CN101339217A - Test system for measuring polarization direction - Google Patents

Abstract

The invention provides a test system used for measuring polarization direction, mainly comprising the following contents: (1) component parts of the test system and structure and function of various parts; (2) introduction of a testing method; (3) introduction of a processing method for a test result. The quasi-optical technology is adopted in the invention, which has the advantages of convenience, immediacy and high accuracy.

Description

A kind of test macro that is used for measuring polarization direction

Technical field:

The present invention adopts the quasi-optics method to be used for the measurement of polarised direction.

Background technology:

Submillimeter wave is the new wave band of opening up of electromagnetism, and people increase just day by day to the interest of this wave band.Because submillimeter wave research work starting evening, so also can not show a candle to centimeter wave at present or the millimeter wave research work is so ripe.With regard to its transmission, measuring technology, mainly still adopt method of optics, we are referred to as quasi-optical technique.

Summary of the invention:

The invention provides a kind of method of testing of polarization of ele direction, have convenient, fast, high-precision characteristics.

Test macro for the line polarization wave of a certain polarised direction, is established the electric field polarization direction from the horizontal by the θ angle shown in synoptic diagram.It can be decomposed into the line polarization wave of two quadratures, is respectively horizontal polarized wave and vertically polarized wave.Through behind the polarisation filter, horizontal polarized wave will be output port one through polarisation filter and receive.Vertically polarized wave reflects polarized wave filter, and again via behind the twist-reflector device, the change of 90 degree takes place polarised direction, becomes horizontal polarized wave and is output port 2 receptions.Like this, our data of handling two ports respectively just can obtain the polarization of electromagnetic wave direction.

In order to obtain polarised direction accurately, we will be handled and be revised the data that receive.We use E the horizontal component that output port 1 receives _||Expression, we use E the vertical component that output port 2 receives _⊥Expression, the data of reception are electromagnetic electric field value.By testing the voltage transmission coefficient that we obtain lens 4 is T ₁, the voltage transmission coefficient of twist-reflector device is T ₂Because the travel path difference of two components, damping capacity are just different, so need be compensated.Revised polarised direction is handled formula:

$\mathrm{\&theta;}=\arctan \left|\frac{E_{\&perp;}}{E_{\left|\right|}\&times;{\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="A20081011810100051.png,A20081011810100053.png"\; state="\{\{state\}\}">T</figure-callout>}}_1\&times;{\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="A20081011810100051.png"\; state="\{\{state\}\}">T</figure-callout>}}_2}\right|$

Description of drawings:

Fig. 1: test macro synoptic diagram

Fig. 2: polarisation filter sectional view

Fig. 3: polarisation filter side view

Fig. 4: twist-reflector device sectional view

Fig. 5: twist-reflector device side view

Embodiment:

The design of test macro is according to shown in Figure 1, and the effect of di-lens (2) is the direction of control electromagenetic wave radiation and converges.Method for designing is followed the method for designing of optical element.The design of polarisation filter (3) and twist-reflector device (4) then depends on frequency of operation.The receiving antenna of output port (1) need design according to the bunching characteristic and the beam waist position of lens.

It will be appreciated by those skilled in the art that: under the prerequisite that does not deviate from broad scope of the present invention, can change the foregoing description.Thereby the present invention is not limited in disclosed specific embodiment, and its scope should contain core of the present invention and the interior all changes of protection domain that appended claims limits.

Claims (2)

1, the core concept of this kind method of testing is:

(1) adopt quasi-optical technique a certain line polarization wave to be decomposed into the line polarization wave of two quadratures.

(2) test the line polarization wave of these two quadratures respectively, obtain tested polarization of electromagnetic wave direction through after the data processing.

(3) test is for convenience handled the line polarization wave of one of them quadrature, makes it polarised direction reversing of 90 degree taken place.

2, the test macro introduced of this patent is a kind of performance of this core concept.But method is not limited only to this.

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