etc. Authors had got authors certificates and patents on many constructions of
sensors on the OEO base.
8.5.6.1 Sensor for Mechanical Micro- and Nano-Displacement
The fiber-optical sensor on the OEO of RF and microwave ranges created as the
fiber-optical interferometer gives a possibility to monitor the structural surface
variations with the accuracy of 0.1 nm. The measurement principle of relative
variations of geometrical dimensions is based on the light reflection from the
monitored surface. This accuracy achieves by utilization of four wavelengths of
the laser diode optical emission in the nanoscope, the frequency registration of the
OEO precision oscillation signal and further computer processing. The foreign
prototype operates on the principle of phase measurement of microwave subcarrier
(instead of frequency measurement in our sensor).
8.5.6.2 Sensors of Electric Voltage
The functional diagram of the OEO fiber-optical sensor is shown in Fig. 7.24 (Chap.
7). The block diagram of the high-voltage sensor (more than 25 kV) is shown in
Fig. 8.21. It contains of separate controllers C 1 –C 3 and frequency indicators with the
ring fiber-optical transfer module of information transmission from each sensor of
the high pulse voltage at each net conductor (Fig. 8.21).
Experimental characteristics of the electrical voltage sensor are presented in
Figs. 8.22 and 8.23 and show its effectiveness. Figure 8.24a shows the general
view of experimental unit of this sensor.
8.5.6.3 The Magneto-Gorge Sensor of Electric Current
Authors fulfilled investigations of the experimental sample of the magneto-gorge
sensor (Fig. 8.24b, c) of the AC electric currents with the amplitude of 100–2000 А.
At that, we use the OEO with the single fiber light guide in the indicator. The sensor
construction, which view is shown in Fig. 8.24b, c, represents a toroid with external
diameter of 10 cm made from the magneto-gorge material (ferromagnetic). The fiber
light guide with the length of 100 m had wounded in special manner to the external
side of the toroid and this fiber was pasted to the toroid case by the epoxy adhesive.
The copper wire, through which the AC electric current with amplitude 100–2000 A
flows, is placed into the internal cavity of the toroid.
The relative total longitudinal stretching-compression of the optical fiber in the
coil is approximately one hundred thousandth part (1.2 Â 10
À5 ) at wounding length
of 100 m for the amplitude of the registered AC electric current about 1.5 А.
Relative variations in the oscillation frequency of the laser oscillator are values of
the order of 1 Â 10
À5 according to calculation and experiment results. The effect on
498
8 Experimental Investigations and Practical Circuits of Optoelectronic. . .
sensors on the OEO base.
8.5.6.1 Sensor for Mechanical Micro- and Nano-Displacement
The fiber-optical sensor on the OEO of RF and microwave ranges created as the
fiber-optical interferometer gives a possibility to monitor the structural surface
variations with the accuracy of 0.1 nm. The measurement principle of relative
variations of geometrical dimensions is based on the light reflection from the
monitored surface. This accuracy achieves by utilization of four wavelengths of
the laser diode optical emission in the nanoscope, the frequency registration of the
OEO precision oscillation signal and further computer processing. The foreign
prototype operates on the principle of phase measurement of microwave subcarrier
(instead of frequency measurement in our sensor).
8.5.6.2 Sensors of Electric Voltage
The functional diagram of the OEO fiber-optical sensor is shown in Fig. 7.24 (Chap.
7). The block diagram of the high-voltage sensor (more than 25 kV) is shown in
Fig. 8.21. It contains of separate controllers C 1 –C 3 and frequency indicators with the
ring fiber-optical transfer module of information transmission from each sensor of
the high pulse voltage at each net conductor (Fig. 8.21).
Experimental characteristics of the electrical voltage sensor are presented in
Figs. 8.22 and 8.23 and show its effectiveness. Figure 8.24a shows the general
view of experimental unit of this sensor.
8.5.6.3 The Magneto-Gorge Sensor of Electric Current
Authors fulfilled investigations of the experimental sample of the magneto-gorge
sensor (Fig. 8.24b, c) of the AC electric currents with the amplitude of 100–2000 А.
At that, we use the OEO with the single fiber light guide in the indicator. The sensor
construction, which view is shown in Fig. 8.24b, c, represents a toroid with external
diameter of 10 cm made from the magneto-gorge material (ferromagnetic). The fiber
light guide with the length of 100 m had wounded in special manner to the external
side of the toroid and this fiber was pasted to the toroid case by the epoxy adhesive.
The copper wire, through which the AC electric current with amplitude 100–2000 A
flows, is placed into the internal cavity of the toroid.
The relative total longitudinal stretching-compression of the optical fiber in the
coil is approximately one hundred thousandth part (1.2 Â 10
À5 ) at wounding length
of 100 m for the amplitude of the registered AC electric current about 1.5 А.
Relative variations in the oscillation frequency of the laser oscillator are values of
the order of 1 Â 10
À5 according to calculation and experiment results. The effect on
498
8 Experimental Investigations and Practical Circuits of Optoelectronic. . .