Immersion Probe

This Immersion Probe is ideal for analyzing liquids in the U-/Vis-NIR using fiber optics. It mates directly to fiber optic spectrometers or can be interfaced to the sample compartments of UV-Vis-NIR spectrometers with the Harrick FiberMate2 or other fiber optic coupler. The Immersion Probe comes with SMA connections on its silica fibers and is designed for examination of samples up to 2 meters away from the spectrometer. The replaceable sampling tips simply screw onto the end of the fiber. To analyze a sample, install the tip, dip it into the sample and collect the spectrum. The tips are easily replaced as needed and are available for a variety of pathlengths.

Vis/NIR Immersion Probe
400 to 2200 nm
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UV/Vis Immersion Probe
200 to 1100 nm
Model No.
Immersion Probe Tip
10-mm Path Replaceable Tip
Model No.
NOTE: A Model No. ending in "XXX" denotes spectrometer code.

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  • Compact and convenient to use.
  • Two standard 905 SMA connectors for connecting suitable fiber optic cables.
  • Immersion probes available in 2 m long sets for two different spectral ranges:
    • VIS/Near-IR fiber optics for use from 400 nm to 2200 nm.
    • UV/Vis fiber optics for use from 200 nm to 1100 nm.
  • Probe dimensions: ~100mm long by 6.35 mm wide.
  • Probe body made from 316 stainless steel.
  • Other wettable materals are fused silica and epoxy.
  • Maximum operating temperature: 125°C.
  • Rated for pressures up to 0.6 MPa (4.5 torr).
  • Replaceable tips for 2, 5, 20 and 40 mm pathlengths available on special order.
  • Immersion probe with choice of wavelength range.
  • Fixed pathlength tips; choice of 10-mm or 20-mm; ordered separately.
  • Use with a fiber optic coupler, such as the Harrick FiberMate2™.
Model No. Product Description Price
FM2-XXX FiberMate2

Fiber optic coupler

Immersion Probe

The Immersion Probe with its fixed pathlength tips is a valuable tool for transmission measurements of liquids and pastes outside of the sample compartment.  Designed for transmission measurements up to 2 m from the sample, this probe connects directly to UV/Vis/NIR fiber optic spectrometer or interfaces to the sample compartments of UV/Vis/NIR spectrometers using a fiber optic coupler, such as the Harrick FiberMate2™.  Two probes are offered:  one for UV/Vis operation and the other for Vis/NIR measurements.  Both probes have screw-on fix-pathlength tips which provide either a 10-mm or 20-mm pathlength.  Additional pathlenghts are available on special order.

Figures 1 and 2 show spectra of several samples recorded using the Vis/NIR Immersion Probe with its 10-mm path tip.  The Immersion Probe was connected to the FiberMate2™ and installed in the sample compartment of the UV-Vis-NIR spectrometer.  Figure 1 shows the spectra of several different inexpensive grape products:  two different vintages of Zinful’s White Zinfandel (circa 2011 and 2012), Chateau Diana Merlot, Lolailo Sangria, and Apple and Eve Organics Grape Juice.  Note that the grape juice and merlot were diluted for analysis.  Examining them neat resulted in saturated bands.  The grape juice was diluted 50% in water and the merlot was diluted 25% and 12% in water.  As expected, all the spectra show bands attributable to water:  strong bands at 1200 nm and 970 nm, in addition to a weaker one at 740 nm.   There are some differences in the visible.  The more concentrated merlot has a stronger band at 521 nm than the less concentrated one.  Both the merlot and the 2012 zinfandel have a band at 521 nm, reflecting their deep red color.  But the component that contributes to that band is much less concentrated in the 2012 zinfandel than it is in the merlot.  Note that this band is not distinct in the 2011 zinfandel, indicating that this component either degrades with time or various significnatly between batches.  The merlot also has a distinct shoulder at 465 nm, while the grape juice and 2011 zinfandel show and underlying slope with no distinct bands in the visible.

Figure 2 shows spectra of various flavors of Gatorade.  Again, the strong water transitions at 970 nm and 1200 nm are clearly visible.  The Glacial Freeze and Grape have a distinct band at 633 nm indicative of their blue color.  The band is much stronger in the Grape, indicating a higher concentration and deeper color.  The Grape flavor also has a band at 400 nm.  The Strawberry and Orange both have a strong band at 495 nm, reflecting their redish color.  The Orange has a much stronger shoulder at lower wavelengths, adding some yellows to the red.  The Lemon-Lime has a broad band around 425 nm, giving it a yellow-green hue.

Figure 1. Transmission Spectra of Several Wines:  Zinful White Zinfandel (2012; green), Zinful White Zinfandel (2011; black), Chateau Diana Merlot (light blue, 12%; dark blue, 25%) and grape juice (red, 50%).

Figure 2. Transmission Spectra of Different Flavors of Gatorade:  Orange (orange), Strawberry (red), Glacial Freeze (light blue), Grape (blue) and Lemon-Lime (green).  The water spectrum (black) is included for reference.

This Immersion Probe with its interchangable tip provides a quick and easy method for quantitative and qualitative in-situ UV-Vis-NIR analysis of liquids, pastes some distance away from the spectrometer.