GB1528418A - Determining monomer content in pmma elements - Google Patents

Determining monomer content in pmma elements

Info

Publication number
GB1528418A
GB1528418A GB2437176A GB2437176A GB1528418A GB 1528418 A GB1528418 A GB 1528418A GB 2437176 A GB2437176 A GB 2437176A GB 2437176 A GB2437176 A GB 2437176A GB 1528418 A GB1528418 A GB 1528418A
Authority
GB
United Kingdom
Prior art keywords
mma
pmma
determining
monomer
monomer content
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.)
Expired
Application number
GB2437176A
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.)
Combined Optical Industries Ltd
Original Assignee
Combined Optical Industries 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 Combined Optical Industries Ltd filed Critical Combined Optical Industries Ltd
Priority to GB2437176A priority Critical patent/GB1528418A/en
Publication of GB1528418A publication Critical patent/GB1528418A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/44—Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry

Abstract

1528418 Determining monomer in polymethylmethacrylate COMBINED OPTICAL INDUSTRIES Ltd 25 May 1977 [11 June 1976] 24371/76 Heading G1A Monomer (MMA) in an article of polymethylmethacrylate (PMMA) is determined by irradiating the article with mono chromatic light of a wavelength which gives rise to, in the Raman spectrum, a pair of lines, one corresponding to MMA alone and one corresponding to MMA + PMMA, determining the intensity of this pair of lines and determining the monomer content from the ratio thereof. Preferably the source is a laser tuned to one of 647À1, 514À5 or 488À0nm and the lines detected are 1640Œ10cm<SP>-1</SP> (MMA) and 1730Œ10cm<SP>-1</SP> (MMA + PMMA). The articles measured may be lens implants and the measuring circuitry may determine the monomer content and indicate either that or whether the MMA content is below a predetermined value.
GB2437176A 1976-06-11 1976-06-11 Determining monomer content in pmma elements Expired GB1528418A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2437176A GB1528418A (en) 1976-06-11 1976-06-11 Determining monomer content in pmma elements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2437176A GB1528418A (en) 1976-06-11 1976-06-11 Determining monomer content in pmma elements

Publications (1)

Publication Number Publication Date
GB1528418A true GB1528418A (en) 1978-10-11

Family

ID=10210673

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2437176A Expired GB1528418A (en) 1976-06-11 1976-06-11 Determining monomer content in pmma elements

Country Status (1)

Country Link
GB (1) GB1528418A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140555A (en) * 1983-05-24 1984-11-28 British Petroleum Co Plc Diamond separation
US4693377A (en) * 1983-05-24 1987-09-15 The British Petroleum Company P.L.C. Diamond separation using raman scattering
US5139334A (en) * 1990-09-17 1992-08-18 Boston Advanced Technologies, Inc. Hydrocarbon analysis based on low resolution raman spectral analysis
US5206699A (en) * 1988-05-06 1993-04-27 Gersan Establishment Sensing a narrow frequency band of radiation and gemstones
DE19735205A1 (en) * 1997-08-14 1999-02-25 Gustav Prof Dr Techn Schweiger Spectroscopic determination of soot in the environment
US6100097A (en) * 1998-04-13 2000-08-08 Opi Products, Inc. Method and apparatus for detecting methacrylate in a liquid monomer
EP1445267A1 (en) * 2003-02-06 2004-08-11 Bayer Aktiengesellschaft Process for an improved preparation of a graft copolymer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140555A (en) * 1983-05-24 1984-11-28 British Petroleum Co Plc Diamond separation
US4693377A (en) * 1983-05-24 1987-09-15 The British Petroleum Company P.L.C. Diamond separation using raman scattering
US5206699A (en) * 1988-05-06 1993-04-27 Gersan Establishment Sensing a narrow frequency band of radiation and gemstones
US5139334A (en) * 1990-09-17 1992-08-18 Boston Advanced Technologies, Inc. Hydrocarbon analysis based on low resolution raman spectral analysis
DE19735205A1 (en) * 1997-08-14 1999-02-25 Gustav Prof Dr Techn Schweiger Spectroscopic determination of soot in the environment
US6100097A (en) * 1998-04-13 2000-08-08 Opi Products, Inc. Method and apparatus for detecting methacrylate in a liquid monomer
EP1445267A1 (en) * 2003-02-06 2004-08-11 Bayer Aktiengesellschaft Process for an improved preparation of a graft copolymer

Similar Documents

Publication Publication Date Title
DE3687438D1 (en) OPTICAL TIME FIELD REFLECTOMETRY.
DE69427673T2 (en) Device with an optical fiber laser or amplifier
DE69416293D1 (en) POLYMERIZABLE YELLOW DYES AND THEIR USE IN OPHTALMIC LENSES
PL317018A1 (en) Method of and apparatus for determining the value of first parameters&#39;s of an objects
ATE108275T1 (en) OPTICAL DEVICE.
CA2025887A1 (en) Optical gauging apparatus
NO894680L (en) PULSE MODULATION OF THE EXITATION LIGHT SOURCE IN LIQUID CURRENCY PHOTOMETERS.
GB1528418A (en) Determining monomer content in pmma elements
JPS6413417A (en) Optical sensor
ATE166723T1 (en) OPTICAL INTERFEROMETRIC CURRENT SENSORS AND CURRENT MEASURING METHODS
EP0176826A3 (en) Method and apparatus for dual-beam spectral transmission measurements
JPS55142220A (en) Device for measuring wavelength
JPS53113572A (en) Dispersion characteristic measuring device of optical fiber
DE69111080T2 (en) AMPLITUDE DETERMINATION OF BIAS MODULATION IN AN OPTICAL FIBER GYRO.
JPS6469925A (en) Optical fiber type temperature distribution measuring apparatus
KR910008376A (en) How to measure the surface quality of the lens
JPS549647A (en) Loss measuring method of optical fibers
ES2110211T3 (en) INTERFEROMETRIC MEASUREMENT DEVICE.
JPS56143947A (en) Measuring device of transmittance for smoke
JPS6412236A (en) Wavelength variation monitor for semiconductor laser
JPS57196137A (en) Measuring device for photo luminescence intensity
JPS5756777A (en) Method for measuring time difference of light propagation
JPS6449942A (en) Physical property measuring instrument for liquid
JPS5619069A (en) Developer concentration detector
JPS57132040A (en) Method for optical measurement of sludge concentration

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee