CN212748972U - Double-view-field near-infrared Doppler differential interferometer - Google Patents
Double-view-field near-infrared Doppler differential interferometer Download PDFInfo
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Abstract
The utility model provides a near-infrared Doppler difference interferometer of double-view field solves and surveys two direction wind fields on 60 ~ 80km stratosphere simultaneously, has the great, the higher problem of cost of volume. The interferometer comprises a double-view-field front imaging coupling system, an interferometer, a fringe imaging lens and a detector which are sequentially arranged along a light path; the double-view-field front-mounted imaging coupling system is an image space telecentric system with a middle image surface, the F number of the double-view-field front-mounted imaging coupling system is 15, and the double-view-field front-mounted imaging coupling system comprises a first front-mounted subsystem, a second front-mounted subsystem and a front-mounted coupling system shared by emergent rays of the first front-mounted subsystem and the second front-mounted subsystem; the first prepositive subsystem and the second prepositive subsystem introduce incident light rays of two mutually perpendicular fields into the prepositive coupling system, and form interference fringes of two fields on a target surface of a detector after passing through an interferometer and a fringe imaging lens; the fringe imaging lens is a finite conjugate distance imaging system with telecentric object space and telecentric image space, the paraxial magnification is-0.3, and the F number is 4.5.
Description
Technical Field
The utility model relates to a spectral detection technique, concretely relates to near-infrared Doppler difference interferometer of two visual fields.
Background
The traditional atmospheric wind field detection technology mainly comprises a Fabry-Perot interference wind field detection technology and a wide-angle Michelson interferometer wind field detection technology, wherein the Fabry-Perot interference wind field detection technology has the characteristics of high resolution and high sensitivity, but the requirements on processing, assembly and adjustment precision are very high; the latter requires an optical path difference scanning device and can only detect one spectral line at a time. The Doppler differential interference technology is a novel fine spectrum detection technology and has the advantages of high spectral resolution, high flux, high stability and the like.
The target source of the traditional atmospheric wind field detection technology is a high-rise atmospheric airglow located in a visible light waveband of 80-300 km. For 60-80 km stratosphere, researches show that oxygen molecules have high spectral line intensity near 867 mu m of near-infrared band and good separability, and can be used as target spectral lines. According to the Doppler effect, the central frequency of a spectral line obtained by an interferometer is shifted by an atmospheric wind field, and the shift amount has a quantitative relation with the movement speed of the atmosphere. Therefore, for the detection of 60-80 km stratosphere wind fields, selecting an airglow spectral line of the oxygen at 867nm as a target source for wind field detection, detecting by adopting a Doppler difference interferometer, and calculating the movement speed of the atmosphere of the 60-80 km stratosphere by inverting the Doppler frequency shift quantity of the 867nm airglow spectral line. Because the inversion of the wind speed vector needs the vector synthesis of the wind speeds in two directions, the atmospheric wind fields in two directions need to be detected, the existing Doppler differential interferometer can only realize the atmospheric wind field detection in one direction, and if the atmospheric wind fields in two directions are detected simultaneously, the two Doppler differential interferometers need to be used for simultaneous detection, so that the whole equipment has a large volume and high cost.
SUMMERY OF THE UTILITY MODEL
In order to solve simultaneously to survey the wind field of two directions on 60 ~ 80km stratosphere, there is the technical problem that equipment volume is great, the cost is higher, the utility model provides a near-infrared Doppler difference interferometer of double-field of view can realize surveying the atmosphere wind field on two mutually perpendicular azimuths 60 ~ 80km stratosphere simultaneously.
In order to achieve the above purpose, the utility model provides a technical scheme is:
a dual-field near-infrared Doppler differential interferometer is characterized in that: the system comprises a double-view-field front-mounted imaging coupling system, an interferometer, a fringe imaging lens and a detector which are sequentially arranged along a light path;
the double-view-field front-mounted imaging coupling system is an image space telecentric system with a middle image surface, the F number of the double-view-field front-mounted imaging coupling system is 15, and the double-view-field front-mounted imaging coupling system comprises a first front-mounted subsystem, a second front-mounted subsystem and a front-mounted coupling system shared by emergent rays of the first front-mounted subsystem and the second front-mounted subsystem;
the first prepositive subsystem and the second prepositive subsystem introduce incident light rays of two mutually perpendicular fields into the prepositive coupling system, and form interference fringes of two fields on a target surface of a detector after sequentially passing through an interferometer and a fringe imaging lens;
the first preposed subsystem comprises a first aperture diaphragm, a first preposed lens group, a first plane reflector and a second plane reflector which are sequentially arranged along a first light path;
the second preposed subsystem comprises a second aperture diaphragm, a second preposed lens group, a third plane reflector and a fourth plane reflector which are sequentially arranged along a second light path;
incident light rays of the first light path and the second light path are respectively positioned in two view field directions which face to each other and are vertical to each other; the normal directions of the first plane reflector and the third plane reflector are mutually vertical; the second plane reflector and the fourth plane reflector are arranged in parallel and staggered with each other along the axial direction and the radial direction of the reflectors, so that emergent rays of the second plane reflector and the fourth plane reflector are staggered with each other, and reflected rays of the second plane reflector and the fourth plane reflector are simultaneously incident to the front coupling system;
the front coupling system comprises a third front lens group, a Lyot diaphragm, a fifth plane mirror, a sixth plane mirror, a fourth front lens group, a seventh plane mirror and an optical filter which are sequentially arranged along an optical path;
the interferometer is used for generating interference fringes from incident light rays in two view field directions and irradiating the interference fringes to the fringe imaging lens;
the fringe imaging lens is a finite conjugate distance imaging system with telecentric object space and telecentric image space, the paraxial magnification of the finite conjugate distance imaging system is-0.3, the F number of the finite conjugate distance imaging system is 4.5, and the finite conjugate distance imaging lens comprises a first fringe imaging lens, a second fringe imaging lens, a third fringe imaging lens, a fourth fringe imaging lens and a fifth fringe imaging lens which are coaxially arranged along a light path in sequence.
Furthermore, the first front lens group, the second front lens group, the third front lens group and the fourth front lens group are double cemented lens groups, and cemented lens materials of the double cemented lens groups are respectively H-F4 and H-ZLAF 68B.
Furthermore, the riot diaphragm is located on the primary image surfaces of the first aperture diaphragm and the second aperture diaphragm, and the size of the riot diaphragm is smaller than the aperture of the light at the position of the riot diaphragm.
Further, the optical power of the optical filter is zero, the optical filter is made of JGS1, the central wavelength is 866.8nm, and the full width at half maximum FWHM of the bandwidth is 1 nm.
Furthermore, the interferometer comprises incident window glass, a first beam splitter prism, a second beam splitter prism, a first field widening prism, a second field widening prism, a first blazed grating, a second blazed grating and emergent window glass; the first field widening prism and the first blazed grating form a first optical unit, the second field widening prism and the second blazed grating form a second optical unit, and the first beam splitter prism and the second beam splitter prism form a beam splitting unit.
Furthermore, the materials of the incident window glass and the exit window glass are both D-ZF93, and the focal power is 0;
the first light splitting prism and the second light splitting prism respectively comprise two isosceles right-angle prisms, and the right-angle prisms are made of JGS 1; the inclined planes of the two right-angle prisms are glued surfaces, and the glued surfaces are plated with semi-transparent semi-reflective films.
Further, the first field widening prism and the second field widening prism are both prisms with trapezoidal bottom surfaces, and the material of the first field widening prism and the second field widening prism is N-SF 57;
the blazed angles of the first blazed grating and the second blazed grating are both 10 degrees, the groove density is 400 line pairs/mm, and the grating substrates are all JGS 1.
Furthermore, the first stripe imaging mirror, the second stripe imaging mirror, the third stripe imaging mirror, the fourth stripe imaging mirror and the fifth stripe imaging mirror are all made of H-ZLAF 68B;
further, the first fringe imaging lens, the fourth fringe imaging lens and the fifth fringe imaging lens are all biconvex positive lenses;
the second striation imaging mirror is a positive lens with a concave surface facing to the diaphragm;
the third stripe imaging mirror is a negative lens with a concave surface facing the diaphragm.
Compared with the prior art, the utility model has the advantages that:
1. the utility model discloses the interferometer is through leading imaging coupled system of two visual fields in introducing leading coupled system with two incident visual field directions light of mutually perpendicular to behind interferometer, fringe imaging lens, form the interference fringe of two visual fields at the detector target surface, adopt single the utility model discloses an interferometer can realize surveying the atmosphere wind field on two mutually perpendicular azimuths 60 ~ 80km stratosphere simultaneously, has characteristics small, with low costs
2. The utility model discloses the interferometer has realized the application of entity formula Doppler difference interferometer at near infrared wave band, through the design to leading formation of image coupled system of two visual fields, interferometer and fringe imaging lens, and the emulation interference fringe that interferometer optical system obtained in operating band has higher modulation degree, can satisfy the required precision of 60 ~ 80km atmospheric wind speed inversion.
3. The utility model discloses a while is surveyed two mutually perpendicular's visual field targets, adopts the mode of speculum coupling to carry out the design of two visual field couplings, in order to realize two visual field coupling functions, has carried out the design of twice optical aperture to the leading imaging coupling system in two visual fields, carries out the design of twice visual field to stripe image forming lens for the aperture and the visual field of two visual field near-infrared Doppler difference interferometers satisfy the demand of two visual field couplings.
4. The utility model discloses leading formation of image coupled system in interferometer two visual fields is image space heart telecentric, stripe imaging lens is the two heart telecentric designs of object space heart telecentric and image space heart telecentric, adopts the mode of heart telecentric to improve wind speed inversion accuracy, effectively improves the relative illuminance of image plane department, makes the illuminance on image plane keep even to improve the contrast of interferogram, and then promoted the precision of wind speed inversion.
5. The utility model discloses the interferometer utilizes the material combination of different linear expansion coefficients, reduces the sensitivity of interferometer basis optical path difference along with temperature variation, pairs according to the combination of optical glass linear expansion coefficient, confirms that the combination of the first optical unit of entity interferometer, second optical unit pairs and the size value to improve interferometer temperature stability.
Drawings
FIG. 1 is a schematic diagram of an optical path structure of a dual-field-of-view near-infrared Doppler differential interferometer according to an embodiment;
FIG. 2a is a top view of an embodiment dual field of view near infrared Doppler differential interferometer;
FIG. 2b is a rear view of an embodiment dual field of view near infrared Doppler differential interferometer;
FIG. 2c is a right side view of an embodiment dual field of view near infrared Doppler differential interferometer;
FIG. 3 is a MTF curve of a fringe imaging lens at the Nyquist frequency at normal temperature and pressure;
FIG. 4a is an interference fringe simulated by the dual field-of-view near infrared Doppler differential interferometer of the embodiment;
FIG. 4b is the radiance of the interference fringe of FIG. 4 a;
FIG. 5 is a modulation degree calculated by a simulated interference fringe of the dual-field near-infrared Doppler difference interferometer according to the embodiment;
the reference numbers in the figures are:
111-a first aperture diaphragm, 112-a first front lens group, 113-a first plane mirror, 114-a second plane mirror;
121-a second aperture diaphragm, 122-a second front lens group, 123-a third plane mirror, 124-a fourth plane mirror;
131-a third front lens group, 132-a Lyot diaphragm, 133-a fifth plane mirror, 134-a sixth plane mirror, 135-a fourth front lens group, 136-a seventh plane mirror and 137-a light filter;
201-incident window glass, 202-first beam splitter prism, 203-second beam splitter prism, 204-first field widening prism, 205-second field widening prism, 206-first blazed grating, 207-second blazed grating and 208-emergent window glass;
301-a first fringe imaging mirror, 302-a second fringe imaging mirror, 303-a third fringe imaging mirror, 304-a fourth fringe imaging mirror, 305-a fifth fringe imaging mirror;
4-detector.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments.
As shown in fig. 1, 2a, 2b and 2c, a dual-field near-infrared doppler difference interferometer includes a dual-field pre-imaging coupling system, an interferometer, a fringe imaging lens and a detector 4. Parallel light rays from two mutually perpendicular fields sequentially pass through the double-field-of-view pre-imaging coupling system, the interferometer and the fringe imaging lens, and then form interference fringes on a focal plane of the detector 4. The double-view-field near-infrared Doppler differential interferometer can be used for detecting atmospheric wind fields in two directions perpendicular to each other on 60-80 km stratosphere.
The double-view-field front-end imaging coupling system is provided with plane reflectors with mutually perpendicular normal directions in two mutually perpendicular view field directions, light rays of the two mutually perpendicular view fields are introduced into a main optical axis of the system, coupling is carried out at a primary image surface of the double-view-field front-end imaging coupling system, the primary image surface is divided into an upper half area and a lower half area, and target light rays with 90-degree phase angle difference are received. The double-view-field front-mounted imaging coupling system is an image space telecentric system with a middle image surface, the F number is 15, the double-view-field front-mounted imaging coupling system comprises a first front-mounted subsystem, a second front-mounted subsystem and a front-mounted coupling system shared by emergent rays of the first front-mounted subsystem and the second front-mounted subsystem, and the first front-mounted subsystem comprises a first aperture diaphragm 111, a first front lens group 112, a first plane reflector 113 and a second plane reflector 114 which are sequentially arranged along a first light path; the second preposed subsystem comprises a second aperture diaphragm 121, a second preposed lens group 122, a third plane reflector 123 and a fourth plane reflector 124 which are sequentially arranged along a second light path, the incident view field directions of the first preposed subsystem and the second preposed subsystem are mutually vertical, the first aperture diaphragm 111, the first preposed lens group 112 of the first preposed subsystem and the second aperture diaphragm 121 and the second preposed lens group 122 of the second preposed subsystem are respectively positioned in two light beam incident directions which face mutually vertical, namely the incident light rays of the first light path and the second light path are respectively positioned in two view field directions which face mutually vertical; the normal directions of the first plane mirror 113 and the third plane mirror 123 are perpendicular to each other, the second plane mirror 114 and the fourth plane mirror 124 are arranged in parallel and staggered with each other along the axial direction and the radial direction of the mirrors, so that the emergent light rays of the second plane mirror 114 and the fourth plane mirror 124 are staggered with each other, the light rays of two fields of view are introduced into the main optical axis of the pre-coupling system by the second plane mirror 114 and the fourth plane mirror 124, and the reflected light rays of the second plane mirror 114 and the fourth plane mirror 124 are incident into the pre-coupling system at the same time.
The first plane mirror 113, the second plane mirror 114, the third plane mirror 123, the fourth plane mirror 124, and the fifth plane mirror 133 have no optical power, and function to fold the optical path.
The first front lens group 112 and the second front lens group 122 respectively image the infinite light rays on a primary image plane. The light enters the pre-coupling system after the primary image plane, and the pre-coupling system comprises a third pre-mirror group 131, a rio diaphragm 132, a fifth plane mirror 133, a sixth plane mirror 134, a fourth pre-mirror group 135, a seventh plane mirror 136 and a light filter 137 which are sequentially arranged along an optical axis; the third front lens group 131 and the fourth front lens group 135 re-image the image on the primary image plane on the first blazed grating and the second blazed grating of the interferometer.
The first front lens set 112, the second front lens set 122, the third front lens set 131 and the fourth front lens set 135 are double cemented lens sets, cemented lens materials of the double cemented lens sets are respectively H-F4 and H-ZLAF68B, the third front lens set 131 and the fourth front lens set 135 form a finite conjugate distance imaging system, and an object plane of the imaging system is located at an image plane of the first front lens set 112 (the second front lens set 122); the image of the first aperture stop (second aperture stop) is imaged between the third front mirror group 131 and the fourth front mirror group 135 after passing through the first front mirror group 112 (second front mirror group 122) and the third front mirror group 131, the rio stop 132 is located between the third front mirror group 131 and the fifth plane mirror 133 and located at the middle image plane of the pupil, the size of the rio stop 132 is slightly smaller than the aperture of the light at this position, and the rio stop 132 is placed at this position to eliminate stray light. The optical power of the optical filter 137 is zero, the optical filter is made of JGS1, the central wavelength is 866.8nm, the bandwidth FWHM is 1nm, and the optical filter 137 is the last lens of the dual-field-of-view front-end imaging coupling system and is located in front of the image plane.
The interferometer comprises incident window glass 201, emergent window glass 208, a first beam splitter prism 202, a second beam splitter prism 203, a first field widening prism 204, a second field widening prism 205, a first blazed grating 206 and a second blazed grating 207, wherein the incident window glass 201 and the emergent window glass 208 are made of D-ZF93, and the focal power is 0; the first beam splitter prism 202 and the second beam splitter prism 203 are isosceles right-angle prisms made of JGS1, the two right-angle prisms are formed by gluing along inclined planes, and the glued surfaces are used as splitting surfaces and plated with semi-transparent and semi-reflective films; the first field widening prism 204 and the second field widening prism 205 are two prisms with trapezoidal bottom surfaces, and are made of N-SF 57; the blaze angle of the first blazed grating 206 and the second blazed grating 207 is 10 °, and the scribe line density is 400 line pairs/mm; the first field widening prism 204 and the first blazed grating 206 form a first optical unit, and the second field widening prism 205 and the second blazed grating 207 form a second optical unit; the first beam splitter prism 202 and the second beam splitter prism 203 form a beam splitting unit, and the first optical unit and the second optical unit are respectively positioned in two emergent light paths of the beam splitting unit;
the light beam is incident on the splitting prism through the incident window glass 201 and then split into two beams through the splitting surface, the two beams enter the first field broadening prism 204 and the first blazed grating 206 to form a first optical unit, the second field broadening prism 205 and the second blazed grating 207 to form a second optical unit, and the two beams are combined through the splitting surface and then emitted out through the emergent window glass 208.
The fringe imaging lens is a finite conjugate distance imaging system with telecentric object space and telecentric image space, the paraxial magnification of the finite conjugate distance imaging system is-0.3, the F number of the finite conjugate distance imaging system is 4.5, a first fringe imaging lens 301, a second fringe imaging lens 302, a third fringe imaging lens 303, a fourth fringe imaging lens 304 and a fifth fringe imaging lens 305 are sequentially arranged along the optical axis, and the materials of the finite conjugate distance imaging system are H-ZLAF 68B. The stripe imaging lens images the secondary image surface at the blazed grating onto the target surface of the detector 4.
The working process of the interferometer of the embodiment is as follows: parallel light rays from two mutually perpendicular fields of view respectively pass through the first front lens group 112 and the second front lens group 122 and then are respectively imaged on a primary image surface of the double-field-of-view front imaging coupling system; the two field-of-view light beams are coupled in the main light path in a staggered manner in the field-of-view direction after passing through the two plane mirrors respectively, the image of the primary image plane is imaged after passing through the third front lens group 131 and the fourth front lens group 135, and the two paths of light beams are imaged at the first blazed grating and the second blazed grating of the interferometer respectively; and extracts the radiation intensity information of the target spectral line via the optical filter 137; after light is split by the interferometer, interference fringes are formed at the blazed grating by the light of the two arms; after conjugate imaging by the fringe imaging mirror, the interference fringe is imaged on the focal plane of the detector 4. And obtaining the atmospheric wind speed information by performing data inversion on the interference fringes.
The specific structural parameters of the dual-field near-infrared doppler difference interferometer of the present embodiment are detailed in the following table.
The second front lens group 122 has the same structural parameters as the first front lens group 112.
In the optical system of the dual-field near-infrared Doppler differential interferometer of the embodiment, the F number is 4.5, the field angle is a rectangular field of view 0.84 degrees multiplied by 2.56 degrees, and the image plane size of each field of view is 5.096mm multiplied by 13.312 mm.
Referring to fig. 3, the MTF curve of the fringe imaging lens is close to the diffraction limit, and meets the image quality requirement.
Referring to fig. 4a, 4b and 5, the interference fringes and the modulation degrees of the interference fringes obtained by full-system simulation of the dual-field-of-view long-wave infrared doppler difference interferometer are all greater than 99%.
To sum up, the utility model discloses an optical design to leading formation of image coupled system of double-view field, interferometer, fringe imaging lens has realized the survey of the atmospheric wind field wind speed vector to the 60 ~ 80 km's of two field of view directions of mutually perpendicular's stratosphere, and the interference fringe modulation degree that the emulation obtained can satisfy the required precision of data inversion, provides the calculation simulation model for subsequent atmospheric wind speed inversion.
The above description is only for the preferred embodiment of the present invention, and the technical solution of the present invention is not limited thereto, and any known modifications made by those skilled in the art on the basis of the main technical idea of the present invention belong to the technical scope to be protected by the present invention.
Claims (9)
1. The utility model provides a near-infrared Doppler difference interferometer of two visual fields which characterized in that: the system comprises a double-view-field front-mounted imaging coupling system, an interferometer, a fringe imaging lens and a detector (4) which are sequentially arranged along a light path;
the double-view-field front-mounted imaging coupling system is an image space telecentric system with a middle image surface, the F number is 15, and the double-view-field front-mounted imaging coupling system comprises a first front-mounted subsystem, a second front-mounted subsystem and a front-mounted coupling system shared by emergent rays of the first front-mounted subsystem and the second front-mounted subsystem;
the first prepositive subsystem and the second prepositive subsystem introduce incident light rays of two mutually perpendicular view fields into the prepositive coupling system, and form interference fringes of two view fields on a target surface of a detector (4) after sequentially passing through an interferometer and a fringe imaging lens;
the first front-mounted subsystem comprises a first aperture diaphragm (111), a first front-mounted mirror group (112), a first plane reflector (113) and a second plane reflector (114) which are sequentially arranged along a first light path;
the second preposed subsystem comprises a second aperture diaphragm (121), a second preposed lens group (122), a third plane reflector (123) and a fourth plane reflector (124) which are sequentially arranged along a second light path;
incident light rays of the first light path and the second light path are respectively positioned in two view field directions which face to each other and are vertical to each other; the normal directions of the first plane reflector (113) and the third plane reflector (123) are vertical to each other; the second plane reflector (114) and the fourth plane reflector (124) are arranged in parallel and staggered with each other along the axial direction and the radial direction of the reflectors, so that emergent rays of the second plane reflector (114) and the fourth plane reflector (124) are staggered with each other, and reflected rays of the second plane reflector (114) and the fourth plane reflector (124) are simultaneously incident to the pre-coupling system;
the front coupling system comprises a third front lens group (131), a Rio diaphragm (132), a fifth plane mirror (133), a sixth plane mirror (134), a fourth front lens group (135), a seventh plane mirror (136) and an optical filter (137) which are sequentially arranged along a light path;
the interferometer is used for generating interference fringes from incident light rays in two view field directions and irradiating the interference fringes to the fringe imaging lens;
the fringe imaging lens is a finite conjugate distance imaging system with telecentric object space and telecentric image space, the paraxial magnification is-0.3, the F number is 4.5, and the fringe imaging lens comprises a first fringe imaging lens (301), a second fringe imaging lens (302), a third fringe imaging lens (303), a fourth fringe imaging lens (304) and a fifth fringe imaging lens (305) which are coaxially arranged along a light path in sequence.
2. The dual field of view near infrared doppler differential interferometer of claim 1, wherein: the first front lens group (112), the second front lens group (122), the third front lens group (131) and the fourth front lens group (135) are double cemented lens groups, and cemented lens materials of the double cemented lens groups are respectively H-F4 and H-ZLAF 68B.
3. The dual field of view near infrared doppler differential interferometer of claim 2, wherein: the optical power of the optical filter (137) is zero, the optical filter is made of JGS1, the center wavelength is 866.8nm, and the full width at half maximum FWHM of the bandwidth is 1 nm.
4. The dual field-of-view near-infrared doppler differential interferometer of claim 3, wherein: the Rio diaphragm (132) is positioned on the primary image surfaces of the first aperture diaphragm (111) and the second aperture diaphragm (121), and the size of the Rio diaphragm is smaller than the aperture of the light at the position of the Rio diaphragm.
5. The dual field of view near infrared doppler difference interferometer of any of claims 1 to 4, wherein: the interferometer comprises incident window glass (201), a first beam splitter prism (202), a second beam splitter prism (203), a first field widening prism (204), a second field widening prism (205), a first blazed grating (206), a second blazed grating (207) and emergent window glass (208); the first field widening prism (204) and the first blazed grating (206) form a first optical unit, the second field widening prism (205) and the second blazed grating (207) form a second optical unit, and the first beam splitting prism (202) and the second beam splitting prism (203) form a beam splitting unit.
6. The dual field-of-view near-infrared doppler differential interferometer of claim 5, wherein: the material of the incident window glass (201) and the material of the exit window glass (208) are both D-ZF93, and the focal power is 0;
the first light splitting prism (202) and the second light splitting prism (203) both comprise two isosceles right-angle prisms made of JGS 1; the inclined planes of the two right-angle prisms are glued surfaces, and the glued surfaces are plated with semi-transparent semi-reflective films.
7. The dual field-of-view near-infrared doppler differential interferometer of claim 6, wherein: the first field widening prism (204) and the second field widening prism (205) are both prisms with trapezoidal bottom surfaces and are made of N-SF 57;
the blazed angles of the first blazed grating (206) and the second blazed grating (207) are both 10 degrees, the groove densities are both 400 line pairs/mm, and the grating substrates are both JGS 1.
8. The dual field of view near infrared doppler differential interferometer of claim 1, wherein: the materials of the first stripe imaging mirror (301), the second stripe imaging mirror (302), the third stripe imaging mirror (303), the fourth stripe imaging mirror (304) and the fifth stripe imaging mirror (305) are all H-ZLAF 68B.
9. The dual field-of-view near-infrared doppler differential interferometer of claim 8, wherein: the first stripe imaging lens (301), the fourth stripe imaging lens (304) and the fifth stripe imaging lens (305) are all biconvex positive lenses;
the second striation imaging mirror (302) is a positive lens with a concave surface facing to the diaphragm;
the third stripe imaging lens (303) is a negative lens with a concave surface facing to the diaphragm.
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