23 research outputs found
Π’Π΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°Π½Π°Π»ΠΈΠ· Π΄ΠΈΡΡΠ°ΠΊΡΠΈΠΈ Π³Π°ΡΡΡΠΎΠ²Π° ΠΏΡΡΠΊΠ° Π½Π° ΡΡΡΠΏΠ΅Π½ΡΠ°ΡΠΎΠΉ ΡΠ°Π·ΠΎΠ²ΠΎΠΉ ΡΡΡΡΠΊΡΡΡΠ΅ (Π‘Π€Π‘)
The paper analyzes the interaction of a Gaussian beam with a phase step structure (PSS). The shape of the spatial spectrum at the output of such a scheme is examined. The most detailed description was done for the case when the size of the PSS phase diο¬erence is 180 degrees. The eο¬ects that occur at the displacement of SPS in the plane perpendicular to the direction of incidence of the laser beam were considered. Discussions for the possible practical application of the scheme were carried out.Π ΡΠ°Π±ΠΎΡΠ΅ ΠΏΡΠΎΠ²Π΅Π΄ΡΠ½ Π°Π½Π°Π»ΠΈΠ· Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡ Π³Π°ΡΡΡΠΎΠ²Π° ΠΏΡΡΠΊΠ° ΡΠΎ ΡΡΡΠΏΠ΅Π½ΡΠ°ΡΠΎΠΉ ΡΠ°Π·ΠΎΠ²ΠΎΠΉ ΡΡΡΡΠΊΡΡΡΠΎΠΉ (Π‘Π€Π‘). ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Π° ΡΠΎΡΠΌΠ° ΠΏΡΠΎΡΡΡΠ°Π½ΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ ΡΠΏΠ΅ΠΊΡΡΠ° Π½Π° Π²ΡΡ
ΠΎΠ΄Π΅ ΡΠ°ΠΊΠΎΠΉ ΡΡ
Π΅ΠΌΡ. ΠΠ°ΠΈΠ±ΠΎΠ»Π΅Π΅ Π΄Π΅ΡΠ°Π»ΡΠ½ΠΎ ΠΎΠΏΠΈΡΠ°Π½ ΡΠ°ΡΡΠ½ΡΠΉ ΡΠ»ΡΡΠ°ΠΉ, ΠΊΠΎΠ³Π΄Π° Π²Π΅Π»ΠΈΡΠΈΠ½Π° ΡΠ°Π·ΠΎΠ²ΠΎΠ³ΠΎ ΠΏΠ΅ΡΠ΅ΠΏΠ°Π΄Π° Π‘Π€Π‘ ΡΠΎΡΡΠ°Π²Π»ΡΠ΅Ρ 180 Π³ΡΠ°Π΄ΡΡΠΎΠ². ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ ΡΡΡΠ΅ΠΊΡΡ, ΠΊΠΎΡΠΎΡΡΠ΅ ΠΈΠΌΠ΅ΡΡ ΠΌΠ΅ΡΡΠΎ ΠΏΡΠΈ ΡΠΌΠ΅ΡΠ΅Π½ΠΈΠΈ Π‘Π€Π‘ Π² ΠΏΠ»ΠΎΡΠΊΠΎΡΡΠΈ, ΠΏΠ΅ΡΠΏΠ΅Π½Π΄ΠΈΠΊΡΠ»ΡΡΠ½ΠΎΠΉ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ΠΏΠ°Π΄Π΅Π½ΠΈΡ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ. ΠΠ±ΡΡΠΆΠ΄Π°ΡΡΡΡ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΡΠ΅ ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ ΡΡ
Π΅ΠΌΡ
ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΎΠΏΡΠΎΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠ³ΠΎ Π΄Π°ΡΡΠΈΠΊΠ° ΡΠ³Π»ΠΎΠ²ΡΡ ΡΠΌΠ΅ΡΠ΅Π½ΠΈΠΉ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Π³Π»ΡΠ±ΠΎΠΊΠΎΠΉ ΠΎΡΡΠ°ΠΆΠ°ΡΠ΅Π»ΡΠ½ΠΎΠΉ ΡΠ°Π·ΠΎΠ²ΠΎΠΉ Π΄ΠΈΡΡΠ°ΠΊΡΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠ΅ΡΡΡΠΊΠΈ
An optoelectronic device for measurements of small angular displacements based on a diffraction of a laser beam on a deep reflective phasetype grating was suggested and investigated. The grating's depth is about several wavelengths. The zero diffraction order's power dependency on the incident angle of a laser beam was investigated theoretically and experimentally. There were found conditions when linear conversion of angular vibrations into changes of power of zero order took place. The experimentally measured sensitivity of the device was rad with channel bandwidth of 800 Hz and signal-to-noise ratio 10.ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½ ΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ ΠΎΠΏΡΠΎΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΡΠΉ Π΄Π°ΡΡΠΈΠΊ ΠΌΠ°Π»ΡΡ
ΡΠ³Π»ΠΎΠ²ΡΡ
ΠΏΠ΅ΡΠ΅ΠΌΠ΅ΡΠ΅Π½ΠΈΠΉ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Π΄ΠΈΡΡΠ°ΠΊΡΠΈΠΈ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΡΠΊΠ° Π½Π° Π³Π»ΡΠ±ΠΎΠΊΠΎΠΉ ΠΎΡΡΠ°ΠΆΠ°ΡΠ΅Π»ΡΠ½ΠΎΠΉ ΡΠ°Π·ΠΎΠ²ΠΎΠΉ Π΄ΠΈΡΡΠ°ΠΊΡΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠ΅ΡΡΡΠΊΠ΅. ΠΡΠΎΠ²Π΅Π΄ΡΠ½ ΡΠ΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°Π½Π°Π»ΠΈΠ· ΠΈ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ Π΄Π°ΡΡΠΈΠΊΠ°
Linear moving meters designed on the basis of laser probing of scales of a type: Surface acoustic wave (SAW) - Diffraction grating (DG)
A comparative analysis of moving meters schemes of an acoustic-optical type is carried out. Reference scales formed by surface acoustic waves and diffraction gratings are used in these schemes. The system SAW-DG is probed by a laser beam. The measurement of movement is effected by change of the phase of a signal at SAW frequency in the optoelectronic channel. Repeatability, resolving power, exactitude, range of measurements are analyzed. The resolving power better than 0,05 microns can be reached using SAW wave-length in a range of 30 up to 100 microns
Linear moving meters designed on the basis of laser probing of scales of a type: Surface acoustic wave (SAW) - Diffraction grating (DG)
A comparative analysis of moving meters schemes of an acoustic-optical type is carried out. Reference scales formed by surface acoustic waves and diffraction gratings are used in these schemes. The system SAW-DG is probed by a laser beam. The measurement of movement is effected by change of the phase of a signal at SAW frequency in the optoelectronic channel. Repeatability, resolving power, exactitude, range of measurements are analyzed. The resolving power better than 0,05 microns can be reached using SAW wave-length in a range of 30 up to 100 microns
Experimental investigation of laser beam diffraction on phase step and its practical applications
The change in shape of the spatial spectrum, which is a result of the interaction of a focused laser beam with a phase step structure (PSS), is investigated. As a laser beam passes through a PSS, a spatial spectrum of radiation in the form of two peaks with a deep gap in between is generated. The change in the peaks' structure as the PSS moves relative to the optical axis of the laser beam is studied in detail. On the basis of the experimental results, a new scheme for measuring small linear and angular deviations is proposed. Β© The Institution of Engineering and Technology 2014
Experimental investigation of laser beam diffraction on phase step and its practical applications
The change in shape of the spatial spectrum, which is a result of the interaction of a focused laser beam with a phase step structure (PSS), is investigated. As a laser beam passes through a PSS, a spatial spectrum of radiation in the form of two peaks with a deep gap in between is generated. The change in the peaks' structure as the PSS moves relative to the optical axis of the laser beam is studied in detail. On the basis of the experimental results, a new scheme for measuring small linear and angular deviations is proposed. Β© The Institution of Engineering and Technology 2014
ΠΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ Π°ΠΊΡΡΡΠΎΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡ Π² Π²ΠΎΠ»Π½ΠΎΠ²ΠΎΠ΄Π½ΠΎΠΌ ΠΈΠ½ΡΠ΅ΡΡΠ΅ΡΠΎΠΌΠ΅ΡΡΠ΅
ΠΡΠΈΠ²ΠΎΠ΄ΡΡΡΡ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΠ΅ΡΠ΅Π΄Π°ΡΠΎΡΠ½ΡΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΈ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΡΡΠΈΡΡΠ²Π°Π½ΠΈΡ ΡΠΈΠ³Π½Π°Π»ΠΎΠ² Π² ΡΡΡΡΠΎΠΉΡΡΠ²Π°Ρ
Π½Π° ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠ½ΡΡ
Π°ΠΊΡΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π²ΠΎΠ»Π½Π°Ρ
Ρ ΠΏΠΎΠΌΠΎΡΡΡ ΠΏΠΎΠ»ΠΎΡΠΊΠΎΠ²ΠΎΠ³ΠΎ Π²ΠΎΠ»Π½ΠΎΠ²ΠΎΠ΄Π½ΠΎ-ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΠ½ΡΠ΅ΡΡΠ΅ΡΠΎΠΌΠ΅ΡΡΠ°. ΠΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΠΉ ΠΌΠ°ΠΊΠ΅Ρ Π±ΡΠ» ΠΈΠ·Π³ΠΎΡΠΎΠ²Π»Π΅Π½ Π½Π° ΠΏΠΎΠ΄Π»ΠΎΠΆΠΊΠ΅ ΠΈΠ· Π½ΠΈΠΎΠ±Π°ΡΠ° Π»ΠΈΡΠΈΡ YZ-ΡΡΠ΅Π·Π°. ΠΠ½ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π» ΠΏΠΎΠ»ΠΎΡΠΊΠΎΠ²ΡΠΉ Π²ΠΎΠ»Π½ΠΎΠ²ΠΎΠ΄Π½ΡΠΉ Π΄Π²ΡΡ
ΠΏΠ»Π΅ΡΠ΅Π²ΠΎΠΉ ΠΈΠ½ΡΠ΅ΡΡΠ΅ΡΠΎΠΌΠ΅ΡΡ Ρ ΡΠ»Π΅ΠΊΡΡΠΎΠ΄Π°ΠΌΠΈ Π΄Π»Ρ ΡΠ»Π΅ΠΊΡΡΠΎΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΊΠΎΡΡΠ΅ΠΊΡΠΈΡΠΎΠ²ΠΊΠΈ Π½Π°ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠ΄Π²ΠΈΠ³Π° ΡΠ°Π· ΠΌΠ΅ΠΆΠ΄Ρ ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ Π²ΠΎΠ»Π½Π°ΠΌΠΈ Π² ΠΏΠ»Π΅ΡΠ°Ρ
ΠΈΠ½ΡΠ΅ΡΡΠ΅ΡΠΎΠΌΠ΅ΡΡΠ° ΠΈ Π²ΠΎΠ·Π±ΡΠ΄ΠΈΡΠ΅Π»Ρ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠ½ΡΡ
Π°ΠΊΡΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π²ΠΎΠ»Π½ Π²ΡΡΡΠ΅ΡΠ½ΠΎ-ΡΡΡΡΠ΅Π²ΠΎΠ³ΠΎ ΡΠΈΠΏΠ°. ΠΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΌΠΎΠ³ΡΡ Π½Π°ΠΉΡΠΈ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΠΏΡΠΈ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ΅ ΡΡ
Π΅ΠΌ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠΈ ΡΠΈΠ³Π½Π°Π»ΠΎΠ² Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΠΠΠ ΠΈ ΠΏΡΠΈ ΠΊΠΎΠ½ΡΡΡΡΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠΎΠ΄ΡΠ»ΡΡΠΎΡΠΎΠ²
An optical setup for measuring amplitude and phase distributions of surface acoustic waves
The setup is intended for measuring amplitude and phase distributions of surface acoustic wave fields in a frequency range of 10-100 MHz. Optimal parameters of the setup and its elements are presented. The threshold detection amplitude of surface acoustic waves is 10-4 nm for a 1-kHz reception bandwidth. The phase channel instability does not exceed 0.2Β° during the measurement cycle. The relative difference between the velocities at the free and metal-coated surfaces is obtained from phase measurements with a test sample. The result is in good agreement with reference data. Β© 1998 MAHK Hayka/Interperiodica Publishing
Modulator of laser radiation
A new mechanical modulator of laser radiation is proposed. The working principle is based on the specific diffraction of coherent radiation by a deep reflection grating with rectangular profile. The modulator can be used in various wavelength ranges. Β© 2012 Pleiades Publishing, Inc