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TOOLS & INSTRUMENTS

# Fourier transform infrared spectrophotometry (FTIS) facility

The Fourier transform infrared spectrophotometry (FTIS) facility serves as the measurement facility for characterizing the optical properties of materials in the infrared spectral range of 1 μm to 100 μm, with particular emphasis on the 2 μm to 20 μm region.

The facility is built around several commercial Fourier transform infrared instruments. Custom specialized accessories have been developed to enable transmittance, reflectance, and emittance measurements of a wide variety of sample types and under the variable control of measurement geometry, beam polarization, and sample temperature.

Methodologies and new techniques have been developed for high accuracy measurements. Major sources of error have been thoroughly evaluated and their resulting uncertainties minimized. Techniques have also been implemented for the characterization and derivation of other properties such as refractive index and Mueller matrix elements.

## Fourier transform infrared spectrometers

Bruker Vertex 70 
                        - Wavelength range: 0.8 μm to 330 μm
                        - Highest resolution: 0.4 cm-1
                        - Purge for FT and all instrumentation
                        - Gold-coated optics for greater IR flux
                        - Multiple source and beam ports
                        - Step-scan mode for specialized applications

Digilab FTS-7000
                        - Wavelength range: 0.8 μm - 50 μm
                        - Highest resolution: 0.25 cm -1
                        - Purge for FT and all instrumentation
                        - High stability and repeatability
                        - External beam to multiple instruments
                        - Step-scan mode for specialized applications

## Custom accessory equipment

Cryostat for sample temperature control, 10 K to 600 K (for studying temperature dependence of emittance).

Integrating Sphere with Heaters for Indirect Emittance Measurements (20 °C - 200 °C)

Brewster angle high contrast broadband polarizer

Goniometer for variable angle transmittance and reflectance, polarimetry and ellipsometry

MetrologyOptical / photometry / laser metrologyOptical physics and communications

## Organizations

                          - NIST Headquarters
                            - Laboratory Programs
                              - Physical Measurement Laboratory
                                - Sensor Science Division
                                  - Remote Sensing Group

## Details

## Contact

## Related Tools & Instruments

Infrared reference integrating sphere (IRIS)

System for infrared spectral emittance of materials

## Related Projects

Infrared optical properties of materials and components

## Related Publications

Infrared Optical Properties of Materials

### HEADQUARTERS

301-975-2000

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