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Cryostats for FTIR Applications

Low Vibration Pulse Tube - Model PT-950-FTIR

Overview

Click button below to enlarge view of PT-950-5 pulse tube for FTIR spectroscopy from Janis Research, Fourier Transform Infra-Red, low vibration, cryocooler

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, low-vibration designs using a special isolated stands are not usually practical for interfacing with a spectrometer. 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 most standard Janis designs, the PT-950 design may be modified to suit any low-vibration application.

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Standard Configuration

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, low-vibration designs using a special isolated stands are not usually practical for interfacing with a spectrometer. 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 most standard Janis designs, the PT-950 design may be modified to suit any low-vibration application.

Click button to enlarge view of mechanical drawing for PT-950-FTIR low vibration pulse tube refrigerator from Janis Research, cryocoolerEnlarge

PT-950-FTIR Mechanical Drawing

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)

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Specifications

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 ~110 lbs.
Note: Specifications do not include parasitic or experimental heat loads.
Janis

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