Cryostats for FTIR Applications
Low Vibration Pulse Tube
Model
PT-950-FTIR
FTIR (Fourier Transform Infra-Red)
spectroscopy often requires that the cryostat be inserted into the sample
compartment of a spectrometer for low temperature measurements. Since
spectrometer optics are usually sensitive to vibrations, a low-vibration
approach is needed; however, the vibration-isolation stand as used in the
SHI-850 design is often not
compatible with the FTIR configuration. An alternative approach is to use
a pulse tube refrigerator to provide cooling. These coolers feature very
low vibrations - particularly on the room temperature housing - allowing the
cryostat to be mounted directly on the spectrometer. Samples are cooled by
exchange gas for rapid sample exchange and uniform cooling.
As with the SHI-850 design, the PT-950 design may be modified to suit any low-vibration application.
FTIR options for the PT-950 include:
- Multiple-position sample holders, allowing the user to switch between a reference path and several samples without removing the sample positioner
- Precision linear and rotary manipulators, manually or remotely controlled
- Mounting flange to fit many commercially available spectrometers
- IR windows, including diamond, ZnSe, polyethylene, polypropylene, sapphire and more
- Windows are available in either plane parallel or wedged configuration
- High temperature operation up to 500 K or 800 K (with sample in vacuum)
|
System Specifications (including radiational heat load) |
PT-950-FTIR |
| Sample Environment | sample in exchange gas |
| Temperature Range | <7 K - 300 K |
| Temperature Stability (with controller) | +/- 50 mK |
| Orientation | vertical |
| System Weight | ~ 70 lbs. |
| Note: Specifications do not include parasitic or experimental heat loads. | |
PT-950-FTIR Mechanical Drawing
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