Dynamic loading force thermal synchronous measurement device for energetic material

Abstract

The invention discloses an energetic material dynamic loading force and heat synchronous measuring device, and belongs to the field of energetic material force and heat in-situ experiment characterization under dynamic loads. The device comprises a multi-array high-speed infrared measurement module, a high-speed visible light measurement module, a two-way light splitting module and a dynamic loading module. Synchronous shooting of the high-speed infrared measurement instrument and the visible light camera is achieved through the light splitting module, the temperature rise of the energetic material is measured through the multi-array high-speed infrared measurement module, multi-frame infrared super-resolution measurement is achieved through multiple arrays, and deformation of the energetic material is measured through the high-speed visible light module. And dynamic loading deformation and temperature synchronous measurement of the energetic material is realized. The infrared visible light space synchronous positioning mark is manufactured by adopting laser to etch the micropores and filling a low-infrared-emissivity material, so that the infrared visible light picture space synchronization is realized. According to the system, hot spot positioning, deformation and temperature rise evolution time-space synchronous measurement under the dynamic load of the energetic material can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of energetic material dynamic loading force thermal synchronous measurement device, especially to a kind of based on split Hopkinson pressure bar (SHPB) realization dynamic loading, high-speed visible light measurement module realizes deformation field measurement, multi-array infrared measurement module realizes temperature field super-resolution measurement, two-way light splitting module and infrared \ visible light dual-band mark realize synchronous deformation \ temperature synchronous measurement, belong to the field of energetic material force thermal in-situ experiment under dynamic load. BACKGROUND

[0002] The mechanical response characteristics and hot spot initiation mechanism of energetic materials under dynamic load are an important research topic, which has important scientific significance and engineering practical value for ensuring the safety of energetic material production and application. Under dynamic load, energetic materials produce friction, plastic deformation and other dissipation mechanisms, causing local severe temperature rise to form "hot spots", which ultimately lead to ignition of energetic materials. Therefore, it is necessary to carry out dynamic load force thermal synchronous measurement experiment of energetic materials to further study the ignition mechanism of energetic materials under dynamic load.

[0003] The "hot spot" of energetic materials under dynamic load has short duration and small spatial size (10 1 ~ 10 2 μs, 10 1 ~ 10 2 μm). Therefore, a high temporal and spatial resolution temperature measurement system is needed to realize the positioning and temperature evolution process measurement of hot spot. SUMMARY

[0004] To solve the problems of high-speed infrared measurement system under dynamic loading force thermal synchronous measurement of energetic materials: insufficient spatial resolution, deformation and temperature time and space synchronous measurement. The main purpose of the present application is to provide a kind of energetic material dynamic loading force thermal synchronous measurement device, based on multi-array high-speed infrared measurement system and high-speed visible light camera, through two-way light splitting module to realize deformation and temperature synchronous measurement. Through infrared \ visible light dual-band spatial positioning mark, temperature information space synchronization is realized. Through sub-pixel offset multi-array and convex set projection algorithm, multi-frame infrared super-resolution is realized, which is used for ignition mechanism analysis of energetic materials under dynamic load.

[0005] The purpose of the present application is realized by the following technical scheme:

[0006] The present application discloses a kind of energetic material dynamic loading force thermal synchronous measurement device, including multi-array high-speed infrared temperature measurement module, high-speed visible light measurement module, two-way light splitting module and energetic material dynamic loading module.

[0007] The multi-array high-speed infrared temperature measurement module and high-speed visible light measurement module are arranged on both sides of the energetic material dynamic loading module.

[0008] The bivectorial light splitting module is located at the intersection of the observation axis of the high-speed visible light measuring module and the loading axis of the dynamic loading module.

[0009] The high-speed infrared temperature measuring module comprises an infrared light path and a high-speed infrared detector.

[0010] The high-speed visible light measuring module comprises a high-speed camera, a lens and a laser lamp.

[0011] The bivectorial light splitting module is used to transmit the infrared light and the visible light radiated by the object surface to the multi-array high-speed infrared temperature measuring module and the high-speed visible light measuring module respectively, so as to obtain the infrared and visible light pictures simultaneously. The bivectorial light splitting module comprises a dichroic mirror, an adjusting device and a reflecting mirror. The dichroic mirror reflects the visible light in the wavelength band of 460nm-760nm in the light radiated and reflected by the tested object, and the reflectivity is above 85%. The dichroic mirror also filters the light interference entering the infrared detector through the optical system. The plane reflecting mirror is used to reflect the visible light reflected by the dichroic mirror to the high-speed camera, and the reflectivity is above 90%.

[0012] The dynamic loading module of the energetic material comprises a split Hopkinson pressure bar and a charging platform. The charging platform comprises an impact base and a sapphire observation window. The impact base is a steel cylinder, and a counterbore is arranged at the bottom for mounting the sapphire observation window. The sapphire observation window is used to apply the pressure-shear load to the energetic material together with the incident rod and transmit the infrared radiation signal to the bivectorial light splitting module.

[0013] Further, the multi-array high-speed infrared temperature measuring module comprises a second high-speed infrared detector, an infrared light path and a high-precision translation stage.

[0014] The high-speed infrared detector comprises 64*64 pixels, and can continuously shoot 100 infrared pictures at a frame rate of 1MHz.

[0015] The infrared light path is composed of one 50\50 infrared light splitter and two infrared lenses, the 50\50 infrared light splitter is used for splitting the infrared radiation signal transmitted by the two-way light splitting module into two parts, reflecting the infrared light into the first high-speed infrared detector, and transmitting the infrared light into the second high-speed infrared detector.

[0016] The high-precision translation table is used for sub-pixel level imaging position adjustment, and the two high-speed infrared detectors capture two light fields with sub-pixel jitter.

[0017] Further, the high-speed infrared measuring instrument and the visible light camera are synchronously photographed by using the light splitting module, the temperature rise of the energetic material is measured by the infrared temperature measuring module, the temperature information space is synchronized, the deformation of the energetic material is measured based on the high-speed visible light module, and the multi-array scheme is used to realize multi-frame infrared super-resolution measurement.

[0018] Further, the multi-frame infrared super-resolution is realized by the sub-pixel bias multi-array and the convex set projection algorithm.

[0019] The application also discloses an infrared\visible light dual-band space positioning mark method, which is realized based on the energetic material dynamic loading force-thermal synchronous measurement device. The infrared\visible light dual-band space positioning mark method comprises the steps of laser grooving array and low-emissivity filler.

[0020] The laser grooving array is processed on the measurement surface by a laser etching process, and the groove shape is a rectangular groove with a length of 200 microns, a width of 100 microns and a depth of 20 microns. The low-emissivity filler material is silver, which is filled in the laser grooving array, so as to manufacture the infrared\visible light dual-band position mark.

[0021] The infrared\visible light dual-band position mark can be directly identified in the visible light picture. When the experimental test piece is impacted and heated, because the infrared emissivity of the low-emissivity filler is lower than that of the test piece, the infrared signal of the infrared\visible light dual-band position mark is weaker than that of the test piece at the same temperature, so that the infrared\visible light dual-band position mark and the test piece form a bright-dark contrast in the infrared picture, and identification and positioning are realized.

[0022] Advantages:

[0023] 1. The application discloses a kind of energetic material dynamic loading force thermal synchronous measurement device, based on multi-array high-speed infrared temperature measurement module, high-speed visible light measurement module, two-way light module and dynamic loading module, temperature field super-resolution measurement is realized by multi-array high-speed infrared temperature measurement module, deformation field measurement is realized by high-speed visible light measurement module, dynamic load is applied to energetic material based on split Hopkinson pressure bar, sapphire window is used as explosive support and observation platform, and then the dynamic ignition process of energetic material is realized Force thermal response synchronous characterization.

[0024] 2, the application discloses a kind of energetic material dynamic loading force thermal synchronous measurement device, the multi-array high-speed infrared temperature measurement module used, based on high-speed infrared detector, infrared light path, infrared lens and high-precision translation stage, microsecond level time resolution measurement can be realized by high-speed infrared detector. A plurality of infrared detectors are simultaneously temperature measured by infrared light system, sub-pixel translation is realized by high-precision translation stage, two high-speed infrared detectors are used for multi-frame image super-resolution by capturing different light fields, and high spatial resolution temperature field super-resolution measurement of energetic material dynamic ignition process is realized.

[0025] 3, the application discloses an infrared\visible light dual-band position marking method, which realizes the marking recognition of light picture by laser etching groove array on the surface of the test piece. The infrared signal of the mark is lower than the test piece at the same temperature by filling low-emissivity material in the groove through additive manufacturing process, forming light and dark contrast, realizing the marking recognition of infrared picture. At the same time, the filling method in the groove can avoid falling off under the impact of low-emissivity material. Through the infrared\visible light dual-band position marking, the spatial synchronization of infrared picture and visible light picture and the hot spot positioning in the dynamic ignition process of energetic material are realized. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The energetic material dynamic loading force thermal synchronous measurement device of the application;

[0027] 1-SHPB incident rod, 2-charged base, 3-sapphire window, 4-sapphire lens, 5-dichroic mirror, 6-high-speed camera, 7-first gold-plated mirror, 8-50 / 50 infrared dichroic mirror, 9-first infrared lens, 10-first high-speed infrared detector chip, 11-first high-speed infrared detector, 12-second gold-plated mirror, 13-second infrared lens, 14-second high-speed infrared detector chip, 15-second high-speed infrared detector. DETAILED DESCRIPTION

[0028] In order to better illustrate the purpose and advantages of the application, the content of the application is further explained below in combination with the drawings and examples.

[0029] Example 1:

[0030] As Figure 1 shown, the dynamic loading force-thermal synchronous measurement device for energetic materials disclosed in the embodiment comprises a SHPB incident rod 1, a charge base 2, a sapphire window 3, a sapphire lens 4, a dichroic mirror 5, a high-speed camera 6, a first gold-coated mirror 7, a 50 / 50 infrared spectroscope 8, a first infrared lens 9, a first high-speed infrared detector chip 10, a first high-speed infrared detector 11, a second gold-coated mirror 12, a second infrared lens 13, a second high-speed infrared detector chip 14, and a second high-speed infrared detector 15.

[0031] The SHPB incident rod 1, the charge base 2, and the sapphire window 3 constitute a dynamic loading device for energetic materials. The SHPB incident rod 1 is used to apply dynamic load to the energetic material sample placed on the sapphire window 3, with a rod diameter of 14 mm, a striker rod length of 300 mm, and an incident rod length of 1200 mm. The charge base 2 is used to install the sapphire window 3 and prevent damage to personnel and equipment caused by the shock wave generated by the energy release of the energetic material. The sapphire window 3 is used to place the sample and allow infrared and visible light to pass to the optical path.

[0032] The sapphire lens 4, the dichroic mirror 5, and the first gold-coated mirror 7 constitute a two-way light splitting module. The sapphire lens 4 is used to receive the infrared and visible light incident on the measurement surface and convert it into parallel light for transmission to the subsequent optical path. The dichroic mirror 5 is inclined at 45° to the optical axis of the sapphire lens 4, reflecting visible light in the 460-760 nm band from the sample light, with a reflectivity of more than 85%, only transmitting infrared light in the 2.5-5.0 μm band, with a transmittance of more than 85%, and less than 10% transmittance for 760 nm-2.5 μm band light. The 7-gold-coated mirror is used to reflect the parallel infrared light transmitted through the dichroic mirror 5 to the infrared measurement module, with an infrared reflectivity of more than 97% in the 2.5-5.0 μm band.

[0033] The high-speed camera 6 is used to acquire visible light pictures during the dynamic loading process of the energetic material, for measuring deformation field information, with a shooting frame rate of 1 MHz and a continuous shooting of 180 frames of pictures.

[0034] The 8-50 / 50 infrared beam splitter, the first infrared lens 9, the first high-speed infrared detector chip 10, the first high-speed infrared detector 11, the second gold-plated reflector 12, the second infrared lens 13, the second high-speed infrared detector chip 14, and the second high-speed infrared detector 15 constitute a multi-array high-speed infrared temperature measurement module. The 8-50 / 50 infrared beam splitter splits the parallel infrared light transmitted from the two-way beam splitter module into two, reflecting the infrared light to the first infrared lens 9, and transmitting the parallel infrared light through the second gold-plated reflector 12 to the second infrared lens 13. The first infrared lens 9 and the second infrared lens 13 focus the parallel infrared light onto the 10-high-speed infrared detector 11 and the second high-speed infrared detector chip 14, respectively, forming the imaging plane. The first high-speed infrared detector 11 and the second high-speed infrared detector 15 are horizontally separated by 0.5 pixel widths (25 μm) relative to the optical axis, thereby acquiring different infrared images with sub-pixel differences for subsequent multi-frame infrared super-resolution.

[0035] according to Figure 1 The overall structural diagram shown illustrates the construction of the experimental platform.

[0036] Based on the dynamic loading force and thermal synchronous measurement device for energetic materials disclosed in this embodiment, the specific implementation steps of the method for synchronously measuring the ignition behavior force and heat of energetic materials are as follows:

[0037] Step 1: Install and adjust the position of sapphire lens 4 so that the optical axis passes through the sample and the focal point of sapphire lens 4 is located on the sample measurement surface. Install and adjust the center of dichroic mirror 5 so that it passes through the optical axis of sapphire lens 4 and is tilted at 45° to the optical axis, with the reflection direction aligned with high-speed camera 6. Install and adjust the gold-plated reflector 7 so that it passes through the optical axis of sapphire lens 4 and is tilted at 45° to the optical axis, with the reflection direction aligned with high-speed infrared measurement module.

[0038] Step 2: Install a micro-aperture at the sample placement position. The diameter of the central hole is 10 micrometers. Use a tungsten filament lamp to emit a parallel beam of light that passes through the micro-aperture into the optical path.

[0039] Step 3: Adjust the position of the high-speed infrared detector using a high-precision translation stage to center the micro-aperture image. Then, adjust the relative positions of the two detectors according to the intensity distribution curve of the point light source in the image, so that the imaging centers of the two detectors differ by 0.5 pixels.

[0040] Step 4: Adjust the position of the visible light camera so that the micro-aperture is imaged at the center of the image.

[0041] Step 5: Replace the microaperture with the sample, bring the end face of the incident rod into contact with the sample, and apply a dynamic load. The strain signal from the incident rod is input to the signal generator, and the signal generator outputs a trigger signal to synchronously trigger the visible light camera and the infrared detector.

[0042] Step six: the system collects visible light camera and infrared image, calculates deformation field and temperature field information, and synchronizes the spatial position of deformation field and temperature field according to the visible light / infrared dual-band mark.

[0043] The above detailed description further illustrates the purpose, technical scheme and beneficial effects of the present application, and it should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for synchronously measuring dynamic loading force and heat of energetic materials, characterized in that: It includes a multi-array high-speed infrared temperature measurement module, a high-speed visible light measurement module, a two-dimensional beam splitting module, and a dynamic loading module for energetic materials; The multi-array high-speed infrared temperature measurement module and the high-speed visible light measurement module are arranged on both sides of the energetic material dynamic loading module; The bidirectional beam splitter is located at the intersection of the observation axis of the high-speed visible light measurement module and the loading axis of the dynamic loading module. The high-speed infrared temperature measurement module includes an infrared optical path and a surface array high-speed infrared detector; the infrared optical path is used to collect and transmit the infrared signals emitted by the object being measured, and is composed of an infrared beam splitter, a reflector, and a lens; the surface array high-speed infrared detector is used to acquire infrared images. The visible light measurement module includes a high-speed camera, a lens, and a laser light; The dichroic beam splitter module is used to transmit the infrared and visible light radiated from the object's surface to the multi-array high-speed infrared thermometry module and the high-speed visible light measurement module, respectively, enabling simultaneous acquisition of infrared and visible light images. The dichroic beam splitter optical module includes a dichroic mirror, an adjustment device, and a reflector. The dichroic mirror reflects visible light in the 460nm–760nm band from the surface of the test piece, with a reflectivity of over 85%; it transmits only infrared light in the 2.5μm–5.0μm band, with a transmittance of over 85%; and transmittance of less than 5% for light in the 760nm–2.5μm band. The dichroic mirror also filters out light interference entering the area-array infrared detector through the optical system. The planar reflector reflects the visible light band reflected by the dichroic mirror to the high-speed camera, with a reflectivity greater than 90%. The energetic material dynamic loading module consists of a separate Hopkinson pressure bar and a charging platform. The charging platform includes an impact base and a sapphire observation window. The impact base is a steel cylinder with a countersunk hole at the bottom for installing the sapphire observation window. The cylinder is horizontally fixed, and the incident rod extends into the cylinder to impact the energetic material sample placed at the position of the observation window. The sapphire observation window and the incident rod together apply a compressive-shear load to the energetic material and transmit the infrared radiation signal through the observation window to the bidirectional beam splitter module.

2. The dynamic loading force and thermal synchronous measurement device for energetic materials as described in claim 1, characterized in that: The multi-array high-speed infrared temperature measurement module includes two area array high-speed infrared detectors, an infrared beam splitter, and a high-precision translation stage; The array-type high-speed infrared detector consists of 64×64 detector elements, with a shooting frame rate of 1MHz, and can continuously capture 100 frames of infrared images. The infrared beam splitter consists of one 50 / 50 infrared beam splitter and two infrared lenses. The 50 / 50 infrared beam splitter splits the infrared radiation signal transmitted by the two-way beam splitter module into two, reflecting the infrared light into the high-speed infrared detector 1 and transmitting the infrared light into the detector 2. The infrared beam transmitted by the two-way beam splitter module is a parallel beam, and the infrared lenses are used to focus the parallel beam onto the detector array to achieve imaging. The high-precision translation stage is used for subpixel-level imaging position adjustment, and two high-speed infrared detectors will capture two light fields with subpixel misalignment.

3. The dynamic loading force and thermal synchronous measurement device for energetic materials as described in claim 2, characterized in that: A beam splitter module is used to achieve synchronous imaging of a high-speed infrared measuring instrument and a visible light camera. An infrared thermometry module measures the temperature rise of energetic materials to achieve spatial synchronization of temperature information. A high-speed visible light module measures the deformation of energetic materials. Multi-array scheme is used to achieve multi-frame infrared super-resolution measurement. Laser etching of micro-holes and filling with low infrared emissivity material are used to create infrared / visible light spatial synchronization positioning marks to achieve spatial synchronization of infrared / visible light images. This enables synchronous measurement of hotspot location, deformation and temperature rise evolution processes of energetic materials under dynamic load.

4. The dynamic loading force and thermal synchronous measurement device for energetic materials as described in claim 3, characterized in that: Multi-frame infrared super-resolution is achieved through sub-pixel biased multi-array and convex set projection algorithms.

5. A dual-band infrared / visible light spatial positioning and marking method, based on a dynamic loading force thermal synchronous measurement device for energetic materials as described in claim 1, 2, 3, or 4, characterized in that: This includes laser grooving arrays and low emissivity filler steps; The laser groove array is processed on the measurement surface by laser etching. The grooves are rectangular grooves with a length of 200μm, a width of 100μm, and a depth of 20μm. They are arranged at equal intervals along the outer edge of the image according to the required image size. The low emissivity filler material is silver, which is filled in the laser groove array to form the infrared / visible dual-band position marker. The infrared / visible dual-band position marker can be directly identified in the visible light image. When the test specimen is subjected to impact and temperature rise, because the infrared emissivity of the low emissivity filler is lower than that of the specimen, the infrared signal of the infrared / visible dual-band position marker is weaker than that of the specimen at the same temperature, so that the infrared / visible dual-band position marker and the specimen form a brightness contrast in the infrared image, thereby realizing identification and positioning.

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