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2010 year, number 4

Precise Measurements of Nanostructure Parameters

L. I. Fedina, D. V. Sheglov, A. K. Gutakovskii, S. S. Kosolobov, A. V. Latyshev
Keywords: metrology, nanodiagnostics, semiconductor nanostructures, transmission electron microscopy, scanning electron microscopy, self-organization
Pages: 5-18

Abstract >>
The precision of measurements performed by atomic-force microscopy (AFM) and highresolution electron microscopy (HREM) for solving problems of metrology and diagnostics of solid nanostructures is discussed. The HREM-measured height of a monatomic step on a Si(111) surface covered by a thin natural oxide film is demonstrated to be 0.314 ± 0.001 nm. The same accuracy is ensured by AFM measurements through controlling the Si surface relief with heating in ultra-high vacuum on specially created test objects with the distance between the steps being approximately 2 μm. It is shown that the geometric phase method can be used to quantify the strains in the crystal lattice of strained heterostructures on the basis of HREM images with accuracy to 104 %, and in situ irradiation by electrons in HREM measurements can be used to visualize ordered clusterization of vacancies and self-interstitial atoms in {113} planes in Si samples.

Nano- and Micrometrology at PTB: State of the Art and Future Challenges

H. Bosse, L. Koenders, F. Hartig, E. Buhr, G. Wilkening
Keywords: dimensional (linear and angular) metrology, micrometrology, nanometrology, signal modeling
Pages: 19-25

Abstract >>
In this paper we will provide an overview of methods and instruments developed and applied at the National Metrology Institute of Germany (Physikalisch Technische Bundesanstalt - PTB) for high-precision dimensional (linear and angular) measurements and discuss some challenges  for future developments in this important area of metrology.

Three-Dimensional Nanopositioning and Nanomeasuring Machine with a Resolution of 0.1 nm

Gerd Jager
Keywords: : NMM-1 machine, Abbe-error-free design, nanoprobes
Pages: 26-32

Abstract >>
The paper describes traceable nanometrology based on a nanopositioning machine with integrated nanoprobes. The operation of a high-precision long-range three-dimensional nanopositioning and nanomeasuring machine (NMM-1) having a resolution of 0.1 nm over the positioning and measuring range of 25 × 25 × 5 mm is explained. Various developed probe systems have been integrated into the NMM-1 machine, including a focus sensor, a white light sensor, and tactile nanoprobes. Single-beam, double-beam, and triple-beam interferometers are installed into the NMM-1 machine to measure and control the six degrees of freedom. Measured results are presented.

Medical and Biological Measurement with Micro- and Nanosensors

Peter Rolfe
Keywords: biomedical measurement, micro- and nanosensor, MEMS/NEMS, lab-on-a-chip, cell and tissue engineering, biomimetic sensors, nanooptics
Pages: 33-39

Abstract >>
This review concerns the design and use of micro- and nanosensors based on electrochemical, acoustic, piezoelectric, and optical principles for medical diagnosis and care and for biological research. The target measurands include an ever-increasing number of simple and complex molecules, physical quantities, and electrical and magnetic phenomena.

Testing Aspheric Lenses: New Approaches

Wolfgang Osten, Bernd Dorband, Eugenio Garbusi, Christof Pruss, Lars Seifert
Keywords: optical metrology, asphere testing, dynamic wavefront adaption, dynamic wavelength adaption
Pages: 40-53

Abstract >>
Optical metrology provides a unique approach to measuring surfaces, both technical and optical, over a wide measurement range from macro to nano. We present two new approaches to measuring aspheric lenses with increased flexibility. The first is based on a modified Twyman -Green interferometer where multiple sources for the illumination of the aspheric surface with different angles are adopted to achieve a local compensation of the gradient and consequently a reduction of interference fringes. The second is based on a chromatic Fizeau interferometer with a diffractive element as null-optic for the measurement of extreme ultraviolet aspheres.

Analysis of the Contact Probe Mechanism for Micro-Coordinate Measuring Machines

K.-CH. Fan, F. Cheng, W.-T. Pan, R. Li
Keywords: contact probe, floating plate, stiffness, coordinate measuring machines
Pages: 54-62

Abstract >>
High precision contact scanning probes for measuring miniature components on micro- and nano-coordinate measuring machines requires sensitive mechanisms. This paper analyzes the mechanism of a developed contact probe in order to find its optimal dimensions. The contact probe is composed of a fiber stylus with a ball tip, a mechanism with a wire-suspended floating plate, and focus sensors. The wires experience elastic deformation when a contact force is applied. The probe mechanism with a four-wire floating plate is studied. Stiffness analysis is carried out using the theory of elasticity. It is found that, with a proper stylus length, a contact probe with uniform stiffness can be designed.

Comparison of Temperature Distribution Measurement Methods with the Use of the Bragg Gratingsand Raman Scattering of Light in Optical Fibers

S. A. Babin, A. G. Kuznetsov, I. S. Shelemba
Keywords: fiber sensors, distributed systems, fiber Bragg grating, reflectometer, Raman scattering
Pages: 70-77

Abstract >>
Two types of fiber-optical measurement systems are compared: a line with a large number of point sensors based on fiber Bragg gratings (FBGs) interrogated by a tunable continuous fiber laser and a distributed system based on optical time-domain reflectometry (OTDR) of the Raman scattering of radiation of a pulsed fiber laser. Methods for increasing the measurement accuracy with the use of additional calibration of the Bragg wavelength shift over a fiber interferometer in the FBG system and spectral filtration of the Stokes and anti-Stokes components of the Raman scattering with the use of spectral-selective fiber couplers in the OTDR system are proposed and implemented. Physical effects on system parameters are analyzed, compared, and optimized for applications with monitoring of the temperature distribution in turbogenerators and oil wells.

Automatic Recording of Object Motion by the Speckle Method in the Terahertz Range

B. A. Knyazev, A. A. Nikitin, V. S. Cherkasskii
Keywords: speckles, terahertz radiation, motion of invisible objects, image processing
Pages: 78-83

Abstract >>
Using a microbolometer detector array, we recorded real-time images of metallic and dielectric objects illuminated by monochromatic terahertz radiation, including those hidden behind an opaque barrier. It is shown that the characteristics of movement of rough objects dynamic can be retrieved from the dynamics of the speckle structure of their images in the terahertz range. An automatic processing algorithm for terahertz videos with recording of moving objects was developed and software implemented.

Diffractive Elements for a Free Electron Laser

V. M. Vedernikov, P. M. Dutov, A. I. Kokarev, V. P. Kir'yanov, B. A. Knyazev, V. G. Nikitin, I. G. Pal'chikova, A. R. Sametov, M. F. Stupak, Y. V. Chugui, V. V. Chukanov
Keywords: diffractive optical elements, free electron laser, terahertz radiation, polypropylene
Pages: 84-97

Abstract >>
The limits of applicability of geometrical optical methods of calculating diffractive optical elements for terahertz radiation are determined. Use of the method of hot pressing in vacuum chambers to produce polymer transmissive diffractive elements for controlling terahertz radiation is considered. The effect of radiation absorption on the focal spot size and the radiation resistance of the elements are estimated. Experimental study of the optical characteristics of diffraction lenses fabricated in polypropylene revealed 17 percent differences from the diffraction limit.

Estimates of the Maximum Likelihood of Parameters of Weak Optical Signals during Photodetecting by Means of Recording Photoelectron Emission Moments

V. S. Sobolev, S. V. Khabarov
Keywords: optical signals, maximum likelihood estimates, Kramer-Rao bounds
Pages: 98-105

Abstract >>
A likelihood function is obtained for estimating parameters of weak optical signals during detecting by means of recording emission moments of each photoelectron. Likelihood equations are derived and solved by an example of optimal estimates of a Gaussian pulse. Expressions for compatible and incompatible estimates of all three unknown parameters of the pulse are obtained. Analytical expressions for the Kramer-Rao bounds determining the quality of the estimates obtained are also derived. The variances of compatible estimates of the signal amplitude are demonstrated to be three times those of incompatible estimates, while the variances of the estimates of all parameters are inversely proportional to the product of the signal amplitude and its duration.

Studying Thin Films Obtained Through Centrifugation of the Human Blood Serum by Methods of Spectral Ellipsometry and Infrared Spectroscopy

M. I. Voevoda, S. E. Pel'tek, M. V. Kruchinina, S. A. Kurilovich, V. N. Kruchinin, K. P. Mogil'nikov, S. V. Rykhlitskii
Keywords: : ellipsometry, IR spectroscopy, centrifugation, human blood serum
Pages: 106-120

Abstract >>
Thin films obtained by centrifugation of blood serum of healthy people and people with viscera diseases are studied by methods of spectral ellipsometry and infrared spectroscopy. Physical properties of such films are found to depend on the bio-organic composition of blood serum, which, in turn, is determined by pathological processes proceeding in the human organism. It is of interest that spectral ellipsometry and infrared spectroscopy are suitable nondestructive express methods of screening, i.e., preliminary blood diagnostics for patients with viscera pathology. Ellipsometric data on specific features of formation of bio-organic coatings from blood serum of patients with diffuse pathology of liver, hyperlipidemia, and diabetes mellitus are validated by changes in the fine structure of infrared spectra.

Multichannel High-Performance Optoelectronic Control of the Surface of Fuel Pellets

A. V. Beloborodov, E. V. Vlasov, P. S. Zav'yalov, L. V. Finogenov
Keywords: computer vision system, fuel pellet, defects, image processing
Pages: 121-129

Abstract >>
Optoelectronic methods for controlling the appearance of nuclear reactor fuel pellets are considered. In the proposed methods, reflected images of pellet surfaces are taken by digital cameras, which provides high contrast of defective areas against the frame background. Image processing algorithms for identification of defective products are given. An experimental model of a system with a capacity of up to 10 pellets per second was designed. A database containing surface images of simulators and real pellets was designed to train the system. Results of real time processing of the obtained images show that the probability of detection of defective pellets is not less than 95%.