SU640137A1 - Automatic meter of optical range radiation polarization parameters - Google Patents

Description

measuring channels of Stokes parameters 3-6, modulator control unit 7, the first output of which is mechanically connected to the optomechanical modulator and the second output is connected to the input of the reference voltage unit 8, the output of which is connected to the inputs of synchronous detectors of measurement channels Stokes Parameters 3-6.

In turn, the modulator 1 consists of a phase plate 9 having a phase shift b, a phase plate 10 having a phase shift of polarizers // and 12, installed on the same optical axis. Kaial 3 measuring the first Stokes Si parameter consists of a filter 13, the input of which is connected to the output of the photodetector 2, and the output to the input of the synchronous detector 14, the second input of which is connected with the output of the block of reference voltages 8, and the output with the measuring device 15.

The radiation under study is fed through the modulator / to the input of the photodetector 2. At the same time, using a modulator unit 7, the phase plate 9 rotates with the angular velocity of the phase plastic 10, with the angular velocity Qj, and the polarizer // with the angular velocity Q2, with 2,, 2.,. Polarizer 12 is fixed. As a result, a complex-shaped signal is formed at the output of the photo-receiver 2.

The 3 dimension of the first parameter of Stokes 5) works as follows.

The sigal from the output of the photodetector 2 is fed to the input of the filter 13, where the signal at the doubled frequency of rotation of the polarizer (2Q2) is extracted. From the output of the filter 13, the signal at frequency 2 Q is fed to the input of the synchronous detector 14, the reference pulses to which are fed from the output of the reference voltage unit 8. From the output of the synchronous detector, the signal is fed to the input of the measuring device 15, which measures the amplitude of the signal. At the scale of the channel, this amplitude will be equal to the first Stokes Si parameter.

The operation of other measuring channels is similar.

The use in the proposed automatic polarization parameter of an additional phase plate with phase shift: orthogonal components l distinguishes the proposed automatic polarization parameter meter from the prototype, since by introducing an additional phase plate into the optical-mechanical modulator, a complicated computing device. Economic feasibility of such

The decision is obvious.

F o r: m l l invention

An automatic polarization meter for the optical range radiation, containing an opto-mechanical modulator with a control unit, consisting of a first phase plate and a polarizer connected parallel to each other and connected to two mechanical outputs of the control unit, providing different speeds rotation and

a fixed polarizer, a photodetector, and channels for measuring the Stokes parameters, associated with an electrical output of the unit, including a sinhrony detector and a measuring instrument, characterized in

that, in order to simplify the meter by excluding the computing device from the measurement channel of the first Stokes parameter, a rotary half-wave phase plate connected to the third mechanical output of the control unit, providing the rotation speed not equal to the first two, is installed in the optomechanical modulator. and the meter is connected

directly to the output of the synchronous detector.

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