Omni-Diff™

Omni-Diff with Omni-Cam The Omni-Diff™ diffuse reflectance probe is designed to interface to virtually any spectrometer via fiber optics. This miniature accessory comes equipped with input and output SMA connectors that can be readily attached to a fiber optic coupler, like the Harrick FiberMate2. It is ideal for diffuse reflectance analysis of samples up to 1.5 meters away from the spectrometer. The Omni-Diff™ measures primarily the radiation diffusely reflected from the sample. The specular component is deflected away from the collection optics. The Omni-Diff™ is offered with a selection of fiber optics for use in the UV-VIS, NIR and mid-IR. A digital imaging system is also available for photographic documentation of the sample.

Applications

Analysis of rough surfaced solids which are too large to fit in the sample compartment for conventional analysis.
Measurements of powders with no sample preparation required.
Photographic documentation of samples undergoing diffuse reflectance measurements.

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Ordering Information	Catalog Number
Omni-Diff™	OMN-DIF
VIS/Near-IR Fiber Set (350nm to 2250nm)	OMN-F-UVN
Near/Mid-IR Fiber Set (CIR fibers, 6500cm^-1 to 2240cm^-1 and 2050cm^-1 to 1000cm^-1)	OMN-F-CIR
Mid-IR Fiber Set (PIR fibers, 2000cm^-1 to 600cm^-1)	OMN-F-PIR
Options	Catalog Number
Digital Camera for the Omni-Diff™	OMN-CAM
Reference Fixture (includes an Au diffuse reference and a Spectralon reference)	OMN-DIF-R
FiberMate2	FM2-XXX*
*XXX indicates spectrometer make and model

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Additional Information

The Omni-Diff™ is excellent for diffuse reflectance measurements of samples outside of the sample compartment. The Omni-Diff™ is a fiber optic probe that is designed for measurements of powders and rough-surface solids up to 1.5m away from the spectrometer. It interfaces to the spectrometer using two fiber optics and a fiber optic coupler, such as the FiberMate2. The Omni-Diff™ features all front-surface Al mirrors on its interior, allowing operation over a wide spectral range. It comes enclosed in a box, which serves as a light shield in the UV-VIS and a purge enclosure in the IR. Fibers are available for the VIS, NIR, and mid-IR. However, an MCT detector is recommended for mid-IR applications.

The Omni-Diff™ is available with an optional digital camera for real-time viewing of the sample. This is a useful aid in positioning the accessory over small spots and for photographic documentation.

Figures 1 and 2 show the spectra recorded from several different locations on a granola bar box. Figure 3 shows the photographic images from those sites. Note that the Figure 3a has a bright section in the center. This photograph was taken with the visible source from the UV-VIS spectrometer on and it shows the actual area sampled. From the spectra, it is clear that the infrared mostly detects the glossy coating on the paper with a small contribution from the underlying cardboard on the outside of the box. The glossy coating and its characteristic peak around 3670cm^-1 is not observed from the inside of the box (blue spectra). From the UV-VIS spectra, it is clear that the sections sampled are different colors.

Figure 1. UV-VIS diffuse reflectance spectra of a Quaker Chewy Granola Bar box, recorded using the UV-VIS/NIR fibers.

Figure 2. Infrared diffuse reflectance spectra of a Quaker Chewy Granolar Bar box, recorded using the CIR fibers with a DTGS detector.


a. Granola bar segment (dark blue)	b. Blue section (red)

c. Inside section (blue)	d. White section (green)

e. Green section (purple)

Figure 3. Photographs of the different sections of the Quaker Chewy Granola Bar box sampled.
Shown with the color-code for the spectra in Figures 1 and 2.

Omni-Diff™ Data Sheet

Additional and Replacement Parts

Application Notes

Omni-Diff™

Applications

Features

Includes

Additional Information