The SR-4500A is a “signature” model which employs three, TE-cooled silicon and InGaAs arrays for a single broadband scan with the highest spectral resolution from 350-2500nm and the highest sensitivity of any comparable instrument. It is purpose-designed for spectral radiance calibration transfer with satellite imaging instrumentation. Reference users include leading NMIs and space institutes. A key feature is the very low (1%) drift from a cold start.
The SR-4500A is portable, compact, UV/VIS/NIR spectroradiometer with three thermoelectrically cooled photodiode arrays for the ultimate in high performance and measurement stability through a wide range of ambient temperatures and environments.
The SR-4500A is designed to meet the needs of integrating sphere owners doing radiometric calibration transfer for integrating spheres used for satellite systems, or for any users who have system lamps with high operating hours, light sources more than two years old, a mandate for scheduled calibration, or systems that are just too large to send out for calibration. With the SR-4500A, calibration can be accomplished on-site.
The SR-4500A has enhanced drift stability of 0.1%. This offers the ability to more accurately calibrate integrating spheres and light sources that calibrate precision sensors in satellites, hyperspectral systems and UAVs. Better sensor calibration results in better quality and interpretability of remote sensing data.
Model | SR-4500A |
Spectral Range | 350–2500nm |
Spectral Resolution | 3nm @ 350-1000nm 8nm @ 1500nm 6nm @ 2100nm |
Sampling Bandwidth | 1.5nm (350-1000nm) 3.8nm @1500nm 2.5nm @ 2100nm |
Photodiode Detector | 512 element TE cooled Si (350-1000nm) 256 element TE cooled extended InGaAs (1000-1900nm) 256 element TE cooled extended InGaAs (1900-2500nm) |
Noise Equivalence Radiance (with 1.2 meter fiber optic) | 0.2×10-9 W/cm2 /nm/sr @ 400nm 0.2×10-9 W/cm2 /nm/sr @ 700nm 0.9×10-9 W/cm2 /nm/sr @ 900nm 1.2×10-9 W/cm2 /nm/sr @ 1500nm 1.8×10-9 W/cm2 /nm/sr @ 2100nm |
Auto Dark | Yes |
Auto Exposure | Yes |
Interface | Wireless Bluetooth and USB interfaces |
Software | DARWin SP Data Acquisition Software |
Minimum scan speed | 100milliseconds |
Power | 7.5V, 30W |
Dimensions | 8.5″x 13″x 5″ (22 x 33 x 12.7 cm) |
Weight | 12.26 lbs (5.5kg) |
Integration Time | 1 – 1000 ms |
Match Radiance | VNIR: 10 x Solar; SWIR: 2 x Solar |
λ Reproducibility | 0.1nm |
λ Accuracy | 0.5nm |
TTL & Phototriggering for pulsed measuremen | No |
Stability | 0.1% drift stability |
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