Systems and methods for digital detection of a tomographic...

Optics: measuring and testing – By light interference – For dimensional measurement

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C356S479000

Reexamination Certificate

active

07728986

ABSTRACT:
Systems and methods for digital detection of an analog tomographic signal are described. The methods include receiving an amplitude-modulated analog signal containing tomographic information, the analog signal having a modulation frequency, fλi; and converting the analog signal into a digital signal at a sampling frequency, fs, to produce a number of samples, K. The digital signal is multiplied by an in-phase reference signal to obtain an in-phase signal component, the in-phase reference signal having the frequency, fλi; and the digital signal is multiplied by a quadrature reference signal to obtain a quadrature signal component, the quadrature reference signal having the frequency, fλi. The in-phase signal component and the quadrature signal component are passed through the K-point averaging filter. A signal amplitude is computed based on the filtered in-phase signal component and the filtered quadrature signal component, the signal amplitude being representative of the tomographic information.

REFERENCES:
patent: 4807146 (1989-02-01), Goodrich et al.
patent: 5746211 (1998-05-01), Leigh et al.
patent: 6011401 (2000-01-01), Henry et al.
patent: 6549284 (2003-04-01), Boas et al.
patent: 6795195 (2004-09-01), Barbour et al.
patent: 6816102 (2004-11-01), Pavicic
patent: 7463362 (2008-12-01), Lasker et al.
patent: 2005/0243322 (2005-11-01), Lasker et al.
patent: 2008/0154126 (2008-06-01), Culver et al.
patent: 2009/0103102 (2009-04-01), Lasker et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Systems and methods for digital detection of a tomographic... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Systems and methods for digital detection of a tomographic..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Systems and methods for digital detection of a tomographic... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-4164511

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.