SU397872A1 - ELECTROOPTIC FUNCTION CONVERTER - Google Patents

Description

one

The invention relates to apparatus for analyzing and processing geophysical information, for example seismic.

An electro-optical function converter is known, which contains a sweep generator, an optical system with a light source, condensers, mirrors, optical fibers, a magnetic system with a conductive frame associated with a light-modulating louver, photodetectors, and AC amplifiers.

The well-known function converter does not allow obtaining both a sine and cosine Fourier transform. In conventional analyzing devices, the generation of Sin and Cos functions at various frequencies within the radiated range is associated with the difficulty of carrying out a phase shift by 1/2. This requires a precision phase shifter with a wide frequency bandwidth.

The proposed converter differs from the known one in that the magnetic system contains mutually perpendicular light gaps in the light guides, at the intersection of which there is a damper installed, in the initial position the overlapping luminous flux in one of the optical fibers rigidly connected to the conductive frame. It simplifies simultaneous

the formation of Sin and Cos functions in a given frequency range.

Figure 1 shows a block diagram of the proposed function converter.

The electro-optical function converter includes a sweep generator 1, an illuminator 2, condensers 3, mirrors 4, a magnetic system 5, gaps-light guides 6, a flap 7 (rigidly connected to a conductive frame), photodetectors 8, amplifiers 9 (AC) .

The device works as follows.

The luminous flux from the illuminator 2 through the condensers 3 enters the mirrors 4, separated from the latter, is concentrated by the condensers 3 in the gaps of the optical fibers 6. At the intersection of the optical fibers 6 there is a flap 7. The conductive frame is rigidly connected to this flap signal from the sweeper 1. The frame, located in a uniform magnetic field created by the magnetic system 5, rotates with the flap. In the normal position, the damper 7 blocks the luminous flux in one of the light guides 6, thereby minimizing the current at the output of the photodetector 8. As a result of the oscillations of the frame and the flap 7, the modulated and detected luminous flux enters as an electrical signal to the input of the amplifier 9 AC at the exit

first amplifier function. In another light guide 6, the shutter 7 does not normally block the luminous flux. The latter is reduced as a result of the turns of the frame and the flap, and as a result of detection in the photodetector 8 and subsequent amplification in the second amplifier 9, a function is formed. The resulting functions can be used, for example, to form a Fourier transformant.

Subject invention

Electro-optical converter functions, containing a sweep-generator, optical

a system with a light source, condensers, mirrors, optical fibers, a magnetic system with a conductive frame associated with a modulating light note by a damper, photo detectors, and AC amplifiers, characterized in that, in order to simplify the simultaneous formation of Sin and Cos functions in a given range frequency, the magnetic system contains mutually perpendicular gaps-light guides, at the intersection of which a valve is placed, in the initial position an overlapping luminous flux in one of the light guides, which is firmly connected to the current lead conductive frame.

Output

Cos