ISUAL Spectrophotometer Overview S Harris NCKU UCB Tohoku
ISUAL Spectrophotometer Overview S. Harris NCKU UCB Tohoku IFR 5 Mar 2001 Spectrophotometer S. Harris
Spectrophotometer Description • Six Channels Identical except for Spectral Bandpass • 50 mm f/2 Lens • Aperture limits FOV to 20 deg X 5 deg • Uses Ruggedized EMR Photomultiplier Tubes • Individually Adjustable HV for each Unit • Six Co-aligned Modules Packaged with HV and Pre. Amps as one Unit • Remainder of Electronics contained in AEP NCKU UCB Tohoku IFR 5 Mar 2001 Spectrophotometer S. Harris 2
Mechanical Layout of One Channel NCKU UCB Tohoku IFR 5 Mar 2001 Spectrophotometer S. Harris 3
One Channel Solid Model NCKU UCB Tohoku IFR 5 Mar 2001 Spectrophotometer S. Harris 4
Spectrophotometer Optical Data SP Channels 1&2 • 1 -- Bandpass: 150 - 280 nm • No filter used • EMR type 541 PMT • Rubidium Telluride photocathode • Sapphire window • 2 -- Bandpass: 250 - 390 nm • • NCKU Barr UG-5 glass filter EMR type 541 PMT Bi-alkali photocathode Magnesium Fluoride window UCB Tohoku IFR 5 Mar 2001 Spectrophotometer S. Harris 5
Spectrophotometer Optical Data SP Channels 3&4 • 3 -- Center: 337 nm • • • Barr interference filter EMR type 741 PMT Bi-alkali photocathode Sapphire window 4 -- Center: 427. 8 nm • • NCKU Barr interference filter EMR type 741 PMT Bi-alkali photocathode Sapphire window UCB Tohoku IFR 5 Mar 2001 Spectrophotometer S. Harris 6
Spectrophotometer Optical Data SP Channels 5&6 • 5 -- Bandpass: 665 - 900 nm • • • Notch at 754 - 790 nm Barr interference filter EMR type 741 PMT Tri-alkali photocathode Sapphire window 6 -- Center: 777. 4 nm • • NCKU Barr interference filter EMR type 741 PMT Tri-alkali photocathode Sapphire window UCB Tohoku IFR 5 Mar 2001 Spectrophotometer S. Harris 7
Mechanical Layout of Complete Unit NCKU UCB Tohoku IFR 5 Mar 2001 Spectrophotometer S. Harris 8
SP Unit Solid Model NCKU UCB Tohoku IFR 5 Mar 2001 Spectrophotometer S. Harris 9
Spectrophotometer Thermal Control • HVPS heat conducted to side walls and thence to top • Photomultiplier Heat also conducted to side walls & top • Electronics heat conducted thru PCB to side wall mounts • Filter heater assemblies are insulated with a G-10 ring NCKU UCB Tohoku IFR 5 Mar 2001 Spectrophotometer S. Harris 10
Spectrophotometer Analog Electronics • • NCKU Pre-amp/line driver, HV only Integrator and ADC in AEP UCB Tohoku IFR 5 Mar 2001 Spectrophotometer S. Harris 11
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