Method and apparatus for tracking a resonant frequency

Details Method and apparatus for tracking a resonant frequency Method and apparatus for tracking a resonant frequency

2006-08-15

2006-08-15

Williams, Hezron (Department: 2856)

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

C073S597000, C073S602000

Reexamination Certificate

active

07089794

ABSTRACT:
An arrangement for tracking resonant frequency of electrically resonant structures through a single channel includes a variable frequency oscillator associated with each resonant structure which provides an excitation signal of a variable frequency encompassing a possible resonant frequency of the associated resonant structure. Coupling device(s) are provided which connect each variable frequency oscillator to said resonant structure(s). An I-mixer is provided for each oscillator which forms a synchronous detector, a first input of each I-mixer being connected to its associated oscillator and a second input being connected to the coupling device, each I-mixer mixing the excitation signal from the associated variable frequency oscillator with a response signal generated by the resonant structure(s) in response to each excitation signal. The output of each I-mixer is filtered to remove sum products of the excitation and response signals, thereby leaving an amplitude modulation component of the signal, which is processed in a control loop to track the resonant frequency of each resonant structure.

REFERENCES:
patent: 5585571 (1996-12-01), Lonsdale et al.
patent: 5585574 (1996-12-01), Sugihara et al.
patent: 5909456 (1999-06-01), Oka
patent: 6433541 (2002-08-01), Lehman et al.
patent: 6467351 (2002-10-01), Lonsdale et al.
patent: 6581478 (2003-06-01), Pahl et al.
patent: 6621264 (2003-09-01), Lehman et al.
patent: 6628177 (2003-09-01), Clark et al.
patent: 6630871 (2003-10-01), Ma et al.
patent: 6903489 (2005-06-01), Suzuki et al.
patent: 2355801 (2001-05-01), None
patent: WO 98/21818 (1998-05-01), None
patent: WO 01/46684 (2001-06-01), None
U. Wolff et al., “SAW Sensors for Harsh Environments”, IEEE Sensors Journal, vol. 1, No. 1, Jun. 2001, pp. 4-13.

Affiliated with

Also associated with

Rating

Method and apparatus for tracking a resonant frequency 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 and apparatus for tracking a resonant frequency, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for tracking a resonant frequency will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3696903