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Title: Ion detection electrode arrangement

Abstract: An electrode arrangement for the detection of species ionized by radiant energy from a radiation source, comprising: an annular cathode; a shield, opaque to the radiant energy, extending across the cathode and having an aperture smaller than and coaxial with the annulus formed by the cathode; and an elongated anode having its distal end coaxially of the cathode and the shield aperture, the cathode being shielded from and the anode being exposed to the radiant energy from the radiation source.


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Inventors: Driscoll, John N. (Natick, MA, US)
Spaziani, Frederick F. (Lexington, MA, US)

Application Number: 650531
Filing Date: 1976-01-19
Publication_date: 1977-03-22
Assignee: HNU Systems Inc. (Newton Upper Falls, MA)
Primary Class(es): 313/242 250/373, 250/374, 250/423P, 313/240, 313/241
Other Classes:
US Patent Ref:
3591801Jul, 1971Watson et al.250/373.
3918811Nov, 1975Allington250/373.

Other Refs:
Primary Examiner: Chatmon, Jr., Saxfield
Assistant Examiner:
Attorney: