Optical analytical instrument and method having improved calibration
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01N-021/31
G01N-021/85
G01J-003/51
출원번호
US-0596513
(1990-10-12)
발명자
/ 주소
Sayegh Emile (Brighton MA) Mooney Eric F. (Burlington MA)
출원인 / 주소
Tytronics, Inc. (Waltham MA 02)
인용정보
피인용 횟수 :
22인용 특허 :
0
초록▼
Optical analytical instruments to determine a physical parameter of a fluid, and methods of operation of such instruments, are shown. These employ a source of suitable optical radiation, a detector means, means defining a zone for the fluid, means defining an optical path from the radiation source t
Optical analytical instruments to determine a physical parameter of a fluid, and methods of operation of such instruments, are shown. These employ a source of suitable optical radiation, a detector means, means defining a zone for the fluid, means defining an optical path from the radiation source through the fluid zone to the detector means, and reading and control circuitry. At least two readings of optical energy that has been influenced by the fluid are taken without there having occurred substantial change to the fluid. During one of the readings a filter of known absorbance is included in the optical path so that the respective reading represents a calibration reading. A calibration-value-determining means is constructed first to compare, effectively, the two readings to remove the effect of the fluid from the value of the calibration reading, second, to compare, effectively the residual value of the calibration reading to a known value based on the known absorbance of the filter, and, third, on the basis of the second comparison, to make a calibration adjustment based on values derived while the fluid sample remained unchanged in the fluid zone. Novel software implementations of the determinations are shown. Specific examples of instruments and methods implementing these features shown are a dual lamp, no-moving part in-line spectrophotometer, a no-moving part reflection colorimeter capable of on-line or off-line operation, a scatter or fluorescence detecting implementation and a turbidimeter.
대표청구항▼
An optical analytical instrument for quantitative measurements capable of producing amplitude readings based upon the effect of a fluid upon a selected fixed wavelength in a beam of optical radiation to determine a quantitative physical parameter of the fluid, said instrument comprising a source of
An optical analytical instrument for quantitative measurements capable of producing amplitude readings based upon the effect of a fluid upon a selected fixed wavelength in a beam of optical radiation to determine a quantitative physical parameter of the fluid, said instrument comprising a source of suitable optical radiation, a detector means responsive to said selected fixed wavelength within a predetermined amplitude measurement range of the instrument, means defining a zone for said fluid, means defining an optical path from said radiation source through said fluid zone to said detector means, reading and control circuitry for taking from said detector means at least two amplitude readings of optical energy of said selected fixed wavelength that result from the influence of the fluid on said optical radiation without there having occurred substantial change to the fluid, means during one of said readings for including in said optical path a filter of known absorbance that absorbs a predetermined portion of the energy at said fixed wavelength, said portion representing a substantial fraction of said amplitude measurement range of the instrument so that the respective reading represents an amplitude calibration reading within said measurement range of the instrument, calibration-value-determining means operable while a sample of said fluid remains unchanged in said fluid zone, first to compare, effectively, said two amplitude readings at said selected fixed wavelength to remove said effect of said fluid from the value of said calibration reading, second, to compare, effectively the residual value of said calibration reading to a known value based on the known absorbance of said filter, and, third, on the basis of said second comparison, to determine an amplitude calibration value for said instrument based on amplitude values derived while said fluid sample remains unchanged in said fluid zone.
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