SPECIFICATIONS OF THE UNITED STATES ANTARCTIC PROGRAM'S 

 EQUIPMENT SYSTEM FOR MONITORING UV RADIATION 



GARY W. HARRIS 



Research Instrument Systems 



5355 S. El Camino Dr. 



Tempe, AZ 85283 



The versatile, laboratory-based equipment system developed for the United States 

 Antarctic Program incorporates a scanning spectroradiometer and is designed for 

 high sensitivity and long-term stability under conditions of continuous use. The 

 system can be set to take data, intensity-calibration and wavelength-calibration 

 scans at preprogrammed times during a 24-hour period. The system can then 

 operate unattended until disc space on the controlling computer is filled. As 

 presently configured, the system meets the following specifications: 



MONOCHROMETER TYPE: Double 0.1 m; holographic gratings; 250-nm blaze 



STRAY LIGHT: 2x10"^ at 8 bandwidths from 632.8-nm laser line 



WAVELENGTH RANGE: 250 - 650 nm 



WAVELENGTH RESOLUTION: 0.05 nm/step 



WAVELENGTH RESOLUTION: 0.05 nm/step 



WAVELENGTH ACCURACY: +/- 0.5 nm 



WAVELENGTH PRECISION: +/- 0.2 nm 



BANDWIDTH: 1.1 nm with 0.167-nm slits supplied 



ENTRANCE OPTICS: Integrating sphere with integral wavelength and intensity 

 calibration sources. When mounted into a roofbox, it includes a shutter 

 mechanism, and quartz dome to seal out moisture. Entrance optics may be updated 

 in the future. A teflon diffuser assembly is presently being evaluated to reduce 

 distortions caused by the quartz dome. 



SCAN SPEED: 0.02 - 25 nm/sec; computer controlled 



DETECTOR: Photomul tipl ier tube in shielded, cooled housing 



AMPLIFIER SENSITIVITY: 10"^^ - 10'^ amps 



DYNAMIC RANGE: 10"^ 



INTEGRATION TIME: 0.001 - 64 sec; computer controlled 



HIGH VOLTAGE: - 2000 volts; computer controlled 



PHOTON COUNTING: H 

 computer controlled 



PHOTON COUNTING: 10^ counts/sec maximum; count integration time 0.001 - 64 sec; 



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