Double-view-field and double-waveband Doppler differential interferometer optical system for measuring atmospheric wind field

Abstract

The invention discloses a Doppler differential interferometer optical system for measuring a double-view-field and double-waveband atmospheric wind field, relates to the technical field of optical systems of interferometers, and aims to solve the problem that double-market and double-waveband detection imaging cannot be realized due to the fact that central view fields of fringes in an existing double-view-field detection imaging domain are overlapped. The system comprises an orthogonal light inlet channel, a front double telecentric lens group, an interference unit, a rear imaging unit and a calibration unit, the gas glow enters the interference unit through the orthogonal light inlet channel and the front double telecentric lens group to form interference fringes, and the interference fringes are imaged through the rear imaging unit; light emitted by the calibration unit enters the front telecentric lens group, and finally forms an image through the interference unit and the rear imaging unit in sequence. And separation of double-view-field detection stripes is realized by using two groups of cylindrical mirrors. And the two-view-field gas glow respectively enters the corresponding cylindrical mirror groups to realize vertical view field separation, so that a double-view-field and double-waveband interference fringe pattern is obtained. And the cylindrical mirror group can separate the overlapped part of the imaging areas of the two view fields. The structure is simple, the cost is low and the system stability is higher.

Description

Technical Field

[0001] The invention relates to the technical field of interferometer optical systems, and in particular to a dual-field-of-view dual-band atmospheric wind field measurement Doppler differential interferometer optical system. Background Art

[0002] After the atmospheric light source radiation in the target area passes through the Doppler differential interferometer system, the interference fringes formed are imaged on the detector. The obtained interference pattern is processed to obtain the phase change, and then the spectral line Doppler frequency shift is obtained, and finally the atmospheric wind field information is obtained.

[0003] Interference spectroscopy technology is widely used in a variety of passive wind field detection systems due to its high throughput, high signal-to-noise ratio and high resolution. Depending on the detection area, different bands of target detection light sources need to be selected. For example, for air layer detection of 80km to 120km, the 557.7nm oxygen atom green line needs to be selected, and for air layer detection of 120km to 300km, the 630nm oxygen atom red line needs to be selected. However, the passive wind field detection instruments currently in use mostly adopt a single-field-of-view single-band design. The time resolution of such designs is usually low and the detection area is small. Wind field detection equipment should have a high time resolution in order to quickly obtain wind field information in the target detection area in a short time, and be able to image information of different bands and fields of view separately in the imaging domain as an effective basis for wind field detection.

[0004] The Chinese patent publication number is "CN104034421A", and the patent name is "Dual-field Doppler heterodyne interferometer". It uses two upper and lower reflectors set in the vertical field of view of the pupil, and only one set of cylindrical mirrors is placed, which is divided into two areas to receive the target collimated light beam with an azimuth difference of 90°. The imaging domain is the same, the interference fringes will overlap, and dual-field dual-band detection imaging cannot be achieved. Summary of the invention

[0005] The present invention aims to solve the problem that the central fields of view of the existing dual-field-of-view detection and imaging domain stripes overlap and dual-market dual-band detection and imaging cannot be achieved, and provides a dual-field-of-view dual-band atmospheric wind field measurement Doppler differential interferometer optical system.

[0006] The technical solution of the present invention is as follows:

[0007] A dual-field-of-view dual-band atmospheric wind field measurement Doppler differential interferometer optical system, characterized in that it includes an orthogonal light input channel, a front double telecentric mirror group, an interference unit, a rear imaging unit and a calibration unit;

[0008] The airglow enters the interference unit through the orthogonal light channel and the front double telecentric lens group to form interference fringes and is imaged by the rear imaging unit;

[0009] The light emitted by the calibration unit enters the front telecentric lens group, and then passes through the interference unit and the rear imaging unit in sequence to finally form an image.

[0010] The orthogonal light input channel is divided into a first light input channel and a second light input channel, and the first light input channel and the second light input channel are two orthogonal field of view light input channels at the same atmospheric height;

[0011] The light inlet channel comprises a channel rectangular aperture stop, a channel reflector and a channel field of view spectroscope arranged in sequence along the light path; the front surface of the channel field of view spectroscope is coated with a reflective film, and the rear surface is coated with an anti-reflection film;

[0012] The airglow light enters the first channel rectangular aperture diaphragm and reaches the first channel reflector. It is reflected by the first channel reflector to the first channel field beam splitter. It is reflected by the front surface of the first channel field beam splitter and enters the front double telecentric mirror group.

[0013] The two light entry channels include a two-channel rectangular aperture diaphragm, a two-channel reflector, and a two-channel field of view beam splitter arranged in sequence along the optical path; the front surface of the two-channel field of view beam splitter is coated with a reflective film, and the rear surface is coated with an anti-reflection film; the one-channel field of view beam splitter and the two-channel field of view beam splitter are stacked up and down and are orthogonal;

[0014] The airglow light enters the two-channel rectangular aperture diaphragm and reaches the two-channel reflector. It is then reflected by the two-channel reflector to the two-channel field beam splitter. It is then reflected by the front surface of the two-channel field beam splitter and enters the front double telecentric mirror group.

[0015] The front double telecentric mirror group includes a front telecentric mirror group 1, a field diaphragm located at the primary image plane and a front telecentric mirror group 2; the air glow light is emitted to the front telecentric mirror group 1 through an orthogonal light input channel, enters the front telecentric mirror group 2 through the field diaphragm, and the air glow light is then incident on the interference unit through the front telecentric mirror group 2.

[0016] The interference unit includes a beam splitter prism, a first field-of-view expanding prism, a second field-of-view expanding prism, a first echelle grating and a second echelle grating;

[0017] The first echelle grating and the second echelle grating have the same specification parameters, and the number of grating lines is 64lp / mm;

[0018] The light outputted by the front double telecentric lens group enters the beam splitter prism, and the beam splitter prism forms the first light beam by transmission and forms the second light beam by reflection.

[0019] The first light beam passes through the first field-expanding prism and reaches the first echelle grating to be diffracted and reflected. After being diffracted by the first echelle grating, the first light beam passes through the first field-expanding prism and enters the beam splitter prism again, and is reflected by the beam splitter prism.

[0020] The second light beam passes through the second field-expanding prism and reaches the second echelle grating to be diffracted and reflected. After being diffracted by the second echelle grating, the second light beam passes through the second field-expanding prism and enters the beam splitter prism again, and is transmitted through the beam splitter prism.

[0021] The first light beam reflected by the beam splitter prism and the second light beam transmitted by the beam splitter prism are superimposed and interfered before entering the post-imaging unit; the two light beams enter the post-imaging unit after superimposition and interference.

[0022] The post-imaging unit includes a projection lens group, a cylindrical lens group, a dichroic mirror, a filter and a detector in sequence;

[0023] The projection lens group is divided into a projection lens group 1 and a projection lens group 2;

[0024] The cylindrical mirror group is divided into a one-channel cylindrical mirror group and a two-channel cylindrical mirror group. The one-channel cylindrical mirror group and the two-channel cylindrical mirror group have the same specifications and parameters, are stacked up and down, and have optical power only in the vertical direction. The one-channel cylindrical mirror group and the two-channel cylindrical mirror group each include five cylindrical mirrors coaxially arranged in sequence, and the focal length of each mirror group in the vertical direction is 59 mm;

[0025] The dichroic mirror is a wedge-shaped prism, and the angle between the front surface and the rear surface is α, -1°≤α≤1°; the front surface of the dichroic mirror is coated with a dichroic film that reflects the wavelength of 557.7nm light and transmits the wavelength of 630nm light, and the rear surface is coated with a reflective film that reflects the wavelength of 630nm light;

[0026] The filter is used in partitions, including a first filter partition and a second filter partition, the working wavelength of the first filter partition is 557.7nm, and the working wavelength of the second filter partition is 630nm;

[0027] A filter is arranged in front of the detector, and the arrangement direction of the two partitions of the filter is orthogonal to the dual field of view splicing direction;

[0028] The light emitted from the beam splitter prism is incident on the dichroic mirror through the projection mirror group 1, the projection mirror group 2, and the cylindrical mirror group; the 557.7nm air glow light is reflected by the front surface of the dichroic mirror, passes through the filter and is imaged on the detector; the 630nm air glow light is reflected by the rear surface of the dichroic mirror, passes through the filter and is finally imaged on the detector.

[0029] The gas glow light entering the system through the first light inlet channel finally passes through the first channel cylindrical lens group through the projection lens group, is imaged on the detector through the filter, and generates the first interference pattern and the third interference pattern;

[0030] The gas glow light entering the system through the two light input channels finally enters the two-channel cylindrical lens group through the projection lens group, is imaged on the detector through the filter, and generates the second interference pattern and the fourth interference pattern;

[0031] The first interference fringe pattern is the interference fringe pattern formed on the detector by the light signal with a wavelength of 557.7nm in the first field of view, the second interference fringe pattern is the interference fringe pattern formed on the detector by the light signal with a wavelength of 557.7nm in the second field of view, the third interference fringe pattern is the interference fringe pattern formed on the detector by the light signal with a wavelength of 630nm in the first field of view, and the fourth interference fringe pattern is the interference fringe pattern formed on the detector by the light signal with a wavelength of 630nm in the second field of view.

[0032] The calibration unit includes a calibration light source and a collimator; the calibration unit can effectively remove phase drift errors through phase tracking;

[0033] The light emitted by the calibration light source is collimated by a collimator and then enters the front telecentric mirror group; the outgoing light first passes through a one-channel field of view beam splitter and a two-channel field of view beam splitter at the same time to enter the front telecentric mirror group 1, then passes through the field of view diaphragm and the front telecentric mirror group 2, exits the telecentric mirror group, and then passes through the interference unit and the post-imaging unit in sequence to finally form an image.

[0034] Beneficial effects of the present invention:

[0035] 1. The dual-field detection mode of the present invention realizes dual-field detection by orthogonal light input channels. Compared with the use of two single machines with complex structure and high cost to realize dual-field detection, the present invention uses orthogonal light input channels to share all subsequent optical paths, which has a simple structure, low cost and higher system stability.

[0036] 2. The present invention uses two groups of cylindrical mirrors to separate the detection fringes of the dual-viewing field. The two-viewing field gas glow enters the corresponding cylindrical mirror group to separate the vertical field of view, and obtains the dual-viewing field dual-band interference fringe pattern. Compared with other dual-viewing field imaging schemes, the cylindrical mirror group of the present invention can separate the superimposed part of the two-viewing field imaging area. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the optical system structure of a dual-field-of-view dual-band atmospheric wind field measurement Doppler differential interferometer of the present invention;

[0038] Figure 2 This is a schematic diagram of the placement of the beam splitter in the light inlet channel of the present invention;

[0039] Figure 3 It is a schematic diagram of the cylindrical mirror assembly of the present invention;

[0040] Figure 4 is a schematic diagram of the optical filter of the present invention;

[0041] Figure 5 This is a simulated interference fringe pattern in an embodiment of the present invention.

[0042] in:

[0043] 1-orthogonal light input channel, 11-light input channel one, 12-light input channel two, 110-channel rectangular aperture diaphragm, 111-channel reflector, 112-channel field of view spectroscope, 120-channel rectangular aperture diaphragm, 121-channel reflector, 122-channel field of view spectroscope;

[0044] 2-front double telecentric mirror group, 21-front telecentric first mirror group, 22-front telecentric second mirror group, 23-field stop;

[0045] 3-interference unit, 31-beam splitter prism, 32-first field-of-view prism, 33-second field-of-view prism, 34-first echelle grating, 35-second echelle grating;

[0046] 4-rear imaging unit, 40-projection lens group, 401-projection lens group 1, 402-projection lens group 2, 41-cylindrical lens group, 411-one-channel cylindrical lens group, 412-two-channel cylindrical lens group, 42-dichroic mirror, 43-filter, 44-detector;

[0047] 431-filter partition one, 432-filter partition two;

[0048] 441 - first interference fringe pattern, 442 - second interference fringe pattern, 443 - third interference fringe pattern, 444 - fourth interference fringe pattern; 5 - calibration unit, 50 - calibration light source, 51 - collimating mirror. DETAILED DESCRIPTION

[0049] The present invention will be further described and illustrated below in conjunction with the accompanying drawings and specific implementation methods.

[0050] The present invention aims to solve the problem that the central fields of view of the existing dual-field-of-view detection and imaging domain stripes overlap and dual-market dual-band detection and imaging cannot be achieved, and provides a dual-field-of-view dual-band atmospheric wind field measurement Doppler differential interferometer optical system.

[0051] The technical solution of the present invention is as follows:

[0052] like Figure 1 As shown, the present invention provides a dual-field-of-view dual-band atmospheric wind field measurement Doppler differential interferometer optical system, comprising an orthogonal light input channel 1, a front double telecentric mirror group 2, an interference unit 3, a rear imaging unit 4 and a calibration unit 5. The airglow enters the interference unit 3 through the orthogonal light input channel 1 and the front double telecentric mirror group 2 to form interference fringes and is imaged by the rear imaging unit 4; the light emitted by the calibration unit 5 enters the front telecentric mirror group 2, and then passes through the interference unit 3 and the rear imaging unit 4 in sequence to finally form an image.

[0053] The gas glow light enters the interference unit 3 through the orthogonal light inlet channel 1 and the front double telecentric lens group 2 to form interference fringes and reaches the detector 44 for imaging through the rear imaging unit 4.

[0054] The orthogonal light input channel 1 is divided into a first light input channel 11 and a second light input channel 12. The first light input channel 11 and the second light input channel 12 are two orthogonal field of view light input channels at the same atmospheric height.

[0055] The first light inlet channel 11 comprises a channel rectangular aperture stop 110, a channel reflector 111, and a channel field of view spectroscope 112 which are sequentially arranged along the light path.

[0056] The airglow light enters the first channel rectangular aperture diaphragm 110 and reaches the first channel reflector 111, is reflected by the first channel reflector to the first channel field spectrometer 112, and is reflected by the front surface of the first channel field spectrometer to enter the front double telecentric lens group 2.

[0057] The front surface of the one-channel field-of-view beam splitter 121 is coated with a reflective film, and the rear surface is coated with an anti-reflection film.

[0058] The second light input channel 12 comprises a two-channel rectangular aperture diaphragm 120 , a two-channel reflector 121 , and a two-channel field of view spectroscope 122 which are sequentially arranged along the light path.

[0059] The airglow light reaches the two-channel reflector 121 from the two-channel rectangular aperture diaphragm 120, is reflected by the two-channel reflector to the two-channel field of view spectroscope 122, and is reflected by the front surface of the two-channel field of view spectroscope to enter the front double telecentric mirror group 2.

[0060] The front surface of the two-channel field-of-view beam splitter 122 is coated with a reflective film, and the rear surface is coated with an anti-reflection film.

[0061] The incident light is deflected by the reflector and the beam splitter and enters the subsequent imaging components of the system. The one-channel field of view beam splitter 112 and the two-channel field of view beam splitter 122 are stacked up and down and orthogonal, such as Figure 2 shown.

[0062] The front double telecentric lens group 2 includes a front telecentric lens group 1 21, a field stop 22 located at the primary image plane, and a front telecentric lens group 23. The air glow light is emitted to the front telecentric lens group 1 21 through the orthogonal light inlet channel 1, and enters the front telecentric lens group 23 through the field stop 22. The air glow light enters the interference unit 3 through the front telecentric lens group 23.

[0063] The interference unit 3 includes a beam splitter prism 31 , a first field-of-view expanding prism 32 , a second field-of-view expanding prism 33 , a first echelle grating 34 and a second echelle grating 35 .

[0064] The first echelle grating 34 and the second echelle grating 35 have the same specification parameters, and the number of grating lines is 64 lp / mm.

[0065] The light outputted by the front double telecentric lens group 2 enters the beam splitter prism 31 , and the beam splitter prism 31 forms the incident light into a first light beam by transmission, and forms the incident light into a second light beam by reflection.

[0066] The first light beam passes through the first field-of-view expansion prism 32 and reaches the first echelle grating 34 to be diffracted and reflected. After being diffracted by the first echelle grating 34 , the first light beam passes through the first field-of-view expansion prism 32 and enters the beam splitter prism 31 again, and is reflected by the beam splitter prism 31 .

[0067] The second light beam passes through the second field-expanding prism 33 and reaches the second echelle grating 35 to be diffracted and reflected. After being diffracted by the second echelle grating 35 , the second light beam passes through the second field-expanding prism 33 and enters the beam splitter prism 31 again, and is transmitted through the beam splitter prism 31 .

[0068] The first light beam reflected by the beam splitter prism 31 and the second light beam transmitted by the beam splitter prism 31 are superimposed and interfered before entering the post-imaging unit 4. The two light beams enter the post-imaging unit 4 after being superimposed and interfered.

[0069] The post-imaging unit 4 comprises a projection lens group 40, a cylindrical lens group 41, a dichroic mirror 42, a filter 43 and a detector 44 located at the end of the optical path and used for imaging.

[0070] The projection lens group 40 is divided into a projection lens group 1 401 and a projection lens group 2 402 .

[0071] The cylindrical lens group 41 is divided into a one-channel cylindrical lens group 411 and a two-channel cylindrical lens group 412. The one-channel cylindrical lens group 411 and the two-channel cylindrical lens group 412 have the same specifications and parameters, are stacked up and down, and have optical power only in the vertical direction, such as Figure 3 The cylindrical lens group 41 is divided into two groups to ensure that the central fields of view of the two channels do not overlap. The one-channel cylindrical lens group 411 and the two-channel cylindrical lens group 412 each include five cylindrical lenses, and the vertical focal length of each lens group is 59 mm.

[0072] The dichroic mirror 42 is a wedge-shaped prism, and the angle between its front and rear surfaces is α, -1°≤α≤1°. The front surface of the dichroic mirror 42 is coated with a dichroic film that reflects 557.7nm light and transmits 630nm light, and the rear surface is coated with a reflective film that reflects 630nm light.

[0073] The filter 43 is used in partitions, including a filter partition 1 431 and a filter partition 2 432. Figure 4 The working wavelength of the first filter partition 431 is 557.7 nm, and the working wavelength of the second filter partition 432 is 630 nm.

[0074] A filter 43 is arranged in front of the detector, and the arrangement direction of the two partitions of the filter is orthogonal to the splicing direction of the two fields of view.

[0075] The light emitted from the beam splitter prism 31 passes through the projection lens group 1 401, the projection lens group 2 402, and the cylindrical lens group 41 and is incident on the dichroic mirror 42. The 557.7nm gas glow light is reflected by the front surface of the dichroic mirror, passes through the filter 43 and is imaged on the detector 44; the 630nm gas glow light is reflected by the rear surface of the dichroic mirror, passes through the filter 43 and is finally imaged on the detector 44.

[0076] The gas glow light entering the system through the light input channel 11 eventually passes through the projection lens group 40, passes through the channel cylindrical lens group 411, passes through the filter 43, and is imaged on the detector 44, thereby generating a first interference pattern 441 and a third interference pattern 443.

[0077] The gas glow light entering the system through the second light input channel 12 finally enters the two-channel cylindrical lens group 412 through the projection lens group 40, passes through the filter 43, is imaged on the detector 44, and generates the second interference pattern 442 and the fourth interference pattern 444.

[0078] like Figure 5 The first interference fringe pattern 441 is the interference fringe pattern formed on the detector by the light signal with a wavelength of 557.7nm in the first field of view, the second interference fringe pattern 442 is the interference fringe pattern formed on the detector by the light signal with a wavelength of 557.7nm in the second field of view, the third interference fringe pattern 443 is the interference fringe pattern formed on the detector by the light signal with a wavelength of 630nm in the first field of view, and the fourth interference fringe pattern 444 is the interference fringe pattern formed on the detector by the light signal with a wavelength of 630nm in the second field of view.

[0079] The calibration unit 5 includes a calibration light source 50 and a collimator 51; the calibration unit 5 can effectively remove phase drift errors through phase tracking;

[0080] The light emitted by the calibration light source 50 is straightened by the collimator 51 and then enters the front telecentric lens group 2; the output light first passes through the one-channel field of view beam splitter 121 and the two-channel field of view beam splitter 122 at the same time to enter the front telecentric lens group 1 21, then passes through the field of view aperture 23 and the front telecentric lens group 22, exits the telecentric lens group 2, and then passes through the interference unit 3 and the rear imaging unit 4 in sequence to finally form an image.

Claims

1. The dual-field-of-view dual-band atmospheric wind field measurement Doppler differential interferometer optical system is characterized by: It comprises an orthogonal light input channel (1), a front double telecentric mirror group (2), an interference unit (3), a rear imaging unit (4) and a calibration unit (5); The gas glow light enters the interference unit (3) through the orthogonal light inlet channel (1) and the front double telecentric lens group (2) to form interference fringes and is imaged by the rear imaging unit (4); The light emitted by the calibration unit (5) enters the front telecentric lens group (2), and then passes through the interference unit (3) and the rear imaging unit (4) in sequence to finally form an image.

2. The dual-field-of-view dual-band atmospheric wind field measurement Doppler differential interferometer optical system according to claim 1, characterized in that: The orthogonal light input channel (1) is divided into a first light input channel (11) and a second light input channel (12), and the first light input channel (11) and the second light input channel (12) are two orthogonal field of view light input channels at the same atmospheric altitude; The light inlet channel (11) comprises a channel rectangular aperture diaphragm (110), a channel reflector (111) and a channel field of view spectroscope (112) which are sequentially arranged along the light path; the front surface of the channel field of view spectroscope (112) is coated with a reflective film, and the rear surface is coated with an anti-reflection film; The airglow light enters a light-entering channel rectangular aperture diaphragm (110) and reaches a channel reflector (111), is reflected by the channel reflector to a channel field of view beam splitter (112), and is reflected by the front surface of the channel field of view beam splitter (112) to enter a front double telecentric mirror assembly (2); The two light entry channels (12) comprise a two-channel rectangular aperture diaphragm (120), a two-channel reflector (121), and a two-channel field of view spectroscope (122) which are sequentially arranged along the light path; the front surface of the two-channel field of view spectroscope (122) is coated with a reflective film, and the rear surface is coated with an anti-reflection film; the one-channel field of view spectroscope (112) and the two-channel field of view spectroscope (122) are stacked up and placed orthogonally; The airglow light reaches the two-channel reflector (121) from the two-channel rectangular aperture diaphragm (120) for light entry, is reflected by the two-channel reflector to the two-channel field of view spectroscope (122), and is reflected by the front surface of the two-channel field of view spectroscope to enter the front double telecentric mirror group (2).

3. The dual-field-of-view dual-band atmospheric wind field measurement Doppler differential interferometer optical system according to claim 1, characterized in that: The front double telecentric mirror group (2) comprises a front telecentric first mirror group (21), a field diaphragm (22) located at a primary image plane, and a front telecentric second mirror group (23); the air glow light is emitted to the front telecentric first mirror group (21) through an orthogonal light inlet channel (1), enters the front telecentric second mirror group (23) through the field diaphragm (22), and the air glow light is then incident on the interference unit (3) through the front telecentric second mirror group (23).

4. The dual-field-of-view dual-band atmospheric wind field measurement Doppler differential interferometer optical system according to claim 1, characterized in that: The interference unit (3) comprises a beam splitter prism (31), a first field-of-view expanding prism (32), a second field-of-view expanding prism (33), a first echelle grating (34) and a second echelle grating (35); The first echelle grating (34) and the second echelle grating (35) have the same specification parameters, and the number of grating lines is 64 lp / mm; The light output by the front double telecentric lens group (2) enters the beam splitter prism (31), and the beam splitter prism (31) forms the incident light into a first light beam by transmission and forms the incident light into a second light beam by reflection; The first light beam passes through the first field-expanding prism (32) and reaches the first echelle grating (34) to be diffracted and reflected. After being diffracted by the first echelle grating (34), the first light beam passes through the first field-expanding prism (32) and enters the beam splitting prism (31) again, and is reflected by the beam splitting prism (31). The second light beam passes through the second field-expanding prism (33) and reaches the second echelle grating (35) to be diffracted and reflected. After being diffracted by the second echelle grating (35), the second light beam passes through the second field-expanding prism (33) and enters the beam splitting prism (31) again, and is transmitted through the beam splitting prism (31). The first light beam reflected by the beam splitter prism (31) and the second light beam transmitted by the beam splitter prism (31) are superimposed and interfered before entering the post-imaging unit (4); the two light beams enter the post-imaging unit (4) after the superimposition and interference.

5. The dual-field-of-view dual-band atmospheric wind field measurement Doppler differential interferometer optical system according to claim 1, characterized in that: The post-imaging unit (4) comprises, in sequence, a projection lens group (40), a cylindrical lens group (41), a dichroic mirror (42), a filter (43) and a detector (44); The projection lens group (40) is divided into a projection lens group 1 (401) and a projection lens group 2 (402); The cylindrical mirror group (41) is divided into a one-channel cylindrical mirror group (411) and a two-channel cylindrical mirror group (412). The one-channel cylindrical mirror group (411) and the two-channel cylindrical mirror group (412) have the same specification parameters, are stacked up and down, and have optical power only in the vertical direction. The one-channel cylindrical mirror group (411) and the two-channel cylindrical mirror group (412) each include five cylindrical mirrors coaxially arranged in sequence, and the focal length of each mirror group in the vertical direction is 59 mm; The dichroic mirror (42) is a wedge-shaped prism, and the angle between the front surface and the rear surface is α, -1°≤α≤1°; the front surface of the dichroic mirror (42) is coated with a color separation film that reflects the wavelength of 557.7nm light and transmits the wavelength of 630nm light, and the rear surface is coated with a reflection film that reflects the wavelength of 630nm light; The optical filter (43) is used in partitions, including a first filter partition (431) and a second filter partition (432), the working wavelength of the first filter partition (431) is 557.7 nm, and the working wavelength of the second filter partition (432) is 630 nm; A filter (43) is arranged in front of the detector (44), and the arrangement direction of two partitions of the filter (43) is orthogonal to the dual-field splicing direction; Light emitted from the beam splitter prism (31) passes through a projection lens group 1 (401), a projection lens group 2 (402), and a cylindrical lens group (41) and is incident on a dichroic mirror (42); 557.7 nm gas glow light is reflected by the front surface of the dichroic mirror (42), passes through a filter (43), and is imaged onto a detector (44); and 630 nm gas glow light is reflected by the rear surface of the dichroic mirror (42), passes through a filter (43), and is finally imaged onto a detector (44).

6. The dual-field-of-view dual-band atmospheric wind field measurement Doppler differential interferometer optical system according to claim 5, characterized in that: The gas glow light entering the system through the first light inlet channel (11) eventually passes through the projection lens group (40) and the first channel cylindrical lens group (411), and is imaged on the detector (44) through the filter (43), and a first interference pattern (441) and a third interference pattern (443) are generated; The gas glow light entering the system through the second light input channel (12) finally enters the two-channel cylindrical lens group (412) through the projection lens group (40), is imaged on the detector (44) through the filter (43), and generates a second interference pattern (442) and a fourth interference pattern (444); The first interference fringe pattern (441) is an interference fringe pattern formed on the detector by the light signal of the first field of view with a wavelength of 557.7 nm, the second interference fringe pattern (442) is an interference fringe pattern formed on the detector by the light signal of the second field of view with a wavelength of 557.7 nm, the third interference fringe pattern (443) is an interference fringe pattern formed on the detector by the light signal of the first field of view with a wavelength of 630 nm, and the fourth interference fringe pattern (444) is an interference fringe pattern formed on the detector by the light signal of the second field of view with a wavelength of 630 nm.

7. The dual-field-of-view dual-band atmospheric wind field measurement Doppler differential interferometer optical system according to claim 1, characterized in that: The calibration unit (5) comprises a calibration light source (50) and a collimator (51); the calibration unit (5) can effectively remove phase drift errors through phase tracking; Light emitted by the calibration light source (50) is collimated by a collimator (51) and then enters a front telecentric mirror group (2); the emitted light first passes through a one-channel field of view beam splitter (121) and a two-channel field of view beam splitter (122) at the same time and enters a front telecentric mirror group (21), then passes through a field of view diaphragm (23) and a front telecentric mirror group (22), exits the telecentric mirror group (2), and then passes through an interference unit (3) and a rear imaging unit (4) in sequence to finally form an image.

Images