M1 Home Pubertinaje 1971 Hispanic Group Series Latino Non-Latin Americans
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Pubertinaje (1971) Pubertinaje (1971) Joaquín Cortés, Director
Pubertinaje (1971) Pubertinaje (1971) Series. Mujer Latina. Pubertinaje (1971). Pubertinaje (1971)
Pubertinaje (1971) Pubertinaje (1971) .
Pubertinaje (1971) Preface.
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Pubertinaje (1971) Pubertinaje (1971) 5 of 6.This invention relates to a spectrophotometer system, and more particularly to a single wavelength spectrophotometer system.
Spectrophotometers are well known instruments for determining the concentrations of chemical substances. Such instruments are well suited for use in the laboratory, and are also suitable for field or on-line use in industry.
In the laboratory, the most common form of a spectrophotometer is the dual beam spectrophotometer. A dual beam spectrophotometer includes two optical trains, one of which is adapted for transmitting a beam of light through a sample of fluid to be analyzed, while the other optical train transmits a reference beam of light through the fluid being analyzed. A plurality of optical detectors, usually in the form of photodetectors, are provided, and each is assigned to detect light which has passed through the sample or reference beam. The photodetectors are arranged to receive beams of light from both the sample and reference beam passes, and from the two optical trains. The outputs of the photodetectors are then supplied to signal processing circuitry, which derives a number of signals from the photodetectors, including those derived by comparison of the sample and reference beams and those derived by comparison of the sample and reference beams to a fixed light reference. These signals are then used to provide data, usually in the form of a plot be359ba680
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