Magnetism measuring device, gas cell, manufacturing method of magnetism measuring device, and manufacturing method of gas cell

Patent metadata

Field	Value
Publication number	US-10145909-B2
Application number	US-201514933798-A
Country	US
Kind code	B2
Filing date	Nov 5, 2015
Priority date	Nov 17, 2014
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

A magnetism measuring device includes: a gas cell which includes a cell portion that has a main chamber, a reservoir, a communication hole which allows the main chamber and the reservoir to communicate with each other, and an opening provided in the reservoir, a sealing portion which seals the opening, an ampoule disposed in the reservoir, and an alkali metal gas which fills the main chamber and the reservoir. The ampoule is disposed at a predetermined position in the reservoir, and the opening is provided at a position that is distant from the predetermined position.

First claim

What is claimed is:

1. A magnetism measuring device for measuring a magnetic field, comprising:
a gas cell which includes:
a cell portion which has a first chamber, a second chamber, a communication hole which allows the first chamber and the second chamber to communicate with each other;
an ampoule disposed in the second chamber;
an opening in the second chamber through which the ampoule is inserted into the second chamber, the opening having a widest dimension that is smaller than a length of the ampoule in its longitudinal direction;
a sealing portion which seals the opening; and
an alkali metal gas which fills the first chamber and the second chamber,

wherein the ampoule is disposed at a predetermined position in the second chamber, and
the opening is provided at a position that is distant from the predetermined position.

2. The magnetism measuring device according to claim 1 , further comprising:
an inclined surface provided on a bottom portion side of the second chamber,
wherein the predetermined position is the lowermost position in the inclined surface, and
the opening is provided at a position higher than the inclined surface.

3. The magnetism measuring device according to claim 2 ,
wherein the first chamber and the second chamber are arranged along a first direction,
the inclined surface is inclined along a second direction that intersects the first direction,
the longitudinal direction of the ampoule is disposed to follow the first direction, and
the opening is provided at a position that is distant from the predetermined position in the second direction.

4. The magnetism measuring device according to claim 2 ,
wherein the first chamber and the second chamber are arranged along a first direction,
the inclined surface is inclined along the first direction,
the longitudinal direction of the ampoule is disposed to follow a second direction that intersects the first direction, and
the opening is provided at a position that is distant from the predetermined position in the first direction.

5. The magnetism measuring device according to claim 2 ,
wherein the second chamber includes a convex portion formed by the two inclined surfaces which are inclined toward opposite sides to each other in the same direction and thus intersect each other, and
the opening is disposed between a position at which the inclined surfaces intersect each other and the predetermined position in the direction in which the two inclined surfaces are inclined.

6. The magnetism measuring device according to claim 2 ,
wherein the second chamber includes a concave portion formed by the two inclined surfaces which are inclined toward opposite sides to each other in the same direction and thus intersect each other, and
the opening is disposed at a position that is distant from a position at which the inclined surfaces intersect each other in the direction in which the two inclined surfaces are inclined.

7. The magnetism measuring device according to claim 1 ,
wherein the communication hole is provided at a position that is distant from the predetermined position.

8. The magnetism measuring device according to claim 7 ,
wherein the communication hole is provided at a position higher than the predetermined position.

9. A magnetism measuring device for measuring a magnetic field, comprising:
a gas cell which includes:
a cell portion which has a first chamber, a second chamber, and a communication hole which allows the first chamber and the second chamber to communicate with each other;
an ampoule disposed in the second chamber;
an opening in the second chamber through which the ampoule is inserted into the second chamber, the opening having a widest dimension that is smaller than a length of the ampoule in its longitudinal direction; and
an alkali metal gas which fills the first chamber and the second chamber,

wherein the second chamber is provided with a predetermined position in which the ampoule is settled, and
a plurality of through-holes are formed in the ampoule.

10. A gas cell comprising:
a cell portion which includes a first chamber, a second chamber, a communication hole which allows the first chamber and the second chamber to communicate with each other;
an ampoule disposed in the second chamber;
an opening in the second chamber through which the ampoule is inserted into the second chamber, the opening having a widest dimension that is smaller than a length of the ampoule in its longitudinal direction;
a sealing portion which seals the opening; and
an alkali metal gas which fills the first chamber and the second chamber,
wherein the ampoule is disposed at a predetermined position in the second chamber, and
the opening is provided at a position that is distant from the predetermined position.

11. A manufacturing method of a magnetism measuring device for measuring a magnetic field, the manufacturing method comprising:
inserting an ampoule filled with an alkali metal material into a second chamber of a cell portion through an opening in the second chamber, the cell portion including a first chamber, the second chamber, and a communication hole which allows the first chamber and the second chamber to communicate with each other;
sealing the opening with a sealing portion; and
forming a through-hole in the ampoule by irradiating the ampoule with laser light,
wherein the opening has a widest dimension that is smaller than a length of the ampoule in its longitudinal direction,
after insertion of the ampoule, the ampoule is disposed at a predetermined position in the second chamber, and
the opening is provided at a position that is distant from the predetermined position.

12. A manufacturing method of a magnetism measuring device for measuring a magnetic field, the manufacturing method comprising:
inserting an ampoule filled with an alkali metal material into a second chamber of a gas cell through an opening in the second chamber, the gas cell including a first chamber, the second chamber, and a communication hole which allows the first chamber and the second chamber to communicate with each other;
sealing the first chamber, the second chamber, and the communication hole; and
forming a through-hole in the ampoule by irradiating the ampoule with laser light,
wherein the opening has a widest dimension that is smaller than a length of the ampoule in its longitudinal direction,
the second chamber is provided with a predetermined position in which the ampoule is settled, and
in the forming of the through-hole, a plurality of spots of the ampoule are irradiated with the laser light with respect to the predetermined position.

13. The manufacturing method of a magnetism measuring device according to claim 12 ,
wherein the predetermined position is provided along a first direction,
the ampoule is disposed at the predetermined position so that its longitudinal direction follows the first direction, and
in the forming of the through-hole, the plurality of spots are irradiated with the laser light along the first direction.

14. The manufacturing method of a magnetism measuring device according to claim 13 ,
wherein, in the forming of the through-hole, the laser light is emitted along the first direction while performing scanning.

15. The manufacturing method of a magnetism measuring device according to claim 14 ,
wherein, in the forming of the through-hole, the laser light is allowed to perform scanning by using a galvanometer scanner.

16. The manufacturing method of a magnetism measuring device according to claim 14 ,
wherein, in the forming

Assignees

• Seiko Epson Corp

Inventors

• Fujii Eiichi

Classifications

• F17C3/00

  Vessels not under pressure · CPC title

• G01R33/26 Primary

  using optical pumping · CPC title