The MicroNIR family of spectrometer is the next generation of ultra-compact near-infrared spectrometer sensors and analyzers solving customer needs across multiple industries.

Built on the proprietary VIAVI Linear Variable Filter (LVF) technology, originally developed for NASA interplanetary spacecraft, each MicroNIR instrument is fit-to-purpose, whether the application is in the sugar cane field, law enforcement, or pharmaceutical manufacturing plant. Our line of process analytical (PAT) instruments are designed to seamlessly integrate with your existing equipment and process controller to deliver tighter process control and actionable insight, improving quality, optimizing cycle time, and reducing cost. Our versatile handheld instrument is designed for go-anywhere, do-anything applications.

Every MicroNIR instrument is individually calibrated at the factory to produce results nearly identical to every other MicroNIR instrument, allowing you to develop chemometric models on a minimum number of units and scale your deployment as widely as you like. With no moving parts, no free space optics, no fibers, and no maintenance requirements,


The MicroNIR PAT-U can be used in an easy manner and was designed for the present-day demanding GMP-regulated environments; however it still needs marginal system maintenance. There are no moving components or expensive fiber optic cables, enabling excellent instrument stability and performance in challenging process environments. Its stainless steel exterior is water and dust resistant according to IP65 standards and cleans easily.

Key features of the new MicroNIR PAT-U process spectrometer include:

  • Non-invasive, real-time NIR analysis
  • Compact for effortless integration
  • USB power and communication
  • Washable, IP65/67 rated enclosure
  • Fully qualified for GxP and Title 21 CFR-compliant installations

Applications of the new MicroNIR PAT-U process spectrometer include:

  • Pharmaceutical manufacturing
    • Granulation
    • Fluid bed drying
    • Content uniformity
  • Food and feed manufacturing
    • Fat
    • Moisture content
    • Protein
    • Fiber
  • Industrial processing
    • Polymers
    • Reaction monitoring
    • Petrochemicals

MicroNIR Software

The included MicroNIR Pro software suite has features for data acquisition, calibration and method development, user management, and real-time prediction. MicroNIR Pro can build and apply complete chemometric models using regression and classification algorithms including PLS, Moving Block, SMV, and PCA analyses. Batch mode predictions on stored data are also supported.

Options include an enhanced OPC interface for integration with process control systems and prediction engine add-ins for Camo Unscrambler, Eigenvector Research Solo Predictor and Sartorius SIMCA chemometric software.

Mounting and Process Integration

VIAVI offers multiple options for interfacing the PAT-U to process equipment via standard sanitary flanges and weld-in flanges with a sapphire process window that separates the MicroNIR from the material being analyzed.


The standard mount includes a weld in base flange, a 2” sanitary (hygienic) flange mount, a sapphire window, and a retaining ring with O-rings. The base flange is welded into a hole cut in the specific process equipment. Next, the window, the sanitary flange mount, and retaining ring are assembled. The PAT-U with a modifiable collet then secures against a sanitary flange and the window using a standard tri-clover clamp (or C-clamp). All pieces can be dismantled for easy cleaning and maintenance.


The threaded mount allows a user to weld a mount into the process equipment and then lin

k the PAT-U using the threaded tip of the spectrometer. This mount also has a removable window to allow easy cleaning and maintenance.