Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-10-03
1988-10-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250227, 250231P, 356352, G01J 350
Patent
active
047789875
ABSTRACT:
Physical changes induced in the spectral modulation sensor's optically resonant structure by the physical parameter being measured cause microshifts of its reflectivity and transmission curves, and of the selected operating segment(s) thereof being used, as a function of the physical parameter being measured. The operating segments have a maximum length and a maximum microshift of less than about one resonance cycle in length for unambiguous output from the sensor. The input measuring light wavelength(s) are selected to fall within the operating segment(s) over the range of values of interest for the physical parameter being measured. The output light from the sensor's optically resonant structure is spectrally modulated by the optically resonant structure as a function of the physical parameter being measured. The spectrally modulated output light is then converted into analog electrical measuring output signals by detection means. In one form, a single optical fiber carries both input light to and output light from the optically resonant structure. When more than one input measuring light wavelength is used, means may also be provided to divide the input light wavelengths into two portions and then take the ratio thereof. This provides several advantages simultaneously, such as enabling longer operating segments and microshifts to be used for greater sensitivity or detection range, and also eliminates certain errors caused by fluctuations in input light intensity or by changes in light intensity caused by optical fiber bending and optical fiber connectors.
REFERENCES:
patent: 3267932 (1966-08-01), Valliere
patent: 3580082 (1971-05-01), Strack
patent: 4158310 (1979-06-01), Ho
patent: 4160600 (1979-07-01), Luke
patent: 4163382 (1979-08-01), Amer
patent: 4194877 (1980-03-01), Peterson
patent: 4200110 (1980-04-01), Peterson et al.
patent: 4201222 (1980-05-01), Haase
patent: 4210029 (1980-07-01), Porter
patent: 4249076 (1981-02-01), Bergstrom et al.
patent: 4270050 (1981-06-01), Brogardh
patent: 4275296 (1981-06-01), Adolfsson
patent: 4278349 (1981-07-01), Sander
patent: 4281245 (1981-07-01), Brogardh
patent: 4307607 (1981-12-01), Saaski et al.
patent: 4321831 (1982-03-01), Tomlinson et al.
patent: 4329058 (1982-05-01), James et al.
patent: 4356396 (1982-10-01), Ruell et al.
patent: 4368645 (1983-01-01), Glenn et al.
patent: 4428239 (1984-01-01), Johnston
patent: 4430565 (1984-02-01), Brogardh et al.
patent: 4437761 (1984-03-01), Kroger et al.
patent: 4446366 (1984-05-01), Brogardh et al.
patent: 4451730 (1984-05-01), Brogardh et al.
patent: 4487206 (1984-12-01), Aagard
patent: 4558217 (1985-12-01), Alves
patent: 4581530 (1986-04-01), Brogardh et al.
patent: 4678904 (1987-07-01), Saaski et al.
patent: 4689483 (1987-08-01), Weinberger
"Fiber Optic Blood Pressure Catheter with Frequency Response from D.C. Into the Audio Range", by F. J. Clark et al, Proceedings of the National Electronics Conference, 1965, pp. 213-216.
"Medical Applications of Fiber Optics", by M. L. Polanyi, Digest of the 6th International Conference on Medical Electronics and Biological Engineering, 1965, Tokyo, pp. 598-599.
"Measurement of the Second Derivative of Left Ventricular Pressure Using a Fiber Optic Catheter", by B. Letac et al, Proceedings of the Society of Experimental Bio-Medics, 1968, pp. 63-66.
"A Fiberoptic Catheter for the Measurement of Intravascular Pressures and Sounds", by A. Ramirez et al, Abstracts of the 41st Scientific Sessions, 1968, p. VI-160.
"Direct Conversion of Sound Waves to Light Waves Using Interferometric Techniques", by L. S. Sheiner et al, IBM Technical Disclosure Bulletin, vol. 22, No. 1, June 1979.
"Fiber-Optic Probe for in Vivo Measurement of Oxygen Partial Pressure" by John I. Peterson et al, Analytical Chemistry, vol. 56, Jan. 1984, pp. 62-66.
"Fiber Optic pH Probe for Physiological Use" by John I. Peterson et al, Analytical Chemistry, May 1980, pp. 864-869.
"Fiber Optic Sensors for Biomedical Applications" by John I. Peterson et al, Science, vol. 224, No. 4645, Apr. 1984, pp. 123-12.
Fundamanetals of Optics, by Francis A. Jenkins, McGraw-Hill Book Co., 1976, pp. 301-308.
Introduction to Modern Optics, by Grant R. Fowles, Holt, Rinehart & Winston, Inc., 1975, pp. 90-97.
Optics, by Eugene Hecht, Addison-Wesley Publishing Company, 1979, pp. 307-311.
First International Converence on Optical Fibre Sensors, 26th-28th Apr. 1983, London, GB, pp. 122-125; E. R. Cox et al; "Fibre Optic Colour Sensors Based on Fabry-Perot Interferometry"; pp. 122, 124; FIG. 2.
First International Conference on Optical Fibre Sensors, 26th-28th, Apr. 1983, London, GB, pp. 6-9; W. H. Quick et al; "Fiber Optics Sensing Techniques"; p. 6, FIGS. 1, 2.
EP-A-O 013 974 (Rockwell Int. Corp.), pp. 3,6,7,10,13; FIGS. 3, 4 published Aug. 6, 1980.
WO-A-8 302 327 (MTA Kozponti Fizikai Dutato Intezete), pp. 5, 6, 9 published Jul. 7, 1983.
EP-A-O 058 801 (Imperial Chemical Ind.), published Sep. 1, 1982.
Hartl James C.
Saaski Elric W.
Moravan Gregory W.
Nelms David C.
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