CN-122017689-A - Diamond quantum sensor

Abstract

The diamond quantum sensor of the invention simultaneously irradiates two kinds of microwaves with different frequencies to sense a magnetic field, and if the frequency difference of the two kinds of microwaves is set as delta f, the delta f is in any range of 0.2MHz less than or equal to delta f less than or equal to 3.0MHz and 3.8MHz less than or equal to delta f less than or equal to 5.4 MHz. Δf may be in any of 0.2 MHz≤Δf≤0.8 MHz, 1.8 MHz≤Δf≤2.8 MHz, and 4.0 MHz≤Δf≤4.8 MHz.

Inventors

• Shan Yeli

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260512

Application Date

20251110

Priority Date

20241112

Claims (2)

1. 1. A diamond quantum sensor is characterized in that, Two kinds of microwaves with different frequencies are irradiated simultaneously to sense the magnetic field, If the frequency difference between the two microwaves is set to be Δf, Δf is equal to 0.2MHz≤Δf≤3.0MHz、 3.8MHz≤Δf≤5.4MHz Any one of which is within the scope of the present invention.
2. 2. The diamond quantum sensor according to claim 1, wherein, If the frequency difference between the two microwaves is set to be Δf, Δf is equal to 0.2MHz≤Δf≤0.8MHz、 1.8MHz≤Δf≤2.8MHz、 4.0MHz≤Δf≤4.8MHz Any one of which is within the scope of the present invention.

Description

Diamond quantum sensor Technical Field The invention relates to a diamond quantum sensor. Background Japanese patent No. 6616342 describes a magnetic field detection device which is composed of diamond having a Nitrogen Vacancy (NV) center and which causes electron spins in the NV center to interact with a magnetic field as a measurement target. The magnetic field detection device of japanese patent 6616342 irradiates microwaves having resonance frequencies of NV centers in 4 directions to the detection element. Disclosure of Invention In order to improve the magnetic field sensitivity of the detection element, the slope of the spectrum of the NV center in 1 direction needs to be increased. For this reason, countermeasures for increasing the power of microwaves are known, but the specification of the generation source of microwaves and the power consumption have problems. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a diamond quantum sensor capable of improving sensitivity. The diamond quantum sensor according to the embodiment of the present invention simultaneously irradiates two kinds of microwaves having different frequencies to sense a magnetic field. If the frequency difference between the two microwaves is set to be Δf, Δf is within any one of the ranges of 0.2MHz and Δf and 3.0MHz and 3.8MHz and Δf and 5.4 MHz. In the diamond quantum sensor, if the frequency difference between the two microwaves is Δf, Δf may be in any of the ranges of 0.2 MHz- Δf-0.8 MHz, 1.8 MHz- Δf-2.8 MHz, and 4.0 MHz- Δf-4.8 MHz. The invention can provide a diamond quantum sensor capable of improving sensitivity. Drawings Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals denote like elements, and in which: Fig. 1 is a block diagram illustrating a diamond quantum sensor according to a comparative example. Fig. 2A is a graph illustrating a photodetection magnetic resonance spectrum detected by the diamond quantum sensor according to the comparative example, the horizontal axis represents the frequency of microwaves, and the vertical axis represents the light emission intensity derived from the signal intensity. Fig. 2B is a graph illustrating a relationship between power and slope improvement ratio of microwaves in the diamond quantum sensor according to the comparative example, wherein the horizontal axis represents power of microwaves and the vertical axis represents slope improvement ratio. Fig. 3 is a block diagram illustrating a diamond quantum sensor according to embodiment 1. Fig. 4 is a diagram illustrating a difference between microwave power and frequency of microwaves used for measurement and a slope and slope improvement ratio of a measured spectrum in the diamond quantum sensor according to embodiment 1. Fig. 5A is a bar graph illustrating the slope improvement ratios of comparative examples 1,2 and 3, the horizontal axis represents comparative examples 1,2 and 3, and the vertical axis represents the slope of the spectrum in comparative examples 2 and 3 as the slope improvement ratio when the slope of the spectrum in comparative example 1 is 1. Fig. 5B is a bar graph illustrating slope improvement ratios of comparative example 1, comparative example 2, example 11, and example 21, the horizontal axis represents comparative example 1, comparative example 2, example 11, and example 21, and the vertical axis represents comparative example 2, example 11, and example 21, in which the slope of the spectrum in comparative example 1 is 1, as the slope improvement ratio. Fig. 6 is a graph illustrating the effect of improving the slope when two types of microwaves having different frequencies are irradiated to the diamond quantum sensor according to embodiment 1, wherein the horizontal axis represents the frequency difference Δf between the two types of microwaves and the vertical axis represents the slope improvement ratio. Detailed Description The specific configuration of the present embodiment will be described below with reference to the drawings. The following description shows preferred embodiments of the present invention, but the scope of the present invention is not limited to the following embodiments. The structures described in this embodiment are not necessarily all necessary as means for solving the problem. The following description and drawings are omitted and simplified as appropriate for clarity of illustration. In the drawings, the same components are denoted by the same reference numerals, and repetitive description thereof will be omitted as necessary. < Summary of the embodiments > The diamond quantum sensor of the present embodiment improves the magnetic field sensitivity by increasing the slope of the photodetection magnetic resonance spectrum. Specifically,