MEMS-based spectrophotometric system

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C359S290000

Reexamination Certificate

active

06872947

ABSTRACT:
A portable spectrophotometric system for detecting one or more target substances. In a representative embodiment, a system of the invention has an optical grating, an array of photo-detectors, and a MEMS device having a movable plate positioned between the grating and the array. Light transmitted through a gaseous sample is dispersed by the grating and is imaged onto the movable plate, which has a plurality of openings corresponding to selected infrared absorption lines of the target substance. A small-amplitude oscillation is imparted onto the plate such that the openings periodically move in and out of alignment with the corresponding intensity features in the image, which modulates electrical signals generated by the corresponding photo-detectors. A lock-in signal processor analyzes the modulation pattern by comparing it to the pattern expected in the presence of the target substance. When a positive correlation between the patterns is established, the system warns the user about the presence of the target substance.

REFERENCES:
patent: 5173749 (1992-12-01), Tell et al.
patent: 5501893 (1996-03-01), Learmer et al.
patent: 5512757 (1996-04-01), Cederstrand et al.
patent: 5629790 (1997-05-01), Neukermans et al.
patent: 5936250 (1999-08-01), Baliga et al.
patent: 6064488 (2000-05-01), Brand et al.
patent: 6201631 (2001-03-01), Greywall
patent: 6344648 (2002-02-01), Boucher et al.
patent: 6509566 (2003-01-01), Wamsley 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

MEMS-based spectrophotometric system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with MEMS-based spectrophotometric system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and MEMS-based spectrophotometric system will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3436411

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