Optical attenuator and optical power meter calibration systems w

Details Optical attenuator and optical power meter calibration systems w Optical attenuator and optical power meter calibration systems w

1990-10-25

1992-09-15

Rosenberger, Richard A.

Optics: measuring and testing

Standard

356235, 2502521, G01J 100

Patent

active

051482339

ABSTRACT:
The invention is designed to calibrate a low-level optical power by a substitution method using a pulse generating section in which a light-shielding disk having a sectorial opening, as a component capable of accurate optical attenuation, is rotated in a light beam to generate an intermittent pulse signal having a duty ratio corresponding to the size of the opening, and the pulse signal is averaged to obtain an optical attenuation equal to the duty ratio. More specifically, while an object to be calibrated is set in a given standard state, a first pulse train having a duty ratio d1=Tw.sub.1 /Tf.sub.1 is input to the object, and an average optical power value A of an output from the object is measured and stored. Subsequently, a second pulse train having a duty ratio d2=Tw.sub.2 /Tf.sub.2 is input to the object, and the object is adjusted such that an average optical power value of an output from the object becomes the value A. Proper calibration can be performed by assigning the optical attenuation of the adjusted object to d1/d2.

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C. L. Sanders, Accurate Measurements of and Corrections for Nonlinearities-in Radiometers, Sep. 1972, 437-453, Journal of Research of the National Bureau of Standards-A. Physics and Chemistry, vol. 76A, No. 5.
O. C. Jones and F. J. J. Clarke, A New Photometric Technique Using a Variable Shutter Device, Nature, vol. 191, Sep. 23, 1961, p. 1290.
H. Kunz, Representation of the Temperature Scale Above 1337.58K with Photoelectric Direct Current Pyrometers, Metrologia, vol. 5, No. 3, 1969, pp. 88-102.
H. J. Jung, Kompesation von Nichtlinearitaten bei photoelektrischen Strahlungsmessungen, Z. Angew. Physik, vol. 31, 1971, pp. 170-176.

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