CN-122017002-A - Magnetic flux leakage detection device based on minimum sampling period

Abstract

The invention relates to a magnetic flux leakage detection device based on a minimum sampling period, which comprises a magnetizer, a diamond block containing an NV color center, a laser module, a microwave module, a photoelectric detector, a data acquisition module, a data processing module and a main control module. The data acquisition module is used for sampling according to the minimum sampling period, at least one group of paired magnetic characterization frequencies are acquired in the period, the total sampling times are more than or equal to 3 times, the data processing module is used for calculating the microwave center frequency of temperature drift inhibition through the paired frequencies, and the rest sampling data and the center frequency are subjected to difference to obtain magnetic field noise reduction characterization data. The device has the advantages that the temperature drift inhibition effect is maintained, the magnetic measurement sampling rate and the detection speed are greatly improved, the signal acquisition precision is optimized, the magnetic leakage sensing capability is enhanced, the device is suitable for detecting various objects to be detected such as a plane, a circumferential surface and the like, the difficulty in realizing software and hardware is low, and the detection efficiency and universality are good.

Inventors

• FAN HUALIN
• XIAO JIUHUA
• Bi ting
• WANG PENG
• TONG XIAOFENG
• ZHAO JIHONG
• ZHANG SHAOCHUN
• ZHOU MENGLIANG
• SHI HONGBING
• HU KONGYOU
• CHENG JIANGHUI
• MO CHENGSHENG
• XIA ZHI
• WU QIBING

Assignees

• 安徽省特种设备检测院
• 安徽省国盛量子科技有限公司

Dates

Publication Date

20260512

Application Date

20260326

Claims (10)

1. 1. The magnetic flux leakage detection device based on the minimum sampling period comprises a magnetizer, a diamond block, a photoelectric detector and a light source, and is characterized by further comprising a data acquisition module, a data processing module and a main control module, wherein a signal acquisition end of the photoelectric detector is opposite to a fluorescence output surface of the diamond block, the data acquisition module, the data processing module and the main control module are electrically connected in sequence, the diamond block contains an NV color center, two paired magnetic characterization frequencies of the NV color center are set to be two selectable data sampling points, the data acquisition module is used for sampling analog data and is configured to repeatedly sample the data sampling points according to the minimum sampling period, in each minimum sampling period, at least one paired magnetic characterization frequency is obtained through sampling, the total sampling frequency is not lower than three times, the data processing module is used for independently operating sampling data obtained in each minimum sampling period, the independent operation process comprises the steps of calculating a microwave center frequency for restraining temperature drift by using one paired magnetic characterization frequency, sequentially obtaining the other microwave center data and taking the difference and the difference value as the minimum magnetic field characterization data in the minimum sampling period.
2. 2. The magnetic flux leakage detection device based on the minimum sampling period according to claim 1, further comprising a microwave module and a phase-locked amplifier, wherein the microwave module is used for outputting frequency modulation microwaves, a microwave radiation end of the microwave module is arranged close to the periphery of the diamond block, and the phase-locked amplifier is positioned in the main control module and used for data demodulation.
3. 3. The magnetic flux leakage detection device based on the minimum sampling period according to claim 1, further comprising a frequency tracking module, located inside the main control module, wherein the frequency tracking module is used for locking the microwave frequency output by the microwave module to the spin resonance frequency of the NV color center.
4. 4. The leakage flux detection device based on the minimum sampling period according to claim 1, wherein the data acquisition module alternately samples two data sampling points in turn, and defines a sampling period, the duration of the minimum sampling period is not greater than a preset time T, and the temperature change amplitude of the non-active heating environment within the preset time is not greater than 0.1K.
5. 5. The minimum sampling period-based magnetic flux leakage detection device according to claim 1, wherein the set of paired magnetic characterization frequencies for obtaining the microwave center frequency for suppressing temperature drift is the first two sampling data in each minimum sampling period, and the subsequent sampling data in the same minimum sampling period is synchronized with the difference between the microwave center frequency at the end of the acquisition to obtain the magnetic field noise reduction characterization data.
6. 6. The minimum sampling period based magnetic flux leakage detection device of claim 5, wherein the sampling points selected from the beginning of the second sampling to the end of the sampling are the same in each minimum sampling period.
7. 7. The minimum sampling period-based magnetic leakage detection device according to claim 1, wherein the magnetic characterization frequency is a resonance frequency of an NV color center spin or a corresponding microwave frequency at a maximum slope point on an ODMR spectrum.
8. 8. The minimum sampling period based magnetic leakage detection apparatus according to claim 1, further comprising a magnetic concentrator for concentrating the magnetic leakage field, wherein the diamond block is positioned within the magnetic concentrator.
9. 9. The minimum sampling period based magnetic leakage detection device of claim 8, wherein the magnetic focusing direction of the magnetic focusing device is parallel to the NV color axis.
10. 10. The minimum sampling period-based magnetic flux leakage detection device according to claim 1, wherein the magnetic flux collector is an annular magnetic flux collector with a magnetic flux collecting gap.

Description

Magnetic flux leakage detection device based on minimum sampling period Technical Field The invention belongs to the technical field of magnetic leakage detection, and particularly relates to a magnetic leakage detection device based on a minimum sampling period. Background In recent years, research and application of a solid-state spin color center system in the field of quantum precision detection are rapid, wherein a diamond nitrogen-vacancy (NV) color center has stable quantum spin characteristic at room temperature, and becomes a core carrier for magnetic field precision sensing, and a diamond NV color center sensing method based on a photo-detection magnetic resonance (ODMR) technology is widely applied to high-sensitivity measurement of a magnetic field, so that a brand-new technical path is provided for magnetic leakage detection in the field of nondestructive detection. The magnetic leakage detection is used as an important branch of nondestructive detection, defect identification and state evaluation are realized by detecting magnetic field signals leaked from defects of ferromagnetic objects to be detected, the magnetic leakage detection has irreplaceable functions in the fields of industrial manufacture, equipment operation and maintenance and the like, and the diamond NV color center quantum sensing technology is combined with the magnetic leakage detection, so that the sensitivity bottleneck of the traditional magnetic leakage detection can be broken through, and the accurate detection of micro-nano defects is realized. The core of the diamond NV color center magnetic field sensing based on the ODMR technology is to realize magnetic field quantification by utilizing the linear correlation between an external magnetic field and the NV color center spin resonance frequency, and the ground state energy level of the magnetic field quantificationThe difference value of the set of frequencies is positively correlated with an external magnetic field, and the problem of spin resonance frequency drift caused by temperature change can be effectively restrained, so that the method becomes a key means for eliminating temperature errors and calculating magnetic field values in the prior art. However, the traditional data processing method has the obvious technical defects that two resonance frequencies which are paired left and right are required to be acquired respectively, and an effective magnetic field value can be calculated through one-time double-point sampling, so that the magnetic field sampling rate is only half of the frequency sampling rate, and the speed and the bandwidth of magnetic field measurement are greatly limited. In the scenes of rapid defect screening on an industrial production line, real-time nondestructive monitoring of high-speed running equipment and the like, the requirements on the speed and dynamic response capability of magnetic leakage detection are extremely high, the low magnetic field sampling rate cannot meet the rapid and accurate measurement requirements, and the method becomes a core technical barrier for large-scale application of the diamond NV color center quantum sensing technology in the field of magnetic leakage detection. Meanwhile, the traditional magnetic leakage detection magnetizing device is easy to generate magnetic field interference on the sensing probe, part of magnetic leakage signals at the defect of an object to be detected are weak and are easy to be influenced by an environmental magnetic field, detection efficiency and accuracy are further reduced, and the conventional ODMR signal detection mode also has the problems of high noise, low resonance frequency capturing efficiency and the like, and is difficult to match with the measurement accuracy requirement under a high sampling rate. Therefore, on the premise of keeping the temperature inhibition effect and guaranteeing the measurement accuracy, the magnetic field sampling rate of the diamond NV color center sensing structure is improved, and meanwhile, the magnetic excitation, magnetic aggregation and signal detection links of magnetic leakage detection are optimized, so that the method becomes a key research direction for pushing the quantum sensing technology to be practically used in the field of nondestructive detection. The patent number CN119023703A discloses a nondestructive testing method and a magnetic leakage detection device based on a minimum sampling period, and the method designs a double working mode of quick checking and fine imaging by matching a diamond NV color center capable of generating a wide-field fluorescent signal with a wide-field camera for sensing, quickly screens a non-defective area through quick checking electric signals of averaging/extremum, switches a suspected defective area to a two-dimensional imaging mode to acquire a defect form, and realizes the combination of the quick detection of the wide field and the accurate imaging of the defect, thereby solving t