CN108627996B - Variable-gap FP interferometer adjusting mechanism and method based on double-layer light-transmitting frame - Google Patents
Variable-gap FP interferometer adjusting mechanism and method based on double-layer light-transmitting frame Download PDFInfo
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- CN108627996B CN108627996B CN201810427860.1A CN201810427860A CN108627996B CN 108627996 B CN108627996 B CN 108627996B CN 201810427860 A CN201810427860 A CN 201810427860A CN 108627996 B CN108627996 B CN 108627996B
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/62—Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems
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Abstract
The invention discloses an FP interferometer assembling and adjusting mechanism and method based on a double-layer light-transmitting frame. And collecting interference fringe data generated by the interferometer to calculate the positions and the intensities of the spectral peaks at the left side and the right side of the interference cavity, guiding to adjust the angles of the wedge-shaped cavities at the two sides of the zero position of the variable-gap FP interferometer until the wedge-shaped cavities are symmetrical, and irradiating the double-layer light-transmitting frame by using an ultraviolet lamp to cure the ultraviolet photosensitive adhesive at the inner side of the inner frame to form the stable interferometer. According to the invention, the problems of threaded hole processing for adjustment and ultraviolet photosensitive adhesive curing are considered by utilizing the light transmittance and good processing performance of the transparent synthetic resin in an ultraviolet band; the conventional optical glass using the inner frame solves the problem of inconsistent thermal expansion characteristics of the materials of the interferometer lens and the outer frame. The double-layer structure enables the assembled and adjusted interferometer to have better environmental adaptability, reduces the problem of wedge lens sharp edge abrasion caused by repeated assembly and adjustment and the problem of looseness caused by only being suitable for bolt clamping, and improves the usability of the Fourier transform spectrometer based on the variable-gap FP interferometer.
Description
Technical Field
The invention belongs to the field of optical adjustment and calibration, and mainly relates to a method for quickly adjusting a symmetrical wedge-shaped interference cavity of a variable-gap FP interferometer.
Background
In recent years, a novel Fourier transform imaging spectrometer provided by the university of Hawaii in America is deeply researched by various domestic and foreign institutions, the core component of the novel Fourier transform imaging spectrometer is developed and completed by a variable-gap FP interferometer based on a symmetrical wedge-shaped interference cavity, and compared with the traditional scheme based on the Sagnac and Michelson interferometers, the technology can greatly reduce the volume and weight of the system and realize the light and small size of equipment.
When the variable-gap FP interferometer based on the symmetrical wedge-shaped interference cavity is applied to a spectrometer or an imaging spectrometer, the requirements on the symmetry of a wedge angle and the width of a central sharp edge of the interference cavity are very high: if wedge angles on two sides of the interference cavity are not consistent, the step length of interference fringes is not consistent, and the spectrum of the inversion is wrong; the central sharp edge of the interference cavity also needs to keep a small width which is lower than the width of a pixel of a spectrometer (or an imaging spectrometer), otherwise, zero point errors of interference fringes are caused, the correction difficulty is high, and the effect is not ideal.
The conventional clamping method for the optical mechanism needing to ensure the angle comprises two methods, namely clamping by using a metal frame and a bolt, and gluing two lens side surfaces on a substrate. The metal frame and the bolt are used for clamping, stress change, bolt looseness and the like are easily caused due to vibration, temperature change and the like, the stability of the metal frame is influenced, and the central sharp edge of the interference cavity is easily abraded and widened in repeated installation, adjustment and correction. The gluing method is suitable for large contact areas between two lenses and a substrate, is not suitable for two thin lenses in a variable-gap FP interferometer, and is difficult to ensure the firmness of gluing in the actual gluing process because the two thin lenses in the variable-gap FP interferometer are very thin. In addition, at present, the gluing process in the optical field mainly adopts silicon rubber or ultraviolet photosensitive rubber, a long-time (generally not less than 24 hours) curing process is required for using the silicon rubber, the symmetry of two thin lenses in the variable-gap FP interferometer can be influenced by the long curing process, and the symmetry of a wedge angle can also be influenced by the elasticity of the silicon rubber; if the ultraviolet photosensitive adhesive is used, the clamping mechanism is required to transmit ultraviolet light, and meanwhile, the clamping mechanism is required to have a thermal expansion coefficient close to that of the lens, so that the conventional clamping mechanism is difficult to meet the assembly and adjustment requirements of the variable-gap FP interferometer.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a variable-gap FP interferometer adjusting mechanism and method based on a double-layer light-transmitting frame, the instrument is simple to erect, the adjusting process is simple, convenient and reliable, the efficiency is high, and the symmetric real-time adjustment of a wedge-shaped interference cavity of the variable-gap FP interferometer can be realized.
The technical scheme of the invention is as follows:
the utility model provides a become clearance FP interferometer dress adjustment mechanism based on double-deck printing opacity frame, includes optical platform, double-deck printing opacity frame clamping machine structure, single wavelength laser instrument, integrating sphere, camera, supervisory control computer, its characterized in that:
the double-layer light-transmitting frame clamping mechanism consists of an outer frame made of transparent synthetic resin, an inner frame made of optical glass, silicon rubber and a pressing plate; wherein, the outer frame and the inner frame are locally glued and connected by silicon rubber; threaded holes are formed in the four corners of the front face of the outer frame and the centers of all the edges, and through holes are formed in the positions, corresponding to the threaded holes of the outer frame, of the pressing plate; the inner size of the back surface of the outer frame is smaller than that of the front surface of the outer frame, so that a blocking platform is formed; the inner side surface of the inner frame is a rough plane.
Further preferred scheme, the clearance-variable FP interferometer adjusting mechanism based on double-layer light-transmitting frame is characterized in that: the inner frame of the double-layer light-transmitting frame clamping mechanism is made of optical glass sensitive to photosensitive adhesive and having high transmittance in a 320-400 nm waveband, and the difference between the thermal expansion coefficient of the inner frame and the thermal expansion coefficients of a flat lens and a symmetrical wedge-shaped lens of the FP interferometer is less than 5%.
Further preferred scheme, the clearance-variable FP interferometer adjusting mechanism based on double-layer light-transmitting frame is characterized in that: a broadband light source is adopted to replace a single-wavelength laser, and a monochromatic filter is arranged at the outlet of the integrating sphere.
The method for adjusting the variable-gap FP interferometer by using the device is characterized by comprising the following steps of: the method comprises the following steps:
step 1: uniformly coating ultraviolet photosensitive glue in the central areas of four inner side surfaces of the double-layer light-transmitting frame clamping mechanism, and cleaning redundant glue to prevent the glue from dripping;
step 2: sequentially placing the cleaned flat lens and the symmetrical wedge-shaped lens of the variable-gap FP interferometer into a double-layer light-transmitting frame clamping mechanism, covering a pressure plate, screwing a bolt, and not fastening;
and step 3: placing a combined body of a double-layer light-transmitting frame clamping mechanism and a variable-gap FP interferometer to be adjusted in front of an output window of an integrating sphere using a single-wavelength laser as a light source, collecting an interference pattern formed by the interferometer after a camera is placed behind the interferometer, and transmitting the interference pattern to a computer, wherein the computer calculates the size of a left wedge angle and a right wedge angle of an interference cavity according to the known light source wavelength and the collected left and right two-section interference patterns;
and 4, step 4: continuously adjusting the screwing degree of the screwed bolts in the double-layer light-transmitting frame clamping mechanism according to the left and right wedge angle difference given in the step 3, and gradually reducing the wedge angle difference until the wedge angle difference is symmetrical;
and 5: and (3) irradiating the double-layer light-transmitting frame clamping mechanism twice from multiple directions by using an ultraviolet lamp, irradiating for about 10-20 s for the first time to primarily cure the ultraviolet photosensitive adhesive, then judging whether the symmetry of the wedge angle is changed or not from a result given by a computer, repeating the step (4) again to adjust if the symmetry of the wedge angle is changed, and irradiating for about 1-2 min for the second time after ensuring the symmetry of the wedge angle again to completely cure the ultraviolet photosensitive adhesive.
Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the problems of threaded hole processing for adjustment and ultraviolet photosensitive adhesive curing are considered by utilizing the light transmittance and good processing performance of the transparent synthetic resin in an ultraviolet band; the conventional optical glass using the inner frame solves the problem of inconsistent thermal expansion characteristics of the materials of the interferometer lens and the outer frame. The double-layer structure enables the assembled interferometer to have better environmental adaptability, reduces the problem of wedge-shaped lens sharp edge abrasion caused by repeated assembly and adjustment and the problem of looseness caused by only being suitable for bolt clamping, and improves the usability of the Fourier transform spectrometer (and the imaging spectrometer) based on the variable-gap FP interferometer.
Drawings
FIG. 1: an explosion diagram of the double-layer light-transmitting frame adjusting mechanism;
FIG. 2: the front view of the double-layer light-transmitting frame adjusting mechanism;
FIG. 3: the schematic diagram of the double-layer light-transmitting frame installation and adjustment mechanism after the pressing plate is removed;
FIG. 4: installation and adjustment mechanism system schematic diagram.
Detailed Description
The invention is described below with reference to specific examples:
as shown in fig. 4, the variable-gap FP interferometer adjusting mechanism based on the double-layer light-transmitting frame in this embodiment includes an optical platform, a double-layer light-transmitting frame clamping mechanism 3, a single-wavelength laser 1, an integrating sphere 2, a camera 6, and a monitoring computer 7.
As shown in fig. 1 to 3, the double-layer light-transmitting frame clamping mechanism is composed of an outer frame made of transparent synthetic resin, an inner frame made of optical glass, silicon rubber and a pressing plate; wherein, the outer frame and the inner frame are locally glued and connected by silicon rubber; threaded holes are formed in the four corners of the front face of the outer frame and the centers of all the edges, and through holes are formed in the positions, corresponding to the threaded holes of the outer frame, of the pressing plate; the inner size of the back surface of the outer frame is smaller than that of the front surface of the outer frame, so that a blocking platform is formed; the inner side surface of the inner frame has better planeness and larger roughness.
The inner frame of the double-layer light-transmitting frame clamping mechanism is made of optical glass with high transmittance in a photosensitive adhesive sensitive band of 320-400 nm, the thermal expansion coefficient of the inner frame is close to that of a flat lens and a symmetrical wedge-shaped lens, and the difference is not more than 5%.
In addition, a broadband light source can be used to replace a single-wavelength laser, and a monochromatic filter is arranged at the outlet of the integrating sphere to form monochromatic light.
The method for adjusting the variable-gap FP interferometer by using the device is characterized by comprising the following steps of: the method comprises the following steps:
step 1: uniformly coating ultraviolet photosensitive glue in the central areas of four inner side surfaces of the double-layer light-transmitting frame clamping mechanism, and cleaning redundant glue to prevent the glue from dripping;
step 2: sequentially placing the cleaned flat lens and the symmetrical wedge-shaped lens of the variable-gap FP interferometer into a double-layer light-transmitting frame assembling and adjusting mechanism, covering a pressure plate, screwing a bolt, and not fastening;
and step 3: placing a combined body of a double-layer light-transmitting frame clamping mechanism and a variable-gap FP interferometer to be adjusted in front of an output window of an integrating sphere using a single-wavelength laser as a light source, collecting an interference pattern formed by the interferometer after a camera is placed on the interferometer, and transmitting the interference pattern to a computer, wherein the computer automatically calculates the size of a left wedge angle and a right wedge angle of an interference cavity according to the known light source wavelength and the collected left and right two-section interference patterns;
and 4, step 4: continuously adjusting the screwing degree of the bolt according to the left and right wedge angle difference given in the step 3 to gradually reduce the wedge angle difference until the wedge angle difference is symmetrical;
and 5: and (3) irradiating the double-layer light-transmitting frame adjusting mechanism twice from multiple directions by using an ultraviolet lamp, irradiating for about 10-20 s for the first time to primarily cure the ultraviolet photosensitive adhesive, then judging whether the symmetry of the wedge angle is changed or not from a result given by a computer, repeating the step (4) again to adjust if the symmetry of the wedge angle is changed, and irradiating for about 1-2 min for the second time after ensuring the symmetry of the wedge angle again to completely cure the ultraviolet photosensitive adhesive.
Claims (3)
1. The utility model provides a become clearance FP interferometer dress adjustment mechanism based on double-deck printing opacity frame, includes optical platform, double-deck printing opacity frame clamping machine structure, single wavelength laser instrument, integrating sphere, camera, supervisory control computer, its characterized in that:
the double-layer light-transmitting frame clamping mechanism consists of an outer frame made of transparent synthetic resin, an inner frame made of optical glass, silicon rubber and a pressing plate; wherein, the outer frame and the inner frame are locally glued and connected by silicon rubber; threaded holes are formed in the four corners of the front face of the outer frame and the centers of all the edges, through holes are formed in the positions, corresponding to the threaded holes of the outer frame, of the pressing plate, the pressing plate is matched with the outer frame through bolts, the screwing-in degree of the bolts is continuously adjusted in the assembling and adjusting process, and the left and right wedge angle difference of an interference cavity formed by the flat lens and the symmetrical wedge lens can be gradually reduced until the interference cavity is symmetrical; the inner size of the back surface of the outer frame is smaller than that of the front surface of the outer frame, so that a blocking platform is formed; the inner side surface of the inner frame is a rough plane;
the inner frame of the double-layer light-transmitting frame clamping mechanism is made of optical glass with high transmittance at a photosensitive adhesive sensitive waveband, and the difference between the thermal expansion coefficient of the inner frame and the thermal expansion coefficients of a flat lens and a symmetrical wedge-shaped lens of the FP interferometer is less than 5%;
after the variable-gap FP interferometer is assembled and adjusted, the double-layer light-transmitting frame clamping mechanism, the flat lens and the symmetrical wedge-shaped lens jointly form a variable-gap FP interferometer assembly for use.
2. The mechanism of claim 1, wherein the mechanism is based on a double-layer light-transmitting frame for adjusting the FP interferometer, and comprises: a broadband light source is adopted to replace a single-wavelength laser, and a monochromatic filter is arranged at the outlet of the integrating sphere.
3. A method for adjusting a variable gap FP interferometer using the mechanism of claim 1, characterized by: the method comprises the following steps:
step 1: uniformly coating ultraviolet photosensitive glue in the central areas of four inner side surfaces of the double-layer light-transmitting frame clamping mechanism, and cleaning redundant glue to prevent the glue from dripping;
step 2: sequentially placing the cleaned flat lens and the symmetrical wedge-shaped lens of the variable-gap FP interferometer into a double-layer light-transmitting frame clamping mechanism, covering a pressure plate, screwing a bolt, and not fastening;
and step 3: placing a combined body of a double-layer light-transmitting frame clamping mechanism and a variable-gap FP interferometer to be adjusted in front of an output window of an integrating sphere using a single-wavelength laser as a light source, collecting an interference pattern formed by the interferometer after a camera is placed behind the interferometer, and transmitting the interference pattern to a computer, wherein the computer calculates the size of a left wedge angle and a right wedge angle of an interference cavity according to the known light source wavelength and the collected left and right two-section interference patterns;
and 4, step 4: continuously adjusting the screwing degree of the screwed bolts in the double-layer light-transmitting frame clamping mechanism according to the left and right wedge angle difference given in the step 3, and gradually reducing the wedge angle difference until the wedge angle difference is symmetrical;
and 5: and (3) irradiating the double-layer light-transmitting frame clamping mechanism twice from multiple directions by using an ultraviolet lamp, irradiating for about 10-20 s for the first time to primarily cure the ultraviolet photosensitive adhesive, then judging whether the symmetry of the wedge angle is changed or not from a result given by a computer, repeating the step (4) again to adjust if the symmetry of the wedge angle is changed, and irradiating for about 1-2 min for the second time after ensuring the symmetry of the wedge angle again to completely cure the ultraviolet photosensitive adhesive.
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| CN111504609B (en) * | 2020-04-07 | 2022-02-15 | 西安应用光学研究所 | Wedge angle determination method for variable-gap Fabry-Perot interferometer |
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