LimsPulse
Spectroscopy

Near-infrared (NIR) spectrometer

Measures how a sample absorbs near-infrared light (about 780–2500 nm) through glass or plastic, in seconds and without sample preparation. Used with chemometric libraries for raw-material identity testing, blend monitoring and moisture.

  • Pharmaceutical
  • Agriculture & grain
  • Food & beverage
  • Petrochemical
  • Polymers
  • Animal feed
Photo of a Near-infrared (NIR) spectrometer
Photo: Allancik, CC BY-SA 4.0 (cropped), via Wikimedia Commons
CALIBRATION

NIR calibration procedures

Wavelength accuracy

Checks that the wavelength (or wavenumber) scale of the NIR spectrometer is correct by measuring the band positions of a certified reference material such as polystyrene or a rare-earth oxide standard.

Open procedure

Photometric linearity

Checks that the NIR spectrometer's absorbance (log 1/R) response is linear by measuring a set of certified reflectance standards of different reflectance values.

Open procedure
QUALIFICATION

Instrument qualification (DQ · IQ · OQ · PQ)

  1. 01

    DQ — Design qualification

    Defines needs such as spectral range, resolution, sampling accessories (handheld probe, vial holder), chemometric software and data integrity features.

  2. 02

    IQ — Installation qualification

    Confirms components, serial numbers, software version, accessories and documentation are delivered and installed correctly.

  3. 03

    OQ — Operational qualification

    Checks wavelength accuracy, photometric linearity, photometric noise and wavelength repeatability with certified external standards.

  4. 04

    PQ — Performance qualification

    Shows that the validated libraries and models give correct results in routine use, supported by daily performance tests and periodic library review.

In LimsPulse · Calibration Management

Keep every NIR in control: usage logs, calibration and maintenance schedules, and automatic blocking of overdue instruments.

See how