JPS59190666A - Revolution indicator utilizing super-conductive quantum interferometer - Google Patents

Abstract

PURPOSE:To make it possible to measure a rotation number with high accuracy, by measuring a magnetic field generated by the high speed rotation of a copper ring by a super-conductive quantum interferometer. CONSTITUTION:When a copper ring 1 is rotated at a high speed as shown by the arrow 2, the conductive electron in the copper ring 1 obtains an angular motion amount to generate a rotary current 4 and a magnetic field 3 is generated with the generation of the rotary current 4. When the copper ring 1 rotated at a high speed is arranged between two parallel Josephson joints of a super- conductive quantum interferometer, the copper ring performs the same function as a small solenoid. Therefore, the magnitude of the magnetic field 3 generated by the copper ring 1 can be measured by reading the value of a Josephson current B and, by converting said magnitude of the magnetic field 3 to the rotation number of the copper ring 1, the rotation number of the copper ring 1, the rotation number of the copper ring 1 can be determined. Because thus Josephson current is sharply changed by the slight change of the rotation number, the rotation number can be measured with high accuracy.

Description

[Detailed Description of the Invention] This invention relates to a superconducting quantum interferometer (S, Q U I D
) is intended to be used as a tachometer.

This invention will be explained as follows based on the drawings.

First, as shown in Figure 1, the rotating copper ring 1 is exposed to a magnetic field 3.
occurs. The magnitude of this magnetic field 3 is proportional to the number of rotations of the copper ring 1 (FIG. 4). Therefore, by measuring the magnetic field 3, the number of rotations of the copper ring 1 can be determined.

The reason why the copper ring 1 rotating at high speed 2 generates a magnetic field 3 is as follows.

Due to the high speed rotation 2 of the copper ring 1, conduction electrons (free electrons) inside the copper ring gain angular momentum. Obtaining the angular motion n1,
Naturally, a rotating current 4 is generated. Further, as the rotating current 4 is generated, a magnetic field 3 is generated.

When the rotation of the copper ring 1 is stopped, the rotating current 4 disappears, and therefore the magnetic field 3 also disappears.

The magnitude of this magnetic field 3 is measured using a superconducting quantum interferometer (SQUID) as shown in FIG.

Referring to FIG. 2, a rapidly rotating copper ring 1 placed perpendicular to the plane of the paper between two parallel Josephson junctions serves the same purpose as a small solenoid. Therefore,
There is a third difference between the rotation speed of the copper ring 1 and the Josephson current B.
There is periodicity as shown in the figure.

The explanation of FIG. 3 is as follows.

The vertical axis B is the Josephson current. The horizontal axis C is scaled with the magnitude of the magnetic field 3 generated by the rotating copper ring 1. Further, the horizontal axis d is the rotation speed, and the magnitude of the magnetic field 3 on the horizontal axis C is converted into the rotation speed of the copper link 1 from the graph of FIG. By reading the value of the Josephson current B in FIG. 3, the number of rotations of the copper ring 1 can be determined. Therefore, it is used as a tachometer.

The effect of the invention is that the Josephson current changes sharply with a slight change in the rotational speed, so it is effective as a highly accurate tachometer.

[Brief explanation of drawings]

FIG. 1 shows that a rotating current and accompanying magnetic field are generated in a copper ring rotating at high speed. Figure 2 shows a superconducting quantum interferometer (SQU) in which, instead of a small solenoid, a rapidly rotating copper ring is placed perpendicular to the page between two parallel Josephson junctions.
ID). In Figure 3, the vertical axis B is the Josephson current, and the horizontal axis C is the magnetic field (
Based on OmG at point A, +100mG to the right and -1 to the left
There are 11 for every 00m G. ), and the horizontal axis d is the rotation speed. Further, point A is a position where the number of rotations is 0, that is, the magnetic field is also 0. FIG. 4 is a graph showing that there is a proportional relationship between the number of rotations of the copper link and the magnetic field 3 (ie, rotational current 4). ■ Copper link, 2 Rotating the copper ring at high speed in the direction of 2, 3 Magnetic field, 4 Rotating current, 5 Superconductor,
6- Nonconductor, 7 Magnitude of magnetic field 3 or magnitude of rotating current 4, 8 - Number of revolutions per second of copper ring, 9
Proportional graph, A: When the rotation speed is 0, the magnetic field is also 0.
position, B Josephson current, C magnitude of magnetic field 3,
d Number of revolutions per second of copper ring, Patent applicant: Rokuji Kamiri, Figure 1, Figure 2, Figure 3, Figure 4.

Claims (1)

[Claims] In a superconducting quantum interferometer (SQUID), a copper ring (1) rotating at high speed (2) instead of a small solenoid is placed perpendicular to the paper between two parallel Josephson junctions.
). High speed rotation (2) Shining copper ring (1)
produces a magnetic field (3). Therefore, it performs the same role as a small solenoid. The magnitude of the magnetic field (3) generated by the high speed rotation (2) of this copper ring (1) is proportional to the number of rotations of the copper ring (1) (FIG. 4). Therefore, there is a periodicity between the rotation speed of the copper link (1) and the Josephson current as shown in FIG. Using this periodicity, the number of rotations of the copper ring (1) can be determined. Use this as a tachometer.