Pressure distribution imaging device based on wide-field optical detection magnetic resonance method

Abstract

A pressure distribution imaging device based on a wide-field optical detection magnetic resonance method comprises an anvil cell device applied to a high-pressure diamond anvil cell, an optical excitation assembly and a fluorescence collection assembly, a DAC pressure cavity is formed in the anvil cell device, nano-diamond containing an NV color center is loaded in the DAC pressure cavity, and the DAC pressure cavity is provided with a microwave antenna. Compared with the prior art, the device has the technical effects that the DAC pressure cavity is arranged on the high-pressure diamond anvil cell and can be used for placing a sample and a pressure calibration material, and the fluorescence excitation and collection unit is used for exciting NV color center fluorescence of the nano-diamond in the laser excitation cavity; therefore, the camera can shoot the pressure distribution of a plurality of nano diamonds, dynamic imaging is realized, and convenience is provided for dynamic detection of the pressure distribution with submicron spatial resolution in a non-hydrostatic pressure environment.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure experimental equipment technology, specifically to a device that integrates optical excitation, fluorescence signal acquisition and photoelectric control functions for imaging the pressure distribution within the pressure chamber of a diamond anvil cell (DAC). Background Technology

[0002] In high-pressure scientific research, the non-hydrostatic environment leads to spatial inhomogeneity in the internal stress distribution and physical properties of materials. Traditional single-point detection techniques (such as ruby ​​fluorescence spectroscopy) suffer from insufficient spatial resolution (on the order of approximately 10 μm) and the inability to acquire pressure field distribution information. Existing pressure imaging devices based on the fluorescence of multiple ruby ​​microspheres mostly employ a point-by-point scanning mode, which suffers from low spatial resolution, complex optical path calibration, and slow scanning speed.

[0003] Therefore, there is an urgent need for a structurally optimized wide-field pressure imaging device to facilitate the dynamic detection of micron-level pressure distribution under non-hydrostatic pressure environments. Utility Model Content

[0004] The technical problem to be solved by this invention is: how to design a wide-field optically detected magnetic resonance (WODRM) pressure distribution imaging device to facilitate the dynamic detection of micron-level pressure distribution under non-hydrostatic pressure environments.

[0005] The specific technical solution of this utility model is as follows:

[0006] A pressure distribution imaging device based on a wide-field optically probed magnetic resonance method includes an anvil cell device for high-pressure diamond anvil cells, an optical excitation component, and a fluorescence collection component. The anvil cell device has a DAC pressure cavity inside, which is loaded with nanodiamond containing NV color centers. The DAC pressure cavity is equipped with a microwave antenna. The optical excitation component includes a laser source, a beam expander lens group, a shaping lens, a dichroic mirror, and a microscope objective connected in sequence. The microscope objective illuminates the DAC pressure cavity of the anvil cell device. The fluorescence collection component includes a microscope objective, a dichroic mirror, a long-pass filter, an imaging lens, and a camera connected in a straight line in sequence. The light emitted from the laser source forms a 90° angle with the optical path of the fluorescence collection component.

[0007] The diameter of the DAC pressure chamber is 300μm.

[0008] It also includes a control component, a controller, which connects the laser source and the microwave antenna.

[0009] The anvil device is equipped with a metal gasket with pre-drilled holes serving as the DAC pressure chamber, which is located within the contour of the DAC anvil surface.

[0010] The dichroic mirror has a reflectivity of >95% for laser light and a transmittance of >90% for fluorescence with wavelengths above 650 μm.

[0011] The camera is a CMOS camera that supports a fluorescence signal acquisition frame rate of 10 fps or higher.

[0012] The beam-expanding lens group consists of a combination of lenses with focal lengths of 100 mm and 200 mm, and the shaping lens is a lens with a focal length of 100 mm. The beam-expanding lens group and the shaping lens are used together to shape the laser under the microscope objective into a uniform spot with a diameter ≥ 500 μm.

[0013] Compared with the prior art, the technical effect of this utility model is that it has a DAC pressure chamber on the high-pressure diamond anvil cell, which can hold samples and pressure calibration materials. The fluorescence excitation and collection unit will use laser to excite the NV center fluorescence of the nanodiamonds in the chamber, so that the camera can capture the pressure distribution of multiple nanodiamonds and realize dynamic imaging, which provides convenience for realizing submicron level spatial resolution dynamic detection of pressure distribution under non-hydrostatic pressure environment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the present invention.

[0015] Figure 2 This is a schematic diagram of the optical path.

[0016] Figure 3 This is a schematic diagram of the DAC pressure chamber. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1-3 A pressure distribution imaging device based on wide-field optical detection magnetic resonance method includes an anvil device 1 applied to a high-pressure diamond anvil cell (DAC), an optical excitation component, and a fluorescence collection component.

[0019] The anvil device 1 is equipped with a DAC pressure chamber 7, which contains nanodiamond 92 containing NV color centers, and a microwave antenna 8.

[0020] The optical excitation assembly includes a laser source 11, a beam expander lens 10, a shaping lens 9, a dichroic mirror 3, and a microscope objective 2 connected in sequence. The microscope objective 2 irradiates the DAC pressure chamber 7 of the anvil device 1 to excite the NV color centers in the nanodiamond in the DAC pressure chamber to generate fluorescence.

[0021] The fluorescence collection assembly includes a microscope objective 2, a dichroic mirror 3, a long-pass filter 4, an imaging lens 5, and a camera 6 connected in a straight line in sequence, for collecting the fluorescence signal generated by the NV color center.

[0022] The light emitted by the laser source 11 forms a 90° angle with the optical path of the fluorescence collection component.

[0023] The diameter of the DAC pressure chamber 7 is 300 μm.

[0024] It also includes a control component, a controller 12, which is connected to the laser source 11 and the microwave antenna 8 and is used to control laser emission and microwave signal output.

[0025] like Figure 3 The anvil device 1 is provided with a metal pad 102, and the metal pad 102 is provided with a DAC pressure cavity 101. The DAC pressure cavity 7 is located within the outline of the DAC anvil surface 8. The microwave antenna 8 adopts a planar linear design to fit the internal space of the DAC pressure cavity of the anvil device (1) and realize the loading of the microwave radiation field.

[0026] To achieve high imaging accuracy, the dichroic mirror 3 has a reflectivity of >95% for laser light and a transmittance of >90% for fluorescence with wavelengths above 650 μm.

[0027] The camera 6 is a complementary metal-oxide-semiconductor (CMOS) camera that supports fluorescence signal acquisition frame rates of 10 fps or higher.

[0028] The beam expander lens group 10 is composed of a combination of lenses with focal lengths of 100 mm and 200 mm, and the shaping lens is a lens with a focal length of 100 mm. The beam expander lens group and the shaping lens are used together to shape the laser under the microscope objective into a uniform spot with a diameter ≥500 μm.

[0029] Its working principle is as follows:

[0030] Specifically, the steps include the following:

[0031] S1. The sample to be studied 91, the nanodiamond containing NV color center 92, and the microwave antenna (23) under high pressure are assembled into the DAC pressure chamber 7 and placed on the displacement stage after being pressurized.

[0032] S2. Control the microwave antenna 8 to apply a sweeping microwave centered at 2.87 GHz into the pressure chamber of the anvil DAC.

[0033] S3. Move the anvil device 1 to the wide-field NV color center pressure imaging optical path: The 532nm laser output from the laser source 11 is expanded into a uniform spot with a diameter ≥500μm by the beam expanding lens group 10 (focal length 100mm+200mm), and after being shaped by the shaping lens 9, it is reflected by the dichroic mirror 3 and directed towards the direction of the microscope objective 2, and finally uniformly excites the DAC pressure cavity 7 in a wide field.

[0034] The nanodiamond 92 at the S4 and NV color centers is stimulated to produce fluorescence. The fluorescence is separated by the dichroic mirror 3 and converged to the camera 7 by the long-pass filter 4 and the imaging lens 5, forming an image.

[0035] Features of this application:

[0036] S1. This utility model discloses a pressure distribution imaging device in a high-pressure diamond anvil cell (DAC) based on the wide-field optically detected magnetic resonance (WODRM) method. It adopts diamond nitrogen-vacancy (NV) color center quantum sensing technology and achieves in-situ submicron level spatial resolution dynamic imaging of pressure distribution in the anvil cell through the wide-field optically detected magnetic resonance method.

[0037] The S2 CMOS camera can capture images of the fluorescence intensity of nanodiamonds inside the DAC pressure chamber and transmit the fluorescence intensity imaging data at different microwave frequencies to the computer 13 for data analysis by the software control and data analysis unit.

[0038] S3. This utility model device breaks through the traditional single-point detection mode and realizes micron-level resolution imaging of non-static water pressure fields under high pressure environment.

[0039] S4, the beam expander lens group, and the shaping lens are used together to expand the laser beam under the microscope objective into a uniform spot with a diameter ≥500μm. After passing through the microscope objective 2, a larger beam is formed, which can cover the entire DAC pressure cavity 7 and maintain the imaging size.

[0040] For other details, please refer to the existing technology.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A pressure distribution imaging device based on a wide-field optical detection magnetic resonance method, comprising an anvil device (1) for use with a high-pressure diamond anvil cell, an optical excitation component, and a fluorescence collection component, characterized in that: The anvil device (1) is equipped with a DAC pressure chamber (7), which contains nanodiamonds (92) with NV color centers. The DAC pressure chamber (7) is equipped with a microwave antenna (8). The optical excitation assembly includes a laser source (11), a beam expander lens group (10), a shaping lens (9), a dichroic mirror (3), and a microscope objective (2) connected in sequence. The microscope objective (2) irradiates the DAC pressure chamber (7) of the anvil device (1). The fluorescence collection assembly includes a microscope objective (2), a dichroic mirror (3), a long-pass filter (4), an imaging lens (5), and a camera (6) connected in a straight line in sequence. The light emitted by the laser source (11) forms a 90° angle with the optical path of the fluorescence collection component.

2. The pressure distribution imaging device based on the wide-field optical detection magnetic resonance method as described in claim 1, characterized in that: The diameter of the DAC pressure chamber (7) is 300 μm.

3. The pressure distribution imaging device based on the wide-field optical detection magnetic resonance method as described in claim 2, characterized in that: It also includes a control component, a controller (12), which connects the laser source (11) to the microwave antenna (8).

4. The pressure distribution imaging device based on the wide-field optical detection magnetic resonance method as described in claim 3, characterized in that: The anvil device (1) is provided with a metal gasket (102), and the metal gasket (102) has a pre-drilled small hole as a DAC pressure chamber (7), which is located within the outline of the DAC anvil surface (101).

5. The pressure distribution imaging device based on the wide-field optical detection magnetic resonance method as described in claim 4, characterized in that: The dichroic mirror (3) has a reflectivity of >95% for laser light and a transmittance of >90% for fluorescence with wavelengths above 650 μm.

6. The pressure distribution imaging device based on the wide-field optical detection magnetic resonance method as described in claim 5, characterized in that: The camera (6) is a CMOS camera that supports a fluorescence signal acquisition frame rate of 10fps or higher.

7. The pressure distribution imaging device based on the wide-field optical detection magnetic resonance method as described in claim 6, characterized in that: The beam-expanding lens group (10) is composed of a combination of lenses with focal lengths of 100mm and 200mm, and the shaping lens is a lens with a focal length of 100mm. The beam-expanding lens group and the shaping lens are used together to shape the laser under the microscope objective into a uniform spot with a diameter ≥500μm.

Images