Apparatus and method for noise reduction in modulated...

Optics: measuring and testing – For light transmission or absorption

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C324S754210, C324S754230, C372S038100, C372S038010

Reexamination Certificate

active

07920265

ABSTRACT:
In a modulated optical reflectance (MOR) system, a laser noise suppression technique utilizes a reference beam split optically from a probe laser prior to injection of a beam from the probe laser into an MOR signal path. The reference beam and a probe beam reflected from the sample are sent to first and second detectors, which produce first and second signals. A signal combiner receives the second signal at a first input and produces a combiner signal that corresponds to a difference between signals applied to the first and a second input. A level balancer receives the first signal and a signal derived from the combiner signal and produces a balancer output that is coupled to the second input of the signal combiner. The combination of the balancer output and the second signal tends to cancel out an average value of the second signal from the combiner signal.

REFERENCES:
patent: 4237427 (1980-12-01), Holland
patent: 4795260 (1989-01-01), Schuur et al.
patent: 5074669 (1991-12-01), Opsal
patent: 5134276 (1992-07-01), Hobbs
patent: 6784731 (2004-08-01), Zhang
patent: 7130055 (2006-10-01), Borden et al.
patent: 7141440 (2006-11-01), Borden et al.
Philip D. C. Hobbs, “Ultrasensitive Laser Measurement without Tears”—Applied Optics, vol. 36, No. 4, pp. 903-920, Feb. 1, 1997.

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

Apparatus and method for noise reduction in modulated... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for noise reduction in modulated..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for noise reduction in modulated... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2694542

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