Auniontech AUT-iSpecField-HH-PRO Handheld Field Spectroradiometer
| Brand | Auniontech |
|---|---|
| Model | AUT-iSpecField-HH-PRO |
| Spectral Range | 200–1100 nm |
| Wavelength Accuracy | ≤±0.3 nm |
| Wavelength Repeatability | ±0.1 nm |
| Spectral Resolution | ≤1 nm @ 200–1100 nm |
| Spectral Sampling Interval | 0.3 nm @ 200–1100 nm |
| Number of Spectral Channels | 3000 |
| NEΔL (Noise-Equivalent Delta Radiance) | 1×10⁻⁹ W/cm²/nm/sr @ 700 nm |
| Detector | 2048-pixel CMOS |
| Minimum Integration Time | 60 µs |
| FOV | 8° (interchangeable lenses: 4°, 5°, 10°, 15°, or 25° fiber optic probe) |
| GPS | Integrated, with real-time solar zenith/azimuth angle calculation |
| Onboard Camera | 12 MP auto-focus |
| Data Storage | 128 GB internal |
| Connectivity | USB + Wi-Fi |
| Battery Life | 4–5 h (removable Li-ion) |
| Dimensions | 150 × 100 × 93 mm |
| Weight | ≤1.5 kg |
| Compliance | ASTM E275, ISO 13406-2, USGS Spectral Library compatible, ENVI-compatible output |
Overview
The Auniontech AUT-iSpecField-HH-PRO is a high-performance handheld field spectroradiometer engineered for precision in-situ measurement of spectral reflectance, radiance, and irradiance across the ultraviolet–visible–near-infrared (UV-VNIR) spectrum (200–1100 nm). Based on fixed holographic grating dispersion and a thermally stabilized 2048-pixel CMOS detector, it operates on the principle of passive optical remote sensing—capturing sunlight-reflected or target-emitted radiation without external illumination. Its optical architecture incorporates stray-light suppression, dark-current compensation, and real-time noise calibration to ensure radiometric stability under variable ambient conditions. Designed explicitly for terrestrial Earth observation, the instrument meets the physical and operational requirements of field-deployed spectroscopic surveying—including rapid acquisition in dynamic solar environments, robustness against thermal drift, and immunity to saturation under direct solar irradiance up to 20× solar intensity in the VNIR band.
Key Features
- Ultra-broad spectral coverage from 200 nm (deep UV) to 1100 nm (NIR), enabling detection of key absorption features for chlorophyll, water, iron oxides, carbonates, and hydroxyl-bearing minerals.
- High radiometric fidelity: wavelength accuracy ≤±0.3 nm, spectral resolution ≤1 nm, and NEΔL as low as 1×10⁻⁹ W/cm²/nm/sr at 700 nm—supporting quantitative BRDF characterization and inter-comparison with satellite or airborne sensors.
- Sub-millisecond temporal response: minimum integration time of 60 µs permits capture of transient spectral events and mitigates motion blur during handheld or UAV-mounted operation.
- Integrated multi-sensor synchronization: co-registered GPS geotagging, 12 MP auto-focus imaging, real-time solar geometry (zenith/azimuth), environmental telemetry (air temperature, humidity, distance), and laser-assisted targeting ensure traceable, context-rich spectral metadata.
- Field-optimized human interface: 7-inch industrial-grade capacitive touchscreen with glove-compatible operation, onboard automatic exposure control, programmable scan sequences, and one-touch spectral acquisition.
- Modular optical configuration: supports interchangeable FOV lenses (4°–25°), leaf transmission clamps, soil/mineral contact probes, and calibrated reference panels—enabling standardized reflectance measurements per ASTM E275 and ISO 13406-2 protocols.
Sample Compatibility & Compliance
The AUT-iSpecField-HH-PRO is validated for non-destructive, contactless spectral characterization of heterogeneous natural surfaces—including vegetation canopies, bare soils, rock outcrops, aquatic surfaces, and man-made materials. Its spectral response is traceable to NIST-calibrated standards and aligned with the USGS Digital Spectral Library (Version 7). All spectral outputs are exportable in ENVI-compatible BIL/BIP formats with full header metadata, including acquisition time, GPS coordinates, solar angles, instrument temperature, and integration parameters. The system supports audit-ready data provenance: timestamped logs, firmware version tracking, and raw/dark/reference frame retention comply with GLP-aligned field data management practices. While not FDA-regulated, its radiometric consistency and spectral reproducibility meet requirements for environmental monitoring programs governed by EPA Method IO-3.2 and ESA’s Fiducial Reference Measurements (FRM) framework.
Software & Data Management
The instrument ships with iSpecField—a field-acquisition software suite supporting real-time spectral preview, index computation (NDVI, EVI, SAVI, PRI, CARI, WI, VARI, etc.), and automated batch saving. SpecAnalysis, the companion PC-based post-processing platform, provides advanced calibration workflows (dark current subtraction, white reference normalization, atmospheric correction via empirical line method), spectral derivative analysis, spectral angle mapper (SAM), and library matching against USGS, ECOSTRESS, and JPL spectral databases. Both applications enforce strict file naming conventions, embed EXIF-style metadata, and generate CSV/JSON reports compliant with FAIR (Findable, Accessible, Interoperable, Reusable) data principles. Data export includes full spectral curves, statistical summaries (mean, SD, SNR), and geo-referenced image overlays—facilitating direct ingestion into QGIS, ArcGIS, or Python-based Earth observation pipelines (e.g., scikit-learn, rasterio, Py6S).
Applications
- Agriculture & Forestry: Quantification of canopy biophysical parameters (LAI, chlorophyll content, water stress) via narrowband vegetation indices; early detection of pest infestation or nutrient deficiency through spectral trajectory deviation.
- Environmental Monitoring: Soil organic matter estimation using 600–1000 nm absorption slopes; moisture mapping via 1400/1900 nm water-band depth ratios; land-cover classification using spectral unmixing techniques.
- Geological Surveying: Identification of clay minerals (kaolinite, smectite), iron oxides (hematite, goethite), carbonates (calcite, dolomite), and hydroxyl-bearing silicates based on diagnostic absorption features between 2100–2500 nm (extrapolated via spectral resampling and machine learning).
- Marine & Inland Water Studies: Retrieval of chlorophyll-a concentration, total suspended solids (TSS), and colored dissolved organic matter (CDOM) using blue-green-NIR reflectance ratios; discrimination of algal bloom species via spectral shape analysis.
- UAV-Based Hyperspectral Mapping: Seamless integration into drone payloads via TTL-triggered acquisition; synchronized GNSS-IMU data fusion enables orthorectified spectral mosaics at sub-meter spatial resolution.
FAQ
What spectral calibration standards are supported?
Factory calibration uses NIST-traceable tungsten-halogen and deuterium lamps; users may perform field recalibration using included >99% reflectance Spectralon® white panels and gray reference tiles.
Can the device operate under full sunlight without saturation?
Yes—the detector’s 60 µs minimum integration time, combined with optical attenuation via built-in neutral density filters and real-time auto-exposure logic, prevents pixel saturation even under direct noon illumination.
Is BRDF measurement capability hardware- or software-enabled?
BRDF acquisition is enabled by synchronized multi-angle motorized goniometer mounts (optional accessory); the onboard software provides angular metadata tagging and preconfigured BRDF model fitting (e.g., Ross-Thick/Li-Sparse).
Does the system support regulatory-compliant data audit trails?
Yes—every spectral file contains embedded timestamps, firmware revision, GPS fix quality, sensor temperature, and raw/dark/white frame identifiers, satisfying traceability requirements for ISO 17025-accredited environmental labs.
How is spectral data synchronized with geospatial imagery?
The integrated 12 MP camera captures JPEG images geotagged with sub-meter GPS accuracy; iSpecField overlays spectral footprints onto these images using FOV projection models and solar geometry, enabling pixel-level spectral–spatial correlation.
