Browse Prior Art Database

Spectrum Display Expansion

IP.com Disclosure Number: IPCOM000093000D
Original Publication Date: 1967-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

DaSilva, EM: AUTHOR [+2]

Abstract

This scope display system relates to control circuitry for use to separate and display selected intervals of the mass spectra produced by a residual gas analyzer. Frequently it is desirable to observe with greater resolution only particular segments of the spectra while holding other segments and eliminating intervals of no interest. The circuit increases the trace length available for displaying a mass interval by omitting those sections of the spectra which are of no interest.

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Spectrum Display Expansion

This scope display system relates to control circuitry for use to separate and display selected intervals of the mass spectra produced by a residual gas analyzer. Frequently it is desirable to observe with greater resolution only particular segments of the spectra while holding other segments and eliminating intervals of no interest. The circuit increases the trace length available for displaying a mass interval by omitting those sections of the spectra which are of no interest.

As shown at the left, gas analyzer scope mode controls include a manual position potentiometer setting A1 and an extent of sweep width potentiometer setting A2. These controls are duplicated at B1 and B2. Switch SW brings the control potential for ion acceleration VIA into switch terminals 1 or 2 as determined by the position of SW.

Although shown diagramatically, SW can be electronic in nature and capable of instantaneous operations.

Referring to the drawing of ion potential versus time at the right, if it is assumed first that controls A1 and A2 are set to sweep the entire mass range from interval 2 to 50, then the plot of the ion accelerting potential appears as shown in curve 1. Similarly, assuming that controls B1 and B2 are set to sweep through the mass range 8 through 50, the ion acceleration control curve becomes curve 2.

If selective interval expansion be desired, SW is used. Beginning with the first interval sweep with SW in position 1, the potential r...