CN102095403A - View field-variable high precision signal light incident angle detection system based on variable-focus imaging lens set and signal light incident angle detection method - Google Patents

Abstract

The invention discloses a view field-variable high precision signal light incident angle detection system based on variable-focus imaging lens set and a signal light incident angle detection method, and more particularly, relates to a view field-variable high precision signal light incident angle detection system and a detection method thereof. The system solves the problems of unchanged view field and precision in the process of aiming, capturing and tracing in traditional system, and not only meets the demand of the system on large view field in the process of aiming and capturing, but also meets the demand of the system on high detection precision in the process of tracing. The system is characterized in that: signal lights are focused onto an ocular lens by a telescope objective and then transmitted to a fine pointing mirror via the ocular lens, and the transmitted light is reflected by the fine pointing mirror to a variable-focus imaging lens set and focused by the variable-focus imaging lens set onto a detection plane of a CCD (Charge-Coupled Device) detector. The method comprises the steps that: a tracing and point system regulates the focal length of the variable-focus imaging lens set to be fl to realize the aiming and the capturing for the signal light, and regulates the focal length to be beta.fl to realize the tracing for the incident light in order to realize the detection for the incident angle of the signal light. The system and the method are suitable for the detection for the incident angle of the signal light.

Description

Change ken high-precision signal angle of light degree detection system and flashlight incident angle detection method based on the varifocal imaging lens combination

Technical field

The present invention relates to a kind of ken adjustable high precision incident angle of light detection system and detection method.

Background technology

When space optical communication system was worked, aiming required terminal incident angle of light detection system to have the characteristics of the big ken with acquisition procedure, and requires lower to the incident angle of light detection accuracy; Tracing process requires this system to incident angle of light detection accuracy height, and ken requirement is less.The present space optical communication terminal incident angle of light detection system ken is fixed, and the angle detection precision is fixed, and can not satisfy above 2 requirements simultaneously, can only carry out compromise to a certain degree.

Summary of the invention

The present invention is in order to solve the problem that the fixing and angle detection precision of the existing space optical communication terminal incident angle of light detection system ken fixedly causes taking into account in aiming, the acquisition procedure detected with high accuracy in ken detection greatly and the tracing process, thereby a kind of change ken high-precision signal angle of light degree detection system and flashlight incident angle detection method based on the varifocal imaging lens combination is provided.

Based on the change ken high-precision signal angle of light degree detection system of varifocal imaging lens combination, it comprises that telephotolens, eyepiece, essence take aim at mirror, varifocal imaging lens combination, ccd detector and Pointing Control System,

The detectable signal output terminal of ccd detector is connected with the detectable signal input end of Pointing Control System, the zoom control signal output terminal of Pointing Control System is connected with the zoom control signal input end of varifocal imaging lens combination, and the essence of Pointing Control System is taken aim at control signal output ends and taken aim at signal input end with the smart essence of taking aim at mirror and be connected;

Telephotolens focuses to eyepiece with incoming signal light, and is transmitted through essence through eyepiece and takes aim at mirror, and transmitted light is taken aim at mirror reflection to the varifocal imaging lens combination through essence, and reflected light focuses to the test surface of ccd detector through the varifocal imaging lens combination.

Based on the change ken high-precision signal angle of light degree detection method based on the varifocal imaging lens combination of said system,

The focal length that Pointing Control System is adjusted the varifocal imaging lens combination is f _l, make the ken maximum of detection system, realize the aiming of flashlight and catch;

After aiming and catching, essence is taken aim at control system control essence and is taken aim at mirror deflection, makes incident light in the imaging of the center of ccd detector, and system enters tracing process: the focal length that Pointing Control System is adjusted the varifocal imaging lens combination is β f _l, the CCD test surface is positioned on the varifocal imaging lens combination focal plane; Realization is to the tracking of incident light; And then the incident angle result of picked up signal light;

Described β is the real number greater than 1.

The incident angle result of flashlight comprises that flashlight is at the incident angle of azimuth direction with to the incident angle of flashlight in pitch orientation: flashlight at the incident angle α of azimuth direction is:

$\mathrm{\α}=\frac{(X1-X0)}{F}$

Flashlight at the incident angle β of pitch orientation is:

$\mathrm{\β}=\frac{Y1-Y0}{F}$

In the formula: (X0 Y0) is the position coordinates on the ccd detector when the flashlight incident angle is 0 °; (X1 Y1) is the position coordinates of current demand signal light on ccd detector; F is the total focal length of system.

The detection ken θ of ccd detector in aiming and acquisition procedure ₁For:

${\mathrm{\θ}}_1=m\·d\frac{f_c}{f_w\·f_l}$

In the formula: m is the pixel line number of square CCD detector, and d is the length of side of the pixel of square CCD detector, f _wBe the focal length of telephotolens, f _cIt is the focal length of eyepiece.

Ccd detector the aiming and acquisition procedure in, the detection accuracy Δ θ of the incident angle of flashlight ₁For:

$\mathrm{\Δ}{\mathrm{\θ}}_1=d\frac{f_c}{f_w\·f_l}.$

The detection ken θ of ccd detector in tracing process ₂For:

${\mathrm{\θ}}_2=m\·d\frac{f_c}{f_w\·f_l\·\mathrm{\β}}.$

The detection accuracy Δ θ of the incident angle of the flashlight of ccd detector in tracing process ₂For:

$\mathrm{\Δ}{\mathrm{\θ}}_2=d\frac{f_c}{f_w\·f_l\·\mathrm{\β}}.$

Beneficial effect: the present invention is based on the varifocal imaging lens combination and be implemented in aiming and the acquisition procedure incident light is carried out the detection of the big ken, and in tracing process, incident light is carried out detected with high accuracy, can take into account the aiming and catch, tracing process, compare and existing system and method, of the present invention in aiming and acquisition procedure the system detection ken can increase more than 10 times, detection accuracy can improve more than 10 times in the tracing process.And the present invention has overcome need focus the technology prejudice that just can survey to imaging lens group in the classic method, has realized the zoom detection to the incident angle of signal beams.

Description of drawings

Fig. 1 is the light path synoptic diagram of the present invention under aiming and acquisition procedure; Fig. 2 is the light path synoptic diagram of the present invention under tracing process.

Embodiment

Embodiment one, this embodiment is described in conjunction with Fig. 1 and Fig. 2, change ken high-precision signal angle of light degree detection system based on the varifocal imaging lens combination, it comprises that telephotolens 1, eyepiece 2, essence take aim at mirror 3, varifocal imaging lens combination 4, ccd detector 5 and Pointing Control System 6

The detectable signal output terminal of ccd detector 5 is connected with the detectable signal input end of Pointing Control System 6, the zoom control signal output terminal of Pointing Control System 6 is connected with the zoom control signal input end of varifocal imaging lens combination 4, and the essence of Pointing Control System 6 is taken aim at control signal output ends and taken aim at signal input end with the smart essence of taking aim at mirror 3 and be connected;

Telephotolens 1 focuses to eyepiece 2 with incoming signal light, and is transmitted through essence through eyepiece 2 and takes aim at mirror 3, and transmitted light is taken aim at mirror 3 through essence and reflexed to varifocal imaging lens combination 4, and reflected light focuses to the test surface of ccd detector 5 through varifocal imaging lens combination 4.

Embodiment two, based on the change ken high precision incident angle of light detection method based on the varifocal imaging lens combination of the described change ken high-precision signal angle of light degree detection system based on the varifocal imaging lens combination of embodiment one,

The focal length that Pointing Control System 6 is adjusted varifocal imaging lens combination 4 is f _l, make the ken maximum of detection system, realize the aiming of flashlight and catch;

After aiming and catching, essence is taken aim at control system 6 control essences and is taken aim at mirror 3 deflections, makes incident light in the imaging of the center of ccd detector 5, and system enters tracing process: the focal length that Pointing Control System 6 is adjusted varifocal imaging lens combination 4 is β f _l, the CCD test surface is positioned on varifocal imaging lens combination 4 focal planes; Realization is to the tracking of incident light; And then the incident angle result of picked up signal light;

Described β is the real number greater than 1.

The incident angle result of flashlight comprises that flashlight is at the incident angle of azimuth direction with to the incident angle of flashlight in pitch orientation: flashlight at the incident angle α of azimuth direction is:

$\mathrm{\α}=\frac{(X1-X0)}{F}$

Flashlight at the incident angle β of pitch orientation is:

$\mathrm{\β}=\frac{Y1-Y0}{F}$

In the formula: (X0 Y0) is the position coordinates on the ccd detector 5 when the flashlight incident angle is 0 °; (X1 Y1) is the position coordinates of current demand signal light on ccd detector 5; F is the total focal length of system.(X0 is Y0) with (X1 is to obtain under the equal situation of the focal length of varifocal imaging lens combination 4 Y1) to described position coordinates.

The detection ken θ of ccd detector 5 in aiming and acquisition procedure ₁For:

${\mathrm{\θ}}_1=m\·d\frac{f_c}{f_w\·f_l}$

In the formula: m is the pixel line number of square CCD detector, and d is the length of side of the pixel of square CCD detector, f _wBe the focal length of telephotolens 1, f _cIt is the focal length of eyepiece 2.

Ccd detector 5 the aiming and acquisition procedure in, the detection accuracy Δ θ of the incident angle of flashlight ₁For:

$\mathrm{\Δ}{\mathrm{\θ}}_1=d\frac{f_c}{f_w\·f_l}.$

The detection ken θ of ccd detector 5 in tracing process ₂For:

${\mathrm{\θ}}_2=m\·d\frac{f_c}{f_w\·f_l\·\mathrm{\β}}.$

The detection accuracy Δ θ of the incident angle of the flashlight of ccd detector 5 in tracing process ₂For:

$\mathrm{\Δ}{\mathrm{\θ}}_2=d\frac{f_c}{f_w\·f_l\·\mathrm{\β}}.$

In the present embodiment, it is catoptron that essence is taken aim at mirror 3 front ends, and Pointing Control System 6 is taken aim at mirror 3 deflections by controlling essence, realizes the angle of the incident beam of change imaging lens group 4.The pixel number of ccd detector 5 is m * m, and it is the square of d that pixel is shaped as the length of side.

By formula (1), (2) as can be known, compare tracing process, the big β of the detection ken of aiming and this system of acquisition procedure doubly.By formula (3) and (4) as can be known, compare aiming and acquisition procedure, the high β of the angular accuracy of tracing process doubly.Realized thus having taken into account and aimed at and catch and tracing process, in aiming and acquisition procedure, incident light has been carried out the big ken and survey, in tracing process, incident light has been carried out detected with high accuracy.

Claims (7)

1. based on the change ken high-precision signal angle of light degree detection system of varifocal imaging lens combination, it is characterized in that: it comprises that telephotolens (1), eyepiece (2), essence take aim at mirror (3), varifocal imaging lens combination (4), ccd detector (5) and Pointing Control System (6);

The detectable signal output terminal of ccd detector (5) is connected with the detectable signal input end of Pointing Control System (6), the zoom control signal output terminal of Pointing Control System (6) is connected with the zoom control signal input end of varifocal imaging lens combination (4), and the essence of Pointing Control System (6) is taken aim at control signal output ends and essence and taken aim at the essence of mirror (3) and take aim at signal input end and be connected;

Telephotolens (1) focuses to eyepiece (2) with incoming signal light, and be transmitted through essence through eyepiece (2) and take aim at mirror (3), transmitted light is taken aim at mirror (3) through essence and is reflexed to varifocal imaging lens combination (4), and reflected light focuses to the test surface of ccd detector (5) through varifocal imaging lens combination (4).

2. based on the flashlight incident angle detection method of the described change ken high-precision signal angle of light degree detection system based on the varifocal imaging lens combination of claim 1, it is characterized in that:

The focal length that Pointing Control System (6) is adjusted varifocal imaging lens combination (4) is f _l, make the ken maximum of detection system, realize the aiming of flashlight and catch;

After aiming and catching, essence is taken aim at control system (6) control essence and is taken aim at mirror (3) deflection, makes the center imaging of incident light at ccd detector (5), and system enters tracing process: the focal length that Pointing Control System (6) is adjusted varifocal imaging lens combination (4) is β f _l, the CCD test surface is positioned on varifocal imaging lens combination (4) focal plane; Realization is to the tracking of incident light, and then the incident angle of picked up signal light;

β is the real number greater than 1.

3. according to the described change ken high-precision signal angle of light degree detection method based on the varifocal imaging lens combination of claim 2, the incident angle that it is characterized in that flashlight comprises that flashlight is at the incident angle of azimuth direction with to the incident angle of flashlight in pitch orientation: flashlight at the incident angle α of azimuth direction is:

$\mathrm{\α}=\frac{(X1-X0)}{F}$

Flashlight at the incident angle β of pitch orientation is:

$\mathrm{\β}=\frac{Y1-Y0}{F}$

In the formula: (X0 Y0) is position coordinates on the ccd detector when the flashlight incident angle is 0 ° (5); (X1 Y1) is the position coordinates of current demand signal light on ccd detector (5); F is the total focal length of system.

4. according to the described change ken high-precision signal angle of light degree detection method of claim 2, it is characterized in that the detection ken θ of ccd detector (5) in aiming and acquisition procedure based on the varifocal imaging lens combination ₁For:

${\mathrm{\θ}}_1=m\·d\frac{f_c}{f_w\·f_l}$

In the formula: m is the pixel line number of square CCD detector, and d is the length of side of the pixel of square CCD detector, f _wBe the focal length of telephotolens (1), f _cIt is the focal length of eyepiece (2).

5. according to the described change ken high-precision signal angle of light degree detection method of claim 2, it is characterized in that ccd detector (5) in aiming and acquisition procedure, the detection accuracy Δ θ of the incident angle of flashlight based on the varifocal imaging lens combination ₁For:

$\mathrm{\Δ}{\mathrm{\θ}}_1=d\frac{f_c}{f_w\·f_l}.$

6. according to the described change ken high-precision signal angle of light degree detection method of claim 2, it is characterized in that the detection ken θ of ccd detector (5) in tracing process based on the varifocal imaging lens combination ₂For:

${\mathrm{\θ}}_2=m\·d\frac{f_c}{f_w\·f_l\·\mathrm{\β}}.$

7. according to the described change ken high-precision signal angle of light degree detection method of claim 2, it is characterized in that the detection accuracy Δ θ of the incident angle of the flashlight of ccd detector (5) in tracing process based on the varifocal imaging lens combination ₂For:

$\mathrm{\Δ}{\mathrm{\θ}}_2=d\frac{f_c}{f_w\·f_l\·\mathrm{\β}}.$

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