Large-scale magnetic suspension detection method and device based on magnet arrays

A technology of a magnet array and a detection method, which is applied to measurement devices, specific gravity measurement, instruments, etc., can solve the problems of cumbersome preparation process of large-size magnets, blocking the development of magnetic levitation detection technology, expensive and dangerous, etc., and achieves a wide range of detectable densities, Simple structure and high detection accuracy

Pending Publication Date: 2021-08-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the size of the magnet, magnetic levitation detection can only detect small-volume substances, while the preparation process of large-size magnets is cumbersome, expensive and dangerous
Therefore, the size limitation of the detected substance has always been an obstacle to the development of magnetic levitation detection technology.

Method used

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  • Large-scale magnetic suspension detection method and device based on magnet arrays
  • Large-scale magnetic suspension detection method and device based on magnet arrays
  • Large-scale magnetic suspension detection method and device based on magnet arrays

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] use figure 1 The device shown is used to measure the density of a polymer with unknown density. The experiment selects a 2M (mol / L) manganese chloride aqueous solution, and the density ρ m 1.196g / cm 3 , magnetic susceptibility χ m is 3.63×10 -4 .

[0063] Eight NdFeB permanent magnets are used to form a set of magnet arrays. The size of each small magnet is 40mm*40mm*20mm. Two sets of magnet arrays are spliced ​​together. The distance between the two sets of magnet arrays is 40mm.

[0064] 1. Density detection of small-sized substances

[0065] The same batch of PLA pellets was selected, with a maximum size of about 5 mm. Use alcohol to clean its surface, place it in the MnCl that has been configured to hold 2M (mol / L) 2 In the transparent container of the aqueous solution, after the suspension is stable, use the camera to suspend the height and measure it. Using other PLA pellets from the same batch, the experiment was repeated 5 times, and the suspension height...

Embodiment 2

[0077] Such as figure 1 As shown, a large-scale magnetic levitation detection device based on a magnet array includes two groups of magnet arrays 4 with opposite poles that are arranged up and down, an outer frame 1 that constrains the magnet array 4, and a transparent container that a paramagnetic medium is housed (in the figure not shown).

[0078] The two magnet arrays 4 are coaxially arranged, and the gravitational fields are aligned up and down. Each group of magnet arrays 4 is composed of eight square magnets, and is detachably installed on the outer frame 1 by the iron plate 5 and the receiver 3 working together. The transparent container is placed between two sets of magnet arrays 4 . A camera is also provided at the corresponding position of the transparent container to record the suspension height of the detected substance. The camera is set separately, just adjust the proper recording position during work.

[0079] During installation, first magnetize the magnet...

Embodiment 3

[0082] A large-scale magnetic levitation detection device based on a magnet array, including two sets of magnet arrays 9 with opposite poles arranged up and down, a transparent container (not shown in the figure) between the two magnet arrays 9 and a paramagnetic medium is housed ), respectively fix the upper iron plate 11 and the lower iron plate 12 of the upper and lower two corresponding magnet arrays 9, the top plate 7 above the upper iron plate 11, the adjusting screw threaded with the top plate 7 and the lower end fixedly connected with the upper iron plate 11 6.

[0083] The top plate 7 is fixedly connected with the lower iron plate 12 through the guide rods 8 arranged at its four corners, and the upper iron plate 11 is slidably connected with the four guide rods 8 respectively. During installation, fix the magnetized magnets on the corresponding iron plates (upper iron plate 11 or lower iron plate 12) with screws to form a magnet array 9. This embodiment adopts a singl...

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Abstract

The invention provides a large-scale magnetic suspension detection method and device based on magnet arrays. The detection method comprises the steps: constructing two groups of magnet arrays of which same poles are oppositely arranged; placing a diamagnetic sample in a container filled with a paramagnetic medium between the two groups of magnet arrays; after the diamagnetic sample suspends stably, measuring the suspension height of the diamagnetic sample; and determining a density calculation formula through a calibration experiment, and then obtaining the density of the diamagnetic sample through calculation. According to the detection method disclosed by the invention, the diamagnetic sample is detected in the form of the magnet arrays instead of large-size magnets, so that the density detection of the large-size sample is realized, and the detection precision is high; and the size of the magnet arrays can be adjusted according to the size of a sample to be detected, paramagnetic media with different densities can be replaced, the applicability is high, and the detectable density range is wide. The detection device comprises two groups of magnet arrays and a transparent container, wherein the same poles of the two groups of magnet arrays are arranged oppositely, and the transparent container is arranged between the two groups of magnet arrays and is filled with the paramagnetic media.

Description

technical field [0001] The invention belongs to the technical field of detection devices, and in particular relates to a large-scale magnetic levitation detection method and device based on a magnet array. Background technique [0002] Density measurement is an important and important link in scientific research and actual production. Physical or chemical changes in substances are often accompanied by changes in density, so density can often be used to judge whether a substance has changed. The magnetic levitation detection technology based on the Archimedes principle is a nondestructive measurement method proposed by Professor Whitesides of Harvard University (Advanced Materials, 2015, 27, 1587–1592). The magnetic levitation detection technology is easy to operate, fast and accurate, and can realize non-destructive detection of material density in a short time. [0003] The standard magnetic levitation detection device consists of two magnets facing each other with the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/00
CPCG01N9/00
Inventor 赵朋贾宇寒颉俊王庭瑜章卫泽傅建中
Owner ZHEJIANG UNIV
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