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.
The 3 nm VNIR, 8 nm SWIR spectral resolution of the 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 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.
| 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® 7 64-bit laptop (instrument controller) |
| Warranty | One year full warranty including expert customer support |
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.
Leaf Clip
ASD's Leaf Clip assembly is designed specifically for use with the Plant Probe to simplify the process of collecting spectra on live vegetation. The unique design includes a gentle trigger lock/release gripping system for holding the target sample in place without removing the leaf from its habitat, or inflicting damage.
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.