Omni-Spec™ Specular Reflection Probe

The Omni-Spec™ is a 45° specular reflectance probe for sampling outside of the sample compartment. Designed to interface to virtually any spectrometer via fiber optics, this compact accessory comes with input and output SMA connectors that readily attached to fiber optic couplers, such as the Harrick FiberMate2™. A selection of UV-Vis, NIR and mid-IR fiber optics is offered for use up to 1.5 meters away from the spectrometer. A USB2 video camera is also available for real-time imaging and photographic documentation of the sample.

The Omni-Spec™ is ideal for examining a variety of samples, including optical coatings, opaque substrates and films thereon, and contaminants on reflective surfaces. It is also well suited for in-line diffuse reflectance of powders and rough-surfaced solids.

Specular reflection fiber optic probe
Model No.
NOTE: A Model No. ending in "XXX" denotes spectrometer code.

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  • Compact and convenient to use.
  • Suitable for use from the UV to the IR. For best performance, an MCT detector is recommended for use in the mid-infrared.
  • 45° nominal incident angle.
  • Two standard 905 SMA connectors for connecting suitable fiber optic cables.
  • Optical fiber optics available in 1.5m long sets:
    • UV-VIS/Near-IR fiber optics for use from 350nm to 2250nm.
    • Near/Mid-IR fiber optics for use from 6500cm-1 to1700cm-1.
    • Mid-IR fiber optics for use from 2000cm-1 to 600 cm-1.
  • Optional video imaging and illumination system
  • Optional reference materials for mid-IR and UV-VIS/Near-IR studies.
  • Omni-Spec™ specular reflectance probe.
  • Sets of two 1.5m fibers must be ordered separately.
  • Use with a fiber optic coupler, such as the Harrick FiberMate2™.
Model No. Product Description Price
FM2-XXX FiberMate2

Fiber optic coupler

OMN-DIF Omni-Diff™

Diffuse reflection fiber optic probe

Model No. Product Description Price
OMN-CAM Digital Camera for Omni-Spec, Omni-Diff Magnifier with USB interface N/A
Reference & Mirrors
Model No. Product Price
MOP-117 50 x 50 x 3.2mm Mirror $84.00
Model No. Product Price
OMN-F-CIR Near/Mid-IR Fiber Set (CIR) N/A
OMN-F-UVN Vis-NIR Fiber Set N/A
OMN-F-PIR Mid-IR Long Wavelength Fiber Set (PIR) N/A

The Omni-Spec™ is a valuable tool for specular reflectance and in-line diffuse reflectance measurements of samples outside of the sample compartment. The Omni-Spec™ fiber optic probe is designed for reflectance measurements up to 1.5m away from the spectrometer. It interfaces to the spectrometer using two fiber optic cables and a fiber optic coupler, such as the Harrick FiberMate2™. The Omni-Spec™ features all front-surface Al mirrors, allowing operation over a wide spectral range. The Omni-Spec™ is fully enclosed, shielded from light in the UV/VIS and provided with a purge enclosure for IR measurements. Fibers are available for the UV-VIS, NIR, and mid-IR. Note that an MCT detector is recommended for mid-IR applications. The Omni-Spec™ is offered with an optional digital camera for real-time viewing and photographic documentation of the sample. This camera is useful for positioning the accessory over small spots. Figures 1 through 4 show spectra of several different samples recorded using the Omni-Spec™ connected to the FiberMate2™ using appropriate fibers for the wavelength range. Figures 1 and 2 show that this combination can be used to distinguish colors from shiny plastics and papers in the visible. Figures 3 and 4 demonstrate the use of the Omni-Spec™ to spectroscopically examine coatings on metal substrates. It is interesting to note that that the PIR fiber can be used up to around 3200cm-1 although it shows significant degradation in the signal-to-noise ratio above 2000cm-1.

Figure 1. Specular reflectance of plastic shim. The color of the spectrum corresponds to the color of the plastic.

Figure 2a. Specular reflectance of a catalog cover.


Figure 2b. Catalog cover.

Figure 3. Specular reflectance of a 12 m mylar film on an Al mirror measured with a PIR fiber.

Figure 4. Specular reflectance of a 500Å SiO₂ coating on Al measured with a CIR fiber.