Overview:

SBIR has developed a high precision absolute spectral radiometer – the RAD9000. The system addresses a U.S. Navy requirement of increased radiometric accuracy compared to currently available systems.

The RAD9000 offers outstanding radiometric performance over both MWIR and LWIR bands, and meets U.S. government Test Accuracy Ratio (TAR) standards for today’s high performance EO sensors. The RAD9000 has demonstrated:

• NEΔT¹: 5 mK (MWIR)
• Radiometric Accuracy: 0.5%
  

The RAD9000 is designed for maximum accuracy and flexibility. Spectral filtering is achieved with a 30 position filter wheel, installed with high-transmission, narrow-bandpass spectral filters – and delivers spectral resolution (Δλ/λ)) better than 2%. Spare filter wheel positions allow custom filters (broadband, CO2 notch, etc.) to be added as required. An optional 8-position expansion wheel allows addition of extra spectral filters and/or neutral density (ND) filters for measurement of high-temperature objects (500-1000°C). Such flexibility is not available using continuous variable filter (CVF) based architectures.

Notes: 1. NE∆T is specified under the following conditions:

• IFOV = 1.7 mrad
  
  
• λ = 4 µm or 10 µm ± 2% ∆λ/λ
  
  
• Object Temperature = 25° C

Features:

The RAD9000 system consists of two primary modules: the Electro-Optics Module (EOM) and the Detector Radiometry Module (DRM). An optional Radiometric Reference Module (RRM) and Reference Control Module (RCM) are available to maximize radiometric accuracy.

The RAD9000 f/3 optical system features an all-reflective design with a large, 200 mm aperture. Field-of-View (FOV) is 1 degree (17 mrad), and accommodates a visible CCD sighting camera. IR detector Instantaneous FOV (IFOV) is 1.67 mrad, providing both sensitivity and spatial resolution. IFOV may be custom-configured by installation of different field stops. Computer-controlled focus from 3 m to infinity is provided, thereby supporting calibration of both “projector-level” test systems and stand-alone test assets (blackbodies, targets, etc.).

The DRM houses the IR detector-dewar assembly, low-noise preamp electronics, spectral filter wheel, and optional 8-position expansion wheel. MWIR and LWIR DRMs are available to support broadband IR radiometry applications. Each IR detector is housed in a pour-fill LN₂ dewar, with f/3 cold shield, broadband window, and 8-hour minimum hold time.

RAD9000 system control and an intuitive Graphical User Interface (GUI) are provided via the system host computer. The RAD9000 electronics architecture utilizes advanced DSP lock-in amplifier (LIA) technology to provide a sophisticated back-end electronic solution within a traditional “chopped” radiometric device.

The RAD9000 system software is modular for easy integration with automated test installations. The user can open, save, and load configuration files, and operate the RAD9000 with maximum flexibility. Measurement data can be viewed, stored, and exported in a variety of ways.

The RRM is an optional component designed specifically for the RAD9000. Though optimized for integrated use with the EOM for maximum radiometric accuracy, the RRM may also be operated as a stand-alone automated dual blackbody radiance standard. The RRM has two 8” x 8” extended source blackbodies, and provides variable temperature control from 5-100°C. The blackbodies feature a proprietary design and surface treatment, and exhibit both extremely high effective emissivity (≥ 0.998 from 2-14 μm) and virtually zero spectral and temperature dependence. These RRM sources feature automated PID control, and when used with the RAD9000 EOM, provide better than 0.5% absolute radiometric accuracy.

Specifications:


General System Specifications

Table 1: General System Specifications

Parameter/Component Specification Object Temperature Range 10° C to 100° C Thermal Sensitivity  ≤ 0.025° C1 Nominal Spectral Resolution (Δλ / λ) – 1.8% Instrument Control MS-Windows-based computer control , IEEE-488 interface, Network Controllable Shock/Vibration MIL-STD-648C and MIL-STD-810F

Table 2: General System Environmental Specifications

Operating Storage Temperature + 15° C to + 40° C -20° C to +85° C Relative Humidity 20% to 40% -- Optimal Temperature Range + 15° C to + 40° C --

¹ NE∆T is specified under the following conditions:

• IFOV = 1.7 mrad
• λ =  4 µm or 10 µm ± 2% ∆λ/λ
• Object Temperature = 25° C
  

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Note: Specifications are subject to change without notice. 

 

PDF Data Sheet:

See PDF Datasheet

Order Information:

Contact SBIR at (805) 965-3669 for order information.