ASD FieldSpec 4 Hi-Res: High Resolution Spectroradiometer
8 nm SWIR resolution ideal for geological studies and atmospheric research
The ASD FieldSpec 4 Hi-Res is a high resolution spectroradiometer designed for faster, more precise spectral data measurements for a wide array of remote sensing applications.
Overview
The 3 nm VNIR, 8 nm SWIR spectral resolution of the ASD FieldSpec 4 Hi-Res spectroradiometer provides superior spectral performance across the full range solar irradiance spectrum (350 – 2500 nm). The enhanced spectral resolution in the SWIR range (1000 – 2500 nm) is particularly useful for detecting and identifying compounds with narrow spectral features in the longer wavelengths such as alteration mineralogy and gases for atmospheric analysis.
Additionally the 8 nm resolution meets or exceeds the spectral resolution of most hyperspectral sensors making the ASD FieldSpec 4 Hi-Res spectroradiometer an excellent choice for sensor validation and calibration, as well as ground truthing and building spectral libraries.
Like all ASD FieldSpec spectroradiometers, the ASD FieldSpec 4 Hi-Res can be used as a high resolution spectrometer for very accurate contact reflectance measurements.
Key applications
The ASD FieldSpec 4 Hi-Res NG spectrometer can be used in many industry applications, including:
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.
Sensor Calibration
An accurate radiance calibration of an imaging sensor is critical to many remote sensing applications.
Supervised Classification
Supervised classification can be performed using either image-derived or field-measured spectral signatures.
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.
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.
Ground Truthing
Laboratory-quality in situ field measurements with equivalent illumination and viewing geometry for accurate correlation to satellite and aircraft sensor data.
Remote Sensing and Geology
ASD’s spectroradiometers have been used for decades for remote geologic interpretation.
Field Spectroscopy
Field spectroscopy — the study of the interrelationships between the spectral characteristics of objects and their biophysical attributes in the field environment.
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.
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.
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 (NIR) spectroscopy is the ideal measurement tool.
Specification
| Spectral Range | 350-2500 nm |
| Spectral Resolution | 3 nm @ 700 nm
8 nm @ 1400/2100 nm |
| Spectral sampling (bandwidth) | 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 1.4 X10-9 W/cm2/nm/sr @ 1400 nm SWIR 2 2.2 X10-9 W/cm2/nm/sr @ 2100 nm |
| Weight | 5.44 kg (12 lbs) |
| Calibrations | 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 |
Accessories
ASD FieldSpec 4 Hi-Res: High Resolution Spectroradiometer
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 measurement of samples through clear and transparent plastic bags.
In addition to the standard contact probe, ASD 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. (see image below specifications)
Specifications:
| 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.
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.
Muglight specifications:
| 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.
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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.
The Turntable offers:
- 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.
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.
Leaf Clip Version 2
ASD's Leaf Clip 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.
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.
Technical Specifications
| Length | 11.43 cm (4.5 inches) |
| Width | 8.255 cm (3.25 inches) |
| Weight | 292 grams (10.3 ounces) |
General Accessories
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 waist-belt on the back pack, and many offer a built-in bulls-eye level for added precision.
FieldSpec Dual
Stop waiting for “ideal” weather to get your fieldwork done
The FieldSpec Dual collection software system leverages the value and utility of the world’s most trusted line of portable field spectrometers. The software intercalibrates and wirelessly synchronizes two ASD FieldSpec spectroradiometers to collect near simultaneous white reference and sample target radiance spectra. The system virtually eliminates errors associated with time varying atmospheric conditions, one of the biggest challenges to collecting accurate field spectra.