Optical spectroscopy system using matched filter-based broadband signal receiver for stable data extraction, and method for controlling the optical spectroscopy system

Patent metadata

Field	Value
Publication number	US-10667756-B2
Application number	US-201415523022-A
Country	US
Kind code	B2
Filing date	Nov 14, 2014
Priority date	Oct 30, 2014
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

Disclosed are an optical spectroscopy system using a matched filter-based broadband signal receiver for stable data extraction, and a method for controlling the optical spectroscopy system. The optical spectroscopy system may comprise: a light transmission unit for irradiating light on a particular region of a subject by means of a plurality of light sources, wherein the light irradiated from the plurality of light sources is code-modulated by means of the Walsh codes and then irradiated; and a light receiving unit for detecting emergent light which has passed through the particular region, wherein the light source is identified by demodulating the light by means of the Walsh codes.

First claim

What is claimed is:

1. An optical spectroscopy system, comprising:
a light transmission unit configured to emit light to a specific region of a subject using a plurality of light sources, wherein the light emitted from the plurality of light sources is code-modulated using orthogonal codes; and
a light reception unit configured to detect light coming through the specific region, wherein the light is demodulated using the orthogonal codes to distinguish the light sources,
wherein the light reception unit comprises a pipeline-structured matched filter configured to extract one piece of data for each bit period by accumulating input signals in a continuous time domain using a reference clock used for the light emission as a sampling clock.

2. The optical spectroscopy system of claim 1 , wherein a chip rate and a unit code length of the orthogonal codes is determined based on a symbol rate and a hemodynamic frequency in a human body when the light is demodulated.

3. The optical spectroscopy system of claim 1 , wherein in the matched filter, bits received as inputs are matched with the light emitted using the reference clock, so that the bits received as inputs and the reference clock are synchronized without using an additional phase locked loop (PLL).

4. An optical spectroscopy system, comprising:
a light transmission unit configured to emit light to a specific region of a subject based on a reference clock generated according to a bit period of orthogonal codes; and
a light reception unit configured to detect light coming through the specific region,
wherein the light reception unit comprises a pipeline-structured matched filter configured to extract one piece of data for each bit period by accumulating input signals in a continuous time domain using the reference clock used for the light emission as a sampling clock.

5. The optical spectroscopy system of claim 4 , wherein in the matched filter, bits received as inputs are matched with the light emitted using the reference clock, so that the bits received as inputs and the reference clock are synchronized without using an additional phase locked loop (PLL).

6. A method for controlling an optical spectroscopy system, comprising the steps of:
by a light transmission unit included in the optical spectroscopy system, emitting light to a specific region of a subject using a plurality of light sources, wherein the light emitted from the plurality of light sources is code-modulated using orthogonal codes;
by a light reception unit included in the optical spectroscopy system, detecting light coming through the specific region, wherein the light is demodulated using the orthogonal codes to distinguish the light sources; and
by a pipeline-structured matched filter included in the light reception unit, extracting one piece of data for each bit period by accumulating input signals in a continuous time domain using a reference clock used for the light emission as a sampling clock.

7. The method of claim 6 , wherein in the matched filter, bits received as inputs are matched with the light emitted using the reference clock, so that the bits received as inputs and the reference clock are synchronized without using an additional phase locked loop (PLL).

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Bae Hyeon Min
• Choi Jong Kwan
• Choi Min Gyu
• Kim Jae Myoung
• Hwang Gun Pil

Classifications

• A61B5/14546

  for measuring analytes not otherwise provided for, e.g. ions, cytochromes · CPC title

• A61B5/7225

  Details of analogue processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation (input circuits for detecting, measuring, or recording bioelectric or biomagnetic signals A61B5/30; specific diagnostic methods using bioelectric or biomagnetic signals A61B5/316) · CPC title

• A61B5/0075

  by spectroscopy, i.e. measuring spectra, e.g. Raman spectroscopy, infrared absorption spectroscopy (A61B5/0071 takes precedence) · CPC title

• G01N21/359

  using near infrared light · CPC title

• G01N2201/06113

  Coherent sources; lasers · CPC title