Optical attenuator and optical power meter calibration systems with optical-pulse conversion and averaging

The invention is designed to calibrate a low-level optical power by a substitution method using a pulse generating section (4) in which a light-shielding disk (4a) having a sectorial opening (4c), as a component capable of accurate optical attenuation, is rotated in a light beam to generate an inter...

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Hauptverfasser:	OHUCHI, YUJI, IMAMURA, TAKAYUKI
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	COLORIMETRY INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT MEASURING PHYSICS RADIATION PYROMETRY TESTING TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
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creator	OHUCHI, YUJI IMAMURA, TAKAYUKI
description	The invention is designed to calibrate a low-level optical power by a substitution method using a pulse generating section (4) in which a light-shielding disk (4a) having a sectorial opening (4c), 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 (4c), and the pulse signal is averaged to obtain an optical attenuation equal to the duty ratio. More specifically, while an object (2) to be calibrated is set in a given standard state, a first pulse train having a duty ratio d1 = Tw1/Tf1 is input to the object (2), and an average optical power value A of an output from the object (2) is measured and stored. Subsequently, a second pulse train having a duty ratio d2 = Tw2/Tf2 is input to the object (2), and the object (2) is adjusted such that an average optical power value of an output from the object (2) 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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More specifically, while an object (2) to be calibrated is set in a given standard state, a first pulse train having a duty ratio d1 = Tw1/Tf1 is input to the object (2), and an average optical power value A of an output from the object (2) is measured and stored. Subsequently, a second pulse train having a duty ratio d2 = Tw2/Tf2 is input to the object (2), and the object (2) is adjusted such that an average optical power value of an output from the object (2) becomes the value A. 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More specifically, while an object (2) to be calibrated is set in a given standard state, a first pulse train having a duty ratio d1 = Tw1/Tf1 is input to the object (2), and an average optical power value A of an output from the object (2) is measured and stored. Subsequently, a second pulse train having a duty ratio d2 = Tw2/Tf2 is input to the object (2), and the object (2) is adjusted such that an average optical power value of an output from the object (2) becomes the value A. Proper calibration can be performed by assigning the optical attenuation of the adjusted object to d1/d2.</abstract><oa>free_for_read</oa></addata></record>
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language	eng ; fre ; ger
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subjects	COLORIMETRY INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT MEASURING PHYSICS RADIATION PYROMETRY TESTING TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
title	Optical attenuator and optical power meter calibration systems with optical-pulse conversion and averaging
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