EP0781990A1
Expired / Lapsed
EP
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Scattered light measuring apparatus
Assignee: Arkray Inc
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Filing: 1996-12-27
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Granted: —
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Expires: 2016-12-27
Abstract
Abstract A Raman scattered light measuring apparatus comprises a near infrared semiconductor laser diode(1a) as a light source for irradiating a sample with excitation light, while a photoreceiving part for receiving Raman scattered light from the sample comprises a bandpass filter(6) having a vibration wavenumber which is specific to a sample component to be measured as a central wavelength of its transmission region, and a detector(7a) consisting of a photodiode of Ge, InAs or InGaAs or a photomultiplier having sensitivity in a near infrared region for detecting Raman scattered light which is transmitted through the bandpass filter(6).
Inventors
- 👤 Yukihiro Ozaki
- 👤 Xiaoming Dou
- 👤 Yoshinori Yamaguchi
- 👤 Harumi Uenoyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 23:36
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/65; G01N2021/651; G01N2201/00; G01N2201/06; G01N2201/065
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
A Raman scattered light measuring apparatus for irradiating a sample in a sample part(4) with excitation light from a light source part(1) and detecting Raman scattered light from said sample in a photoreceiving part thereby measuring a target component in said sample, characterized in that said photoreceiving part consisting of a bandpass filter(6) including a specific vibration wavenumber of said target component in said sample to be measured in its transmission band or a cut filter being so combined as to transmit said vibration wavenumber, and a detector(7a) for detecting said Raman scattered light being transmitted through said bandpass filter(6) or said cut filter.
Claim 2
Dependent Claim
38 words
The Raman scattered light measuring apparatus in accordance with claim 1, wherein said light source part(1) comprises a near infrared semiconductor laser diode as a light source, said detector(7a) comprising a photodetector consisting of Ge, InGaAs or PbS.
Claim 3
Dependent Claim
39 words
The Raman scattered light measuring apparatus in accordance with claim 1, wherein said light source part(1) comprises a near infrared semiconductor laser diode as a light source, said detector(7a) comprising a photomultiplier having sensitivity in a near infrared region.
Claim 4
Dependent Claim
67 words
The Raman scattered light measuring apparatus in accordance with claim 1, further comprising a beam splitter(11) being provided on an optical path between said light source part(1) and said sample part(4) for taking out part of said excitation light and a detector(7b) for detecting taken-out said excitation light, an output signal of said detector(7a) of said photoreceiving part being corrected by the intensity of said excitation light.
Claim 5
Dependent Claim
51 words
The Raman scattered light measuring apparatus in accordance with claim 1, wherein said light source part(1) comprises a visible light source, and said photoreceiving part comprises a silicon photodetector or a photomultiplier as said detector(7a) for detecting said Raman scattered light being transmitted through said bandpass filter(6) or said cut filter.
Claim 6
Dependent Claim
27 words
The Raman scattered light measuring apparatus in accordance with claim 2, wherein said near infrared semiconductor laser diode has an oscillation wavelength of at least 800 nm.
Claim 7
Dependent Claim
27 words
The Raman scattered light measuring apparatus in accordance with claim 3, wherein said near infrared semiconductor laser diode has an oscillation wavelength of at least 800 nm.
Claim 8
Dependent Claim
41 words
The Raman scattered light measuring apparatus in accordance with claim 1, wherein said bandpass filter(6) has spectro-optic characteristics of a mathematical approximate function of the waveform of a target peak of a Raman scattering spectrum or a function being close thereto.
Claim 9
Dependent Claim
24 words
The Raman scattered light measuring apparatus in accordance with claim 8, wherein said bandpass filter(6) has spectro-optic characteristics of a Gaussian or Lorentz function.
Claim 10
Dependent Claim
24 words
The Raman scattered light measuring apparatus in accordance with claim 8, wherein two said bandpass filters(6) are overlapped with each other to be employed.
Claim 11
Dependent Claim
32 words
The Raman scattered light measuring apparatus in accordance with claim 1, wherein said sample part comprises an integrating sphere type scattered light reinforcing holder(4a) as a holder for holding a sample cell(4b).
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