J Harder et al 2000 Metrologia 37 415 doi:10.1088/0026-1394/37/5/15
J Harder, G M Lawrence, G Rottman and T Woods
Show affiliationsThe Spectral Irradiance Monitor (SIM) will measure the solar spectral irradiance between 0.2 µm to 2.0 µm to a relative standard uncertainty of 3 × 10−4 (1 s) and with a noise level of <1 × 10−4. The instrument will be launched in 2002 on the SORCE mission of the Earth Observing System (EOS). Sunlight passes through a 0.3 mm × 7 mm entrance slit and is modulated by a shutter at 0.1 Hz. Light then travels 400 mm to a Fery prism that disperses and focuses the light at the focal plane containing five separate exit slits, with an electrical-substitution radiometer (ESR) and four photodiode detectors. The ESR consists of two back-to-back 1 mm × 10 mm diamond bolometers blackened with nickel phosphorus. The bolometer bridge, electrical power replacement, ESR temperature regulation, and prism rotation are under digital signal processor control. The measurement equation and the uncertainty budget for the SIM instrument are presented along with plans for the pre-flight characterization of the instrument.
06.20.Dk Measurement and error theory
85.60.Dw Photodiodes; phototransistors; photoresistors
93.85.-q Instruments and techniques for geophysical research: Exploration geophysics
07.60.Dq Photometers, radiometers, and colorimeters
07.57.Kp Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors
Instrumentation and measurement
Issue 5 (October 2000)
J Harder et al 2000 Metrologia 37 415
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