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GB2008745A - Spectrophotometer - Google Patents

Spectrophotometer

Info

Publication number
GB2008745A
GB2008745A GB7846495A GB7846495A GB2008745A GB 2008745 A GB2008745 A GB 2008745A GB 7846495 A GB7846495 A GB 7846495A GB 7846495 A GB7846495 A GB 7846495A GB 2008745 A GB2008745 A GB 2008745A
Authority
GB
United Kingdom
Prior art keywords
radiation
filters
pair
sample
reference wavelengths
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB7846495A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ANACON INSTR Ltd
Original Assignee
ANACON INSTR Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ANACON INSTR Ltd filed Critical ANACON INSTR Ltd
Priority to GB7846495A priority Critical patent/GB2008745A/en
Publication of GB2008745A publication Critical patent/GB2008745A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

In a method of spectrophotometric analysis e.g. using radiation in the IR region, radiation is passed to the sample alternately through each of a pair of filters one passing radiation at at least one measuring wavelength and one passing radiation of at least two reference wavelengths, and the radiation absorbed or reflected by the sample is sensed with each filter in the radiation path. The detector outputs are combined in a differential amplifier. For moisture content the measurement wavelength used is 1.4 mu and the two reference wavelengths 1.2 and 1.6 mu . More than one pair of filters may be used. Numerous examples of substances that can be detected are given. <IMAGE>
GB7846495A 1977-11-03 1978-11-29 Spectrophotometer Withdrawn GB2008745A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7846495A GB2008745A (en) 1977-11-03 1978-11-29 Spectrophotometer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4579277 1977-11-03
GB7846495A GB2008745A (en) 1977-11-03 1978-11-29 Spectrophotometer

Publications (1)

Publication Number Publication Date
GB2008745A true GB2008745A (en) 1979-06-06

Family

ID=26265671

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7846495A Withdrawn GB2008745A (en) 1977-11-03 1978-11-29 Spectrophotometer

Country Status (1)

Country Link
GB (1) GB2008745A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2479982A1 (en) * 1980-04-08 1981-10-09 California Inst Of Techn METHOD AND APPARATUS FOR INSTANTLY ESTABLISHING THE RELATIONSHIP BETWEEN BANDS FOR REFLECTION RADIOMETER
GB2127541A (en) * 1982-09-27 1984-04-11 Imp Group Plc Monitoring sheet material
EP0046783B1 (en) * 1980-02-19 1985-01-30 A/S N. Foss Electric A method fpr quantitatively determining components in a sample
GB2163251A (en) * 1984-07-19 1986-02-19 Elektrisk Bureau As Infrared gas detector
FR2620228A1 (en) * 1987-09-04 1989-03-10 Trefimetaux Method and device for non-destructive measurement of the cupric (copper (II)) oxide/cuprous (copper (I)) oxide ratio on the oxidised internal wall of a copper tube
EP0304230A3 (en) * 1987-08-21 1989-12-20 The British Petroleum Company P.L.C. Optical measurement method
US5126570A (en) * 1988-09-27 1992-06-30 The Standard Oil Company Sensor and method for measuring alcohol concentration in an alcohol-gasoline mixture
WO1992018847A1 (en) * 1991-04-12 1992-10-29 Servomex (Uk) Ltd. Method and apparatus for determining the concentration of a particular constituent of a fluid
WO1999019712A1 (en) * 1997-10-10 1999-04-22 Zellweger Analytics Limited Optical gas detection
WO1999040412A1 (en) * 1998-02-06 1999-08-12 Bg Intellectual Property Limited Method and apparatus to detect the presence of water on a surface
GB2334097B (en) * 1998-02-06 2002-08-07 British Gas Plc Method and apparatus to detect the presence of water on a surface

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0046783B1 (en) * 1980-02-19 1985-01-30 A/S N. Foss Electric A method fpr quantitatively determining components in a sample
FR2479982A1 (en) * 1980-04-08 1981-10-09 California Inst Of Techn METHOD AND APPARATUS FOR INSTANTLY ESTABLISHING THE RELATIONSHIP BETWEEN BANDS FOR REFLECTION RADIOMETER
GB2127541A (en) * 1982-09-27 1984-04-11 Imp Group Plc Monitoring sheet material
US4718026A (en) * 1982-09-27 1988-01-05 Imperial Group, Plc Monitoring sheet material
GB2163251A (en) * 1984-07-19 1986-02-19 Elektrisk Bureau As Infrared gas detector
EP0304230A3 (en) * 1987-08-21 1989-12-20 The British Petroleum Company P.L.C. Optical measurement method
US5124553A (en) * 1987-08-21 1992-06-23 The Standard Oil Company Optical measurement method using stacked germanium and silicone detectors
FR2620228A1 (en) * 1987-09-04 1989-03-10 Trefimetaux Method and device for non-destructive measurement of the cupric (copper (II)) oxide/cuprous (copper (I)) oxide ratio on the oxidised internal wall of a copper tube
US5126570A (en) * 1988-09-27 1992-06-30 The Standard Oil Company Sensor and method for measuring alcohol concentration in an alcohol-gasoline mixture
WO1992018847A1 (en) * 1991-04-12 1992-10-29 Servomex (Uk) Ltd. Method and apparatus for determining the concentration of a particular constituent of a fluid
WO1999019712A1 (en) * 1997-10-10 1999-04-22 Zellweger Analytics Limited Optical gas detection
US6455854B1 (en) * 1997-10-10 2002-09-24 Zellweger Analytics Limited Infrared radiation detector for monitoring the presence of alkanes
WO1999040412A1 (en) * 1998-02-06 1999-08-12 Bg Intellectual Property Limited Method and apparatus to detect the presence of water on a surface
AU744111B2 (en) * 1998-02-06 2002-02-14 Lattice Intellectual Property Limited Method and apparatus to detect the presence of water on a surface
GB2334097B (en) * 1998-02-06 2002-08-07 British Gas Plc Method and apparatus to detect the presence of water on a surface
US6680479B1 (en) 1998-02-06 2004-01-20 Lattice Intellectual Property Limited Method and apparatus to detect the presence of water on a surface

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)