Specification Sheet.pdf

INTEGRATING SPHERE INSTRUMENT SPECIFICATIONS

I. BACKGROUND

The ARS Environmental Microbial and Food Safety Laboratory (EMFSL) in Beltsville, Maryland plans to purchase an integrating sphere measurement instrument brand name or equal to the Labsphere HELIOS Plus Variable Output System, model: USLR-V12F-NDNN-P for radiometric calibration of the hyperspectral cameras to be used on drones for preharvest food safety inspection of produce fields. Since the hyperspectral cameras will be used under variable outdoor conditions, the integrating sphere instrument must have high dynamic range (>=4 orders), high spatial luminance uniformity over exit port (<=±1%), broad spectral radiance (350-2400 nm), and high measurement resolution (<=3 lux) to achieve the acceptable radiometric calibration results.

II. REQUIREMENTS

The integrating sphere instrument must be capable of the following:

• Spatial luminance uniformity over exit port: <=±1%

• Angular uniform field of view (full angle): <=±2%

• Expected luminance output: >= 11,000 cd/m2

• Expected illuminance at port: >= 35,000 lux

• Peak radiance: >= 350 W/m2-sr-um

• Peak irradiance: >=1.5E+21

• Minimum resolution: <=3 lux

• Dynamic range: >=10,000

• Typical lamp lifetime: >500 hours

• Lamp degradation over lifetime: <=-10%

• Output Degradation over 50 hours: <=-1%

• Sphere internal diameter: >= 12 inches

• Spectral radiance range: 350-2400 nm

• Operational duration of calibration: >=50 hours

• SDK API for advanced functionality with LabVIEW, C++, and MATLAB