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NIRQuest+ Spectrometers

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Product Details

NIRQuest+ is the next generation of NIR spectrometers from Ocean Insight. The NIRQuest+ family has an improved optical bench design for higher-sensitivity performance and is available in a configuration well suited for your NIR application.

NIRQuest+ is available in three versions covering different wavelengths from 900-2450 nm. These spectrometers are ideal for applications including moisture content for fruit sorting; plastics recycling; and chemical concentration measurements. The spectrometer can be used in the lab or on the line, such as on a conveyor belt or in a sample stream.

NIRQuest+ can measure very small changes in absorbed signal, which are typical of harmonic overtones in the NIR. Its higher sensitivity enables better measurement accuracy, particularly in low light conditions. Also, at longer wavelengths, NIRQuest+ measures diffuse reflection at low noise levels, resulting in cleaner spectra at wavelengths where distinct spectral features can be difficult to capture.

For NIR solutions for customer integration projects, Ocean Insight offers several capabilities: in-house feasibility and verification testing via Ocean Lab Services; skilled engineering support for OEM level optimization of spectrometer optics and accessories; and machine learning algorithm development for advanced data identification and quantification.

NIRQuest+ spectrometers are compatible with Ocean Insight's comprehensive line of fiber optic light sources, optical fibers and sampling accessories.

Product Overview

  • Preconfigured models across 900-2450 nm – options include 900-1650 nm (NIRQuest+1.7), 900-2120 nm (NIRQuest+2.2) and 900-2450 nm (NIRQuest+2.5)

  • High sensitivity – enhanced optical bench and aperture design for greatly improved spectrometer response, allowing lower limits of detection (LOD)

  • Low LOD – detect weaker sources of NIR light and use shorter integration times to capture necessary spectra

  • Thermal stability – thermoelectric cooling to -20 °C for low dark current performance

  • Flexible applications – ideal for moisture content of fruits and grains; identification of plastics in recycling; and chemical concentration measurements

  • Configurability -- compatible with Ocean Insight light sources, optical fibers and accessories

Quick tip: A spectrometer wavelength calibration source can be a useful tool for your lab. For NIR applications, we recommend an Argon (AR-2, 696-1704 nm) or Xenon (XE-2, 916-1984 nm) emission source.

NIRQuest+ in the literature: How NIRQuest+ is helping researchers make more efficient use of the byproducts of paper making and pulp processes


Watch Our Newest NIR Spectrometer Video

With NIRQuest+, you'll enjoy a 2.5x increase in sensitivity, greater thermal stability, and low limits of detection from 900-2500 nm.

Using NIR Spectroscopy for Soil Characterization

Measuring soil composition with a near-infrared diffuse reflectance system helps characterize soil quickly, economically and effectively. In this demo, we use the NIRQuest+2.5 NIR spectrometer as part of a diffuse reflectance system for soil analysis.

Listen to our experts cover topics including the advantages of NIR spectroscopy, applications that benefit from NIR techniques, and where future NIR developments may take us.

Find the best Ocean Optics NIR spectrometer to meet your price and performance criteria. We have options at every level.

With compact size and great flexibility, modular spectrometers are attractive tools for photovoltaic materials research and production.


Select model to see full specifications


Wavelength Range:
900nm - 2.45μm
Optical Resolution:
2.8 nm FWHM
4.8 nm FWHM (typical)
6.48 nm FWHM (typical)
Integration Time:
1ms - 120s
Dark Noise:
16 RMS counts @ 10 ms
24 RMS counts @ 30 ms
6 RMS counts @ 100 ms
12 RMS counts @ 250 ms
Input Fiber Connector:
SMA 905
Signal to Noise Ratio:
10000:1 (typical)
13000:1 (typical)


InGaAs linear array
InGaAs Linear Image Sensor
Entrance slit:
25 µm
Order Sorting:
OF1-RG830 longpass NIR filter


182 x 110 x 47 mm
1.18 kg (without power supply)

Measurement techniques