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Page 384 of 977 Results 3831 - 3840 of 9762

Dejin Yin, Ming Xia, Fangsheng Lin, Tiecheng Li, Junan Ye
DEVELOP UV RADIATION SOURCE FOR CALIBRATION BASED ON THE INTEGRATING SPHERE

A UV radiation source based on the integrating sphere has been developed by means of theoretical calculation and computer simulation. The radiation source can meet the requirements of intensity and uniformity in the calibration of ultraviolet irradiance meters. By monitoring the intensity changes of the radiation source itself during the measurement, its stability can be recorded and corrected, thereby reducing the measurement error introduced by UV radiation source itself.

Kamol Wasapinyokul, Santhad Chuwongin, Soontorn Chanyawadee, Rojana Leecharoen, Ajchara Charoensook
EFFECTS OF BAFFLE IN AN INTEGRATING SPHERE ON THE TOTAL LUMINOUS FLUX MEASUREMENT OF A LINEAR SHAPE LAMP

The measured total luminous flux of a linear-shape lamp by using an integrating sphere can be deviated from accurate by the presence of a baffle in the sphere. For the lamp with co-axial alignment, the measured flux decreased when the baffle was longer. But with perpendicular alignment, the trend was opposite. When the baffle was further away from the detector, the measured flux decreased. These were due to the interplay of the non-uniform regions the baffle induced in the sphere.

Christian Hill, Alexander Triebeneck, Robert Schmitt
SEMI-AUTOMATED MEASUREMENT OF INJECTION NOZZLES USING FIBER-OPTICAL LOW-COHERENCE INTERFEROMETRY

The roundness measurement of boreholes with diameters less than 500 microns is a challenge that cannot be addressed with conventional metrology such as tactile measurement. This paper presents a setup for semi-automated positioning and roundness measurement of boreholes with diameters down to 160 microns using fiber-optical probes and low-coherence interferometry. The results contribute to sophisticated nozzle design and testing of final parts such as common-rail diesel injection nozzles.

Maik Rosenberger, Eduard Muslimov, Railya Akhmetgaleeva
DEVELOPMENT OF A COMPACT SPECTROMETER FOR FLUORESCENCE ANALYSIS

In the present paper an optical scheme of compact two-element spectrometer for detection of fluorescence spectra is presented. It consists of a concave holographic grating and a spherical projection mirror. The working spectral range is 500-1000 nm and the spectral resolution reaches 0.91 nm. The scheme is extremely compact and has F/# equal to 2.4.The design procedure is described in details with special emphasis on stray light suppression. The developed scheme can be used in a small-sized affordable diagnostic device, which is of a special interest for cancer diagnostics.

Pavel Neyezhmakov, Nikolai Kravchenko
PHOTORECEIVERS FOR PRECISION LASER MEASUREMENT SYSTEMS OF LENGTH

The developed photoreceiver modules (PRM) for two-frequency laser radiation at wavelengths in the range of 0.6328 to 0.4416 µm are presented. The discussed PRMs were created as per the results of theoretical calculations and experimental studies of the structure oscillations of cavity resonator depending on geometry of the concentrators.

Marja Mettänen, Joonas Melin, Heimo Ihalainen
PHOTOMETRIC STEREO SYSTEM FOR DETAILED ANALYSIS OF MATERIAL SURFACES

This paper describes a photometric stereo system for the measurement of surface topography. The system provides versatile experimental possibilities due to movable multicolor LEDs, movable camera, and a traveling (xy-) table for the sample. We introduce our measurement setup and present analysis of its performance. Our topography maps correlate well with the contact profilometry reference map, and reveal different details of the surfaces depending on the illumination wavelength and pixel size.

Li Tiecheng, Shi Leibing, Xia Ming, Yin Dejin, Lin Fangsheng, Huang Biyong
SPECTRAL RESPONSE MEASUREMENT FOR LARGE AREA SOLAR CELLS BASED ON FILTER METHOD

An apparatus for determining the spectral response of large area solar cells based on filter method has been introduced. Both of filter method and monochromator method have been used to measure the spectral response of different kinds of solar cells. The measurement result of monochromator method only represents the spectral characteristics of a certain part, while the measurement result of filter method is more suitable to describe the spectral response of the whole cell.

A. Glazov, V. Grigoriev, V. Kravtsov, A. Svetlichny, S. Tikhomirov
STANDARDS INTERCOMPARISONS IN THE FIELD OF FIBRE OPTICS WITH VNIIOFI PARTICIPATION

Activity of VNIIOFI (Russian National Metrological Institute for optical measurements) on standards comparisons in the field of fibre optics is considered. The basic results of intercomparisons in this field which have been made in the frame of some international projects are described.

V. Ye. Kravtsov, V. N. Krutikov, S. V. Tikhomirov
MEASUREMENTS UNITY PROVIDING FOR FIBRE-OPTICAL TRANSMISSION SYSTEMS

The results of design of state primary and working standards for fibre-optical systems parameters - average power, attenuation, fibre length, wavelength, chromatic and polarization mode dispersion, and also calibration chains for units transferring are described. Principles, contents and parameters of approved standards and calibration chains for units transferring traceability are considered.

Seung Kwan Kim, Kee Suk Hong, Ki-Lyong Jeong, Yong Seok Kim
CALIBRATION OF FIBER OPTIC POWER METER AT 1625 nm

Fiber optic power responsivity scale at 1625 nm is newly established to support optical fiber communication industry. Using the absolute scale at reference level of -10 dBm and the linearity measurements, a fiber optic power meter is calibrated at 1625 nm from -60 dBm to 0 dBm. The uncertainty is less than 0.7 % (k = 2) at -10 dBm and about 1 % in the full range.

Page 384 of 977 Results 3831 - 3840 of 9762