CN100443869C - High-stability high-spectral-resolution interference imaging spectrometer imaging method and spectrometer - Google Patents
High-stability high-spectral-resolution interference imaging spectrometer imaging method and spectrometer Download PDFInfo
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Abstract
An imaging method of interference imaging spectrometer with high stability and high spectral resolution and a spectrometer for realizing the method are disclosed, which convert the target light into parallel beams, and divide the parallel beams into reflected beams and transmitted beams through a beam splitter. The reflected beam is reflected by the turning mirror and the corner reflector and then returns to the beam splitter, and is converged by the Fourier lens to form a first optical path. The transmitted light beam returns to the beam splitter after being reflected by the corner reflector and the plane reflector, and is converged by the Fourier lens to form a second light optical path, and an optical path difference is generated when the two light beams reach the detector. The corner reflector moves synchronously along a plane vertical to the beam splitter, the optical path difference range of the two beams of light changes, and after interference spectrograms corresponding to different optical path difference ranges are superposed, a target restoration image with high spectral resolution is obtained through Fourier transformation. The invention solves the technical problems that the background technology can only sample single pixel, or the system has complex structure and poor stability, etc., has good real-time performance and is particularly suitable for large-area scanning of large targets.
Description
Technical Field
The invention relates to a moving mirror type interference imaging method for quickly obtaining a target interference spectrum and a spectrometer for realizing the method, in particular to an imaging method of an interference imaging spectrometer with high stability and high spectral resolution and a spectrometer for realizing the method.
Background
Earlier imaging spectrometers have a division of french space and strategic systems in the michelson interferometric time-modulated space imaging Fourier transform spectrometer developed in 1991 [ D simmenoni. new concept for high-compact Imaging Fourier Transform (IFTS) [ C ] SPIE, 1991, 1479: 127. 138.), michelson interferometric time-modulated spatial imaging Fourier transform spectrometer developed by lorentzian moll laboratories in 1995 [ Michael R Carter, Charles LBennctt, DavidJ Fields, et al, live more imaging Fourier transform spectrometer [ C ]. SPIE, 1995, 2480: 380-386 ]. The linear reciprocating scanning mode is adopted, steering is required when scanning is finished every time, and data are acquired after the data are stabilized. Therefore, a corresponding coherent sampling pattern must be provided by a reference laser beam when data is acquired. The scanning speed is controlled by a servo system and provides a flyback scan in the steering, and as the scanning frequency and speed increase, the round trip time becomes an important part of the total scanning time. The bandwidth required by the servo system increases dramatically in order to obtain an accurate sampled interferogram. As the scanning speed increases, the resolution is limited by the above factors. Since the round trip time becomes a significant portion of the total scan time, the duty cycle is reduced due to constraints on servo system power, scan device size, scan device weight, and system settling time. For example, it is extremely difficult to achieve a reciprocating scan at a scan frequency of 360 scans/second with a single scan time of 2.8 milliseconds. 1-2 milliseconds of return and settling time will reduce the duty cycle to 33-50%. In case the repetition frequency is high, the scan length, which has an influence on the resolution, will be limited. Therefore, the Michelson interference type time modulation space imaging Fourier transform spectrometer has poor stability and complex process and is only suitable for targets with slow space and spectrum time change.
Rotating mirror interference spectral imaging is a modified time-modulated michelson interference technique [ j.peter Dybward, et al, "New Interferometer Design Concept", STC Technical Report 2637, Science and Technology Corp, Hampton, VA, under contract # DAAA15-89-D-007, US Army CRDEC, APG, MD, 8/92 ], which is air swept during scanning. That is, when the rotating mirror rotates, the interference spectrogram can be obtained only in a certain angle, and the interference spectrogram is empty-swept in other angles. The working efficiency is low, and only single pixel sampling can be performed, namely, only point targets can be scanned, and only one angle light ray can be used for scanning.
An ultra-high speed scanning Fourier transform infrared spectrometry (Peter R. Griffiths, Blayne L. Hirsche, Christopher J. Man. ultra-rapid-scanning Fourier transform Spectroscopy. visual Spectroscopy19(1999)165-176.) solves the problem of rotating mirror null scan, but can only sample a single pixel. If the interference pattern of a line target or a plane target is to be obtained, a front scanning system is added at the front part of the system, so that each point of the target is scanned one by one, and finally, the interference pattern of the whole target is obtained through aggregation. The defects are that the system structure is complex, the volume is large and the weight is heavy. Due to poor real-time performance, the quality of the spectrogram is influenced, the scanning time is long, the scanning speed is low, the resolution ratio is low, and the applicable working range is narrow.
Disclosure of Invention
The invention aims to provide an imaging method of an interference imaging spectrometer with high stability and high spectral resolution and a spectrometer for realizing the method, which solve the technical problems that only a single pixel can be sampled, the working efficiency is low, or the system structure is complex, the scanning speed is low, the stability is poor, and the spectral resolution is relatively low in the background technology.
The technical solution of the invention is as follows:
an imaging method of an interference imaging spectrometer with high stability and high spectral resolution is characterized in that: the method comprises the following steps
1) The collimator lens 1 converts a light beam from a target into a parallel light beam;
2) the beam splitter 2 splits the parallel light beam into a reflected light beam IFAnd a transmitted light beam IT；
(i) The reflected beam I split by the beam splitter 2FThe first beam of light is reflected for a plurality of times by the rotating mirror 3 and the A-angle reflector 5, then returns to the beam splitter 2, and is converged to the detector 9 through the Fourier lens 8 to form a first optical path;
(ii) the transmitted light split by the beam splitter 2Bundle ITThe light reaches the plane reflecting mirror 7, is reflected for multiple times by the plane reflecting mirror 7 and the B-angle reflector 6, then returns to the beam splitter 2, and is converged to the detector 9 through the Fourier lens 8 to form a second light optical path;
3) when the first beam of light and the second beam of light reach the detector 9 through the Fourier lens 8, an optical path difference is generated to form two beams of coherent light, and an interference spectrogram is generated on the detector 9;
4) synchronously moving the A corner reflector 5 and the B corner reflector 6 along the direction vertical to the plane of the beam splitter 2, changing the range of optical path difference of the first beam of light and the second beam of light reaching the detector 9 through the Fourier lens 8, and generating an interference spectrogram corresponding to the range of the changed optical path difference on the detector 9;
5) after the interference spectrograms corresponding to different optical path difference ranges are superposed, the Fourier transform is carried out by the computer processing system 12 to obtain a target restoration image with high spectral resolution.
The optical path of the first beam of light may be
1) The reflected beam I split by the beam splitter 2F
(i) The reflected light is reflected to an A-angle reflector 5 by the turning mirror 3, and the A-angle reflector 5 reflects the incident light to the turning mirror 3 along a direction parallel to the incident direction;
(ii) the turning mirror 3 reflects the light back to the beam splitter 2;
(iii) the light reflected back to the beam splitter 2 is again split into a reflected beam IFFAnd a transmitted light beam IFT；
2) Transmitted light beam IFTThe light passes through the beam splitter (2) and is converged to a detector (9) through a Fourier lens (8);
the optical path of the second light may be
1) The transmitted beam I split by the beam splitter 2T
(i) Reflected by the plane mirror 7 to the B-corner reflector 6, the B-corner reflector 6 reflects the incident light back to the plane mirror 7 in a direction parallel to the incident direction;
(ii) the plane mirror 7 reflects the light back to the beam splitter 2:
(iii) the light reflected back to the beam splitter 2 is again split into a reflected beam ITFAnd a transmitted light beam ITT：
2) Reflected light beam ITFAnd is converged to a detector (9) by a Fourier lens (8).
The utility model provides a realize the spectrum appearance of above-mentioned high stability high spectral resolution interference imaging spectrum appearance imaging method, includes Fourier lens 8, is located detector 9 on Fourier lens 8 focal plane, and computer processing system 12 that is connected with detector 9 sets up collimating lens 1 on leading optical system 11 primary optical axis, sets up beam splitter 2 on collimating lens 1 axis 00', its special character lies in: the device also comprises a plane mirror 7, a rotating mirror 3 connected with a motor 4, an A corner reflector 5 and a B corner reflector 6 which are connected with a driving mechanism 10 and can synchronously move along the direction vertical to the plane of the beam splitter 2; the position of the plane mirror 7 should satisfy: when the turning mirror 3, the a corner reflector 5 and the B corner reflector 6 are positioned at a certain position,
1) reflected beam I having light on the main optical axis first split by beam splitter 2FIs a first beam of light; the first beam of light is reflected for a plurality of times by the turning mirror 3 and the A-angle reflector 5, then returns to the beam splitter 2, and is converged to the optical path of the first beam of light formed by the detector 9 through the Fourier lens 8:
2) the transmitted beam I of light on the main optical axis first split by the beam splitter 2TIs a second beam of light; the second beam of light reaches the plane reflecting mirror 7, is reflected for a plurality of times by the plane reflecting mirror 7 and the B-angle reflector 6, returns to the beam splitter 2, and is converged to the optical path of the second beam of light formed by the detector 9 through the Fourier lens 8;
3) the intersection point of the first beam of light returning to the beam splitter 2 coincides with the intersection point of the second beam of light returning to the beam splitter 2:
4) the first beam of transmitted light I, which is split again by the beam splitter 2FTAnd a reflected light beam I in which the second beam is split again by the beam splitter 2TFThe light paths are overlapped;
5) the optical path of the first beam of light is equal to that of the second beam of light; the position of the beam splitter 2 should also be such that:
1) initial incident light passing through the collimator lens 1 can be received;
2) can receive the reflected light reflected by the turning mirror 3 and the A corner reflector 5;
3) can receive the reflected light reflected by the plane reflector 7 and the B corner reflector 6; the corner reflector A5 and the corner reflector B6 have the same structure and are fixedly connected into a whole in a back direction: the optical axis of the Fourier lens 8 is positioned in the transmission beam I of the first beamFTReflected light beam I of the second lightTFThe coincident light paths.
The detector 9 is preferably an infrared detector, and specifically, a CCD infrared detector may be used.
The turning mirror 3 is preferably formed by an inclined end surface of a cylinder, which is convenient for processing and mounting.
The invention has the following advantages:
1. high-frequency scanning can be realized, and the stability is good. The rotating mirror type moving mirror is adopted, the system runs continuously, and when the scanning speed is high, the rotating servo system can still keep good stability due to the action of inertia.
2. The anti-interference capability is strong. Because the time for obtaining the interference pattern is extremely short, the system has low sensitivity to vibration, and the mechanical vibration frequency generally has no influence on the quality of a spectrogram.
3. The light path formed by matching the corner reflector and the rotating mirror has self-compensation characteristic, so that the invention has better anti-interference performance.
4. The scanning efficiency is high. The rotating mirror takes the end face of a cylinder with a certain gradient as a reflecting face, and rotates under the driving of a motor, so that the phenomenon of empty scanning is avoided, and the scanning efficiency is high.
5. Direct scanning of line or area objects can be achieved. The angle reflector is adopted, so that not only can the light rays of the main optical axis be scanned, but also the light rays with a certain angle can be scanned, the line target or the surface target can be directly scanned, the scanning time is shortened, and the scanning efficiency and the quality of a spectrogram are further improved.
6. Good real-time performance, higher resolution and wide working range. It is especially suitable for large area scanning of large target.
7. The power consumption is low, and the required driving power is small.
8. Simple structure, small volume and light weight.
9. Two corner reflectors with the same structure are fixedly connected into a whole in a back direction, the structure has symmetry, the influence of errors generated by machining can be offset, and the position is easy to determine during assembly.
The A corner reflector 5 and the B corner reflector 6 are bound into a whole, when the A corner reflector and the B corner reflector move together in the horizontal direction, the A corner reflector and the B corner reflector are mutually offset under the influence of horizontal displacement, and the A corner reflector and the B corner reflector have the characteristic of self-compensation, so that the signal-to-noise ratio is improved.
11. The design of combining the B-angle reflector 6 and the plane reflector 7 is adopted, so that the overall structure of the instrument is greatly reduced, and the weight of the instrument is reduced.
12. The spectral resolution is greatly improved. The A corner reflector 5 and the B corner reflector 6 are driven by the driving mechanism 10 to simultaneously move horizontally to obtain interference spectrograms in different optical path difference ranges, and the interference spectrograms are superposed in a cubic data mode.
The spectral resolution can be obtained by computer processing and is several times or even higher than that of the A corner reflector 5 and the B corner reflector 6 when the positions of the A corner reflector and the B corner reflector are fixed.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic structural diagram of an embodiment of the present invention.
The reference numbers illustrate: 1-collimating lens, 2-beam splitter, 3-rotating mirror, 4-motor, 5-A corner reflector, 6-B corner reflector, 7-plane reflector, 8-Fourier lens, 9-detector, 10-driving mechanism, 11-front optical system, 12-computer processing system and 13-observed object.
Detailed Description
Referring to fig. 1, the optical system of the present invention mainly comprises a collimating lens 1, a beam splitter 2, a turning mirror 3, an a corner reflector 5, a B corner reflector 6, a front optical system 11 and a fourier lens 8; the interference system mainly comprises a collimating lens 1, a beam splitter 2, a rotating mirror 3, an A corner reflector 5, a B corner reflector 6, a plane reflecting mirror 7 and a Fourier lens 8. The detection system is mainly formed by the detector 9 and the information processing system is mainly formed by the computer processing system 12, see fig. 2.
The working principle of the invention is as follows:
1) when the rotating mirror 3 is at rest, the light beam on the main optical axis is split into two beams by the beam splitter 2, and the optical paths of the two beams are equal.
2) When the rotating mirror 3 is driven by the motor 4 to rotate, the reflected light beam I which is split by the beam splitter 2 for the first timeFThe first light beam is reflected by the turning mirror 3 and the A-angle reflector 5 for multiple times, returns to the beam splitter 2, and reaches the Fourier lens 8 with a changed optical path. And the transmitted beam I first split by the beam splitter 2TThe second beam is reflected by the plane mirror 7 and the B-corner reflector 6 for a plurality of times, returns to the beam splitter 2, and is reflected by the beam splitter 2 to reach the fourier lens 8 without changing the optical path length. The optical paths of the two beams of light are not overlapped any more, and the optical paths of the two beams of light reaching the detector 9 are not equal any more, so that an optical path difference is generated, the two beams of coherent light become two beams of coherent light, and an interference pattern is generated on the detector 9. The optical path difference of the two beams of light is continuously changed along with the rotation of the rotating mirror 3, thereby obtaining a certain optical path difference rangeInterference spectrogram in the enclosure.
3) When the rotating mirror 3 is driven by the motor 4 to rotate, the A corner reflector 5 and the B corner reflector 6 are driven by the driving mechanism 10 to synchronously move along the direction vertical to the plane of the beam splitter 2, so that the range of optical path difference of the first beam of light and the second beam of light reaching the detector 9 through the Fourier lens 8 is changed, and interference spectrograms in different optical path difference ranges are generated on the detector 9. Interference spectrograms corresponding to different optical path difference ranges are overlapped in a cubic data mode, and after Fourier transformation is carried out by the computer processing system 12, a target restoration image with high spectral resolution which is several times or even higher than that of a target restoration image with high spectral resolution when the positions of the A corner reflector 5 and the B corner reflector 6 are fixed can be obtained.
For example: when the A corner reflector 5 and the B corner reflector 6 are at a certain position, the optical path difference range is [0, 1 ]; when the a-corner reflector 5 and the B-corner reflector 6 move to the next positions, the optical path difference range becomes [1, 2; the A corner reflector 5 and the B corner reflector 6 continue to move, the optical path difference range is changed to [2, 3] … at the next position, and the like, and an interference spectrogram corresponding to the changed optical path difference range is generated on the detector 9. After the interference spectrograms corresponding to the different optical path difference ranges are superposed, Fourier transformation is carried out through the computer processing system 12 to obtain a restored target image.
4) The rotating mirror 3 is driven by the motor 4 to rotate at a high speed, and high-speed scanning can be realized.
Referring to fig. 1, the axis 00' of the collimator lens 1 of the present invention is located on the main optical axis of the front optical system 11. The beam splitter 2 is positioned to receive both the initial incident light passing through the collimator lens 1 and the light reflected multiple times by the turning mirror 3 and the a-corner reflector 5, and the plane mirror 7 and the B-corner reflector 6. The position of the rotating mirror 3 connected with the motor 4 is set according to the actual design requirement. The corner reflector A5 and the corner reflector B6 have the same structure, are fixedly connected back to back into a whole, are connected with the driving mechanism 10 and can synchronously move along the direction vertical to the plane of the beam splitter 2. The position of the plane mirror 7 should satisfy: when the turning mirror 3, the a corner reflector 5 and the B corner reflector 6 are positioned at a certain position,
1) reflected beam I of light on the main optical axis first split at beam splitter 2FIs a first beam of light; it is reflected for multiple times by a rotating mirror 3 and an A-angle reflector 5, returns to the beam splitter 2 and is divided into a reflected beam I by the beam splitter 2FFAnd a transmitted light beam IFrTransmitted light beam IFTThe optical path through the fourier lens 8 to the detector 9 forms the optical path of the first light.
2) Transmitted beam I of light on the main optical axis first split at beam splitter 2TIs a second beam of light; it is reflected by the plane mirror 7 and the B-angle reflector 6 for multiple times, returns to the beam splitter 2, and is divided into a reflected beam I by the beam splitter 2TFAnd a transmitted light beam ITTReflecting the light beam ITFThe optical path through the fourier lens 8 to the detector 9 forms the optical path of the second light.
3) The intersection point at which the first beam of light returns to the beam splitter 2 coincides with the intersection point at which the second beam of light returns to the beam splitter 2.
4) The first beam of transmitted light I, which is split again by the beam splitter 2FTAnd a reflected light beam I in which the second beam is split again by the beam splitter 2TFThe light paths coincide.
5) The optical path of the first beam is equal to the optical path of the second beam. The optical axis of the Fourier lens 8 is positioned in the transmitted beam I of the first beamFTReflected light beam I of the second lightTFThe coincident light paths. The detector 9 is located in the focal plane of the fourier lens 8. The detector 9 is preferably an infrared CCD detector. The observed object 13 shown in fig. 2 is a rocket, which is a schematic view of the present invention for observing the tail flame of the rocket.
The light transmission process of the invention:
1. the light beam from the target reaches the collimating lens 1 through the front optical system 11, and the collimating lens 1 converts the target light beam into a parallel light beam; the parallel light beams are projected onto the beam splitter 2 coated with the semi-transparent and semi-reflective film.
2. The beam splitter 2 splits the light beam into a reflected light beam IFAnd transmitted lightBundle IT. Wherein,
1) the reflected beam I split by the beam splitter 2F
(1) The light is reflected to an A-angle reflector 5 through a rotating mirror 3, and the A-angle reflector 5 reflects the incident light to the rotating mirror 3 along the direction parallel to the incident direction;
(2) the turning mirror 3 reflects the light back to the beam splitter 2;
(3) the light reflected back to the beam splitter 2 is again split into reflected light beams IFFAnd a transmitted light beam IFT. 2) The transmitted beam I split by the beam splitter 2T
(1) Reflected by the plane mirror 7 to the B-corner reflector 6, the B-corner reflector 6 reflecting the incident light back to the plane mirror 7 in a direction parallel to the incident direction;
(2) the plane mirror 7 reflects the light back to the beam splitter 2;
(3) the light reflected back to the beam splitter 2 is again split into reflected light beams ITFAnd a transmitted light beam ITT。
3, reflected light beam I divided by beam splitter 2FThe transmitted beam I, which is split again by the beam splitter 2FTAnd passes through the beam splitter 2 to the fourier lens 8 to be received by a detector 9 located at the focal plane of the fourier lens 8.
4. The transmitted beam I split by the beam splitter 2TThe reflected light beam I divided again by the beam splitter 2TFAnd passes through a fourier lens 8 to be received by a detector 9 located at the focal plane of the fourier lens 8.
5. The reflected light beam I first split by the beam splitter 2FReflected by the rotating mirror 3 and the first A-angle reflector 5, returned to the beam splitter 2 and converged to be detected by the Fourier lens 8; the transmitted beam I first split by the beam splitter 2TThe second beam reaches the plane reflector 7, is reflected by the plane reflector 7 and the B-angle reflector 6, returns to the beam splitter 2, and is converged to the detector 9 through the Fourier lens 8 to form a second optical path; the two beams of light produce an optical path differenceInto two coherent beams, which produce an interference spectrum on the detector 9.
And 6. the A corner reflector 5 and the B corner reflector 6 synchronously move along the direction vertical to the plane of the beam splitter 2 under the driving of the driving mechanism 10, and the interference spectrograms of the first beam of light and the second beam of light in different optical path difference ranges can be obtained by changing the optical path difference range of the first beam of light and the second beam of light reaching the detector 9 through the Fourier lens 8.
7. After the interference spectrograms corresponding to different optical path difference ranges are superposed, the Fourier transform is carried out by the computer processing system 12 to obtain a target restoration image with high spectral resolution.
Claims (5)
1. An imaging method of a high-stability high-spectral-resolution interference imaging spectrometer is characterized in that: the method comprises the following steps
1) A collimator lens (1) converts a light beam from a target into a parallel light beam;
2) the beam splitter (2) splits the parallel light beam into a reflected light beam IFAnd a transmitted light beam IT；
(ii) a reflected light beam I divided by the beam splitter (2)FIs reflected for a plurality of times by a rotating mirror (3) and an A-angle reflector (5), then returns to the beam splitter (2) and is converged to the detection probe by a Fourier lens (8)A detector (9) for forming an optical path of the first beam:
the transmitted beam I split by the beam splitter (2)TThe beam reaches a plane reflector (7), is reflected for multiple times by the plane reflector (7) and a B-angle reflector (6), returns to a beam splitter (2), and is converged to a detector (9) through a Fourier lens (8) to form a second optical path;
3) when the first light beam and the second light beam reach a detector (9) through a Fourier lens (8), an optical path difference is generated, the first light beam and the second light beam become two coherent light beams, and an interference spectrogram is generated on the detector (9);
4) the interference spectrogram is subjected to Fourier transform by a computer processing system (12) to obtain a restored target image.
2. The imaging method of the high-stability high-spectral-resolution interferometric imaging spectrometer of claim 1, characterized in that: the optical path of the first light is
1) A reflected light beam I divided by the beam splitter (2)F
(i) The light is reflected to the A-angle reflector (5) by the rotating mirror (3), and the A-angle reflector (5) reflects the incident light to the rotating mirror (3) along the direction parallel to the incident direction;
(ii) the rotating mirror (3) reflects the light back to the beam splitter (2);
(iii) the light reflected back to the beam splitter (2) is again split into a reflected beam IFFAnd a transmitted light beam IFT；
2) Transmitted light beam IFTThe light passes through the beam splitter (2) and is converged to a detector (9) through a Fourier lens (8);
the optical path of the second light is
1) The transmitted beam I split by the beam splitter (2)T
(i) The light is reflected to a B-angle reflector (6) by a plane reflector (7), and the B-angle reflector (6) reflects the incident light to the plane reflector (7) along the direction parallel to the incident direction;
(ii) the plane mirror (7) reflects the light back to the beam splitter (2);
(iii) the light reflected back to the beam splitter (2) is again split into a reflected beam ITFAnd a transmitted light beam ITT；
2) Reflected light beam ITFAnd is converged to a detector (9) by a Fourier lens (8).
3. A spectrometer for implementing the imaging method of the high-stability high-spectral resolution interference imaging spectrometer of claim 1, comprising a fourier lens (8), a detector (9) located on the focal plane of the fourier lens (8), a computer processing system (12) connected to the detector (9), a collimator lens (1) arranged on the primary optical axis of the front optical system (11), and a beam splitter (2) arranged on the axis 00' of the collimator lens (1), wherein: the device also comprises an A corner reflector (5), a B corner reflector (6), a plane reflector (7) and a rotating mirror (3) connected with a motor (4); the position of the plane reflector (7) should satisfy: when the rotating mirror (3), the A corner reflector (5) and the B corner reflector (6) are positioned at a certain position,
1) the reflected light beam I of which the light on the main optical axis is split off for the first time by the beam splitter (2)FIs a first beam of light; the first beam of light is reflected for multiple times by the turning mirror (3) and the A-angle reflector (5), returns to the beam splitter (2), and is converged to the optical path of the first beam of light formed by the detector (9) through the Fourier lens (8);
2) a transmitted beam I of light on the main optical axis first split by the beam splitter (2)TIs a second beam of light; the second beam of light reaches the plane reflecting mirror (7), is reflected for multiple times by the plane reflecting mirror (7) and the B-angle reflector (6), returns to the beam splitter (2), and is converged to the optical path of the second beam of light formed by the detector (9) through the Fourier lens (8);
3) the intersection point of the first beam of light returning to the beam splitter (2) coincides with the intersection point of the second beam of light returning to the beam splitter (2);
4) a transmitted beam I of the first light which is split again by the beam splitter (2)FTAnd a reflected light beam I of which the second beam is divided again by the beam splitter (2)TFThe light paths are overlapped;
5) the optical path of the first beam of light is equal to that of the second beam of light;
the position of the beam splitter (2) should also satisfy:
1) can receive initial incident light passing through the collimating lens (1);
2) can receive the reflected light reflected by the rotating mirror (3) and the A corner reflector (5);
3) can receive the reflected light reflected by the plane reflector (7) and the B corner reflector (6); the corner reflector A (5) and the corner reflector B (6) have the same structure and are fixedly connected back to form a whole;
the optical axis of the Fourier lens (8) is formed by a transmitted beam I of the first lightFTReflected light beam I of the second lightTFThe coincident light paths.
4. The high-stability high-spectral resolution interferometric imaging spectrometer of claim 3, wherein: the detector (9) is an infrared detector.
5. The high stability interferometric imaging spectrometer of claim 3 or 4, in which: the rotating mirror (3) is composed of the inclined end surface of a cylinder.
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| JP5101468B2 (en) * | 2007-12-07 | 2012-12-19 | 富士フイルム株式会社 | IMAGING SYSTEM, IMAGING DEVICE EQUIPPED WITH THIS IMAGING SYSTEM, PORTABLE TERMINAL DEVICE, IN-VEHICLE DEVICE, MEDICAL DEVICE, AND IMAGING SYSTEM MANUFACTURING METHOD |
| CN102564589B (en) * | 2011-12-20 | 2013-07-24 | 华中科技大学 | Spectral characteristic detection identification method for multi-wave-band moving objects and device thereof |
| CN103308926B (en) * | 2013-06-18 | 2015-07-22 | 浙江大学 | Laser radar set with high spectral resolution |
| CN113640241B (en) * | 2021-08-20 | 2023-03-14 | 中国科学院空天信息创新研究院 | Oscillating Fourier transform infrared spectrum device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5066990A (en) * | 1988-11-17 | 1991-11-19 | Erwin Kayser - Threde Gmbh | Reflector system for michelson interferometers |
| CN1145114A (en) * | 1994-03-10 | 1997-03-12 | 奥普斯公司 | Interferometer and Fourier transform spectrometer |
| CN2619244Y (en) * | 2003-05-12 | 2004-06-02 | 中国科学院西安光学精密机械研究所 | Optical path difference rotating mirror system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5066990A (en) * | 1988-11-17 | 1991-11-19 | Erwin Kayser - Threde Gmbh | Reflector system for michelson interferometers |
| CN1145114A (en) * | 1994-03-10 | 1997-03-12 | 奥普斯公司 | Interferometer and Fourier transform spectrometer |
| CN2619244Y (en) * | 2003-05-12 | 2004-06-02 | 中国科学院西安光学精密机械研究所 | Optical path difference rotating mirror system |
Non-Patent Citations (2)
| Title |
|---|
| 基于高速转镜得高分辩率干涉光谱仪非线性理论研究. 苏星，黄惠民，相里斌.光子学报，第30卷第12期. 2001 * |
| 转镜式傅立叶变换光谱仪光程差非线性得研究. 杨晓许等.光学学报，第24卷第10期. 2004 * |
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