A middle wave infrared lens transmittance detection device

Abstract

The application discloses a kind of middle wave infrared lens transmittance detection devices, and the transmittance of middle wave infrared system is measured efficiently using compatibility design, and the control between each test mode is realized.The device includes: optical platform, optical system arranged on the optical platform and shell arranged outside the optical system;The optical system includes: point light source, reference light path, measured lens, test light path and detector;The point light source, measured lens, test light path and detector are arranged with optical axis;The reference light path is arranged with the point light source, measured lens and detector from optical axis;The detector receives the light information of reference light path and test light path to detect the transmittance of the measured lens.The application uses the same system, and the transmittance of transmission type and reflection type optical lens can be compatible with test, increases the test range of user, and greatly improves the general performance of equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of middle wave infrared testing, in particular to a middle wave infrared lens transmittance detection device. BACKGROUND

[0002] In high-precision measurement, the transmittance of an optical lens needs to be tested. On the one hand, the transmittance can represent the transmission capability of an optical system and provide a theoretical basis for the selection of a rear-end detector. On the other hand, it is an important index for evaluating the light suppression level of an optical system. Therefore, the transmittance of the system needs to be quantitatively measured. The existing common transmittance testing method is to measure the ratio of the total light flux of the optical system to the total incident light flux.

[0003] At present, the testing method of the spectral transmittance of a visible optical system is relatively mature, but the existing domestic and foreign testing instruments can generally only meet the testing of visible light, near-infrared small optical elements or small optical systems. There are few transmittance testing devices for middle wave infrared systems. This is mainly limited by the fact that the middle wave infrared system is greatly affected by thermal radiation, and the testing system has high requirements for the stability of the light source, the background noise of the system and the detection rate of the detector, and cannot be compatible with the coaxial and off-axis optical systems. Therefore, it is of great significance to develop an infrared lens transmittance automatic measurement device with compatibility for evaluating the radiation energy transmission capability of different optical systems and providing quantitative indexes for optimizing the design of optical systems and developing infrared spectral measurement and infrared imaging technology. SUMMARY

[0004] In order to solve the problems in the prior art, the present application provides a middle wave infrared lens transmittance detection device, which adopts a compatibility design to efficiently measure the transmittance of a middle wave infrared system and realize the control between different testing modes.

[0005] The technical solution adopted by the present application to solve the technical problems is as follows:

[0006] A middle wave infrared lens transmittance detection device, comprising: an optical platform, an optical system arranged on the optical platform, and an outer shell arranged outside the optical system; the optical system comprises: a point light source, a reference light path, a measured lens, a test light path and a detector; the point light source, the measured lens, the test light path and the detector are arranged along the optical axis; the reference light path is arranged away from the optical axis of the point light source, the measured lens and the detector; the detector receives the signals of the reference light path and the test light path to detect the transmittance of the measured lens.

[0007] Preferably, the test light path comprises: a first half-reflection half-transmission lens, a first relay lens, a second half-reflection half-transmission lens and a second relay lens arranged along the optical axis in sequence.

[0008] Preferably, a partition is arranged between the point light source and the first half reflective half-transmissive lens, the first diaphragm and the second diaphragm are arranged on the partition, and the first diaphragm is arranged in the optical axis direction and the second diaphragm is arranged in the off-axis direction.

[0009] Preferably, the first half reflective half-transmissive lens is arranged on the optical platform through a two-dimensional sliding table, the two-dimensional sliding table is composed of a first optical axis direction sliding table and a vertical optical axis direction sliding table, the first optical axis direction sliding table is fixed on the optical platform, the vertical optical axis direction sliding table is arranged on the first optical axis direction sliding table, and the first optical axis direction sliding table and the vertical optical axis direction sliding table are arranged in the orthogonal direction, the first half reflective half-transmissive lens is arranged above the vertical optical axis direction sliding table through a first half reflective half-transmissive lens base, and the first optical axis direction sliding table and the vertical optical axis direction sliding table are arranged in the optical axis direction and the vertical optical axis direction.

[0010] Preferably, the first optical axis direction sliding table comprises a first stepper motor, a first lead screw, a first lead screw nut, a first guide rail, a first sliding block, a first base and a first table top, one end of the first lead screw is coaxially connected with the first stepper motor to drive the first lead screw to rotate, the other end is fixed with the first base, the first base is arranged on the optical platform, the first lead screw nut is arranged in cooperation with the first lead screw, the first lead screw nut is fixed at the bottom of the end face of the first table top, the first sliding block is connected with the first lead screw nut, and the first sliding block is connected with the guide rail arranged at both ends of the first base in cooperation, the vertical optical axis direction sliding table comprises a second stepper motor, a second lead screw, a second lead screw nut, a second guide rail, a second sliding block, a second base and a second table top, one end of the second lead screw is coaxially connected with the second stepper motor to drive the second lead screw to rotate, the other end is fixed with the second base, the second base is arranged on the first table top, the second lead screw nut is arranged in cooperation with the second lead screw, the second lead screw nut is fixed at the bottom of the end face of the second table top, the second sliding block is connected with the second lead screw nut, and the second sliding block is connected with the guide rail arranged at both ends of the second base in cooperation.

[0011] Preferably, the measured lens is arranged on the optical platform through a second axial sliding table and a rotating and pitching platform, the second axial sliding table is fixed on the optical platform, and the rotating and pitching platform is arranged on the second axial sliding table, and the measured lens is arranged on the rotating and pitching platform.

[0012] Preferably, the rotating and tilting platform is composed of a rotating platform and a tilting platform; the rotating platform comprises an end cover, a worm gear and a worm gear cooperation movement; the worm gear is manually adjusted to rotate, the worm gear drives the worm gear meshing with the worm gear to rotate, and the worm gear drives the upper end cover to rotate; the tilting platform is installed on the end cover, and the tilting platform comprises a worm gear pair, an upper end surface, a bottom surface, an arc guide rail slider and an arc guide rail; the upper end surface is installed on the incomplete worm gear, and the arc guide rail slider is installed on the upper end surface and cooperates with the arc guide rail installed on the bottom surface; the worm gear installed on the bottom surface of the tilting platform is adjusted to rotate, the worm gear drives the incomplete worm gear to rotate, and the incomplete worm gear drives the upper end surface of the tilting platform to rotate along the arc guide rail pair to realize tilting movement.

[0013] Preferably, the reference light path comprises a first reflecting mirror and a second reflecting mirror arranged off-axis.

[0014] Preferably, one part of the point light source emits middle wave infrared light, is reflected by the first half-reflecting half-transmitting lens, the first reflecting mirror, the second reflecting mirror and the second half-reflecting half-transmitting lens, passes through the second relay lens and is received by the detector; another part of the light is transmitted by the first half-reflecting half-transmitting lens, is converged by the measured lens, is transmitted by the first relay lens, the second half-reflecting half-transmitting lens and the second relay lens and is received by the detector.

[0015] Preferably, the measured lens is a transmissive optical lens or a reflective optical lens.

[0016] Preferably, the controller is further connected with the first diaphragm, the second diaphragm, the two-dimensional sliding table, the second axial sliding table and the rotating and tilting platform to control the opening, closing and aperture size of the first diaphragm and the second diaphragm, and control the movement distance and movement direction of the two-dimensional sliding table, the second axial sliding table and the rotating and tilting platform.

[0017] The present application has the following advantages:

[0018] 1. The same system can be used for testing the transmittance of transmissive and reflective optical lenses, increasing the test range of users and greatly improving the universal performance of the equipment.

[0019] 2. The on-axis and off-axis field detection is realized by combining the focal plane detection with the precise angle control, greatly widening the test range of the infrared lens and making the transmittance parameter test more comprehensive.

[0020] 3. The intelligent degree of the equipment is improved by controlling the diaphragm, realizing the full-automatic measurement, ensuring the reliability of the test results by the comparison measurement with the reference light path and ensuring the high precision of the test system by the double-channel test principle. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1The application is a structure schematic diagram of a middle wave infrared lens transmittance detection device.

[0022] Figure 2 The application is a structure schematic diagram of a middle wave infrared lens transmittance detection device optical system.

[0023] Figure 3 The application is a structure schematic diagram of a middle wave infrared lens transmittance detection device inner plate.

[0024] Figure 4 The application is a light path diagram of a middle wave infrared lens transmittance detection device.

[0025] In the figure: 1, optical platform, 2, first mirror base, 3, first mirror, 4, measured lens, 5, measured lens mounting seat, 6, second mirror base, 7, second mirror, 8, second half mirror half lens frame, 9, second relay lens frame, 10, detector, 11, detector sliding table, 12, detector bending plate, 13, second relay lens, 14, second relay lens base, 15, second half mirror half lens, 16, second half mirror half lens base, 17, first relay lens, 18, first relay lens frame, 19, first relay lens base, 20, rotating pitching platform, 21, second axial sliding table, 22, first half mirror half lens frame, 23, first half mirror half lens base, 24, two-dimensional sliding table, 25, first half mirror half lens, 26, point light source clamp, 27, point light source base, 28, point light source, 29, shell, 30, first diaphragm, 31, second diaphragm. DETAILED DESCRIPTION

[0026] The application will be further described in detail below in combination with the drawings and examples.

[0027] A middle wave infrared lens transmittance detection device, as Figure 1As shown, the device comprises: an optical platform 1, an optical system arranged on the optical platform, and a housing 29 arranged outside the optical system; the optical system comprises: a point light source 28, a reference light path, a measured lens 4, a test light path, and a detector 10; the point light source 28, the measured lens 4, the test light path, and the detector 10 are arranged on the optical axis; the reference light path is arranged away from the optical axis of the point light source 28, the measured lens 4, and the detector 10; the detector 10 receives signals of the reference light path and the test light path to detect the transmittance of the measured lens 4. The point light source 28 is installed on a point light source base 27 through a point light source clamp 26, and the point light source base 27 is installed on the optical platform 1; the measured lens 4 is installed on a measured lens mounting seat 5, and the measured lens mounting seat 5 is installed on a rotary and pitching platform 20, which can realize adjustment of the rotary and pitching angles, and the rotary and pitching platform 20 is installed on a second axial slide table 21, which can realize one-way displacement, and the second axial slide table 21 is installed on the optical platform 1; the rotary and pitching platform 20 is composed of a rotary platform and a pitching platform; the rotary platform comprises an end cover, a worm gear, and a worm gear cooperation movement, a manual adjustment worm gear is rotated, the worm gear drives the worm gear meshing with the worm gear to rotate, and the worm gear drives the upper end cover to rotate; the pitching platform is arranged on the end cover, and the pitching platform comprises a worm gear pair, an upper end surface, a bottom surface, an arc-shaped guide rail slider, and an arc-shaped guide rail; the upper end surface is installed on an incomplete worm gear, and the upper end surface is installed with the arc-shaped guide rail slider, which cooperates with the arc-shaped guide rail installed on the bottom surface; the worm gear installed on the bottom surface of the pitching platform is adjusted to rotate, the worm gear drives the incomplete worm gear to rotate, and the incomplete worm gear drives the upper end surface of the pitching platform to rotate along the arc-shaped guide rail pair to realize pitching movement. The detector 10 is installed on a detector slide table 11 through a detector bending plate 12, and the detector slide table 11 is installed on the optical platform 1. In this embodiment, the measured lens 4 is a transmissive optical lens or a reflective optical lens.

[0028] As Figure 2As shown, the test light path includes: first half-reflection half-transmission lens 25, first relay lens 17, second half-reflection half-transmission lens 15 and second relay lens 13 arranged in sequence along the optical axis. Wherein the first half-reflection half-transmission lens 25 is installed on the first half-reflection half-transmission lens base 23 through the first half-reflection half-transmission lens frame 22, the first half-reflection half-transmission lens base 23 is installed on the upper surface of the two-dimensional slide 24 which can displace in two orthogonal directions, and the two-dimensional slide 24 is installed on the optical platform 1; The two-dimensional slide 24 is composed of a first optical axis direction slide and a vertical optical axis direction slide; The first optical axis direction slide is fixed on the optical platform 1, the vertical optical axis direction slide is installed on the first optical axis direction slide, the first half-reflection half-transmission lens 25 is arranged above the vertical optical axis direction slide through the first half-reflection half-transmission lens base 23, and the first half-reflection half-transmission lens 25 is in an off-axis or coaxial position by moving along the optical axis direction and the vertical optical axis direction through the optical axis direction slide and the vertical optical axis direction slide to adjust the focal plane position. The first optical axis direction slide includes: a first stepper motor, a first lead screw, a first lead screw nut, a first guide rail, a first sliding block, a first base and a first table top; One end of the first lead screw is coaxially connected with the first stepper motor to drive the first lead screw to rotate, and the other end is fixed with the first base; The first base is installed on the optical platform; The first lead screw nut is installed in cooperation with the first lead screw, the first lead screw nut is fixed at the bottom of the end surface of the first table top, the first sliding block is connected with the first lead screw nut, and the first sliding block is connected with the guide rail arranged at both ends of the first base; Wherein the first optical axis direction slide and the second optical axis direction slide are completely same in structure. The vertical optical axis direction slide includes: a second stepper motor, a second lead screw, a second lead screw nut, a second guide rail, a second sliding block, a second base and a second table top; One end of the second lead screw is coaxially connected with the second stepper motor to drive the second lead screw to rotate, and the other end is fixed with the second base; The second base is installed on the first table top; The second lead screw nut is installed in cooperation with the second lead screw, the second lead screw nut is fixed at the bottom of the end surface of the second table top, the second sliding block is connected with the second lead screw nut, and the second sliding block is connected with the guide rail arranged at both ends of the second base.

[0029] The first relay lens 17 is installed on the first relay lens base 19 through the first relay lens frame 18, the first relay lens base 19 is installed on the optical platform 1; The second half-reflection half-transmission lens 15 is installed on the second half-reflection half-transmission lens base 16 through the second half-reflection half-transmission lens frame 8, the second half-reflection half-transmission lens base 16 is installed on the optical platform 1; The second relay lens 13 is installed on the second relay lens base 14 through the second relay lens frame 9, and the second relay lens base 14 is installed on the optical platform 1.

[0030] As Figure 3As shown, a partition is provided between the point light source 28 and the first semi-reflective lens 25. A first aperture 30 and a second aperture 31 are installed on the partition. The first aperture 30 is located in the optical axis direction, and the second aperture 31 is in an off-axis state. Through the first aperture 30 and the second aperture 31, the system can realize the test of the transmittance of transmissive and reflective optical lenses.

[0031] like Figure 2 As shown, the reference optical path includes: a first reflector and a second reflector disposed off-axis. The first reflector 3 is mounted on the first reflector base 2, and the first reflector base 6 is mounted on the optical platform 1; the second reflector 7 is mounted on the second reflector base 6, and the second reflector base 6 is mounted on the optical platform 1.

[0032] In addition, a mid-wave infrared lens transmittance detection device further includes a controller; the controller is connected to a first aperture 30, a second aperture 31, a two-dimensional slide 24, an axial slide 21, and a rotational pitch platform 20, respectively, and controls the opening, closing, and aperture size of the first aperture 30 and the second aperture 31, as well as the movement distance and direction of the two-dimensional slide 24, the axial slide 21, and the rotational pitch platform 20. In this embodiment, when the lens under test 4 is a transmissive optical lens, the controller controls the second aperture 31, which is set along the optical axis, to open, and controls the first aperture 30, which is set off the axis, to close. Based on the parameters of the point light source 28 and the optical system, the controller controls the movement direction and displacement of the two-dimensional slide 24, controls the displacement of the second axial slide 21, and controls the rotation angle and pitch angle of the rotational pitch platform 20.

[0033] like Figure 4 As shown, the optical path propagation direction of the optical system in a mid-wave infrared lens transmittance detection device is as follows: part of the mid-wave infrared light emitted by the point light source 28 is reflected by the first semi-reflective lens 25, the first reflector 3, the second reflector 7, and the second semi-reflective lens 15, and is received by the detector 10 after passing through the second relay mirror 13; the other part of the light is transmitted through the first semi-reflective lens 25, converged by the lens under test 4, and transmitted by the first relay mirror 17, the second semi-reflective lens 15, and the second relay mirror 13 before being received by the detector 10.

Claims

1. A mid-wave infrared lens transmittance detection device, characterized in that, The device includes: an optical platform, an optical system mounted on the optical platform, and a housing outside the optical system; the optical system includes: a point light source, a reference optical path, a lens under test, a test optical path, and a detector; the point light source, the lens under test, the test optical path, and the detector are arranged along the optical axis; the reference optical path is arranged off-axis from the point light source, the lens under test, and the detector; the detector receives light information from the reference optical path and the test optical path to detect the transmittance of the lens under test; the test optical path includes: a first semi-reflective lens, a first relay mirror, a second semi-reflective lens, and a second relay mirror arranged sequentially along the optical axis; the first semi-reflective lens is mounted on the optical platform via a two-dimensional slide; the two-dimensional slide consists of a slide along the first optical axis and a slide perpendicular to the optical axis; the lens under test is mounted on the optical platform via a second axial slide and a rotation and pitch platform to converge the transmitted light passing through the first semi-reflective lens; a partition is provided between the point light source and the first semi-reflective lens, and a first aperture and a second aperture are mounted on the partition, with the first aperture located along the optical axis and the second aperture in an off-axis state.

2. The mid-wave infrared lens transmittance detection device according to claim 1, characterized in that... The first optical axis direction slide is fixed on the optical platform, and the vertical optical axis direction slide is installed on the first optical axis direction slide, with the first optical axis direction slide and the vertical optical axis direction slide installed in an orthogonal direction; the first semi-reflective lens is disposed above the vertical optical axis direction slide through the first semi-reflective lens base, and moves along the optical axis direction and perpendicular to the optical axis direction through the first optical axis direction slide and the vertical optical axis direction slide.

3. The mid-wave infrared lens transmittance detection device according to claim 2, characterized in that, The first optical axis direction slide includes: a first stepper motor, a first lead screw, a first lead screw nut, a first guide rail, a first slider, a first base, and a first table. One end of the first lead screw is coaxially connected to the first stepper motor to drive the first lead screw to rotate, and the other end is fixed to the first base. The first base is mounted on the optical platform. The first lead screw nut is installed in conjunction with the first lead screw and is fixed to the bottom of the end face of the first table. The first slider is connected to the first lead screw nut and is connected in conjunction with the guide rails located at both ends of the first base. The vertical optical axis direction slide includes: a second stepper motor, a second lead screw, a second lead screw nut, a second guide rail, a second slider, a second base, and a second table. One end of the second lead screw is coaxially connected to the second stepper motor to drive the second lead screw to rotate, and the other end is fixed to the second base. The second base is mounted on the first table. The second lead screw nut is installed in conjunction with the second lead screw and is fixed to the bottom of the end face of the second table. The second slider is connected to the second lead screw nut and is connected in conjunction with the guide rails located at both ends of the second base.

4. The mid-wave infrared lens transmittance detection device according to claim 1, characterized in that, The second axial slide is fixed on the optical platform, and the rotation and pitch platform is mounted on the second axial slide; the lens under test is mounted on the rotation and pitch platform.

5. The mid-wave infrared lens transmittance detection device according to claim 4, characterized in that, The rotary pitch platform consists of a rotary platform and a pitch platform. The rotary platform includes an end cover, a worm gear, and a worm shaft that work together to achieve the rotation. The worm shaft is manually adjusted to rotate, which in turn drives the worm gear meshing with it to rotate, and the worm gear drives the upper end cover to rotate. The pitch platform is mounted on the end cover and includes a worm gear pair, an upper end face, a bottom surface, an arc-shaped guide rail slider, and an arc-shaped guide rail. The upper end face is mounted on a partially worm gear, and the arc-shaped guide rail slider is mounted on the upper end face, which meshes with the arc-shaped guide rail mounted on the bottom surface. Adjusting the worm shaft mounted on the bottom surface of the pitch platform causes it to rotate, which in turn drives the partially worm gear to rotate. The partially worm gear drives the upper end face of the pitch platform to rotate along the arc-shaped guide rail pair, thus achieving the pitch motion.

6. The mid-wave infrared lens transmittance detection device according to claim 1, characterized in that, The reference optical path includes a first reflecting mirror and a second reflecting mirror positioned off the optical axis.

7. The mid-wave infrared lens transmittance detection device according to claim 1, characterized in that, The mid-wave infrared light emitted by the point light source is reflected by the first half-reflecting lens, the first mirror, the second mirror, and the second half-reflecting lens, and then received by the detector after passing through the second relay mirror; the other part of the light is transmitted through the first half-reflecting lens, converged by the lens under test, and then transmitted through the first relay mirror, the second half-reflecting lens, and the second relay mirror before being received by the detector.

8. The mid-wave infrared lens transmittance detection device according to claim 1, characterized in that, It also includes a controller; the controller is connected to the first aperture, the second aperture, the two-dimensional slide, the second axial slide and the rotary pitch platform respectively, and controls the opening, closing and aperture size of the first aperture and the second aperture, and controls the movement distance and movement direction of the two-dimensional slide, the second axial slide and the rotary pitch platform.

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