CN105911705A - Light spot center extraction device based on prism segmentation and method thereof - Google Patents

Abstract

The invention discloses a light spot center extraction device based on prism segmentation and a method thereof. The device adopts a beam splitter and ridge prisms to segment a light beam received by an optical system. The beam splitter splits the light beam into two beams of light with mutually orthogonal spaces. A horizontal detection unit and a vertical detection unit are used to detect the two beams of light respectively. The ridge prisms in the detection units divide an incident light beam into two beams of light which have opposite directions and are located at a same straight line. A focusing lens is used to converge the light and a silicon photoelectric diode is used to carry out light intensity detection. A computer carries out data processing on four paths of light intensity information detected by the horizontal detection unit and the vertical detection unit so as to acquire a center of a light spot to be detected. In the invention, an optical element is used to carry out light spot image segmentation, the method is novel, easy and practicable, and simultaneously high precision light spot center extraction can be realized.

Description

The device and method that a kind of spot center based on prism segmentation is extracted

Technical field:

The present invention relates to high-precision optical detection, be specifically related to a kind of method that spot center is extracted, can be used for The extraction of beacon beam spot center in laser space communication capture, tracking and sighting system.

Background technology:

The core technology of satellite laser communications is capture, follows the tracks of and point technique, and the pointing of microradian magnitude Technology is difficult point therein.High-precision pointing needs to obtain accurately the central information of pointing reference source, with The central information of this pointing reference source instructs being accurately directed to of ICBM SHF satellite terminal light beam, and then realizes laser satellite The foundation of communication link and maintenance.Cause being difficult to accurately extract beacon hot spot yet with there is problems with Center:

1. the essence tracing subsystem detector of capture, tracking and sighting system needs to meet certain visual field simultaneously Higher beacon hot spot center extraction precision, the center of beacon hot spot is extracted by traditional detector, There is the problems such as detector pixel is non-homogeneous, filling rate is low, quantum efficiency is low.

2. the essence tracing subsystem detector of capture, tracking and sighting system needs to meet higher detection frame Frequency is to realize the disturbance rejection bandwidth of degree of precision, and traditional detector is to realize higher detection frame frequency needs The circuit design and the data that carry out complexity process.

Summary of the invention:

In order to solve problem present in background technology, present invention employs method based on prism segmentation, by Beam splitter is treated the light beam at light-metering speckle place and is split, and is divided into two-beam horizontally and vertically, Respectively enter level detection unit and vertical sounding unit, level detection unit and the composition of vertical sounding unit Identical with principle, but the placement orientation in space is different, the light that the roof prism in each probe unit will enter Bundle be divided into be on same straight line, two-beam in opposite direction, more every Shu Guangyong condenser lens is converged, With silicon photoelectric diode, its intensity signal is detected, four road intensity signal input service meters of detection gained Calculation machine carries out data process, to draw the center of hot spot to be measured.

A kind of spot center extraction element based on prism segmentation of the present invention and method, including: beam splitter 1, Level detection unit 2, vertical sounding unit 3, working computer 4, wherein level detection unit 2 is with vertical The composition of probe unit 3 is identical with principle, the most mutually orthogonal placement, and level detection unit 2 is with vertical Straight probe unit 3 the most all include a roof prism, the first condenser lens and the second condenser lens, first Silicon photoelectric diode and the second silicon photoelectric diode, whole spot center extraction element is characterised by:

Spot center extraction element is placed on stabilized platform, and is rigidly connected with stabilized platform；Hot spot to be measured The light beam at center, after beam splitter 1, is divided into two-beam horizontally and vertically, horizontal direction and The light beam of vertical direction is detected by level detection unit 2 and vertical sounding unit 3 respectively.Light beam enters In each probe unit, be first divided into by roof prism be on same straight line, two-beam in opposite direction, then By the first condenser lens and the second convergent lens, two-beam is converged respectively, then by the first silicon photoelectricity two pole Pipe and the second silicon photoelectric diode carry out light intensity detection to the light after converging.Finally by two probe unit detections Four road intensity signal input service computers 4 of gained carry out data and process with the center obtaining hot spot to be measured.

The extracting method of spot center, it is characterised in that comprise the following steps:

1. use optical element to carry out light beam segmentation: to use beam splitter 1 to be divided into by incident beam mutually orthogonal Horizontal direction light beam and vertical direction light beam, respectively enter level detection unit 2 and vertical sounding unit 3 enters Row detection, light beam is divided into and is on same straight line by the roof prism in each probe unit, in opposite direction Two-beam.

2. the data of spot center extraction element process: in working computer 4, level detection unit visit Survey energy X1, X2 and energy Y1, Y2 of vertical sounding unit detection gained of gained, carry out at data Reason, obtains spot center coordinate (X, Y), and operational formula is:

$X=K\frac{(X1+Y1)-(X2+Y2)}{X1+X2+Y1+Y2}$

$Y=K\frac{(X1+X2)-(Y1+Y2)}{X1+X2+Y1+Y2}$

Wherein K is proportionality coefficient, the calibration results be given.

The method have the advantages that:

1. use the ridge of roof prism that hot spot is split: to utilize roof prism optical characteristics to be divided by incident illumination One-tenth is on same straight line, two-beam in opposite direction, and the machining accuracy of prism and rigidity can reach higher Level, when using in capture, tracking and sighting system, can improve the anti-vibration capacity of resisting disturbance of system.

2. use silicon photoelectric diode to carry out light intensity detection: silicon photoelectric diode photosurface is big, can be the most defeated Go out the energy information of incident illumination, meet the system demand to height detection frame frequency, it is possible to achieve the line that system is higher Property degree and sensitivity.

3. use four independent silicon photoelectric diodes to carry out light intensity detection, conveniently carry out different silicon photoelectricity two The consistency calibration of pole pipe, such that it is able to reach higher spot center extraction accuracy.

4. the system integration is higher, has high-performance, the advantage of high reliability.

Accompanying drawing illustrates:

Fig. 1 is the systematic schematic diagram of spot center extracting method.In figure: beam splitter 1；Level detection unit 2；Vertical sounding unit 3；Working computer 4.

Fig. 2 is level detection unit or the schematic diagram of vertical sounding unit.In figure: roof prism 5；The One condenser lens 6；Second condenser lens 7；First silicon photoelectric diode 8；Second silicon photoelectric diode 9.

Detailed description of the invention:

Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is further described:

The device of the present invention a kind of spot center extracting method as shown in Figure 1, uses beam splitter to incident illumination Splitting, be divided into two-beam horizontally and vertically, two-beam respectively enters level detection unit With in vertical sounding unit, the composition of each probe unit as shown in Figure 2, enters in each probe unit Light beam be divided into by roof prism and be in same straight line, two-beam in opposite direction, often bundle light uses and focuses on thoroughly Mirror converges, and re-uses silicon photoelectric diode and the light after converging is carried out energy detection.Incident illumination is selected The laser instrument of 670nm simulates remote directional light through collimator, and receiving optics selects 200mm The telescope of bore 2m focal length.Beam splitter select THORLABS company splitting ratio be 50:50 non-partially Shake beam-dividing cube BS031, and its operation wavelength optimal wavelength is between 400nm to 700nm；Ridge rib The knife edge right angle roof prism MRAK25-E02 of THORLABS company selected by mirror, and its operation wavelength is optimal Wavelength is between 400nm to 750nm；Silicon photoelectric diode selects the SM1PD1B of THORLABS company The bulk silicon photodiode encapsulated, plus earth, a diameter of 9mm of photosurface.Level detection The incoming working computer of intensity signal of unit and vertical sounding unit detection gained totally four road light carries out data Process, thus the center location information of hot spot to be measured can be drawn.

Claims (2)

1. the device that spot center based on prism segmentation is extracted, including: beam splitter (1), level is visited Survey unit (2), vertical sounding unit (3), working computer (4), it is characterised in that:

Described level detection unit (2) is identical with the structure of described vertical sounding unit (3), its bag Include roof prism (5), the first condenser lens (6) and the second condenser lens (7), the first silicon photoelectricity two pole Pipe (8) and the second silicon photoelectric diode (9), the light beam of spot center to be measured is by described roof prism (5) Be divided into be on same straight line, two-beam in opposite direction, the most respectively by described first condenser lens (6) With described second convergent lens (7), two-beam is converged, then by described first silicon photoelectric diode (8) With described second silicon photoelectric diode (9), the light after converging is carried out light intensity detection；

Described spot center extraction element is placed on stabilized platform, and is rigidly connected with stabilized platform；Treat The light beam of survey spot center, after described beam splitter (1), is divided into two horizontally and vertically Shu Guang, light beam horizontally and vertically respectively by described level detection unit (2) and described vertically Probe unit (3) detects；Finally by four road intensity signal inputs of two probe unit detection gained Described working computer (4) carries out data and processes with the center obtaining hot spot to be measured.

2. the light of the device extracted based on spot center based on prism segmentation a kind of described in claim 1 The extracting method at speckle center, it is characterised in that method is as follows:

The level detection unit of input service computer (4) is detected light intensity X1 of gained, X2 with vertical Probe unit detection light intensity Y1 of gained, Y2, carry out data process, obtain spot center coordinate (X, Y), The formula that data process is:

$X=K\frac{(X1+Y1)-(X2+Y2)}{X1+X2+Y1+Y2}$

$Y=K\frac{(X1+X2)-(Y1+Y2)}{X1+X2+Y1+Y2}$

Wherein K is proportionality coefficient, the calibration results be given.