CN101709999B - Atom filter solar imager based on F-P etalon branch selection - Google Patents

Abstract

The invention relates to the technical field of solar imaging, particularly to an atom filter solar imager based on F-P etalon branch selection. The atom filter solar imager comprises a telescope, a heat-isolating sheet, a filter sheet, an atom filter, a beam splitter, a first F-P etalon branch selector, a first CCD, a second F-P etalon branch selector, a second CCD and a computer, wherein the telescope, the heat-isolating sheet, the filter sheet, the atom filter, the beam splitter, the first F-P etalon branch selector and the first CCD are sequentially coaxially arranged; the second F-P etalon branch selector and the second CCD are sequentially coaxially installed in the direction of a reflection optical axis of the beam splitter; and the output ends of the first CCD and the second CCD are respectively connected with the computer. A large-space high-transmission bimodal atom filter of the invention can effectively solve the problem of remarkable spectral line broadening of solar atoms; the transmission of an F-P etalon is locked at the transmission of an atom filter by utilizing the favorable condition of combining the F-P etalon and the atom filter; and the transmission wavelength stability of the etalon is effectively improved.

Description

Atom filter solar imager based on the F-P etalon branch selection

Technical field

The present invention relates to sun technical field of imaging, relate in particular to a kind of atom filter solar imager based on the F-P etalon branch selection.

Background technology

Contain a large amount of universe and celestial body information in the astronomical spectrum, depending on spectrum observation, diagnosis and development on analytical method on the degree that makes great progress of modern astronomy.By analysis and research, can obtain solar atmosphere and even its internal physical information to solar spectrum.What wherein, be most widely used is sun height (spectrum, space, time) resolution imaging observation.By observation and research to high spectral resolution sun information, help deepening understanding to solar atmosphere and internal physical process, develop more accurate Solar Physics model, also help understanding in depth generation, the rule of development of sun aggravating activities, it is carried out accurate forecast, prediction, thereby reduce the image of sun aggravating activities the earth and mankind's activity.Therefore, the observation and the research of sun high spectral resolution is had important academic significance and using value, and along with the development of modern sun physics is also more and more higher to the demand of high-resolution imaging observation.But realize the high spectral resolution imaging observation of the sun, all must utilize the optical dispersion device of high spectral resolution.Therefore, to the research of solar imager, particularly the improvement of optical dispersion device is extremely important.

The high spectrum of sun resolution imaging instrument based on atomic light filter, the atomic light filter degree of stability is good, transmissivity is high, the outer plurality of advantages such as strong and imaging that suppress of band but utilize, by carrying out the high-resolution sun doppler imaging observation based on Na (589nm), K (770nm) atomic light filter, observation when realizing to solar photosphere and chromosphere velocity field.

Wherein,, require atomic light filter can realize bimodal alternately transmission, promptly can realize " choosing is propped up " in order to handle out velocity image.The present method that is adopted in the world is that the polarization choosing is propped up, promptly by bimodal alternately to left and right rotatory polarization control realization.This method need adopt two groups of atom bubbles and magnetic field.Thermostatic assembly (being equivalent to two atomic light filters) makes system relatively complicated, but also can introduce and outer birefringence effect, influences the spectrally resolved ability of system.

The application has proposed a kind of scheme of the F-P of employing etalon branch selection, promptly props up with a spectrum choosing replacement polarization choosing.Because the existing atomic light filter of the spectrally resolved ability of system guarantees, F-P the effect is here just selected one from the bigger high resolving power spectral line of two spacings, so can greatly reduce the requirement of its spectral resolution, help simplied system structure.The application proposes suitable F-P etalon parameter, makes its transmission and characteristic and atomic light filter coordination always, simultaneously, has solved the transmission that the transmission of F-P etalon is locked in atomic light filter, realizes both stable couplings.

Summary of the invention

The purpose of this invention is to provide a kind of atom filter solar imager, adopt F-P etalon branch selection method, obtain full-time doppler image based on the F-P etalon branch selection.

For achieving the above object, the present invention adopts following technical scheme:

Telescope, heat shield, optical filter, atomic light filter, beam splitter, a F-P etalon branch selection device, a CCD, the 2nd F-P etalon branch selection device, the 2nd CCD and computing machine;

Wherein, telescope, heat shield, optical filter, atomic light filter, beam splitter, a F-P etalon branch selection device, CCD arranged in co-axial alignment successively;

Coaxial successively installation the 2nd F-P etalon branch selection device, the 2nd CCD on the direction of beam splitter reflection optical axis;

The output terminal of the one CCD, the 2nd CCD is connected with computing machine respectively.

Described atomic light filter adopts any in sodium atom light filter, potassium atom light filter, helium atom light filter, the calcium atom light filter.

The transmission spectral pattern of described sodium atom light filter, potassium atom light filter is bimodal transmission, and the spacing of transmission peaks is respectively 20GHz and 10GHz, and transmission bandwidth is 2GHz.

The present invention has the following advantages and good effect:

1) big spacing, the bimodal atomic light filter of high transmission can effectively solve the problem of the obvious broadening of spectral line of sun atom;

2) improving existing " atom " choosing scheme is that " optics " choosing is propped up, systems technology is simplified, improve its reliability and degree easy to use, can also overcome " atom " choosing signal distortion and channels crosstalk that scheme caused, improve the performance of imaging system;

3) utilize the advantage of F-P etalon and atomic light filter coupling, the method that plan adopts transmission peaks to automatically lock is locked in the atomic light filter transmission with the transmission of F-P etalon, improves the transmission peak wavelength stability of etalon effectively.

Description of drawings

Fig. 1 is the atom filter solar imager structural representation based on the F-P etalon branch selection of the present invention.

Fig. 2 is bimodal atom filter transmission spectral type curve.

Fig. 3 is atom filter and F-P etalon branch selection scheme.

Fig. 4 be atom filter bimodal with the cooperating of F-P etalon.

Fig. 5 obtains the speed picture by red-blue peak intensity picture.

Wherein,

The 01-telescope, 02-heat shield, 03-optical filter, 04-atomic light filter, 05-beam splitter, 06-the one F-P etalon branch selection device, 07-the-CCD, 08-the 2nd F-P etalon branch selection device, 09-the 2nd CCD, 10-computing machine.

Embodiment

The invention will be further described in conjunction with the accompanying drawings with specific embodiment below:

The atom filter solar imager that the present invention proposes based on the F-P etalon branch selection, adopt an atomic light filter and two F-P etalon branch selections after, detect branch spectrum sun image by CCD, treated, can obtain full-time doppler image.Adopt a F-P choosing technology only allow one of the bimodal transmission of atomic light filter at every turn, can obtain the independent sun image of red wing three quarter and blue wing three quarter respectively, the difference of both intensity is representing in the sun atom absorption line with respect to the Doppler shift of atom transmission spectrum line in the atomic light filter, promptly in the sun atom with respect to the motion of atom in the light filter.Adopt two groups of F-P spectrum to select prop, more simple in structure than the choosing of traditional polarization, avoid being subjected to the influence of birefringence effect.In addition, the present invention carries out the research of Na, K light filter simultaneously, for the observation of solar chromosphere layer and photosphere provides a kind of effective sniffer.

The solar tracking telescope obtains sun optical effect continuously, by the influence of heat insulation optics and the solar heat influence of worry light optics removal just and other wavelength parasitic lights.Place the polarization optics P1 of atom bubble front end to constitute partially and the analyzing system, with atom bubble and the attached bimodal transmission atomic light filter of the common formation of magnetic field, thermal field device with the polarization optics P2 that places atom bubble rear end.Bimodal light signal after dividing beam optics with transmission is divided into two parts, send into two F-P etalons respectively and carry out the optics choosing and prop up with the atomic light filter coupling, at last by CCD1 and CCD2 respectively to red wing three quarter and the imaging of the blue wing three quarter sun.The transmission spectral pattern of Na, K atomic light filter is bimodal transmission, and the spacing of transmission peaks is respectively 20GHz and 10GHz, and transmission bandwidth is 2GHz.

Emergent light is the transmission spectral pattern (B and R) of both wings transmission behind atomic light filter, promptly produce two transmission peaks simultaneously, this light sent into divide two-way output behind the beam splitter, one the tunnel sends into a CCD behind a F-P etalon branch selection device, can obtain the transmission information (B) of blue wing three quarter, the 2nd CCD is gone in another road behind the 2nd F-P etalon branch selection device, can obtain the transmission information (R) of red wing three quarter.

Realize the F-P etalon branch selection, require the bimodal spacing of its free spectral limit, and its transmission bandwidth is less than the bimodal spacing of atomic light filter greater than atomic light filter.And, in order to realize the stable Zhi Gongneng that selects, require the F-P etalon can not be to the bimodal transmission of skipping a grade of atomic light filter, this requires the free spectral limit of F-P etalon big as far as possible.

Computing machine is used to gather the observation data of carrying out science computing acquisition needs from the view data of CCD, finishes simultaneously the driving of F-P and the function of CCD synchro control.

Atom filter solar imager based on the F-P etalon branch selection provided by the invention, concrete structure comprises as shown in Figure 1: telescope 01, heat shield 02, optical filter 03, atomic light filter 04, beam splitter 05,06,08, two CCD07,09 of F-P etalon branch selection device, and computing machine 10 is formed; Wherein: telescope 01, heat shield 02, optical filter 03, atomic light filter 04, beam splitter 05, a F-P etalon branch selection device 06, a CCD 07 be arranged in co-axial alignment successively; Coaxial successively installation the 2nd F-P etalon branch selection device 08, the 2nd CCD09 on the direction of beam splitter 05 reflection optical axis, the output terminal of a CCD 07, the 2nd CCD09 is connected with computing machine 10 respectively.

Wherein: described atomic light filter 04 adopts sodium atom light filter or potassium atom light filter or helium atom light filter, or the calcium atom light filter.

Workflow based on the atom filter solar imager of F-P etalon branch selection:

Sunshine collected by telescope 01 and collimation after heat shield 02 and optical filter 03 wiping out background light, keep sodium light spectrum composition, the i.e. absorption of solar atmosphere sodium atom.Obtain the both wings transmission result of sodium absorption line again through atomic light filter 04, wherein bimodal atom filter transmission spectral pattern as shown in Figure 2.With beam splitter the transmission result of bimodal atom filter is divided into two, send into the first etalon branch selection device 06 and the second etalon branch selection device 08 respectively, atom filter and F-P etalon branch selection scheme are as shown in Figure 3, then through the incident light adjustment of precision, can make it respectively only by red wing three quarter and blue wing three quarter, atom filter bimodal with the cooperating as shown in Figure 4 of F-P etalon.With the spectral characteristic that obtains, send into two CCD, can obtain two width of cloth images (R and B) of the different spectral characteristics of the sun, the difference of both intensity is representing in the sun atom absorption line with respect to the Doppler shift of atom transmission spectrum line in the atomic light filter.Computing machine is used for gathering and handling this two width of cloth image, and it is carried out difference processing, can obtain the speed of related movement of atom in the sun.Deduct information such as known solar rotation, day ground speed of related movement again, obtain the clean movement velocity of sun material in the solar atmosphere, as shown in Figure 5.

Claims (1)

1. the atom filter solar imager based on the F-P etalon branch selection is characterized in that, comprising:

Telescope (01), heat shield (02), optical filter (03), atomic light filter (04), beam splitter (05), a F-P etalon branch selection device (06), a CCD (07), the 2nd F-P etalon branch selection device (08), the 2nd CCD (09) and computing machine (10);

Wherein, telescope (01), heat shield (02), optical filter (03), atomic light filter (04), beam splitter (05), a F-P etalon branch selection device (06), a CCD (07) arranged in co-axial alignment successively;

Coaxial successively installation the 2nd F-P etalon branch selection device (08), the 2nd CCD (09) on the direction of beam splitter (05) reflection optical axis;

The output terminal of the one CCD (07), the 2nd CCD (09) is connected with computing machine (10) respectively;

Behind described atomic light filter, emergent light is the transmission spectral pattern of both wings transmission, emergent light sent into divide two-way output behind the described beam splitter, one the tunnel sends into a CCD behind a F-P etalon branch selection device, obtain the transmission information of blue wing three quarter, the 2nd CCD is gone in another road behind the 2nd F-P etalon branch selection device, obtain the transmission information of red wing three quarter;

Described atomic light filter (04) adopts any in sodium atom light filter, potassium atom light filter, helium atom light filter, the calcium atom light filter;

The transmission spectral pattern of described sodium atom light filter, potassium atom light filter is bimodal transmission, and the spacing of transmission peaks is respectively 20GHz and 10GHz, and transmission bandwidth is 2GHz.

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