Digital processing of optical signals in the frequency standard based in rubidium atoms - 87

2021 ◽  
Author(s):  
Kseniya G. Arinushkina ◽  
Anton P. Valov ◽  
Vadim Davydov
Keyword(s):  
Digital Processing ◽  
Frequency Standard ◽  
Optical Signals ◽  
Rubidium Atoms

scholarly journals Coherent and incoherent processes responsible for various characteristics of nonlinear magneto-optical signals in rubidium atoms

2013 ◽  
Vol 46 (18) ◽  
pp. 185003 ◽  
Author(s):  
Marcis Auzinsh ◽  
Andris Berzins ◽  
Ruvin Ferber ◽  
Florian Gahbauer ◽  
Linards Kalvans ◽  
...  
Keyword(s):  
Optical Signals ◽  
Rubidium Atoms

Prospects of high sensitivity atomic interferometer development for current gravimetry

2020 ◽  
pp. 9-12
Author(s):  
M.S. Aleynikov ◽  
V.N. Baryshev ◽  
I.Y. Blinov ◽  
D.S. Kupalov ◽  
G.V. Osipenko
Keyword(s):  
Cold Atoms ◽  
High Sensitivity ◽  
Frequency Standard ◽  
Vacuum System ◽  
Acceleration Measurement ◽  
Rubidium Atoms ◽  
Atomic Interferometer ◽  
Atomic Fountain ◽  
Absolute Measurements ◽  
Free Falling

A review of the experimental results achieved in the process of atomic fountain clocks construction at “VNIIFTRI” is presented. A possibility of the application of achieved results to the development of a sensitive interferometer (gravimeter) based on cold rubidium atoms is analyzed. The relevance of the study is in the estimation of perspective of interferometer (gravimeter) based on cold atoms for absolute measurements of local free-falling constant development. Physical fundamentals of atomic gravimeter’s operation are described. A comparison between atomic gravimeter and atomic quantum frequency standard based on cold atoms is done. Engineering solutions, that are necessary for building atomic gravimeter with required sensitivity of free-falling acceleration measurement are suggested. In order to build a gravimeter with a sensitivity reaching 1 μGal/Hz1/2 the estimations of laser phase noise, residual gas pressure in vacuum system and magnetic shielding system’s parameters are made.

Creation of the first Russian time and frequency standard on a fountain of ultracold rubidium atoms

2018 ◽  
Vol 48 (10) ◽  
pp. 967-972
Author(s):  
K Yu Pavlenko ◽  
Yu K Pavlenko ◽  
A A Belyaev ◽  
I Yu Blinov ◽  
M N Khromov ◽  
...  
Keyword(s):  
Frequency Standard ◽  
Rubidium Atoms ◽  
Time And Frequency Standard

scholarly journals The use of digital data processing to improve the metrological characteristics of the rubidium frequency standard

2021 ◽  
Vol 2086 (1) ◽  
pp. 012070
Author(s):  
A P Valov ◽  
K G Arinushkina ◽  
V V Davydov ◽  
V Yu Rud
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Experimental Studies ◽  
Digital Processing ◽  
Frequency Standard ◽  
Metrological Characteristics ◽  
Digital Data ◽  
Quantum Frequency ◽  
Quantum Frequency Standard ◽  
Digital Data Processing

Abstract The necessity of improving the metrological characteristics of a quantum frequency standard when determining the coordinates of an object on the Earth’s surface or long-term transmission of large amounts of data in satellite communication systems is substantiated. A new algorithm for digital processing of optical signals in the frequency standard is proposed. The results of experimental studies of the metrological characteristics of a quantum frequency standard based on rubidium atoms - 87 are presented

scholarly journals Features of the formation of the frequency of the microwave excitation signal in the quantum frequency standard on rubidium atoms - 87

2021 ◽  
Vol 2086 (1) ◽  
pp. 012055
Author(s):  
A S Grevtseva ◽  
R A Dmitriev ◽  
V V Davydov ◽  
V Yu Rud
Keyword(s):  
Frequency Standard ◽  
Experimental Investigations ◽  
Quantum Frequency ◽  
Term Operation ◽  
Rubidium Atoms ◽  
Quantum Frequency Standard ◽  
Optical Part ◽  
Current Design ◽  
Microwave Excitation

Abstract The article discusses the main disadvantages of the current design of a quantum frequency standard based on rubidium-87 atoms. The main disadvantages of the current design of the quantum frequency standard on rubidium-87 atoms are considered. It is noted that the processes associated with light shifts in the optical part contribute to the greatest instability in the long-term operation of the quantum frequency standard. A solution is proposed to improve the design of the rubidium standard. A forecast for improving its metrological characteristics is presented. The results of experimental investigations are presented.

A method to measure pores and fissures in geologic materials under S.E.M. by digital image processing

1978 ◽  
Vol 36 (1) ◽  
pp. 212-213
Author(s):  
L. Montoto ◽  
M. Montoto ◽  
A. Bel-Lan
Keyword(s):  
Image Processing ◽  
Optical Microscopy ◽  
Digital Image Processing ◽  
Digital Image ◽  
Digital Processing ◽  
Free Surfaces ◽  
Geologic Materials ◽  
Automatic Information ◽  
Detector Output ◽  
Rock Specimens

INTRODUCTION.- The physical properties of rock masses are greatly influenced by their internal discontinuities, like pores and fissures. So, these need to be measured as a basis for interpretation. To avoid the basic difficulties of measurement under optical microscopy and analogic image systems, the authors use S.E.M. and multiband digital image processing. In S.E.M., analog signal processing has been used to further image enhancement (1), but automatic information extraction can be achieved by simple digital processing of S.E.M. images (2). The use of multiband image would overcome difficulties such as artifacts introduced by the relative positions of sample and detector or the typicals encountered in optical microscopy.DIGITAL IMAGE PROCESSING.- The studied rock specimens were in the form of flat deformation-free surfaces observed under a Phillips SEM model 500. The SEM detector output signal was recorded in picture form in b&w negatives and digitized using a Perkin Elmer 1010 MP flat microdensitometer.

Digital Processing of STEM Images

1981 ◽  
Vol 39 ◽  
pp. 236-237
Author(s):  
A. V. Crewe ◽  
M. Ohtsuki
Keyword(s):  
High Resolution ◽  
Low Dose ◽  
Assembly Language ◽  
Processing System ◽  
Principal Component ◽  
Digital Processing ◽  
Image Analysis System ◽  
Black And White ◽  
Analysis System ◽  
Dose Imaging

We have assembled an image processing system for use with our high resolution STEM for the particular purpose of working with low dose images of biological specimens. The system is quite flexible, however, and can be used for a wide variety of images.The original images are stored on magnetic tape at the microscope using the digitized signals from the detectors. For low dose imaging, these are “first scan” exposures using an automatic montage system. One Nova minicomputer and one tape drive are dedicated to this task.The principal component of the image analysis system is a Lexidata 3400 frame store memory. This memory is arranged in a 640 x 512 x 16 bit configuration. Images are displayed simultaneously on two high resolution monitors, one color and one black and white. Interaction with the memory is obtained using a Nova 4 (32K) computer and a trackball and switch unit provided by Lexidata.The language used is BASIC and uses a variety of assembly language Calls, some provided by Lexidata, but the majority written by students (D. Kopf and N. Townes).

Routine Digital Processing of Microscope Images

1990 ◽  
Vol 48 (1) ◽  
pp. 550-551
Author(s):  
E. Wisse ◽  
A. Geerts ◽  
R.B. De Zanger
Keyword(s):  
Operating System ◽  
Digital Processing ◽  
Hard Disks ◽  
The Sun ◽  
Tape Drive ◽  
High Definition ◽  
Fluorescent Microscope ◽  
Microscope Images ◽  
Helical Scan ◽  
Ethernet Connection

The slowscan and TV signal of the Philips SEM 505 and the signal of a TV camera attached to a Leitz fluorescent microscope, were digitized by the data acquisition processor of a Masscomp 5520S computer, which is based on a 16.7 MHz 68020 CPU with 10 Mb RAM memory, a graphics processor with two frame buffers for images with 8 bit / 256 grey values, a high definition (HD) monitor (910 × 1150), two hard disks (70 and 663 Mb) and a 60 Mb tape drive. The system is equipped with Imaging Technology video digitizing boards: analog I/O, an ALU, and two memory mapped frame buffers for TV images of the IP 512 series. The Masscomp computer has an ethernet connection to other computers, such as a Vax PDP 11/785, and a Sun 368i with a 327 Mb hard disk and a SCSI interface to an Exabyte 2.3 Gb helical scan tape drive. The operating system for these computers is based on different versions of Unix, such as RTU 4.1 (including NFS) on the acquisition computer, bsd 4.3 for the Vax, and Sun OS 4.0.1 for the Sun (with NFS).

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