Radiant energy – Ionic separation or analysis – Methods
Patent
1994-07-27
1995-09-12
Anderson, Bruce C.
Radiant energy
Ionic separation or analysis
Methods
250292, B01D 5944, H01J 4940
Patent
active
054499054
ABSTRACT:
A method for generating a filtered noise signal, which includes the steps of generating a broadband signal having optimized (reduced or minimized) dynamic range, and filtering the broadband signal in a notch filter to generate a broadband signal whose frequency-amplitude spectrum has one or more notches (the "filtered noise" signal). In preferred embodiments, the filtered noise signal is a voltage signal suitable for application to an ion trap during a mass spectrometry operation. The invention enables rapid generation of different filtered noise signals (for use in different mass spectrometry experiments) by filtering a single, optimized broadband signal using a set of different notch filters, each having a simple, easily implementable design. The invention enables rapid generation of filtered noise signals (for example, in real time during mass spectrometry experiments) without prior knowledge of the mass spectrum of unwanted ions to be ejected from a trap during application of the filtered noise signal to the trap. The invention also enables rapid generation of a filtered noise signal having no missing frequency components outside the notches of the notch filter employed to generate the filtered noise signal. Digital values indicative of the amplitude, frequency, and phase of each sinusoidal (or other periodic) component of an optimized broadband signal can be iteratively generated by a digital computer in accordance with the invention, and the digital values can then be processed to generate an analog version of the optimized broadband signal.
REFERENCES:
patent: 4540884 (1985-09-01), Stafford et al.
patent: 4736101 (1988-04-01), Syka et al.
patent: 4749860 (1988-06-01), Kelly et al.
patent: 4761545 (1988-08-01), Marshall et al.
patent: 4771172 (1988-09-01), Weber-Grabau et al.
patent: 4818869 (1989-04-01), Weber-Grabau
patent: 4882484 (1989-11-01), Franzen et al.
patent: 4945234 (1990-07-01), Goodman et al.
patent: 4959543 (1990-09-01), McIver et al.
patent: 4975577 (1990-12-01), Franzen et al.
patent: 5013912 (1991-05-01), Guan et al.
patent: 5075547 (1991-12-01), Johnson et al.
patent: 5105081 (1992-04-01), Kelley
patent: 5134286 (1992-07-01), Kelley
patent: 5187365 (1993-02-01), Kelley
patent: 5248882 (1993-09-01), Liang
patent: 5324939 (1994-06-01), Louris et al.
Dawson, et al., "Non-Linear Resonance in Quadrupole Mass Spectrometers Due to Imperfect Fields, I. The Quadrupole Ion Trap", International Journal of Mass Spectrometry and Ion Physics, 2 (1969), pp. 45-59.
Wang, et al., "Extension of Dynamic Range in Fourier Transform Ion Cyclotron Resonance Mass Spectrometry Via Stored Memory Inverse Fourier Transform Excitation," Anal. Chem. 1986, 5B, pp. 2935-2938.
Hoekman Doneil J.
Kelley Paul E.
Anderson Bruce C.
Teledyne ET
LandOfFree
Method for generating filtered noise signal and broadband signal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for generating filtered noise signal and broadband signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for generating filtered noise signal and broadband signal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-407177