scholarly journals Supersensitive Detector of Hydrosphere Pressure Variations

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6998
Author(s):  
Grigory Dolgikh ◽  
Sergey Budrin ◽  
Stanislav Dolgikh ◽  
Aleksandr Plotnikov
Keyword(s):  
High Performance ◽  
Michelson Interferometer ◽  
Frequency Range ◽  
Registration System ◽  
Operating Range ◽  
Neon Laser ◽  
Helium Neon Laser ◽  
Order Of Magnitude ◽  
Helium Neon ◽  
Speed And Accuracy

This paper presents an instrument based on an equal-arm Michelson interferometer and a frequency-stabilized helium-neon laser. It is designed to record hydrosphere pressure variations in the frequency range from 0 (conventionally) to 1000 Hz, with accuracy of 0.24 mPa at sea depths of up to 50 m. The operating range of the instrument can be increased by order of magnitude by improving the registration system speed, and accuracy can be enhanced by using larger diameter membranes and/or their smaller thickness. The paper demonstrates some experimental results obtained on the supersensitive detector of hydrosphere pressure variations, confirming its high performance in the infrasonic and sonic ranges.

Étalonnage des lunettes autocollimatrices par interférométrie en lumière laser

1985 ◽  
Vol 63 (2) ◽  
pp. 220-223
Author(s):  
Gratien Bouillon ◽  
Gilles Tremblay ◽  
Jacques Moisan ◽  
Claude Delisle
Keyword(s):  
Michelson Interferometer ◽  
Calibration Method ◽  
Laboratory Equipment ◽  
Interferometric Method ◽  
Neon Laser ◽  
Helium Neon Laser ◽  
Helium Neon

Calibration of autocollimators is usually done using a sine bar. In this paper we describe an interferometric method in which only conventional metrological laboratory equipment is used, namely an helium–neon laser and a Michelson interferometer. The precision obtained is comparable for both interferometric and sine-bar methods. For comparison purposes, a very simple third calibration method has also been used. Here, a previously calibrated autocollimator serves as the reference. [Translated by the journal]

STABILITY OF SYMMETRIC BILATERAL DC DISCHARGE IN A RING HELIUM-NEON LASER

2019 ◽  
Vol 69 ◽  
pp. 193-201
Author(s):  
M.V. Chirkin ◽  
◽  
S.V. Ustinov ◽  
V.Yu. Mishin ◽  
◽  
...  
Keyword(s):  
Neon Laser ◽  
Dc Discharge ◽  
Helium Neon Laser ◽  
Helium Neon

Low-Energy Helium-Neon Laser Irradiation Increases the Motility of Cultured Human Keratinocytes

1990 ◽  
Vol 94 (6) ◽  
pp. 822-826 ◽  
Author(s):  
Ann F. Haas ◽  
R. Rivkah Isseroff ◽  
Ronald G. Wheeland ◽  
Pamela A. Rood ◽  
Phillip J. Graves
Keyword(s):  
Laser Irradiation ◽  
Human Keratinocytes ◽  
Low Energy ◽  
Neon Laser ◽  
Helium Neon Laser ◽  
Helium Neon

Raman spectra and lattice dynamics of the α phases of nitrogen and carbon monoxide crystals

1970 ◽  
Vol 48 (19) ◽  
pp. 2265-2271 ◽  
Author(s):  
A. Anderson ◽  
T. S. Sun ◽  
M. C. A. Donkersloot
Keyword(s):  
Carbon Monoxide ◽  
Raman Spectra ◽  
Lattice Dynamics ◽  
Jones Potential ◽  
Lennard Jones ◽  
Neon Laser ◽  
Helium Neon Laser ◽  
First Time ◽  
Helium Neon ◽  
Argon Ion

The Raman spectra of polycrystalline α-nitrogen and α-carbon monoxide have been recorded at 18 °K, using argon–ion and helium–neon laser excitation. Previously undetected peaks at 60 cm−1 for N2 and 90.5 cm−1 for CO are assigned as librational modes, and splitting of the stretching mode in nitrogen is observed for the first time. Spectral features in both the intramolecular and lattice regions are assigned in accordance with accepted crystal structures, and their frequencies compared with those obtained from calculations based on a spherical Lennard–Jones potential and quadrupole–quadrupole interactions between the molecules.

Helium-neon laser irradiation induces effects on cytokine production at the protein and the mRNA level

1993 ◽  
Vol 2 (2) ◽  
pp. 75-83 ◽  
Author(s):  
Jens Oliver Funk ◽  
Andrea Kruse ◽  
Petra Neustock ◽  
Holger Kirchner
Keyword(s):  
Laser Irradiation ◽  
Cytokine Production ◽  
Mrna Level ◽  
Neon Laser ◽  
Helium Neon Laser ◽  
Helium Neon
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