Optics: measuring and testing – By polarized light examination – With birefringent element
Patent
1987-04-22
1988-11-29
Willis, Davis L.
Optics: measuring and testing
By polarized light examination
With birefringent element
G01B 902
Patent
active
047877464
ABSTRACT:
Chromatograph in high performance liquid phase comprising a monochromatic light source emitting a beam which, after splitting, is divided into two parallel beams which go respectively through two cuvettes, the one containing a reference liquid, the other the measurement liquid. The two beams on coming from the cuvettes go into a detection unit. After splitting, each of beams R, M is divided into a system P with a semireflecting surface SR, a part going into one of the cuvettes CR, CM and being reflected by the rear of the cuvette forming a mirror MC to come back to semireflecting surface SR along a reverse path, the other part of the beam coming to be reflected on a mirror MR, at right angles to each beam, moved by a piezoelectric device PZ. The two parts of each beam coming from cuvettes CR, CM and coming from mirror MR moved by a piezoelectric device are joined in semireflecting system P, SR to reach a photodiode DM, DR sending the emitted signals to a phasemeter measuring the phase shift and the number of cycles k of phase shift between beams. The signals emitted by photodiode SM of the measurement beam are sent to a generator G exciting the piezoelectric system PZ, source S being a laser source.
REFERENCES:
patent: 3680963 (1972-08-01), Edwards et al.
Boensch, "Photoelectric Determination of Fringe Fraction in the Koesters erferometer", Feinwenk Technik & Messtechnik, vol. 84, No. 7, pp. 350-353, 11/76.
Bergquist et al. "Static and Dynamic Transducer Calibrations Using Optical Interferometric Technique", Conference on the Evaluation and Calibration of Ultrasonic Transducers, London, England, May 1977, pp. 116-122, IPC Business Press.
Compagnie Europeenne D'Instrumentation Cedi, Societe Anonyme Fra
Koren Matthew W.
Willis Davis L.
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