FieldSpec 4 Wide-Res Field Spectroradiometer

The high performance, cost effective spectroradiometer solution

The 3 nm VNIR, 30 nm SWIR spectral resolution of the FieldSpec® 4 Wide-Res field spectroradiometer, is a cost-effective solution for the analysis of any material with broad spectral features. General vegetation analysis and water column studies are common application areas that are associated with broader spectral features. The FieldSpec 4 Wide-Res field spectroradiometer can be utilized for many of the same applications as the Standard-Res model although the characterization of material with sharper spectral features will be less precise. The FieldSpec 4 Wide-Res is not recommended for the analysis of materials and compounds with narrow or sharp geological spectral features in the SWIR range such as alteration mineralogy or atmospheric/gas studies.

Because of its wider optical slit the FieldSpec Wide-Res field spectroradiometer delivers the best signal throughput of any FieldSpec spectroradiometer. High throughput benefits measurements taken in low illumination conditions.

This instrument is available at a significantly lower price point than other FieldSpec 4 models, which makes it an attractive option when budgets are tight.

In addition to being a cost-effective field spectroradiometer, the FieldSpec 4 Wide-Res also functions well as a rugged, field spectrometer for accurate contact reflectance or non-solar stand-off measurements.

Spectral Range 350-2500 nm
Spectral Resolution 3 nm @ 700 nm
30 nm  @ 1400/2100 nm 
Sampling Interval 1.4 nm @ 350-1000 nm
1.1 nm @ 1001-2500 nm
Scanning Time 100 milliseconds
Stray light specification VNIR 0.02%, SWIR 1 & 2 0.01%
Wavelength reproducibility 0.1 nm
Wavelength accuracy 0.5 nm
Maximum radiance VNIR 2X Solar, SWIR 10X Solar
Channels 2151
Detectors VNIR detector (350-1000 nm): 512 element silicon array
SWIR 1 detector (1001-1800 nm): Graded Index InGaAs Photodiode, Two Stage TE Cooled
SWIR 2 detector (1801-2500 nm): Graded Index InGaAs Photodiode, Two Stage TE Cooled
Input 1.5 m fiber optic (25° field of view). Optional narrower field of view fiber optics available.
Noise Equivalent Radiance (NEdL) VNIR     1.0 X10-9  W/cm2/nm/sr @700 nm
SWIR 1  1.5 X10-9  W/cm2/nm/sr @ 1400 nm
SWIR 2  2.8 X10-9  W/cm2/nm/sr @ 2100 nm
Weight 5.44 kg (12 lbs)

Wavelength, absolute reflectance, radiance*, irradiance*. All calibrations are NIST traceable. (*radiometric calibrations are optional)


Windows® 7 64-bit laptop (instrument controller)


One year full warranty including expert customer support

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Use ASD's rapid, precise spectroradiometers for your optics and photonics applications.

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The study of snow and ice characteristics to better understanding the Earth-atmosphere radiation balance and correlations between snow reflectance and grain shape and size, hardness index, density, liquid water content, and snow temperature.

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Laboratory-quality in situ field measurements with equivalent illumination and viewing geometry for accurate correlation to satellite and aircraft sensor data.

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Field Spectroscopy

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Landscape Ecology and Ecology Research

The ability to accurately perform reflectance and radiometric measurements of vegetation and soil in the field is critical to understanding light utilization and partitioning within a plant community.

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Climate Effects

Global change occurs on a daily basis and data collected through remote sensing can be used effectively in climate change studies.

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Atmospheric Remote Sensing Research

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Light Energy Measurement

The field measurement of light energy constitutes an essential step in some of the world’s most advanced research applications.

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