Optics: measuring and testing – For light transmission or absorption – By comparison
Patent
1996-06-06
1998-11-03
McGraw, Vincent P.
Optics: measuring and testing
For light transmission or absorption
By comparison
356325, 356437, G01J 308
Patent
active
058317422
ABSTRACT:
A method and apparatus for instantaneously measuring the level of carbon dioxide (and other gases) in automotive combustion exhaust analysis is provided in the form of a portable battery driven roadside diagnostic instrument in which the CO.sub.2 level is measured by a calorimetric technique utilizing light as the energy source and a piezoelectric bimorph to vibrate a single fiber-optic element to multiplex between two fiber-optic receptors delivering the light to a measurement cell and a reference cell. The measurement cell comprises a salt of an acid-base indicator dye which provides proportional color change on contact with CO.sub.2. The dye is supported on a polymetric film in the cell.
REFERENCES:
patent: 3667293 (1972-06-01), Moore
patent: 3730627 (1973-05-01), Kent
patent: 4023905 (1977-05-01), Chance
patent: 4212513 (1980-07-01), Gravel
patent: 4303302 (1981-12-01), Ramsey et al.
patent: 4467236 (1984-08-01), Kolm et al.
patent: 4661320 (1987-04-01), Ito et al.
patent: 4718765 (1988-01-01), Fortunato et al.
patent: 4820045 (1989-04-01), Boisde et al.
patent: 4893934 (1990-01-01), Hansen
patent: 4914719 (1990-04-01), Conlon et al.
patent: 4928687 (1990-05-01), Lampotang et al.
patent: 4994117 (1991-02-01), Fehder
patent: 5060505 (1991-10-01), Tury et al.
patent: 5071526 (1991-12-01), Pletcher et al.
patent: 5114859 (1992-05-01), Kagenow
patent: 5131746 (1992-07-01), O'Rourke et al.
patent: 5184017 (1993-02-01), Tury et al.
patent: 5206701 (1993-04-01), Taylor et al.
patent: 5216315 (1993-06-01), Terada et al.
patent: 5223715 (1993-06-01), Taylor
patent: 5252828 (1993-10-01), Kert et al.
patent: 5343043 (1994-08-01), Johnson
patent: 5375592 (1994-12-01), Kirk et al.
patent: 5472668 (1995-12-01), Mills et al.
J.D. Ingle & S.R. Crouch, "Spectrochemical Analysis," pp. 44-47, (Prentice-Hall Int.Ed., 1988), Chap. 3, sections 3 and 4; pp. 47-60, Chap. 4, section 6; pp. 128-132, Chap. 4, section 6.
C.N. Banwell, "Fundamentals of Molecular Spectroscopy," Ed. 3 (McGraw-Hill, 1983), Chap. 3, section 8, pp. 111-123.
J. Jackson, "Infra-red Gas Analyzers Using Solid State Devices", Proc 1st Eur. Electro-optics Markets and Technology Conf. (IPC Sc. & Tech. Press, 1972, pp. 17-22.).
J.D. Ingle & S.R. Crouch, "Spectrochemical Analysis", (Prentice-Hall Int. Ed., 1988), Chap. 3, sections 3 & 4, chap. 4, section 6.
C.N. Branwell, "Fundamentals of Molecular Spectroscopy", Ed. 4 (McGraw-Hill, 1983), Chap. 3 section 8.
H.N. McMurray, "Novel thin optical film sensors for the detection of carbon dioxide", J Mat. Chem., 2(4), 401-406, 1992.
A. Mills, Quing Chang & H. N. Murray, "Equilibrium studies on colorimetric plastic film sensors for carbon dioxide", Anal. Chem. 64, 1383-1389, 1992.
J. Watson, R. Tamadoni-Jahromi, N. McMurray & G.S.V. Coles, "A Gas Monitoring Instrument Comprising Fibre Optic, Piezo-electric and Gas-Sensitive Polymer Devices", Transducers '95, Stockholm, Jun. 1995.
Jones Barbara L.
Peter Kenneth W.
Tamadoni Reza
Watson Joseph
Wylie Thomas F.
McGraw Vincent P.
Sun Electric U.K. Limited
LandOfFree
Portable electrometric apparatus for roadside analysis of automo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Portable electrometric apparatus for roadside analysis of automo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Portable electrometric apparatus for roadside analysis of automo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-695982