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SPECTRAFIRE, Far Infrared Reflectometer Attachment

Shown attached to a personal computer for processing, the Spectrafire is an emissometer that uses an ellipsoidal collector, which allows this bench unit to be smaller than its predecessors.
Shown attached to a personal computer for processing, the Spectrafire is an emissometer that uses an ellipsoidal collector, which allows this bench unit to be smaller than its predecessors.

The AZ Technology SPECTRAFIRE is a far infrared reflectometer attachment designed for the Thermo-Nicolet line of FTIR spectrometers. As a system, the SPECTRAFIRE far IR reflectometer attached to the Thermo-Nicolet spectrometer provides a Fourier transform infrared (FT-IR) spectral reflectometer that measures spectral total hemispherical reflectance using a unique design for hemispherical energy collection (patented). The instrument scans near-normal hemispherical reflectance from 1.67 microns to 40 microns. All compartments can be purged to minimize signal losses due to absorption by water and carbon dioxide. Normal emittance is calculated by integrating the measured spectral reflectance with respect to the black body curve.

SPECTRAFIRE far IR reflectometer has two modes of operation: absolute and relative/differential. In absolute mode near-normal incident, hemispherical reflectance is measured directly using an internal calibration arm specifically matched to the collector. Calibration is not required in this mode. In relative (or differential) mode, the internal calibration arm is not used. Instead, the investigator supplies a reference sample for the background run and then measures the new sample.

In addition to cataloging and tracking sample spectrums, total hemispherical emittance can be determined for opaque samples by using a specially calibrated puck. Emittance calculated from the SPECTRAFIRE data does not depend on knowing the source spectrum and is not restricted to only 300K. SPECTRAFIRE can be used to correctly determine emittance at temperatures other than 300K and to correctly determine emittance of non-gray bodies.

SPECTRAFIRE Far IR Reflectometer Optical Subsystem
SPECTRAFIRE Far IR Reflectometer
SPECTRAFIRE Far IR Reflectometer

A collimated infrared beam passes from the Nicolet through the port on the left side of SPECTRAFIRE. An off-axis parabolic mirror focuses the beam onto the sample. The sample port is located on the top of SPECTRAFIRE. The sample rests on top of the patented collector. The incident beam is reflected off of the sample and the reflected light over 2Pi steradians is collected and refocused on the detector. The signal from the detector is relayed back to the FTIR electronics. There is also a beam deflector arm built into the collector that is used for the background in absolute mode. This arm has been specifically matched to the collector's reflectance. All of the optics in SPECTRAFIRE have been coated with unprotected gold for maximum reflectance in the instruments spectral range.



Attachment of SPECTRAFIRE Far IR Reflectometer to the Thermo-Nicolet FTIR Spectrometer

The SPECTRAFIRE unit attaches to the right side of the Nicolet spectrometer. A single left-handed bolt secures it to the Nicolet. The sample port for measuring spectral total hemispherical reflectance is on the top of the unit. On the back of the enclosure there is a connector for the detector 9-pin cable and there is a connector for the purge supply.

The table below lists specifications for the SPECTRAFIRE Far IR Reflectometer.

Spectral resolution 0.5 to 32/cm
Spectral range 2.5 to 40 microns (4000 to 250 cm -1 wave number)
Sample size and geometry ≥ 0.33 inches (8.3 mm) diameter

Dimensions: FTIR with SPECTRAFIRE attached.

-Footprint: 33 x 25 inches
-Height: 13.5" at the SPECTRAFIRE sample port

Electrical requirement for Nicolet 120 VAC, 60 Hz
Warranty 1 year parts and labor

*Note: terms reflectance, emittance and absorptance and terms reflectivity, emissivity and absorptivity are often used interchangeably. Spectroreflectometer, spectro-reflectometer and spectral reflectometer are also used interchangeably.

 

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