatic helium flow control and power dissipated in an electrical heater, regulated using a temperature controller.
The cryostat can also be used in "push mode", in which case the flow of liquid helium is generated by pressurising the storage dewar. The advantage is that the need for a gas flow pump is removed, eliminating the vibration and noise generated by the pump, and reducing the system cost.
The MicrostatHe can also be operated with liquid nitrogen (LN2) cooling for measurements down to 80 K.
Options
- Windows
- A wide range of window materials can be fitted to the MicrostatHe - see the 'Windows for optical cryostats guide' in Downloads and Links
- Standard window thickness is 0.5 mm with clear 10 mm access diameter. We also offer an option for a 25 mm access diameter window with a thickness of 1.5 mm
- Transmission experiments use an alternative bottom flange with a second window fitted and a transmission sample holder
- Additional or replacement window flanges available via the Oxford Instruments Direct - Cryospares® on-line catalogue
- Pump options
- A simple GF4 oil-free vane pump is supplied for operation to 3.2 K
- Lower temperatures to 2.2 K use a single-stage EPS40 rotary pump
- Temperature controller
- Flexible single or 3 channel ITC503 (rack mounted)
- Transfer tubes
- Choose an LLT600 or LLT700 low loss LHe transfer tube for minimum helium consumption - less than 0.45 l/hr at 4.2 K!
- An automated needle valve can be fitted to the LLT to allow automation of the helium flow regulation and optimisation of the helium consumption
- Alternatively use a TTL200 lightweight liquid helium transfer tube
See also the MicrostatHiResII for a high-stability, low-vibration microscopy cryostat with sample in vacuum.
Software control
- Oxford Instruments electronics products are controllable through the OxSoft software using RS232, ISOBUS or GPIB interfaces
- LabVIEW virtual instruments are provided for Oxford Instruments electronics products to allow full PC-based control and monitoring. These can be integrated into a complete LabVIEW data acquisition system
The MicrostatHe (left), MicrostatHe Rectangular Tail (centre) and OptistatCF-V (right) optical cryostats feature an inter-changeable "cold unit"
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OI Direct - Cryospares®
Browse our on-line Oxford Instruments Direct - Cryospares catalogue, offering you an extensive range of cryogenic products, spare parts, accessories and consumables. AUTUMN/FALL SPECIAL OFFERS ON NOW Click here (opens in new window) »
Downloads and Links
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