MAGNETISM MEASURING DEVICE

• US 20160174867A1
• Filed: 12/15/2015
• Published: 06/23/2016
• Est. Priority Date: 12/17/2014
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: HATANO, Yuji, UENO, Jun, OKITAKA, Takenori, KOMATSU, Keiro
• Granted Patent: US 10,379,069 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 5/05 Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves impedance plethysmography A61B5/0295; measuring movement of the entire body or parts thereof A61B5/11; detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof A61B5/24
• CPC Class Codes: G01N 24/10 by using electron paramagnetic resonance G01N24/12 takes precedence
• CPC Class Codes: G01R 33/24 for measuring direction or magnitude of magnetic fields or magnetic flux
• CPC Class Codes: G01R 33/60 using electron paramagnetic resonance G01R33/24, G01R33/62 take precedence

Abstract

A magnetism measuring device includes a light source unit, a diamond crystal and an image sensor. The light source unit irradiates the diamond crystal with an excitation light, and irradiates the image sensor with a fluorescent light generated by the diamond crystal. The diamond crystal includes a plurality of nitrogen-vacancy pairs. The image sensor detects an intensity of the fluorescent light, which is generated from the diamond crystal, by a plurality of pixels. The image sensor and the light source unit are disposed so as to be contained within a projection area of the diamond crystal.

Claims

1. A magnetism measuring device comprising:

a diamond crystal having a plurality of nitrogen-vacancy pairs;

an image sensor which detects an intensity of a fluorescent light emitted from the diamond crystal by a plurality of pixels; and

a light source unit which irradiates the diamond crystal with an excitation light and irradiates the image sensor with the fluorescent light emitted from the diamond crystal,

wherein the image sensor and the light source unit are disposed so as to be contained within a projection area of the diamond crystal.

2. The magnetism measuring device according to claim 1, further comprising:

a microwave unit which irradiates the diamond crystal with a microwave;

a signal processing unit which processes a fluorescent image received by the image sensor; and

a control unit which controls operations of the light source unit, the microwave unit and the signal processing unit,

wherein the microwave unit, the signal processing unit and the control unit are disposed so as to be contained within the projection area of the diamond crystal.

3. The magnetism measuring device according to claim 2, wherein the light source unit includes:

a light source which outputs an excitation light;

a first lens which collects the excitation light output from the light source;

a mirror unit which separates the excitation light and the fluorescent light;

a second lens which magnifies the excitation light separated by the mirror unit and irradiates the diamond crystal with the excitation light, and collects the fluorescent light emitted from the diamond crystal; and

a third lens which collects the fluorescent light separated by the mirror unit and irradiates the image sensor with the fluorescent light.

4. The magnetism measuring device according to claim 3,

wherein a magnification of the second lens is set so as to make an area ratio between the image sensor and the diamond crystal be 1:

n.

5. The magnetism measuring device according to claim 1,

wherein the light source unit is made up of a light source chip which irradiates the diamond crystal with an excitation light, and

wherein the light source chip includes:

a plurality of light emitting units which are formed in an array shape and emit an excitation light; and

a through light path which is formed in the array shape between the respective light emitting units and transmits the fluorescent light emitted from the diamond crystal.

6. The magnetism measuring device according to claim 5,

wherein a first distance corresponding to a gap between adjacent light emitting units is almost equal to a second distance corresponding to a gap between the light source chip and the diamond crystal.

7. The magnetism measuring device according to claim 5, further comprising:

a microwave unit which irradiates the diamond crystal with a microwave;

a signal processing unit which processes a fluorescent image received by the image sensor; and

a control unit which controls operations of the light source unit, the microwave unit and the signal processing unit,

wherein the microwave unit, the signal processing unit and the control unit are disposed so as to be contained within the projection area of the diamond crystal.

8. The magnetism measuring device according to claim 1,

wherein the light source unit includes a fourth lens which magnifies an excitation light emitted from outside to irradiate the diamond crystal with the excitation light, and

wherein the fourth lens is disposed so as to be contained within the projection area of the diamond crystal.