Energetic material laser sensitivity testing device

Abstract

The utility model discloses an energetic material laser sensitivity testing device, which comprises a testing unit, a laser unit, an infrared thermometer and a high-speed image pickup system, and is characterized in that the testing unit comprises a protection box, a sample seat arranged in the protection box, and an electric displacement table arranged in the protection box and used for controlling the sample seat to ascend and descend; the laser unit comprises a laser, a laser modulator, an optical fiber and a laser collimator, the laser is connected with the input end of the laser modulator, the laser collimator penetrates through the top of the protection box, and the output end of the laser modulator is connected with the input end of the laser collimator through the optical fiber; the infrared thermometer comprises an infrared temperature measurement probe located in the protection box and a temperature display located outside the protection box, and the high-speed camera system is located outside the protection box. The high-speed camera system with the brightness automatic triggering function is adopted, the image during ignition can be automatically collected according to the brightness generated after the sample is ignited, and therefore sample ignition judgment is carried out, and the method is more objective and accurate compared with traditional personnel observation judgment.

Description

Technical Field

[0001] The utility model relates to the technical field of laser method testing devices, in particular to a laser sensitivity testing device for energetic materials. Background Art

[0002] The laser sensitivity of energetic materials, similar to their sensitivities to static electricity, friction, and impact, is a crucial parameter for assessing the safety performance of energetic materials. Electrons in materials irradiated by laser light undergo forced vibrations and radiate secondary waves under the influence of the laser's electric field, further contributing to energy transfer and diffusion. When the laser power density is low, the laser energy absorbed by the material is converted into heat, generating a localized high-temperature zone within the energetic material known as a hotspot. This hotspot not only possesses a small volume and high thermal energy density but also serves as the initial zone of intense reaction within the energetic material. Clearly, energetic materials that readily form hotspots under laser light tend to have higher laser sensitivity.

[0003] During the production of energetic materials, laser equipment is required, such as for particle size measurement, monitoring the continuous or intermittent process of liquid or solid materials, monitoring crystallization processes, and spectral measurements, which brings certain safety risks. Therefore, testing the laser sensitivity of energetic materials is of great significance for the research, production, testing, and obtaining the physical and chemical properties of energetic materials. At present, there are few molding devices for laser sensitivity testing of energetic materials. Most laser sensitivity tests are open-type, with large equipment footprints and high operating risks, which are not conducive to sensitivity testing. At the same time, the ignition criteria for energetic materials are mostly subjective factors such as explosion sounds, light emission, smoke, and burn marks, which cannot objectively reflect the actual ignition state and directly affect the test results. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a laser sensitivity testing device for energetic materials.

[0005] The above technical objectives of the present utility model are achieved through the following technical solutions: a laser sensitivity testing device for energetic materials, comprising a testing unit, a laser unit, an infrared thermometer and a high-speed camera system, wherein the testing unit comprises a protective box, a sample holder arranged in the protective box, and an electric translation stage arranged in the protective box and used to control the lifting and lowering of the sample holder; the laser unit comprises a laser, a laser modulator, an optical fiber and a laser collimator; the laser is connected to the input end of the laser modulator, the laser collimator is arranged through the top of the protective box, the optical fiber connects the output end of the laser modulator to the input end of the laser collimator; the infrared thermometer comprises an infrared temperature measuring probe located in the protective box and a temperature display located outside the protective box; and the high-speed camera system is located outside the protective box.

[0006] Furthermore, the collimation distance of the laser collimator is ≥20 cm, the collimation spot diameter is <10 mm, and the divergence angle is <18 mrad.

[0007] Furthermore, the protective box is a box body made of transparent organic glass with a thickness of 1.5-2 mm.

[0008] Furthermore, the electric translation stage includes a base fixed to the bottom wall of the protective box, a threaded rod rotatably mounted on the base and horizontally arranged, a driving motor fixed to the bottom wall of the protective box and used to drive the threaded rod, a fixed block fixed to the top of the base, an X-shaped bracket hinged on the fixed block, and a sliding block sleeved on the threaded rod and threadedly connected to the threaded rod, the X-shaped bracket is provided with two and symmetrically arranged, the threaded rod away from the driving motor is rotatably connected to the fixed block, the lower end of the X-shaped bracket away from the fixed block is hinged to the side wall of the sliding block, the upper end of the X-shaped bracket close to the fixed block is hinged to a horizontally arranged lifting platform, a slide rail arranged parallel to the threaded rod is fixed to the bottom of the lifting platform, an upper slider is slidably mounted on the slide rail, the upper end of the X-shaped bracket away from the fixed block is hinged to the side wall of the upper slider, and the sample holder is arranged at the top of the lifting platform.

[0009] Furthermore, the lifting platform is provided with a fixing plate detachably connected to the lifting platform via bolts, the cross section of the fixing plate is L-shaped, and two fixing plates are provided and symmetrically distributed on both sides of the sample holder.

[0010] In summary, the present invention has the following beneficial effects:

[0011] 1. In this application, the laser unit is an independent module, and different lasers can be replaced according to the requirements of laser tests with different wavelengths;

[0012] 2. In this application, the position of the sample holder is controlled by an electric translation stage, which is easy to operate and accurately adjusts the position, ensuring that the emitted laser can accurately act on the sample, saving personnel adjustment time;

[0013] 3. This application uses an infrared thermometer to test the temperature rise of the sample under the action of laser irradiation, which can effectively record the reaction temperature of the test sample under laser stimulation, which also provides a basis for judging the response of the sample;

[0014] 4. The utility model adopts a high-speed camera system with automatic triggering of light brightness, which can automatically capture images of the ignition according to the light generated by the sample after ignition, so as to make judgments on the ignition of the sample, which is more objective and accurate than traditional human observation and judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0016] Figure 2 It is a workflow diagram of an embodiment of the utility model;

[0017] Figure 3 This is a schematic structural diagram of a protective box in an embodiment of the present utility model;

[0018] Figure 4 This is a schematic diagram of the structure of an embodiment of the utility model for highlighting the electric translation stage;

[0019] Figure 5 yes Figure 4 Enlarged schematic diagram of point A in the middle.

[0020] In the figure: 1. Protective box; 2. Laser collimator; 3. Infrared thermometer; 4. Fixing plate; 5. Sample holder; 6. Electric translation stage; 61. Base; 62. Threaded rod; 63. Drive motor; 64. Fixing block; 65. X-shaped bracket; 66. Sliding block; 7. Fixing screw; 8. Optical fiber; 9. Laser; 10. Laser modulator; 11. High-speed camera system; 12. Motor controller; 13. Through hole; 14. Sleeve; 15. Lifting platform; 16. Slide rail; 17. Upper slider. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; it is obvious that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0022] like Figure 1-5 As shown, the embodiment of the present application discloses a laser sensitivity testing device for energetic materials, including a testing unit, a laser unit, an infrared thermometer 3 and a high-speed camera system 11. The testing unit includes a protective box 1, a sample holder 5 arranged in the protective box 1, and an electric translation stage 6 arranged in the protective box 1 and used to control the lifting and lowering of the sample holder 5. The laser unit includes a laser 9, a laser modulator 10, an optical fiber 8 and a laser collimator 2. The laser 9 is connected to the input end of the laser modulator 10, and the laser collimator 2 is arranged through the top of the protective box 1. The optical fiber 8 connects the output end of the laser modulator 10 to the input end of the laser collimator 2. The infrared thermometer 3 includes an infrared temperature measuring probe located in the protective box 1 and a temperature display located outside the protective box 1. The high-speed camera system 11 is located outside the protective box 1.

[0023] In this embodiment, the laser collimator 2 is fixed to the protective box 1 by a fixing screw 7. Specifically: a through hole 13 for the laser collimator 2 to pass through is provided on the protective box 1, and a sleeve 14 is fixed on the top wall of the protective box 1 near the through hole 13 and is sleeved on the outside of the laser collimator 2. A fixing screw 7 connected to the screw thread is provided on the sleeve 14, and the end of the fixing screw 7 is pressed against the side wall of the laser collimator 2.

[0024] A specific application of this embodiment involves placing an appropriate amount of sample on the sample holder 5 before the test begins, adjusting the position of the laser collimator 2, and setting up the infrared thermometer 3 and high-speed camera system 11. Laser 9 outputs laser light, which is transmitted to the laser collimator 2 via optical fiber 8. A laser modulator 10 is used to control the laser's output power P and output time T. In this embodiment, lasers 9 of different wavelengths can be selected and replaced based on test requirements. The laser collimator 2 has a collimation distance of ≥20 cm, a collimated spot diameter of <10 mm, and a divergence angle of <18 mrad.

[0025] To facilitate high-speed camera system 11 capturing the test process within protective box 1, the protective box 1 is constructed of transparent organic glass with a thickness of 1.5-2 mm. High-speed camera system 11, automatically triggered by light intensity, automatically captures images of the sample during ignition based on the brightness of the sample. Combined with infrared thermometer 3, the temperature of the sample under laser stimulation is recorded to determine if the sample has ignited.

[0026] The electric translation stage 6 includes a base 61 fixed on the inner bottom wall of the protective box 1, a threaded rod 62 rotatably mounted on the base 61 and arranged horizontally, a drive motor 63 fixed on the inner bottom wall of the protective box 1 and used to drive the threaded rod 62, a fixed block 64 fixed on the top of the base 61, an X-shaped bracket 65 hinged on the fixed block 64, and a sliding block 66 sleeved on the threaded rod 62 and threadedly connected to the threaded rod 62. The X-shaped bracket 65 is provided with two and symmetrically arranged, and the threaded rod 62 is away from the drive motor 63. One end is rotatably connected to the fixed block 64. The lower end of the X-shaped bracket 65, away from the fixed block 64, is hinged to the side wall of the sliding block 66. The upper end of the X-shaped bracket 65, close to the fixed block 64, is hinged to a horizontally arranged lifting platform 15. A slide rail 16 arranged parallel to the threaded rod 62 is fixed to the bottom of the lifting platform 15. An upper slider 17 is slidably mounted on the slide rail 16. The upper end of the X-shaped bracket 65, away from the fixed block 64, is hinged to the side wall of the upper slider 17. The sample holder 5 is disposed on the top of the lifting platform 15. The lifting platform 15 is provided with a fixing plate 4, which is detachably connected to the lifting platform 15 via bolts (not shown in the figure). The cross-section of the fixing plate 4 is L-shaped, and two fixing plates 4 are provided and symmetrically distributed on both sides of the sample holder 5.

[0027] In this embodiment, an infrared ceramic plate is used to sense the laser to obtain the position of the emitted laser, and a mark is made on the electric translation stage 6. The sample holder 5 is placed at the marked position and fixed in position by the fixing plate 4. A motor controller 12 electrically connected to the drive motor 63 is provided on the outside of the protective box 1. The motor controller 12 can be used to drive and control the electric translation stage 6 to move up and down to a specified position. Specifically, after the drive motor 63 is turned on, it drives the threaded rod 62 to rotate. Since the threaded rod 62 is threadedly connected to the sliding block 66, the two sides of the sliding block 66 are respectively hinged to the lower ends of the two X-shaped brackets 65 away from the fixed block 64. The upper ends of the two X-shaped brackets 65 away from the fixed block 64 are hinged to the upper slider 17. The upper slider 17 slides with the slide rail 16 at the bottom of the lifting platform 15, so that the lifting platform 15 can be raised and lowered, so that the staff can control the electric translation stage 6 to move up and down to the specified position through the motor drive of the motor controller 12.

[0028] In this embodiment, the laser power density U (J / cm 2 ) is used as a parameter to characterize the laser sensitivity of energetic materials, as shown in the following formula, where P is the output power of the laser, S spot is the spot area, and Tfly is the time the laser acts on the sample.

[0029] U=(P / S 光斑 )×T fly

[0030] In summary, the embodiment of the utility model provides a laser sensitivity testing device for energetic materials, in which the laser unit is an independent module and the laser 9 can be replaced according to the requirements of laser tests of different wavelengths; the position of the sample holder 5 is controlled by an electric translation stage 6, which is easy to operate and can accurately adjust the position, thereby ensuring that the emitted laser can accurately act on the sample and saving personnel adjustment time; an infrared thermometer 3 is used to test the irradiation temperature rise of the sample under the action of the laser, which can effectively record the reaction temperature of the test sample under laser stimulation; a high-speed camera system 11 is used to automatically capture images of the sample during ignition based on the brightness generated after the sample ignites, thereby making a judgment on the ignition of the sample, which is more objective and accurate than the traditional judgment by personnel observation.

[0031] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A laser sensitivity testing device for energetic materials, characterized by: The invention comprises a test unit, a laser unit, an infrared thermometer (3) and a high-speed camera system (11). The test unit comprises a protective box (1), a sample holder (5) arranged in the protective box (1), and an electric displacement stage (6) arranged in the protective box (1) and used for controlling the lifting of the sample holder (5). The laser unit comprises a laser (9), a laser modulator (10), an optical fiber (8) and a laser collimator (2). The laser (9) is connected to the input end of the laser modulator (10). The laser collimator (2) is arranged through the top of the protective box (1). The optical fiber (8) connects the output end of the laser modulator (10) to the input end of the laser collimator (2). The infrared thermometer (3) comprises an infrared temperature measuring probe located in the protective box (1) and a temperature display located outside the protective box (1). The high-speed camera system (11) is located outside the protective box (1).

2. The device for testing laser sensitivity of energetic materials according to claim 1, wherein: The laser collimator (2) has a collimation distance of ≥20 cm, a collimation spot diameter of <10 mm, and a divergence angle of <18 mrad.

3. The laser sensitivity testing device for energetic materials according to claim 1, wherein: The protective box (1) is a box body made of transparent organic glass, and its thickness is 1.5-2 mm.

4. The laser sensitivity testing device for energetic materials according to claim 1, wherein: The electric translation stage (6) comprises a base (61) fixed on the inner bottom wall of the protection box (1), a threaded rod (62) rotatably mounted on the base (61) and arranged horizontally, a driving motor (63) fixed on the inner bottom wall of the protection box (1) and used to drive the threaded rod (62), a fixing block (64) fixed on the top of the base (61), an X-shaped bracket (65) hinged on the fixing block (64), and a sliding block (66) sleeved on the threaded rod (62) and threadedly connected to the threaded rod (62), wherein the X-shaped bracket (65) is provided with two and symmetrically arranged, and the threaded rod (62) is away from the driving motor (63). ) is rotatably connected to the fixed block (64), the lower end of the X-shaped bracket (65) away from the fixed block (64) is hinged to the side wall of the sliding block (66), the upper end of the X-shaped bracket (65) close to the fixed block (64) is hinged to a horizontally arranged lifting platform (15), a slide rail (16) arranged parallel to the threaded rod (62) is fixed to the bottom of the lifting platform (15), an upper slider (17) is slidably mounted on the slide rail (16), the upper end of the X-shaped bracket (65) away from the fixed block (64) is hinged to the side wall of the upper slider (17), and the sample holder (5) is arranged on the top of the lifting platform (15).

5. The laser sensitivity testing device for energetic materials according to claim 4, characterized in that: The lifting platform (15) is provided with a fixing plate (4) which is detachably connected to the lifting platform (15) via bolts. The cross section of the fixing plate (4) is L-shaped. Two fixing plates (4) are provided and symmetrically distributed on both sides of the sample holder (5).

Images