The results of studying the peculiarities of use of a fiber-optic Mach-Zehnder interferometer for creating deformometers with extended gage length intended for monitoring the state of large-scale objects are presented. It is shown that the use of a multicoil sensing element provides the possibility of varying its sensitivity and contributes to reduction in the fading of the deformometer’s output signal.

Principles of the design and operation of a fiber-optic geophone based on a Mach–Zehnder interferometer for seismic monitoring of the Arctic Shelf when there is an ice cover are considered. The...

Theoretical and experimental methods of correlation processing of the speckle signals formed by a single-fiber multimode interferometer are investigated and demonstrated. These methods are based on (1) a photographic filter, (2) a standard computer, and (3) analog computing approaches. All of these methods enable the transformation modulation of the speckle pattern to be either optical or electrical signals, which linearly depend on correlation coefficients of reference and current speckle patterns. The functional dependence of the correlation coefficient on the value of the length of the interferometer is studied, enabling quantitative measurements of the length. Standard optical and electrical components are utilized, making the methods suitable for industrial use. © 1997 Society of Photo-Optical Instrumentation Engineers.

The possibility of detection of weak seismic waves in land–sea interface by horizontal fiber-optic interferometric accelerometer is experimentally demonstrated. The use of a passive phase demodulation method with a 3 × 3 fiber-optic splitter ensures high stability of the accelerometer.

The peculiarities of the crystal formation from supersaturated aqueous solutions of CuSO₄ on polymer substrates were studied using X-ray diffractometry. During the crystal formation, the test solutions were irradiated with one or two counter-propagating ultrasonic beams. Test solutions were prepared using natural deionized water with a deuterium content of 157 ± 1 ppm. The other liquid used was deuterium-depleted water with a deuterium content of 3 ppm. It was shown that irradiation with one/two ultrasonic beams resulted in drastic changes in the structure of the crystal deposit formed on the polymer substrate in the case when natural deionized water was chosen for preparing the supersaturated solution of CuSO₄.