A multifunctional photoelectric energy detection system with large dynamic range

Abstract

The invention relates to a photoelectric energy detection system. Aiming at the problems that the existing photoelectric energy detection unit has a small dynamic range, a single function, and is easy to physically interfere with the optical system structure, a multifunctional photoelectric energy detection system with a large dynamic range is provided. The detection system comprises a detector power supply, a signal acquisition module, a three-axis electric-controlled displacement platform, and an integrating sphere assembly fixedly arranged on the three-axis electric-controlled displacement platform; the integrating sphere assembly comprises an integrating sphere body, an optical signal guiding tube and a photoelectric energy detection unit; one end of the optical signal guiding tube is arranged at the light entrance of the integrating sphere body, and its axis is parallel to the axis of the light entrance of the integrating sphere body, and the other end is arranged with a steel star point plate; the steel star point plate is a cover body with a central opening, and the steel star point plate is buckled on the end of the front end guiding tube; the photoelectric energy detection unit is arranged at the light exit of the integrating sphere body, and the photoelectric energy detection unit is electrically connected to the detector power supply and the signal acquisition module.

Description

Technical Field

[0001] The invention relates to a photoelectric energy detection system, in particular to a multifunctional photoelectric energy detection system with a large dynamic range. Background Art

[0002] In recent years, with the increasing demand for optical systems (such as star sensors, airborne cameras, etc.) in aerospace and aviation products, the number of test indicators has also increased one by one.

[0003] In order to determine whether the product performance indicators meet the research and development requirements, it has basically become a must-test item for various optical systems to obtain the product's ability to suppress stray light through stray light testing, obtain the product's light loss ratio through transmittance testing, and obtain whether the light intensity distribution of the product imaging is uniform through illumination uniformity testing.

[0004] However, the existing photoelectric energy detection unit has a small detection dynamic range and a single function (it can only test one of the technical indicators such as stray light, transmittance, and illumination uniformity). In addition, due to its unreasonable structural design, it is easy to physically interfere with the structure of the optical system, making it difficult to meet actual usage requirements.

[0005] Therefore, it is necessary to develop a photoelectric energy detection system with a large dynamic range, diverse functions and a wide range of applicable products. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of existing photoelectric energy detection units, such as small dynamic range, single function, and easy physical interference with the optical system structure, and to provide a multifunctional photoelectric energy detection system with a large dynamic range. The detection system can be applied to the detection of various optical systems, especially for optical systems with complex back-end structures, where general detection units are prone to physical interference, resulting in the inability to measure stray light coefficient, transmittance, and illumination uniformity.

[0007] To achieve the above purpose, the technical solution provided by the present invention is: a multifunctional photoelectric energy detection system with a large dynamic range, which is special in that it includes a detector power supply, a signal acquisition module, a three-axis electric-controlled displacement platform, and an integrating sphere assembly fixedly arranged on the three-axis electric-controlled displacement platform; the integrating sphere assembly includes an integrating sphere body, an optical signal guide tube and a photoelectric energy detection unit; one end of the optical signal guide tube is arranged at the light inlet of the integrating sphere body, and its axis is parallel to the axis of the light inlet of the integrating sphere body, and a steel star point plate is arranged at the other end; the steel star point plate is a cover body with a central opening, and the steel star point plate is buckled on the end of the front guide tube; the photoelectric energy detection unit is arranged at the light outlet of the integrating sphere body, and the photoelectric energy detection unit is electrically connected to the detector power supply and the signal acquisition module. The detector power supply is used to supply power to the photoelectric energy detection unit, and the signal acquisition module receives the signal from the photoelectric energy detection unit.

[0008] Furthermore, a variable iris for adjusting the energy of the incident light beam entering the integrating sphere is provided between the optical signal guide tube and the light inlet of the integrating sphere body. The variable iris can effectively change the energy of the incident light entering the integrating sphere without affecting the test spectrum, thereby increasing the dynamic range of the photoelectric energy detection system. If the selected variable iris can be adjusted from a smaller R1 to a larger R2, then its adjustable dynamic range is R 2 2 / R 1 2 .

[0009] Furthermore, the optical signal guide tube comprises a front guide tube and a rear guide tube which are coaxial and detachably connected; the rear guide tube is a hollow cylindrical structure, and the rear guide tube is arranged at the light entrance of the integrating sphere body; the front guide tube is a hollow cone structure, and its large end is connected to the rear guide tube. The conical structure of the front guide tube can minimize the diameter of the steel star point template, further increasing the applicable surface of the detection system.

[0010] Furthermore, the end of the front guide tube is fixed with a magnet for attracting and fixing the steel star point plate. The steel star point template is fixedly connected to the front guide tube by the suction force of the magnet, and the steel star point plate can be quickly replaced by simply plugging and pulling; compared with the general threaded fixing method, it is very convenient and fast, greatly improving the test efficiency of the optical system.

[0011] Furthermore, in order to more firmly adsorb the steel star point template, the magnet is an annular magnet, and the end of the front guide tube is concave to form a mounting groove, and the annular magnet is embedded in the mounting groove.

[0012] Furthermore, a light outlet is symmetrically arranged on both sides of the integrating sphere body, and a photoelectric energy detection unit is arranged at each light outlet.

[0013] Furthermore, the above-mentioned photoelectric energy detection unit is a photoelectric detector.

[0014] Furthermore, the above-mentioned photoelectric energy detection unit is a silicon-based detector or an indium gallium arsenic detector.

[0015] Furthermore, the front end guide tube and the rear end guide tube are connected via threads.

[0016] The advantages of the present invention are:

[0017] 1. The present invention adopts a light signal guide tube extending forward, which can be extended into some optical systems with complex rear-end structures of optical systems, avoiding interference between the detection system and the structure, making it applicable to a wider range of optical devices to be tested.

[0018] 2. Compared with the existing technology for adjusting the brightness of light sources, the brightness range of light sources is limited by installing an aperture in front of the light source, and adjusting the voltage and current of the light source will change the test spectrum range, affecting the test results. The present invention sets a variable aperture between the rear guide tube and the light inlet of the integrating sphere body, and cooperates with the aperture in front of the light source to effectively change the incident light energy entering the integrating sphere without affecting the test spectrum, thereby increasing the dynamic range of the photoelectric energy detection system.

[0019] 3. The present invention embeds a magnet at the end of the front guide tube, and the steel star point plate is fixedly connected to the front guide tube through the suction force of the magnet. The steel star point plate can be quickly replaced by simply plugging and pulling. Compared with the general threaded fixing method, it is very convenient and fast, and can greatly improve the test efficiency of the optical system.

[0020] 4. The present invention adopts a three-axis electric-controlled translation stage, which can accurately adjust the position of the light entrance of the detection system, facilitate the position adjustment in the stray light coefficient and transmittance test, and can also make the light entrance of the detection system perform two-dimensional scanning at the image plane position of the optical system to realize the detection of the illumination uniformity of the optical system; it has the advantages of large dynamic range, diverse functions and wide applicable products. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the photoelectric energy detection system of the present invention;

[0022] Figure 2 is a cross-sectional view of an integrating sphere assembly according to a first embodiment of the present invention;

[0023] Figure 3 yes Figure 2 Exploded schematic diagram of the integrating sphere assembly (variable aperture and integrating sphere body omitted);

[0024] Figure 4 yes Figure 3 Schematic diagram of the assembly of the medium light signal guide tube and the steel star point plate;

[0025] Figure 5 yes Figure 4 A cross-sectional view of the middle front end guide tube;

[0026] Figure 6 yes Figure 4 Cross-sectional view of the steel star point plate;

[0027] Figure 7 It is a schematic diagram of the connection structure between the optical signal guide tube and the steel star point plate in the second embodiment of the present invention.

[0028] The descriptions of the numbers in the figure are as follows:

[0029] 1—Three-axis electronically controlled translation stage;

[0030] 2—Integrating sphere assembly;

[0031] 21 - integrating sphere body, 22 - variable aperture, 23 - optical signal guide tube, 231 - rear end guide tube, 232 - front end guide tube, 233 - annular magnet, 24 - photoelectric energy detection unit, 25 - steel star point plate;

[0032] 3—Power box. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] Embodiment 1

[0035] like Figure 1 As shown, this embodiment provides a multifunctional photoelectric energy detection system with a large dynamic range, including a three-axis electric-controlled translation stage 1, an integrating sphere assembly 2 and a power supply box 3 fixedly arranged on the three-axis electric-controlled translation stage 1, and a detector power supply and a signal acquisition module are installed in the power supply box 3. The signal acquisition module adopts a NI9215BNC 4-channel AI module and is adapted to a NICDAQ-9181 Ethernet chassis.

[0036] See also Figure 1 , Figure 2 The integrating sphere assembly 2 includes an integrating sphere body 21, a variable aperture 22, an optical signal guide tube 23 and a photoelectric energy detection unit 24; the model of the variable aperture 22 in this embodiment is Saifan Optoelectronics 7MD122.

[0037] like Figures 2 to 5 As shown, the optical signal guide tube 23 includes a front guide tube 232 and a rear guide tube 231 which are coaxial and connected by threads. The rear guide tube 231 is a hollow cylindrical structure; the front guide tube 232 is a hollow cone structure, and its large end is sleeved on the end of the rear guide tube 231. The rear guide tube 231 is arranged at the light entrance of the integrating sphere body 21 through a flange, and its axis is parallel to the axis of the light entrance of the integrating sphere body 21; the end of the front guide tube 232 is concave to form a mounting groove, and the mounting groove is embedded with a ring magnet 233 for attracting and fixing the steel star point plate 25. See Figure 6 The steel star point plate 25 is a conical cover body with a central opening, and is mounted on the front end guide cylinder 232 through the magnetic buckle of the annular magnet 233.

[0038] The variable aperture 22 is disposed between the rear end guide tube 231 and the light entrance of the integrating sphere body 21 and is used to adjust the energy of the incident light beam of the integrating sphere.

[0039] There are two photoelectric energy detection units 24, which are fixedly arranged at the light outlets on both sides of the integrating sphere body 21; one of the photoelectric energy detection units 24 uses a silicon-based detector, and the other photoelectric energy detection unit 24 uses an indium gallium arsenide detector. The photoelectric energy detection unit 24 is electrically connected to the detector power supply and signal acquisition module in the power box 3.

[0040] The variable aperture selected in this embodiment can be selected from Adjust to Adjustable dynamic range is 20 2 / 1 2 =400; the small end diameter of the front guide tube 232 of the optical signal guide tube 23 is 15mm, which can penetrate into the complex optical system at the rear end; the light aperture of the front guide tube 232 is The aperture of the replaceable large aperture is The system is equipped with a three-axis electric-controlled translation stage, and each axis has a travel of 200 mm.

[0041] Embodiment 2

[0042] This embodiment provides a multifunctional photoelectric energy detection system with a large dynamic range, including a three-axis electric-controlled translation stage 1, an integrating sphere assembly 2 and a power supply box 3 fixedly arranged on the three-axis electric-controlled translation stage 1, and a detector power supply and a signal acquisition module are installed in the power supply box 3. The signal acquisition module adopts an NI 9215BNC 4-channel AI module and is adapted to an NI CDAQ-9181 Ethernet chassis.

[0043] The integrating sphere assembly 2 includes an integrating sphere body 21, a variable aperture 22, an optical signal guide tube 23 and a photoelectric energy detection unit 24. In this embodiment, the variable aperture 22 adopts the model of Saifan Optoelectronics 7MD122.

[0044] like Figure 7 As shown, unlike the first embodiment, the optical signal guide tube 23 of this embodiment does not include the front guide tube 232, and does not have the tapered section transition of the front guide tube 232 in the first embodiment, and is always a hollow straight cylinder structure. The optical signal guide tube 23 of this hollow straight cylinder structure has a large light entrance hole diameter, which can match an aperture with a larger light aperture, so that the detection system can be applied to more optical systems to be tested.

[0045] One end of the optical signal guide tube 23 is arranged at the light entrance of the integrating sphere body 21 through a flange, and its axis is parallel to the axis of the light entrance of the integrating sphere body 21; the other end is directly buckled with a steel star point plate 25 of an end cover structure with a central opening. The variable aperture 22 is arranged between the rear end guide tube 231 and the light entrance of the integrating sphere body 21, and is used to adjust the energy of the incident light beam of the integrating sphere.

[0046] There are two photoelectric energy detection units 24, which are fixedly arranged at the light outlets on both sides of the integrating sphere body 21; one of the photoelectric energy detection units 24 uses a silicon-based detector, and the other photoelectric energy detection unit 24 uses an indium gallium arsenide detector. The photoelectric energy detection unit 24 is electrically connected to the detector power supply and signal acquisition module in the power box 3.

[0047] The above is only a description of the preferred implementation mode of the present invention, and the technical solution of the present invention is not limited thereto. Any known deformation made by those skilled in the art on the basis of the main technical concept of the present invention belongs to the technical scope to be protected by the present invention.

Claims

1. A multifunctional photoelectric energy detection system with a large dynamic range, characterized in that: It comprises a detector power supply, a signal acquisition module, a three-axis electric-controlled displacement platform (1), and an integrating sphere assembly (2) fixedly arranged on the three-axis electric-controlled displacement platform (1); The integrating sphere assembly (2) comprises an integrating sphere body (21), an optical signal guide tube (23), a photoelectric energy detection unit (24) and a steel star point plate (25); The optical signal guide tube (23) comprises a front guide tube (232) and a rear guide tube (231) which are coaxial and detachably connected; The rear end guide tube (231) is a hollow cylindrical structure, and the rear end guide tube (231) is arranged at the light entrance of the integrating sphere body (21), and its axis is parallel to the axis of the light entrance of the integrating sphere body (21); The front guide tube (232) is a hollow cone structure, and its large end is connected to the rear guide tube (231); The steel star point plate (25) is a cover body with a central opening, and the steel star point plate (25) is buckled and mounted on the end of the front guide tube (232); The photoelectric energy detection unit (24) is arranged at the light outlet of the integrating sphere body (21), and the photoelectric energy detection unit (24) is electrically connected to a detector power supply and a signal acquisition module.

2. A multifunctional photoelectric energy detection system with a large dynamic range according to claim 1, characterized in that: A variable diaphragm (22) for adjusting the energy of the incident light beam of the integrating sphere is arranged between the optical signal guiding tube (23) and the light entrance of the integrating sphere body (21).

3. A multifunctional photoelectric energy detection system with a large dynamic range according to claim 2, characterized in that: The end of the front guide tube (232) is fixedly provided with a magnet for attracting and fixing the steel star point plate (25).

4. A multifunctional photoelectric energy detection system with a large dynamic range according to claim 3, characterized in that: The magnet is an annular magnet (233), and the end of the front guide tube (232) is concave to form a mounting groove, in which the annular magnet (233) is embedded.

5. A multifunctional photoelectric energy detection system with a large dynamic range according to claim 4, characterized in that: A light outlet is symmetrically arranged on both sides of the integrating sphere body (21), and each light outlet is provided with a photoelectric energy detection unit (24).

6. A multifunctional photoelectric energy detection system with a large dynamic range according to claim 5, characterized in that: The photoelectric energy detection unit (24) is a photoelectric detector.

7. A multifunctional photoelectric energy detection system with a large dynamic range according to claim 5, characterized in that: The photoelectric energy detection unit (24) is a silicon-based detector or an indium gallium arsenic detector.

8. A multifunctional photoelectric energy detection system with a large dynamic range according to claim 7, characterized in that: The front end guide tube (232) and the rear end guide tube (231) are connected via threads.

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