1. A single-phase optical current transformer comprising:
a cylindrical container;
an electric conductor being arranged inside the cylindrical container; and
a Faraday-effect element being provided on the cylindrical container;
the Faraday-effect element having two optical fibers and a mirror, each of the optical fibers being provided outside the cylindrical container, the optical fibers forming a first optical path and a second optical path respectively, each of the optical paths being provided outside the cylindrical container, each of the optical paths being placed so as to intersect with the axial direction of the electric conductor, the optical paths being maintained parallel to each other at a predetermined interval, the second optical path being provided farther from an axis of the electric conductor than the first optical path, the mirror being provided at a respective end surface of each of the optical fibers, the mirror reflecting linearly polarized light, wherein:
linearly polarized lights from the same light source are injected respectively into the optical paths formed outside the cylindrical container, and the current flowing through the electric conductor is measured based on each of the Faraday rotation angles of the linearly polarized lights which are reflected by the mirror,
a first linearly polarized light from the light source is injected into the first optical path and reflected by the mirror such that the first linearly polarized light returns along the first optical path, and
a second linearly polarized light from the light source is injected into the second optical path and reflected by the mirror such that the second linearly polarized light returns along the second optical path.
2. A single-phase optical current transformer comprising:
a cylindrical container;
an electric conductor being arranged inside the cylindrical container;
a Faraday-effect element being provided on the cylindrical container;
an installation base being secured to a part of the outer peripheral surface of the cylindrical container; and
a case being detachably secured to the installation base, the case storing the Faraday-effect element therein;
the Faraday-effect element having two optical fibers and two mirrors, each of the optical fibers being provided outside the cylindrical container, the optical fibers forming a first optical path and a second optical path respectively, each of the optical paths being provided outside the cylindrical container, each of the optical paths being placed so as to intersect with the axial direction of the electric conductor, the optical paths being maintained parallel to each other at a predetermined interval, the second optical path being farther from an axis of the electric conductor than the first optical path, each of the mirrors reflecting linearly polarized light, wherein:
linearly polarized lights from the same light source are injected respectively into the optical paths formed outside the cylindrical container, and the current flowing through the electric conductor is measured based on each of the Faraday rotation angles of the linearly polarized lights which are reflected respectively by the mirrors,
a first linearly polarized light from the light source is injected into the first optical path and reflected by a first one of the mirrors such that the first linearly polarized light returns along the first optical path, and
a second linearly polarized light from the light source is injected into the second optical path and reflected by a second one of the mirrors such that the second linearly polarized light returns along the second optical path.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1.-55. (canceled)
56. A method for preventing the unauthorized removal of a portable electronic device, comprising:
securing a remote unit to a portable electronic device; and
using a base unit that is separated from the remote unit, and the remote unit, to indicate the unauthorized removal of the portable electronic device.
57. The method of claim 56 wherein the remote unit is secured via a security slot associated with the portable electronic device.
58. The method of claim 56 wherein the portable electronic device is a computer.
59. The method of claim 56 wherein the base unit and the remote unit form a proximity detection system, and wherein the unauthorized removal of the portable electronic device is indicated if the remote unit fails to receive a periodic transmission from the base unit.
60. The method of claim 56 wherein the base unit and the remote unit form a proximity detection system, and wherein the unauthorized removal of the portable electronic device is indicated if the remote unit and the base unit are no longer in communication.
61. The method of claim 60 wherein the portable electronic device is a computer.
62. The method of claim 56 wherein the remote unit includes a receiver or a transmitter.
63. The method of claim 56 wherein the remote unit includes a receiver and a transmitter.
64. The method of claim 56 wherein the remote unit is coupled to the portable electronic device with a T-bar.
65. The method of claim 56 wherein an attachment mechanism is used to couple the portable electronic device to the remote unit, and wherein the attachment mechanism includes a pin.
66. A proximity detection system for inhibiting theft of a portable electronic device, the system comprising:
a remote unit;
a base unit; and
an attachment mechanism coupling the remote unit to the portable electronic device;
wherein the base unit and the remote unit are separated from each other and operate together to indicate the unauthorized removal of the portable electronic device.
67. The system of claim 66 wherein a unique ID code is transmitted between the base unit and the remote unit when the proximity detection system is used.
68. The system of claim 66 wherein the attachment mechanism comprises a shaft and a crossmember at an end of the shaft.
69. The system of claim 66 wherein attachment mechanism comprises a member that is capable of rotating between a locked position and an unlocked position.
70. The system of claim 66 wherein the base unit is capable of periodically transmitting a signal to the remote unit.
71. The system of claim 66 further wherein the attachment mechanism comprises a key-actuated lock mechanism.
72. The system of claim 66 wherein the remote unit comprises a siren.
73. The system of claim 66 wherein the remote unit comprises a transmitter.
74. The system of claim 66 wherein the remote unit is capable of activating a siren if the unauthorized removal of the portable electronic device has taken place.
75. The system of claim 66 further comprising the portable electronic device.