CN204535854U - Multidetector controls a point amplitude polarization measurement system - Google Patents

Abstract

The utility model relates to a kind of multidetector and controls a point amplitude polarization measurement system, mainly comprise the light source (1), collimation lens (2), the first photodetector (3), the second photodetector (4), the 3rd photodetector (5) and the 4th photodetector (6) that set gradually according to light path, in addition, polarization measurement system also comprises computing machine (7).Compared with conventional polarization photosystem or polarimeter, the multidetector that the utility model provides controls a point amplitude polarization measurement system does not have movable part and modulating part, good mechanical stability, can complete the transient measurement treating light-metering, measuring speed instrument is determined, when system calibration by the response speed of detector, do not need to measure the Muller matrix of each optics, but whole system being considered as an entirety, a demand goes out the instrument matrix of entire system, reduces the progression of error.

Description

Multidetector controls a point amplitude polarization measurement system

Technical field

The utility model relates to a kind of system detected polarized light, particularly relates to a kind of multidetector and controls a point amplitude polarization measurement system, belong to Polarization Detection field.

Background technology

In remote optical sensing field, Polarization Detection is supplementary as of intensity detection, quantity of information can be extended to 7 degree of freedom from three-dimensional, contributes to the accuracy improving target detection and Objects recognition.Gasoloid Polarimeter, as a kind of polarization remote sensing instrument, has investigative range large, and spatial resolution height and measuring accuracy high, be widely used in the research in the fields such as weather monitoring, environmental monitoring and atmosphere radiation characteristic.Polarization Detection is as a useful supplement of intensity detection, quantity of information can be extended to 7 degree of freedom (light intensity, spectrum, space, degree of polarization, polarization azimuth, polarization ellipticity and sense of rotation) from three-dimensional (light intensity, spectrum and space), contribute to the accuracy improving target detection and Objects recognition.In the last few years, domestic and international researchist had carried out the design of a large amount of atural object measurement of polarization characteristic research and polarization imaging measuring system, had promoted the development of Polarization Detection technology greatly.But be at present still in for Polarization Detection aspect the jejune stage.

Utility model content

In order to overcome the deficiencies in the prior art, resolving the problem of prior art, making up the deficiency of existing existing product in the market.

The utility model provides a kind of multidetector and controls a point amplitude polarization measurement system, mainly comprise the light source, collimation lens, the first photodetector, the second photodetector, the 3rd photodetector and the 4th photodetector that set gradually according to light path, in addition, polarization measurement system also comprises computing machine, and described computing machine is connected with the first photodetector, the second photodetector, the 3rd photodetector and the 4th photodetector respectively.

Preferably, above-mentioned first photodetector, the second photodetector and the 3rd photodetector are placed relative to Ray obliquity, and described 4th photodetector is placed in vertical relative to light.

Preferably, above-mentioned light source is monochromatic source.

Preferably, the surface of above-mentioned first photodetector, the second photodetector and the 3rd photodetector is provided with mirror surface.

Preferably, above-mentioned polarization measurement system is also provided with driver, and described computing machine is connected with collimation lens by driver.

Compared with conventional polarization photosystem or polarimeter, the multidetector that the utility model provides controls a point amplitude polarization measurement system does not have movable part and modulating part, good mechanical stability, can complete the transient measurement treating light-metering, measuring speed is only determined, when system calibration by the response speed of detector, do not need to measure the Muller matrix of each optics, but whole system is looked as a whole, a demand goes out the instrument matrix of entire system, reduces the progression of error.

Accompanying drawing explanation

Fig. 1 is the utility model structural representation.

Reference numeral: 1-light source; 2-collimation lens; 3-first photodetector; 4-second photodetector; 5-the 3rd photodetector; 6-the 4th photodetector; 7-computing machine; 8-driver.

Embodiment

Understand for the ease of those of ordinary skill in the art and implement the utility model, below in conjunction with the drawings and the specific embodiments, the utility model being described in further detail.

The multidetector that the utility model provides controls a point amplitude polarization measurement system, mainly comprise the light source 1, collimation lens 2, first photodetector 3, second photodetector 4, the 3rd photodetector 5 and the 4th photodetector 6 that set gradually according to light path, in addition, polarization measurement system also comprises computing machine 7, and computing machine 7 is connected with the first photodetector 3, second photodetector 4, the 3rd photodetector 5 and the 4th photodetector 6 respectively.First photodetector 3, second photodetector 4 and the 3rd photodetector 5 are placed relative to Ray obliquity, and the 4th photodetector 6 is placed in vertical relative to light.Light source 1 is monochromatic source.The surface of the first photodetector 3, second photodetector 4 and the 3rd photodetector 5 is provided with mirror surface.Polarization measurement system is also provided with driver 8, and computing machine 7 is connected with collimation lens 2 by driver 8.

Computing machine 7 control and drive system 8 drives collimation lens 2 to carry out moving around axle, first photodetector 3, second photodetector 4, the 3rd photodetector 5 are tilted-putted photoelectric detector faces, be used as the minute surface of partially reflecting mirror simultaneously, 4th photodetector 6 is vertically placed, the light beam to be measured that light source 1 sends becomes after directional light through collimating mirror and incides the first photodetector 3, second photodetector 4, the 3rd photodetector 5 and the 4th photodetector 6 successively, if the stokes parameter of the light beam to be measured of incidence is S=(S ₀, S ₁, S ₂, S ₃), have after reflecting through the first photodetector 3, second photodetector 4, the 3rd photodetector 5

$S_{D_0}=M_{0}S$

$S_{D_1}=M_1{R}_1\left({\mathrm{\α}}_1\right)M_{0}S$

$S_{D_2}=M_2{R}_2\left({\mathrm{\α}}_2\right)M_1{R}_1\left({\mathrm{\α}}_1\right)M_{0}S$

In formula be the Stokes matrix after i-th detector reflection, M _ibe the Muller matrix of i-th catoptron, R _i(α _i) reflection the plane of incidence rotation, visible determined by the dimensional orientation of i-th catoptron, the signal of four detectors exports and is

$i_0=K_0(S-S_{D_0})$

$i_1=K_1(S_{D_0}-S_{D_1})$

$i_2=K_2(S_{D_1}-S_{D_2})$

$i_3=K_3{S}_{D_3}$

Proportionality constant K _id _ieigenwert, it includes the amplification factor of detection system thereafter, and from above formula, the output signal of each detector is the linear combination of light beam to be measured four stokes parameters, can be write as

$\left[\begin{array}{c}{i}_0\\ i_1\\ i_2\\ i_3\end{array}\right]=\left[\begin{array}{cccc}{a}_{00}& a_{01}& a_{02}& a_{03}\\ a_{10}& a_{11}& a_{12}& a_{13}\\ a_{20}& a_{21}& a_{22}& a_{23}\\ a_{30}& a_{31}& a_{32}& a_{33}\end{array}\right]\left[\begin{array}{c}{S}_0\\ S_1\\ S_2\\ S_3\end{array}\right]$

A can be determined by the performance of four detectors and installation position.During systematic survey, as long as ensure that light beam remains in Different Plane when every secondary reflection, then A is strange with regard to right and wrong, just can be calculated the Stokes vector of light beam to be measured by detector output intensity and matrix A.Compared with conventional polarization photosystem or polarimeter, the utility model has the following advantages:

1) movable part and modulating part is not had in detection system, good mechanical stability.

2) can complete the transient measurement treating light-metering, measuring speed is only determined by the response speed of detector.

3) when system calibration, do not need to measure the Muller matrix of each optics, but whole system looked as a whole, a demand goes out the instrument matrix of entire system, reduces the progression of error.

The embodiment of the above is better embodiment of the present utility model; not limit concrete practical range of the present utility model with this; scope of the present utility model comprises and is not limited to this embodiment, and the equivalence change that all shapes according to the utility model, structure are done is all in protection domain of the present utility model.

Claims (5)

1. a multidetector controls a point amplitude polarization measurement system, it is characterized in that: described polarization measurement system mainly comprises the light source (1) set gradually according to light path, collimation lens (2), first photodetector (3), second photodetector (4), 3rd photodetector (5) and the 4th photodetector (6), in addition, polarization measurement system also comprises computing machine (7), described computing machine (7) respectively with the first photodetector (3), second photodetector (4), 3rd photodetector (5) is connected with the 4th photodetector (6).

2. multidetector according to claim 1 controls a point amplitude polarization measurement system, it is characterized in that: described first photodetector (3), the second photodetector (4) and the 3rd photodetector (5) are placed relative to Ray obliquity, described 4th photodetector (6) is placed in vertical relative to light.

3. multidetector according to claim 1 controls a point amplitude polarization measurement system, it is characterized in that: described light source (1) is monochromatic source.

4. control a point amplitude polarization measurement system according to the multidetector one of claim 1-3 Suo Shu, it is characterized in that: the surface of described first photodetector (3), the second photodetector (4) and the 3rd photodetector (5) is provided with mirror surface.

5. control a point amplitude polarization measurement system according to the multidetector one of claim 1-3 Suo Shu, it is characterized in that: described polarization measurement system is also provided with driver (8), described computing machine (7) is connected with collimation lens (2) by driver (8).