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A FABRY-PEROT CAVITY PULSED FOURIER TRANSFORM W-BAND SPECTROMETER WITH A PULSED NOZZLE SOURCE

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/33307

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Title: A FABRY-PEROT CAVITY PULSED FOURIER TRANSFORM W-BAND SPECTROMETER WITH A PULSED NOZZLE SOURCE
Creators: Grubbs, Garry S., II; Dewberry, Christopher T.; Cooke, Stephen A.
Issue Date: 2008
Abstract: We will present the design and operation of a simple Balle-Flygare-type spectrometer operable between 75 and 110 GHz (W-band). W-band frequencies are generated through the use of active multiplier chains. The circuit uses single side-band modulation with an IF of 180 MHz. The Fabry-Perot cavity consists of two opposing spherically concave mirrors, 70 mm in diameter with a 250 mm radius of curvature. The mirrors have been machined from copper and diamond polished to achieve a maximum surface defect of 135 nm. A solenoid valve admits pulses of gas into the cavity which is housed in a small vacuum chamber maintained at a resting pressure of $<$10$^{-7}$ bar using a turbomolecular pump. The instruments use and sensitivity will be demonstrated using some simple gas phase species.
URI: http://hdl.handle.net/1811/33307
Other Identifiers: 2008-WF-10
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