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4564 results about "Wave shape" patented technology

Mass spectrometry with segmented RF multiple ion guides in various pressure regions

A mass spectrometer is configured with individual multipole ion guides, configured in an assembly in alignment along a common centerline wherein at least a portion of at least one multipole ion guide mounted in the assembly resides in a vacuum region with higher background pressure, and the other portion resides in a vacuum region with lower background pressure. Said multipole ion guides are operated in mass to charge selection and ion fragmentation modes, in either a high or low pressure region, said region being selected according to the optimum pressure or pressure gradient for the function performed. The diameter, lengths and applied frequencies and phases on these contiguous ion guides may be the same or may differ. A variety of MS and MS/MSn analysis functions can be achieved using a series of contiguous multipole ion guides operating in either higher background vacuum pressures, or along pressure gradients in the region where the pressure drops from high to low pressure, or in low pressure regions. Individual sets of RF, +/−DC and resonant frequency waveform voltage supplies provide potentials to the rods of each multipole ion guide allowing the operation of ion transmission, ion trapping, mass to charge selection and ion fragmentation functions independently in each ion guide. The presence of background pressure maintained sufficiently high to cause ion to neutral gas collisions along a portion of each multiple ion guide linear assembly allows the conducting of Collisional Induced Dissociation (CID) fragmentation of ions by axially accelerating ions from one multipole ion guide into an adjacent ion guide. Alternatively ions can be fragmented in one or more multipole ion guides using resonant frequency excitation CID. A multiple multipole ion guide assembly can be configured as the primary mass analyzer in single or triple quadrupole mass analyzers with or without mass selective axial ejection. Alternatively, the multiple multipole ion guide linear assembly can be configured as part of a hybrid Time-Of-Flight, Magnetic Sector, Ion Trap or Fourier Transform mass analyzer.

Compound waveform gasket for low closure force EMI shielding applications

A resilient EMI shielding and/or environmental sealing gasket for interposition between a first interface surface and an oppositely-disposed second interface surface. The gasket is formed of an elongate body of indefinite length which extends along a longitudinal axis. The body includes base and apex surfaces, and opposing first and second lateral surfaces which extend intermediate the base and apex surfaces. The base surface itself extends along the length the body as configured for proximally supporting the gasket on the first interface surface. The apex surface, in turn, extends radially from the longitudinal axis for distal contact with the second interface surface, and further extends along the longitudinal axis as defining a first waveform profile characterized as having a first periodic series of alternating first high and low amplitude intervals. The second lateral surface also extends along the longitudinal axis as defining a second waveform profile which is disposed generally transverse to the first waveform profile and which is similarly characterized as having a second periodic series of alternating second high and low amplitude intervals. The gasket so formed is deformable under a predetermined compressive force between the first and second interface surfaces into a stressed orientation characterized in that the body is deflected intermediate the base and apex surfaces.
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