ASD FieldSpec 4 Standard-Res Spectroradiometer

Overview

The ASD FieldSpec 4 Standard-Res portable spectroradiometer is the right choice for a wide range of remote sensing applications, including multispectral sensor ground truthing and calibration, agricultural analysis, and snow and ice studies.

In addition to being a world-class spectroradiometer, the FieldSpec 4 Standard-Res is equally suited to serve as a rugged, portable spectrometer for accurate contact reflectance or non-solar stand-off measurements.

The 3 nm VNIR, 10 nm SWIR spectral resolution is ideal for characterizing spectral features with a resolution down to 10 nm.

The FieldSpec 4 Standard-Res is well-positioned to meet a majority of the technical needs of field researchers who require dependable and trusted results from a field portable spectroradiometer.

Best for: users requiring maximum sensitivity, outdoor and remote sensing applications
Superior signal-to-noise ratio: twice as sensitive; the best choice for working with limited natural light sources like sunlight
Permanent fiber optic cable: factory-installed to eliminate signal loss at junction points, ensuring optimal performance
Ideal for remote sensing: used for ground-truthing overflight sensors, matching satellite data, and ensuring accurate spectral measurements under varying environmental conditions
Recommended for sunlight use: essential for reliable data collection under natural light

Why post-dispersive technology matters

Pre-dispersive systems: Disperse light before reaching the sample, relying on an internal light source.

Post-dispersive systems: Disperse light after reflection, allowing external light sources like the sun to be used.

The post-dispersive system technology used in ASD instruments offers superior analysis capabilities:

Measures reflected energy from external light sources
Adapts to different lighting conditions without internal light dependence
Provides reliable calibration for spectral radiometry

Key applications

Remote sensing

Spectral remote sensing: Collection of visible, near infrared, and short-wave infrared images for the detection, identification, and quantification of surface materials, biological, and chemical processes for research and analysis in numerous environmental and military applications.
Remote sensing and geology: ASD’s spectroradiometers have been used for decades for remote geologic interpretation. Accurate field conditions replication is crucial for supporting overflight sensors.
Atmospheric remote sensing research: observations of direct, diffuse, and total spectral solar irradiance, as well as sky and cloud radiance, are essential for atmospheric research in many climate and ecosystem energy balance studies.
Airborne remote sensing measurements: the collection of spectra over areas that are too large or inaccessible for ground-based measurement.

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

Field spectroscopy: Field spectroscopy — the study of the interrelationships between the spectral characteristics of objects and their biophysical attributes in the field environment.

Plant physiology: ASD systems are used to determine plant physiological status, including disease status, nutritional status related to nitrogen uptake and moisture balance.

Camouflage characterization and detection: The detection of camouflaged or hidden objects requires a measurement that provides a contrast between the object and background materials.

Calibrations

Sensor calibration: an accurate radiance calibration of an imaging sensor is critical to many remote sensing applications.
Spectroradiometry and radiometric calibration: spectroradiometry, the measurement of absolute optical radiation at each wavelength, is applicable to a variety of settings, including measuring the spectral energy output of a lamp, LED display, or other light source to determination of the flux of sunlight reaching a forest floor or other scene.

Supervised classification: Supervised classification can be performed using either image-derived or field-measured spectral signatures.

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.

Biomass analysis: From characterization of oil content of soybeans and other crops, to quantification of key parameter levels in biofuel processing and quality analysis of final product, near-infrared spectroscopy is the ideal measurement tool.

The mineral exploration process

Aerial survey with sensors: Specialized sensors scan large areas for mineral deposits
Ground-level confirmation with FieldSpec: Validates and refines aerial survey images
Targeted drilling: Uses confirmed data to identify precise drilling locations
Material analysis: XRF identifies metals, while NIR pinpoints specific mineral compositions

The ASD FieldSpec 4 full spectral range makes it ideal for field campaigns needed to ground-truth orbital measurements, which typically extend to the longer wavelengths.

Dr. Ulyana Horodyskyj — CEO of Science in the Wild

Spectral performance	350-2500 nm
Resolution	3 nm @ 700 nm 10 nm @ 1400/2100 nm
Spectral bandwidth	1.4 nm @ 350-1000 nm 1.1 nm @ 1001-2500 nm
Measurement time	100 milliseconds
Light source	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
Detector	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 1.2 X10-9 W/cm2/nm/sr @ 1400 nm SWIR 2 1.9 X10-9 W/cm2/nm/sr @ 2100 nm
Weight	5.44 kg (12 lbs)
Calibration type	Wavelength, absolute reflectance, radiance, irradiance. All calibrations are NIST traceable. (*radiometric calibrations are optional)
Computer	Windows® 10 64-bit laptop (instrument controller)
Warranty	One year full warranty including expert customer support

Probes and Lighting

Contact Probe

The ASD Contact Probe is designed for contact measurements of solid raw materials such as minerals, grains, other granular materials. Its innovative optical design minimizes measurement errors associated with stray light and allows for the measurement of samples through clear and transparent plastic bags.

In addition to the standard contact probe, we also offer the Hi-Brite contact probe and the Plant Probe.

All contact probes are available with a ruggedized cable feed and cable, designed for applications that involve extra cold or harsh temperatures.

Length	10" ( 25.4 cm)
Weight	1.5 lbs (.7 kg)
Power requirements	12-18 VDC, 6.5 W
Lightsource type/Life (approx.)	Halogen bulb/1500 hours
Halogen bulb color temperature	2900 K
Spot size	10 mm

Hi-Brite Contact Probe

The same design, features, and benefits of ASD's standard contact probe, but with a higher intensity illumination setting on the sample window. This higher intensity illumination is ideal for inorganic applications, and is recommended for mineral and ore characterization in mining exploration and research applications using the TerraSpec, FieldSpec 4 Hi-Res and LabSpec Hi-Res spectrometers.

Also available with the ruggedized cable feed and cable for applications requiring extra cold or harsh temperature tolerance.

Length	10" ( 25.4 cm)
Weight	1.5 lbs (.7 kg)
Power requirements	12-18 VDC, 6.5 W
Lightsource type/Life (approx.)	Halogen bulb/1500 hours
Halogen bulb color temperature	2901 +/- 10º% K
Spot size	10 mm

Muglight

The ASD Muglight is designed for analysis of raw materials requiring reflectance and absorbance measurements. It can measure samples through glass vials, or using the ASD sampling tray adapter. It's unique and innovative design minimizes measurement errors associated with stray light and specular reflected components.

For users requiring higher intensity illumination, ASD also offers the Hi-Brite Muglight.

Size	5.5” x 3.7” (14cm x 9.4cm)
Weight	2.91 lbs (1.3 kg)
Power requirements	Input power 5.5 W, bulb 4 W
Light source (type/life) approx.	Tungsten Quartz Halogen b/1500rs
Bulb color temp	2900 K
Spot size	12 mm

Hi-Brite Muglight

The same design, features, and benefits of ASD's standard Muglight, but with a higher intensity illumination setting on the sample window. This higher intensity illumination is ideal for inorganic applications, and is recommended for use with the TerraSpec, FieldSpec 4 Hi-Res, and LabSpec 4 Hi-Res spectrometer models.

The Hi-Brite Muglight is designed for analysis of raw materials requiring reflectance and absorbance measurements. It can measure samples through glass vials, or using the ASD sampling tray adapter. It's unique and innovative design minimizes measurement errors associated with stray light and specular reflected components.

Size	5.5” x 3.7” (14cm x 9.4cm)
Weight	2.91 lbs (1.3 kg)
Power requirements	Input power 5.5 W, bulb 4 W
Light source (type/life) approx.	Tungsten Quartz Halogen b/1500rs
Bulb color temp	2900 K
Spot size	12 mm

Plant Probe

The same great design and functionality as ASD's standard contact probe with a lower intensity bulb position for non-destructive data collection from live vegetation and other heat-sensitive targets.

The plant probe can be used alone or in combination with a Leaf Clip to protect sensitive plants.

Combine the Plant Probe with the Leaf Clip for easy one-handed functionality with improved measurements.

Length	10" ( 25.4 cm)
Weight	1.5 lbs (.7 kg)
Power Requirements	12-18 VDC, 6.5 W
Light Source Type/Life (approx.)	Halogen bulb/1500 hours
Halogen Bulb Color Temperature	2901 +/- 10º% K
Spot Size	10 mm

Leaf Clip 2

The Leaf Clip 2 assembly interfaces with the ASD Plant Probe. The Clip comes with the same replaceable white and black background standards (eight of each, including the pre-mounted ones) that were included with the previous version of the leaf clip.

The white backgrounds are .120mm thick x .935" OD Gore-Tex white PTFE reflector material. The black backgrounds are .004" thick x .935 OD black painted Vinyl. White Reference Cap (A122634) or 3.62” Spectralon (A128533) can be used as white background in addition to the Gortex for more accurate measurements.

The Leaf Clip 2 also uses the same mounting bracket as the FieldSpec pistol grip, enabling it to be secured to the backpack waist belt when not in use.

Integrating Sphere

Integrating spheres collect reflected light from samples over a full hemisphere. The sphere, by nature of its internal diffuse (lambertian) reflection and integration of the energy, is insensitive to directional reflectance features coming from the sample, and therefore, gives a very repeatable “averaged” response to the reflectance of the sample placed in the beam at the sphere port.

Sample placement and incidence beam/collection alignment are less critical to the measurement results because the integrating sphere looks at representative averaged energy from all angles at the same time.

Configurable in a number of different ways, with very minimal set up, the sphere allows for rapid analysis of several important quantities:

13º/D Total Hemispherical Reflectance (Specular Included)
Comparison Method and Substitution Method
13º/D Hemispherical (Specular Excluded) Reflectance Factor
Normal Hemispherical Transmittance

Turntable

When your application requires analysis of irregularly shaped or non-homogeneous samples, the ASD Turntable is ideal for obtaining a highly accurate average.

Especially useful for instrument owners in the grain, agriculture, pulp and paper, food, plastics and mining industries.

53.2 mm sampling spot size
Rotates at 22 RPM
Fits up to a 150mm sample dish
Compact (8"x11"x11" or 20.32 cm x 27.94 cm x 27.94 cm) footprint.

The Turntable comes standard with a 4000 hour halogen light source and one standard 150 mm x 15 mm Petri dish.

Fiber optic illuminator

The Fiber Optic Illuminator is a portable, external light source designed for use with ASD instruments and sampling accessories that do not have a built-in light source.

Length	11.43 cm (4.5 inches)
Width	8.255 cm (3.25 inches)
Weight	292 grams (10.3 ounces)

General

Pistol Grips

ASD offers multiple pistol grip options for superior ease-of-use and adaptability to a variety of environmental and situational elements, when using your FieldSpec® and FieldSpec HandHeld instruments.

All pistol grip designs include the quick-connect/disconnect fiber optic cable snap-in feature, pistol grip clip assembly for safely and securely affixing the pistol grip to your backpack waist-belt, and many offer a built-in bulls-eye level for added precision.

Palm grip

Optional palm grip with bare fiber optic input:

Secures the fiber optic cable during fieldwork
Prevents damage from unexpected tension
Ensures consistent lighting conditions during measurements

Telescopic tubes

A variety of telescopic tubes are available for long-range measurements:

1-degree fore optic: measures distant objects up to 100 feet away
Smaller telescopic tubes: focus on specific areas within 10 feet
Spot Size Matching: ensures accurate data by aligning the instrument field of view with satellite pixel resolution

FieldSpec 4 Standard-Res Spectroradiometer

Ideal for field spectral research

Overview

Features

Why post-dispersive technology matters

Key applications

The mineral exploration process

Specification

Accessories

Software

Probes and Lighting

Contact Probe

Hi-Brite Contact Probe

Muglight

Hi-Brite Muglight

Plant Probe

Leaf Clip 2

Integrating Sphere

Turntable

Fiber optic illuminator

General

Pistol Grips

Palm grip

Telescopic tubes

User manuals

Software downloads

Support

Services

Solutions to maximize the return on your investment

Support

Expertise

Training and education

Maximum sensitivity, wherever you go.