CN100568045C

CN100568045C - A kind of high resolution imaging self-adaptive optical telescope that is suitable for working by day

Info

Publication number: CN100568045C
Application number: CNB2006101124346A
Authority: CN
Inventors: 饶长辉; 吴碧琳
Original assignee: Institute of Optics and Electronics of CAS
Current assignee: Institute of Optics and Electronics of CAS
Priority date: 2006-08-17
Filing date: 2006-08-17
Publication date: 2009-12-09
Anticipated expiration: 2026-08-17
Also published as: CN1908722A

Abstract

A kind of high resolution imaging self-adaptive optical telescope that is suitable for working by day, comprise telescopic system, precision tracking system, ADAPTIVE OPTICS SYSTEMS (comprising high-precision tracking loop and high-order error correction loop) and imaging system, the precision tracking detection system is arranged in Kuder room in the precision tracking system, thereby makes precision tracking system, high-precision tracking loop and high-order error correction loop common optical axis; The core sensitive detection parts of the system of precision tracking simultaneously are EMCCD, (read noise＜1e because the EMCCD noise is little ^-) the quantum efficiency height, can improve system's detectivity; Utilize the spectroscope beam split, make Hartmann sensor work in near-infrared band, weakened the influence of strong bias light on daytime, improved high-precision tracking loop the calibration capability of remaining integral inclination error and high-order error correction loop calibration capability to the high-order error; The detector of imaging system is a near infrared detector, has overcome strong bias light and the relative stronger influence of atmospheric turbulence on daytime, has improved the imaging resolving power.

Description

A kind of high resolution imaging self-adaptive optical telescope that is suitable for working by day

Technical field

The present invention relates to a kind of telescope, particularly be suitable for the high resolution imaging self-adaptive optical telescope that works by day.

Background technology

ADAPTIVE OPTICS SYSTEMS is a kind of real-time detection and proofreaies and correct the system of optical wavefront aberration at random.Conventional self-adaptive optical telescope is operated in the visible light wave range scope.The service band of the smart tracking loop of the 943rd page Yunnan Observatory 1.2m self-adaptive optical telescope is 0.4um-0.43um among the SPIE that published in 2004, the service band of high-precision tracking loop and high-order error correction loop is 0.43um-0.7um, and the service band of imaging system is 0.7um-1.0um.Because the intensity of sky background is very big in the visible light wave range scope, this self-adaptive optical telescope does not possess the ability that works by day; The system of precision tracking simultaneously is positioned at telescope lens barrel bottom, and smart tracking loop and high-precision tracking loop high-order error correction loop be common optical axis not.

Summary of the invention

The technical matters that the present invention solves is: overcome the problem that existing self-adaptive optical telescope can not work by day, a kind of high resolution imaging self-adaptive optical telescope that is suitable for working by day is provided, possesses by day the ability of weak echo signal Wavefront detecting and high resolution imaging under the strong daylight background.

Technical solution of the present invention is: the high resolution imaging self-adaptive optical telescope that is suitable for working by day, it is characterized in that: comprise telescopic system, precision tracking system, ADAPTIVE OPTICS SYSTEMS (comprising high-precision tracking loop and high-order error correction loop) and imaging system, it is characterized in that: affiliated precision tracking detection system is arranged in Kuder room; Precision tracking detection system core sensitive detection parts are EMCCD; The core sensitive detection parts of imaging system are near infrared detector, utilize the spectroscope beam split, make Hartmann sensor work in near-infrared band.

The present invention compared with prior art has following advantage:

(1) smart tracker is placed Kuder room, make precision tracking system, high-precision tracking loop and high-order error correction loop common optical axis, improved the detection accuracy of system; The core sensitive detection parts of the detection system of precision tracking simultaneously are EMCCD, (read noise＜1e because the EMCCD noise is little ^-) the quantum efficiency height, thereby raising is to the calibration capability of integral inclination error;

(2) utilize the spectroscope beam split, widened the service band of high-precision tracking loop and high-order error correction loop, because its part service band is a near-infrared band, weakened the influence of strong bias light on daytime, improved high-precision tracking loop the calibration capability of remaining integral inclination error and high-order error correction loop calibration capability to the high-order error.The imaging system service band is a near-infrared band, has overcome strong bias light and the relative stronger influence of atmospheric turbulence on daytime, has improved the imaging resolving power.

Description of drawings

Fig. 1 is self-adaptive optical telescope synoptic diagram among the present invention;

Fig. 2 is the structural representation of Kuder room of the present invention;

Fig. 3 is an imaging system synoptic diagram of the present invention.

Among the figure: 1. primary mirror, 2. secondary mirror, 3. catoptron, 4. inclined mirror, 5. catoptron, 6. catoptron, 7. spectroscope, 8. catoptron, 9. catoptron, 10. off-axis paraboloidal mirror, 11. off-axis paraboloidal mirrors, 12. field lenses, 13. inclined mirror, 14. distorting lenss, 15. spectroscopes,

beam system

1,17. catoptron 16. contract, 18. beam systems 2 that contract, 19. imaging system, 20. Hartmann sensors, 21. wave front processors, 22.EMCCD detector, 23. smart tracker processors, 24. telescopic systems, 25. the precision tracking system, 26. follow the tracks of object lens, 27. ADAPTIVE OPTICS SYSTEMS, 28. imaging detector, 29. the image acquisition register system, 30. image-forming objective lens groups, 31. atmospheric dispersion correctors, 32. the optical filter dish, 33. field stops.

Embodiment

As shown in Figure 1, the present invention is made up of telescopic system 24, precision tracking system 25, ADAPTIVE OPTICS SYSTEMS 27 and imaging system 19, and telescopic system 24 is made up of primary mirror 1, secondary mirror 2, catoptron 3; Precision tracking system 25 by a loop by large travel high-speed inclined mirror 4, catoptron 5 and 6, spectroscope 7, follow the tracks of object lens 26, smart tracking detector EMCCD detector 22 and smart tracker processor 23 are formed, be used to proofread and correct the residual error of the thick tracking loop of telescope, wherein the precision tracking detection system of being made up of tracking object lens 26 and smart tracking detector EMCCD detector 22 is arranged in Kuder room; Light from target is through primary mirror 1, secondary mirror 2, catoptron 3, after arriving high speed inclined mirror 4, enter Kuder room through catoptron 6 again, the light part that enters Kuder room enters the EMCCD detector 22 of precision tracking system 25 through spectroscope 7 reflections, another part enters the beam system 16 that contracts after spectroscope 7 transmissions arrive catoptron 8 and 9, contract beam system 16 by off-axis

paraboloidal mirror

10,11 and field lens 12 form, the effect of beam system 16 of contracting is the beam size that telescope comes to be compressed to the distorting lens bore mate, and make telescope primary mirror 1 and distorting lens 14 satisfy the image conjugate relation, light by the beam system that contracts arrives spectroscope 15 through high speed inclined mirror 13 and distorting lens 14, light from spectroscope 15 reflections, again through entering Hartmann sensor 20 behind the catoptron 17 and the beam system 18 that contracts, enter imaging system 19 from the light of spectroscope 15 transmissions, the main effect of the beam system 18 that wherein contracts is that beam size is narrowed down to the beam size that mates with array lens.

ADAPTIVE OPTICS SYSTEMS 27 ADAPTIVE OPTICS SYSTEMS are made up of two corrective loops: the residual error that high-precision tracking control loop mainly adopts high speed inclined mirror 13 to proofread and correct smart tracking control loop, its control signal is provided by the integral inclination signal of Shack-Hartmann wavefront sensor, beam split be can reduce like this, the control bandwidth and the accuracy requirement of target slant correction satisfied; Serve as reasons high frame frequency low light level Shack-Hartmann wave front sensor 20, distorting lens 14 and real-time wave front processor 21 of second loop formed the high-order error correction loop, is used to proofread and correct higher order aberratons and static aberration that atmospheric turbulence and telescope shake produce.

As shown in Figure 2, core devices in the Kuder room has EMCCD detector 22, Hartmann sensor 20 and imaging detector 28, EMCCD detector 22 is mainly used in surveys the integral inclination signal, smart tracker processor is surveyed the integral inclination Error Calculation that obtains according to EMCCD detector 22 and is gone out to control Control of Voltage inclined mirror 4, thereby realizes the correction to the integral inclination error.Hartmann sensor 20 is used to survey remaining integral inclination sum of errors high-order error, calculates control signal control inclined mirror 13 and distorting lens 14 by wave front processor 21 again, thereby realizes the correction to remaining integral inclination sum of errors high-order error.

As shown in Figure 3, imaging system is by imaging detector 28, image acquisition register system 29, image-forming objective lens group 30, atmospheric dispersion corrector 31, optical filter dish 32 and field stop 33 etc.Image-forming objective lens 30 has different coke ratios, is used to regulate different imaging viewing fields.Atmospheric dispersion corrector 31 is used to compensate the influence of atmospheric dispersion.Neutral colour filter and spectral filter are housed, the influence that is used to regulate luminosity and suppresses bias light on the optical filter dish 32.Imaging detector 28 is a near infrared detector, thereby makes that the imaging system service band is a near-infrared band, has overcome strong bias light and the relative stronger influence of atmospheric turbulence on daytime, has improved the imaging resolving power.

Claims

1, is suitable for the high resolution imaging self-adaptive optical telescope that works by day, by telescopic system (24), precision tracking system (25), ADAPTIVE OPTICS SYSTEMS (27), comprise that high-precision tracking loop and high-order error correction loop and imaging system (19) form, it is characterized in that: described precision tracking system (25) is arranged in Kuder room, thereby make precision tracking system, high-precision tracking loop and high-order error correction loop common optical axis, improved the detection accuracy of system.

2, the high resolution imaging self-adaptive optical telescope that is suitable for working by day according to claim 1 is characterized in that: described precision tracking system (25) forms by following the tracks of object lens (26), inclined mirror (13), smart tracking detector EMCCD (22) and smart tracker processor (23); EMCCD detector (22) is used to survey the integral inclination signal, smart tracker processor (23) is surveyed the integral inclination Error Calculation that obtains according to EMCCD detector (22) and is gone out to control Control of Voltage inclined mirror (13), thereby realizes the correction to the integral inclination error.

3, the high resolution imaging self-adaptive optical telescope that is suitable for working by day according to claim 1, it is characterized in that: described imaging system is made up of imaging detector (28), image acquisition register system (29), image-forming objective lens group (30), atmospheric dispersion corrector (31), optical filter dish (32) and field stop (33), and wherein imaging detector (28) is a near infrared detector.