US 10,119,917 B2Granted

Apparatus and method for bidirectional Raman spectroscopy

AssigneeB&W Tek LLC

InventorsJun Zhao, Xin Jack Zhou, Sean Xiaolu Wang

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Abstract

This invention relates to an apparatus and method for performing bidirectional Raman spectroscopy of a sample, preferably a diffusely scattering sample, in which two excitation light sources are employed to illuminate the sample from two opposite directions to excite Raman scattering signal from the sample. The Raman scattering signal which transmits through the sample are collected by two optical devices each positioned on the opposite side of the sample to obtain two transmission Raman spectra of the sample, which enables the accurate determination of the composition of the whole sample.

Claims14

Dependent claims

An apparatus for analyzing the properties of a diffusely scattering subject, the apparatus comprising:

a first light source for producing a first excitation light;
a first reflective cavity with a specular reflective surface, the first reflective cavity having a first aperture and a second aperture, the first aperture of the first reflective cavity is configured to receive the first excitation light, the second aperture of the first reflective cavity is configured to be applied close to the subject such that the first reflective cavity substantially forms an enclosure covering a first area of the subject, wherein the first excitation light projects from the first aperture onto the second aperture of the first reflective cavity to illuminates the first covered area of the subject from a first direction to excite a first Raman scattered light;
a first optical device configured to measure a portion of the first Raman scattered light which transmits through the subject in the first direction to obtain a first Raman spectrum;
a second light source for producing a second excitation light;
a second reflective cavity with a specular reflective surface, the second reflective cavity having a first aperture and a second aperture, the first aperture of the second reflective cavity is configured to receive the second excitation light, the second aperture of the second reflective cavity is configured to be applied close to the subject such that the second reflective cavity substantially forms an enclosure covering a second area of the subject, wherein the second excitation light projects from the first aperture onto the second aperture of the second reflective cavity to illuminates the second covered area of the subject from a second direction opposite to the first direction to excite a second Raman scattered light;
a second optical device configured to measure a portion of the second Raman scattered light which transmits through the subject in the second direction to obtain a second Raman spectrum;
and
a processor unit configured to analyze both the first Raman spectrum and the second Raman spectrum to analyze the properties of the subject.

5 more elements

A method for analyzing the properties of a diffusely scattering subject, the method comprising the steps of:

producing a first excitation light;
providing a first reflective cavity with a specular reflective surface, the first reflective cavity having a first aperture and a second aperture, the first aperture of the first reflective cavity is configured to receive the first excitation light, the second aperture of the first reflective cavity is configured to be applied close to the subject such that the first reflective cavity substantially forms an enclosure covering a first area of the subject, wherein the first excitation light projects from the first aperture onto the second aperture of the first reflective cavity to illuminates the first covered area of the subject from a first direction to excite a first Raman scattered light;
measuring a portion of the first Raman scattered light which transmits through the subject in the first direction to obtain a first Raman spectrum;
producing a second excitation light;
providing a second reflective cavity with a specular reflective surface, the second reflective cavity having a first aperture and a second aperture, the first aperture of the second reflective cavity is configured to receive the second excitation light, the second aperture of the second reflective cavity is configured to be applied close to the subject such that the second reflective cavity substantially forms an enclosure covering a second area of the subject, wherein the second excitation light projects from the first aperture onto the second aperture of the second reflective cavity to illuminates the second covered area of the subject from a second direction opposite to the first direction to excite a second Raman scattered light;
measuring a portion of the second Raman scattered light which transmits through the subject in the second direction to obtain a second Raman spectrum;
and
analyzing the first Raman spectrum and the second Raman spectrum to analyze the properties of the subject.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/653,636Filed 19 Jul 2017 · continuation in part
Priority: 11 Nov 2016
Published: US 2018/0136131 A117 May 2018
Granted: 6 Nov 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

G01N 21/658
Raman scattering: enhancement Raman, e.g. surface plasmons
G01J 3/0208
Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows: using focussing or collimating elements, e.g. lenses or…
G01J 3/021
Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows: using plane or convex mirrors, parallel phase plates, or…
G01J 3/0229
Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows: using masks, aperture plates, spatial light modulators or…

Family

Application15/349,510Parent of this continuation-in-part · filed 11 Nov 2016
Application15/378,156Parent of this continuation-in-part · filed 14 Dec 2016
Application15/461,613Parent of this continuation-in-part · filed 17 Mar 2017
US 2018/0136138 A1Pre-grant publication · published 17 May 2018
US 10,113,969 B2Related patent
US 10,119,916 B2Related patent
US 10,126,244 B2Related patent
US 2018/0136131 A1Published application
US 2018/0136132 A1Published application
US 2018/0136133 A1Published application
US 10,119,917 B2This patent

From the US filing history. Foreign family members aren’t listed.

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